CASE CX31B MINI EXCAVATOR Service Repair Manual Instant Download

1
HYDRAULIC EXCAVATOR
SHOP MANUAL
CX31B CX36B
model
INDEX
1 SPECIFICATIONS
2 MAINTENANCE
3 SYSTEM
4 DISASSEMBLING
5 TROUBLESHOOTING
6 ENGINE
7 INSTALLATION PROCEDURES FOR OPTIONAL ATTACHMENT
8 SUPPORTING DATA
No. 9-91741 EN
Printed by Studio ti - 53104 - 2004.12
2
SAFETY PRECAUTIONS
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SAFETY PRECAUTIONS

• alert against possible damage to the machine and
  its components and is represented as fol- lows
• SCAUTION
• It is very difficult to forecast every danger
  that may occur during operation. However, safety
  can be en- sured by fully understanding proper
  operating pro- cedures for this machine
  according to methods recommended by
  Manufacturer.
• While operating the machine, be sure to perform
  work with great care, so as not to damage the
  ma- chine, or allow accidents to occur.
• Continue studying the manual until all Safety,
  Oper- ation and Maintenance procedures are
  completely understood by all persons working
  with the ma- chine.

GENERAL SAFETY INFORMATION
SWARNING Do not operate or perform any
maintenance on this machine until all
instructions found in the OPERA- TION
MAINTENANCE MANUAL have been thor- oughly read
and understood. Improper operation or maintenance
of this machine may cause accidents and could
result in serious in- jury or death. Always keep
the manual in storage. If it is missing or
damaged, place an order with an authorized our
Distributor for a replacement. If you have any
questions, please consult an au- thorized our
Distributor.

1. Most accidents, which occur during operation, are
   due to neglect of precautionary measures and
   safe- ty rules. Sufficient care should be taken
   to avoid these accidents. Erroneous operation,
   lubrication or maintenance services are very
   dangerous and may cause injury or death of
   personnel. Therefore all precautionary measures,
   NOTES, DANGERS, WARNINGS and CAUTIONS contained
   in the man- ual and on the machine should be
   read and under- stood by all personnel before
   starting any work with or on the machine.
2. Operation, inspection, and maintenance should be
   carefully carried out, and safety must be given
   the first priority. Messages of safety are
   indicated with marks. The safety information
   contained in the manual is intended only to
   supplement safety codes, insurance requirements,
   local laws, rules and regulations.

• Messages of safety appear in the manual and on
  the machine All messages of safety are
  identified by either word of "DANGER", "WARNING"
  and "CAUTION".
• DANGER- Indicates an imminently hazardous
  situation which, if not avoided, will result in
  death or serious injury and is represented as
  follows
• SDANGER
• WARNING- Indicates a potentially hazardous
  situation which, if not avoided, could result in
  death or serious injury and is represented as
  follows
• SWARNING
• CAUTION- Indicates a potentially hazardous
  situation which, if not avoided, may result in
  mi- nor or moderate injury. It may also be used
  to

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SAFETY PRECAUTIONS
SAFETY PRECAUTIONS
SWARNING Do not operate this machine unless you
have read and understand the instructions in the
OPERATORS MANUAL. Improper machine operation
is dangerous and could result in in- jury or
death.
SWARNING The proper and safe lubrication and
maintenance for this machine, recommended by
Manufacturer, are outlined in the OPERATORS
MANUAL for the machine. Improper performance of
lubrication or mainte- nance procedures are
dangerous and could result in injury or death.
Read and understand the MAN- UAL before
performing any lubrication or mainte- nance.

1. Relieve all pressure in air, oil or water systems
   be- fore any lines, fittings or related items
   are discon- nected or removed. Always make sure
   all raised components are blocked correctly and
   be alert for possible pressure when
   disconnecting any device from a system that
   utilizes pressure.
2. Lower the bucket, dozer, or other attachments to
   the ground before performing any work on the ma-
   chine. If this cannot be done, make sure the
   buck- et, dozer, ripper or other attachment is
   blocked correctly to prevent it from dropping
   unexpectedly.

The serviceman or mechanic may be unfamiliar with
many of the systems on this machine. This makes
it important to use caution when perform- ing
service work. A knowledge of the system and or
components is important before the removal or
dis- assembly of any component. Because of the
size of some of the machine compo- nents, the
serviceman or mechanic should check the weights
noted in this manual. Use proper lifting proce-
dures when removing any components. Weight of com-

1. Use steps and grab handles when mounting or
   dismounting a machine. Clean any mud or debris
   from steps, walkways or work platforms before
   us- ing. Always face to the machine when using
   steps, ladders and walkways. When it is not pos-
   sible to use the designed access system, provide
   ladders, scaffolds, or work platforms to perform
   safe repair operations.
2. To avoid back injury, use a hoist when lifting
   com- ponents which weigh 20 kg (45 lbs) or more.
   Make sure all chains, hooks, slings, etc., are
   in good condition and are the correct capacity.
   Be sure hooks are positioned correctly. Lifting
   eyes are not to be side loaded during a lifting
   operation.

ponents table is shown in the section
SPECIFICATIONS. The following is a list of basic
precautions that must al- ways be observed.

1. Read and understand all Warning plates and de-
   cal on the machine before Operating, Maintaining
   or Repairing this machine.
2. Always wear protective glasses and protective
   shoes when working around machines. In partic-
   ular, wear protective glasses when using ham-
   mers, punches or drifts on any part of the
   machine or attachments. Use welders gloves,
   hood/gog- gles, apron and the protective
   clothing appropriate to the welding job being
   performed. Do not wear loose fitting or torn
   clothing. Remove all rings from fingers, loose
   jewelry, confine long hair and loose clothing
   before working on this machinery.
3. Disconnect the battery and hang a "Do Not Oper-
   ate" tag in the Operators Compartment. Remove
   ignition keys.
4. If possible, make all repairs with the machine
   parked on a level, hard surface. Block the ma-
   chine so it does not roll while working on or
   under the machine. Hang a "Do Not Operate" tag
   in the Operators Compartment.
5. Do not work on any machine that is supported only
   by lift, jacks or a hoist. Always use blocks or
   jack stands, capable of supporting the machine,
   before

1. To avoid burns, be alert for hot parts on
   machines which have just been stopped and hot
   fluids in lines, tubes and compartments.
2. Be careful when removing cover plates. Gradually
   back off the last two capscrews or nuts located
   at opposite ends of the cover or device and
   carefully pry cover loose to relieve any spring
   or other pres- sure, before removing the last
   two capscrews or nuts completely.
3. Be careful when removing filler caps, breathers
   and plugs on the machine. Hold a rag over the
   cap or plug to prevent being sprayed or splashed
   by liquids under pressure. The danger is even
   greater if the machine has just been stopped be-
   cause fluids can be hot.
4. Always use the proper tools that are in good con-
   dition and that are suited for the job at hand.
   Be

performing any disassembly.
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SAFETY PRECAUTIONS

• sure you understand how to use them before per-
  forming any service work.
• Reinstall all fasteners with the same part
  number. Do not use a lesser quality fastener if
  replace- ments are necessary.
• Repairs which require welding should be per-
  formed only with the benefit of the appropriate
  ref- erence information and by personnel
  adequately trained and knowledgeable in
  welding proce- dures. Determine type of metal
  being welded and select correct welding
  procedure and electrodes, rods or wire to
  provide a weld metal strength equivalent at
  least to that of the parent metal. Make sure to
  disconnect battery before any weld- ing
  procedures are attempted.
• Do not damage wiring during removal operations.
  Reinstall the wiring so it is not damaged nor
  will be damaged in operation of the machine by
  contact- ing sharp corners, or by rubbing
  against some ob- ject or hot surface. Do not
  connect wiring to a line containing fluid.
• Be sure all protective devices including guards
  and shields are properly installed and
  functioning correctly before starting a repair.
  If a guard or shield must be removed to perform
  the repair work, use extra caution and replace
  the guard or shield after repair is completed.
• The maintenance and repair work while holding
  the bucket raised is dangerous due to the
  possibil- ity of a falling attachment. Dont
  fail to lower the at- tachment and place the
  bucket to the ground be- fore starting the work.
• Loose or damaged fuel, lubricant and hydraulic
  lines, tubes and hoses can cause fires. Do not
  bend or strike high pressure lines or install
  ones which have been bent or damaged. Inspect
  lines, tubes and hoses carefully. Do not check
  for leaks with your hands. Very small (pinhole)
  leaks can re- sult in a high velocity oil stream
  that will be invisi- ble close to the hose. This
  oil can penetrate the skin and cause personal
  injury. Use card-board or paper to locate
  pinhole leaks.
• Tighten connections to the correct torque. Make
  sure that all heat shields, clamps and guards
  are installed correctly to avoid excessive heat,
  vibra- tion or rubbing against other parts
  during opera- tion. Shields that protect against
  oil spray onto hot exhaust components in event
  of a line, tube or seal failure must be
  installed correctly.
• Do not operate a machine if any rotating part is
  damaged or contacts any other part during opera-
  tion. Any high speed rotating component that has

been damaged or altered should be checked for
balance before reusing. (22) Be careful when
servicing or separating the tracks (crawlers).
Chips can fly when removing or install- ing a
track (crawlers) pin. Wear safety glasses and
long sleeve protective clothing. Tracks
(crawlers) can unroll very quickly when
separated. Keep away from front and rear of
machine. The ma- chine can move unexpectedly when
both tracks (crawlers) are disengaged from the
sprockets. Block the machine to prevent it from
moving.
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SAFETY PRECAUTIONS
CX31B CX36B
INDEX
Title Index No.
SPECIFICATIONS OUTLINE 1
SPECIFICATIONS SPECIFICATIONS 2
SPECIFICATIONS ATTACHMENT DIMENSIONS 3
MAINTENANCE TOOLS 11
MAINTENANCE STANDARD MAINTENANCE TIME TABLE 12
MAINTENANCE MAINTENANCE STANDARDS AND TEST PROCEDURES 13
SYSTEM HYDRAULIC SYSTEM 22
SYSTEM ELECTRICAL SYSTEM 23
SYSTEM COMPONENTS SYSTEM 24
DISASSEMBLING WHOLE DISASSEMBLING ASSEMBLING 31
DISASSEMBLING ATTACHMENTS 32
DISASSEMBLING UPPER SLEWING STRUCTURE 33
DISASSEMBLING TRAVEL SYSTEM 34
TROUBLESHOOTING HYDRAULIC SYSTEM 42
TROUBLESHOOTING ELECTRICAL SYSTEM 43
TROUBLESHOOTING ENGINE 44
E/G ENGINE 51
OPT.
OPT.
DATA SUPPORTING DATA 71
APPLICABLE MACHINES
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1. OUTLINE

• TABLE OF CONTENTS
• GENERAL PRECAUTIONS FOR REPAIRS
  ..................................................
  ... 1-3
• PREPARATION BEFORE DISASSEMBLING
  ..............................................
  1-3
• SAFETY IN DISASSEMBLING AND ASSEMBLING
  .................................... 1-3
• DISASSEMBLING AND ASSEMBLING HYDRAULIC EQUIPMENT
  ............ 1-3
• ELECTRICAL EQUIPMENT ............................
  ..............................................
  1-4
• HYDRAULIC PARTS ..................................
  ..................................................
  . 1-5
• WELDING REPAIR ..................................
  ..................................................
  ... 1-5
• ENVIRONMENTAL MEASURE ............................
  ......................................... 1-5
• INTERNATIONAL UNIT CONVERSION SYSTEM
  ............................................ 1-6

9
1. OUTLINE
1-1
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1. OUTLINE
GENERAL PRECAUTIONS FOR REPAIRS PREPARATION BEFORE
DISASSEM- BLING

1. Suspend warning tag "DO NOT OPERATE" from the
   doorknob or the operating lever, and have a
   preliminary meeting before starting work.
2. Stop the engine before starting inspection and
   maintenance to prevent the operator being caught
   in machine.
3. Identify the location of a first-aid kit and a
   fire extin- guisher, and also where to make
   contact in a state of emergency.
4. Choose a hard, level and safe place, and place
   the attachment on the ground securely.
5. Use a lifter such as a crane to remove heavy
   parts (20 kg 45 lbs or more) from the machine.
6. Use proper tools, and replace or repair defective
   tools.
7. Support the machine and attachment with supports
   or blocks if the work is performed in the lifted
   condi- tion.

1.1
1.1.1

• Understanding operating procedure
• Read OPERATION MAINTENANCE MANUAL
• carefully to understand the operating procedure.
• Cleaning machines
• Remove soil, mud, and dust from the machine be-
  fore carrying it into the service shop to prevent
  loss of work efficiency, damage of parts, and
  difficulty in rust prevention and dust protection
  while reassem- bling.
• Inspecting machines
• Identify the parts to be disassembled before
  start- ing work, determine the disassembling
  procedure by yourself considering the workshop
  situations etc., and request procurement of
  necessary parts in advance.
• Recording
• Record the following items for communication and
  prevention of recurring malfunction.

DISASSEMBLING AND ASSEMBLING HY- DRAULIC EQUIPMENT
1.1.3
(1) Removing hydraulic equipment

1. Before disconnecting pipes, release the hy-
   draulic pressure of the system, or open the re-
   turn side cover and take out the filter.
2. Carefully drain oil of the removed pipes into a
   containers without spilling on the floor.
3. Apply plugs or caps on the pipe ends to avoid
   oil spillage and dust intrusion.
4. Clean off the external surface of the equipment
   before disassembling, and drain hydraulic and
   gear oil before placing it on the workbench.

1. Inspection date and place.
2. Model name, applicable machine number, and hour
   meter read.
3. Trouble condition, place and cause.
4. Visible oil leakage, water leakage and damage.
5. Clogging of filters, oil level, oil quality, oil
   con- tamination and loosening of connections.
6. Result of consideration if any problem exists
   based on the operation rate per month calculat-
   ed from hour meter indication after the last in-
   spection date.

(2) Disassembling hydraulic equipment

1. Do not disassemble, reassemble or modify the
   hydraulic equipment without the permission of
   the manufacturer, who is not responsible for the
   performance and function of the product after
   modification.
2. When disassembling and reassembling for un-
   avoidable reason, refer the work to qualified
   personnel who have the specific knowledge or
   completed the parts service training.
3. Provide matching marks to facilitate reassem-
   bling work.
4. Before starting the work, read the manual of
   disassembling procedure, if it is provided, and
   decide whether the work can be performed by
   yourself.

(5) Arrangement and cleaning in service shop

1. Tools required for repair work.
2. Prepare space to place the disassembled parts.
3. Prepare oil containers for draining oil etc.

SAFETY IN DISASSEMBLING AND AS- SEMBLING
1.1.2
(1) Wear appropriate clothes with long sleeves,
safety shoes, safety helmet and protective
glasses.
1-3
11
1. OUTLINE

1. Use the special jig and tools without fail if
   they are specified.
2. If it is hard to remove a part according to the
   procedure, do not try it by force but
   investigate the cause.
3. Place the removed parts in order and attach tags
   to facilitate the reassembling.
4. Note the location and quantity of parts com-
   monly applied to multiple locations.

SWARNING Operation of the hydraulic equipment
with- out filling hydraulic oil or lubricant or
with- out performing air bleeding will result in
damage to the equipment.

• Perform air bleeding of the hydraulic pump and
  slewing motor after loosening the upper drain
  plug, starting the engine and keep it in low
  idle condition.
• Complete the air bleeding when seeping of hy-
  draulic oil is recognized, and tightly plug.
• Perform air bleeding of the travel motor and the
  hydraulic cylinders by running the engine for
  more than 5 minutes at low speed without load.

(3) Inspecting parts

1. Ensure that the disassembled parts are free from
   seizure, interference and uneven contact.
2. Measure and record wear condition of parts and
   clearance.
3. If the problem is found in a part, repair or re-
   place it with a new one.

SWARNING Do not allow the hydraulic cylinder to
bot- tom on the stroke end just after the mainte-
nance.
(4) Reassembling hydraulic equipment
1) Turn ON the ventilation fan or open windows
to maintain good ventilation prior to starting
the cleaning of parts.

1. Perform rough and finish cleaning before as-
   sembling.
2. Remove washing oil by air and apply clean hy-
   draulic or gear oil for assembling.
3. Always replace the removed O-rings, backup rings
   and oil seals with new ones by applying grease
   in advance.
4. Remove dirt and moisture from and perform de-
   greasing on the surface where liquid gasket to
   be applied.
5. Remove rust preventive agent from the new parts
   before use.
6. Fit bearings, bushings and oil seals using spe-
   cial jigs.
7. Assemble the parts utilizing matching marks.
8. Ensure all the parts are completely assembled
   after the work.

1. Perform air bleeding of pilot line by performing
   a series of digging, slewing and travel.
2. Check hydraulic oil level after placing the at-
   tachment to the oil check position, and replen-
   ish oil if necessary.

1.1.4
ELECTRICAL EQUIPMENT

1. Do not disassemble electrical equipment.
2. Handle it carefully not to drop and give a shock.
3. Turn the key OFF prior to connecting and discon-
   necting work.
4. Disconnect the connector by holding it and press-
   ing the lock. Do not pull the wire to apply
   force to the caulking portion.
5. Connect the connector and ensure it is completely
   locked.
6. Turn the key OFF prior to touching the terminal
   of starter or generator.
7. Remove the ground (earth) terminal of battery
   when handling tools around the battery or its
   relay.
8. Do not splash water on the electrical equipment
   and connectors during machine washing.
9. Check for moisture adhesion inside the waterproof
   connector after pulling it out, since it is hard
   to re- move moisture from the connector.

• Installing hydraulic equipment
• Ensure hydraulic oil and lubricant are properly
  supplied.
• Perform air bleeding when

1. Hydraulic oil changed
2. Parts of suction side piping replaced
3. Hydraulic pump installed
4. Slewing motor installed
5. Travel motor installed
6. Hydraulic cylinder installed

1-4
12
1. OUTLINE

• 1.1.6 WELDING REPAIR
• Refer repair welding to qualified personnel
  accord- ing to the appropriate procedure.
• Disconnect the ground (earth) cable of the
  battery before starting the repair.
• Failure to do so will cause damage to the
  electrical equipment.
• Move away the articles in advance that may cause
  fire if exposed to sparks.
• Before starting the repair of the attachment, do
  not fail to cover the plated surface of the
  piston rod with flameproof sheet to prevent it
  from being exposed to sparks.
• 1.1.7 ENVIRONMENTAL MEASURE
• Run the engine at the place that is sufficiently
  ven- tilated.
• Industrial waste disposal
• Dispose of the following parts according to the
  rel- evant regulations
• Waste oil and waste container Battery
• Precautions for handling hydraulic oil
• Exposure of eyes to hydraulic oil will cause
  inflam- mation. Wear protective glasses before
  handling to avoid an accident. If an eye is
  exposed to the oil, take the following emergency
  measures

If moisture adhesion is found, dry it completely
be- fore the connection.
SWARNING Battery electrolyte is
hazardous. Battery electrolyte is dilute sulfuric
acid. Exposure of skin or eyes to this liquid
will cause burning or loss of eyesight. If the
exposure occurs, take the following emergen- cy
measures and seek the advice of a medical spe-
cialist.

• When skin exposed
• Wash with water and soap sufficiently.
• When eyes exposed
• Immediately wash away with city water continu-
  ously for more than 10 minutes.
• When a large amount of the liquid flows out
  Neutralize with sodium bicarbonate or wash away
  with city water.
• When swallowed
• Drink a large amount of milk or water.
• When clothes exposed Immediately undress and
  wash.

1.1.5 HYDRAULIC PARTS

• When an eye exposed
• Immediately wash away with city water suffi-
  ciently till stimulative feeling vanishes.
• When swallowed
• Do not let vomit, and receive medical treatment
  immediately.
• When skin exposed
• Wash with water and soap sufficiently.

(1) O-ring

• Ensure O-rings have elasticity and are not dam-
  aged before use.
• Use the appropriate O-rings. O-rings are made of
  various kinds of materials having different
  hardness to apply to a variety of parts, such as
  the part for moving or fixed portion, subjected
  to high pressure, and exposed to corrosive fluid,
  even if the size is same.
• Fit the O-rings without distortion and bend.
• Always handle floating seals as a pair.

(4) Others Use replacement parts and lubricants
authorized as the genuine parts.

• Flexible hose (F hose)
• Use the appropriate parts. Different parts are
  used depending on the working pressure even the
  size of fitting and the total length of the hose
  is same.
• Tighten the fitting at the specified torque.
  Ensure no kink, tension, interference nor oil
  leakage is recognized.

1-5
13
1. OUTLINE
(3) Derived Units Table 1-3
INTERNATIONAL UNIT CON- VERSION SYSTEM (Based on
MARKS STANDARD
1.2
QUANTITY UNIT SYMBOL
Area square meter m2
Volume cubic meter m3
Velocity meter per second m/s
Acceleration meter per second squared m/s2
Density kilogram per cubic meter kg/m3
HANDBOOK FOR MECHANI- CAL ENGINEERS) Introduction
Although this manual includes International
System of Unit and Foot-Pound System of Units, if
you need SI unit, refer to the following
international system of units. Given hereinafter
is an excerpt of the units that are re- lated to
this manual.
(4) Derived Units bearing Peculiar
Designations Table 1-4
QUANTITY UNIT SYMBOL FORMULA
Frequency hertz Hz 1/s
Force newton N kg m/s 2
Pressure and Stress pascal Pa N/m2
Energy, Work and Quantity of heat joule J Nm
Power watt W J/s
Quantity of electricity coulomb C As
Electric potential difference, Voltage, and Electromotive force volt V W/A
Quantity of static electricity and Electric capacitance farad F C/V
Electric resistance ohm V/A
Celsius temperature celsius degree or degree C (t273.15)K
Illuminance lux lx lm/m2

• Etymology of SI Unites
• French Le Systeme International d Unites
  English International System of Units
• Construction of SI Unit System

Base units Table 1-1
Derived units of base units Table 1-2
Supplemen- tary units Table 1-2
SI units
SI unit system
Derived units bearing peculiar designations Table
1-4
Derived units
Prefixes of SI (n-th power of 10, where n is an
integer) Table 1-5
(1) Base units Table 1-1
QUANTITY UNIT SYMBOL
Length meter m
Mass kilogram kg
Time second s
Electric current ampere A
Thermodynamic temperature kelvin K
Amount of substance mol mol
Luminous intensity candela cd
(2) Supplementary units Table 1-2
QUANTITY UNIT SYMBOL
Plane angle radian rad
Solid angle steradian sr
1-6
14
1. OUTLINE (5) Prefixes of SI Table 1-5
PREFIX SYMBOL MULTIPLICATION FACTORS
giga G 109
mega M 106
kilo k 103
hecto h 102
deca da 10
deci d 101
centi c 102
milli m 103
micro ? 106
nano n 109
pico p 1012
(6) Unit Conversion Table 1-6
QUANTITY Gravitationa l SI CONVERSION FACTOR
Mass kg kg
Force kgf N 1 kgf 9.807 N
Torque kgfm Nm kgfm 9.807 Nm
Pressure kgf/cm2 MPa 1 kgf/cm2 0.09807 MPa
Motive Power PS kW 1 PS 0.7355 kW
Revolution rpm min1 r/min 1
1 Units that are allowed to use.
1-7
15
2. SPECIFICATIONS

• TABLE OF CONTENTS
• COMPONENTS NAME .................................
  ..................................................
  .. 2-3
• MACHINE DIMENSIONS ..............................
  ..................................................
  .. 2-4
• SPECIFICATIONS AND PERFORMANCE
  ..................................................
  ..... 2-6
• MACHINE COMPONENTS WEIGHT (DRY)
  .................................................
  2-7
• TRANSPORTATION ..................................
  ..................................................
  ..... 2-9
• TYPE OF CRAWLER SHOES ...........................
  .............................................
  2-11
• TYPE OF BUCKET ..................................
  ..................................................
  ..... 2-11
• ENGINE SPECIFICATIONS ............................
  ................................................
  2-13
• SPECIFICATIONS ..................................
  ..................................................
  .. 2-13
• ENGINE PERFORMANCE CURVE ........................
  .................................... 2-14

16
2. SPECIFICATIONS
2-1
17
2. SPECIFICATIONS
2.1
COMPONENTS NAME
32
33
30 31
36
15
16 17 8 18 12
34
35
37
19 3 5 4 6 1
13
14
11 29 20 7
28 27 24
2 10 21
25
26
23
22
9
No. NAME No. NAME No. NAME No. NAME
1 Engine 2 Oil filter 3 Radiator 4 Reservoir tank
5 Air cleaner 6 Muffler 7 Fuel tank 8 Hydraulic reservoir
9 Hydraulic pump 10 Slewing motor 11 Swing cylinder 12 Control valve
13 Travel lever 14 Safety lock lever 15 Canopy 16 Operating lever
17 Dozer operating lever 18 Throttle lever 19 Monitor panel (gauge cluster) Monitor panel (gauge cluster) Monitor panel (gauge cluster)
20 Battery 21 Swivel joint 22 Travel motor 23 Slewing bearing
24 Idler assy 25 Lower roller 26 Upper roller 27 Rubber track
28 Dozer blade 29 Dozer cylinder 30 Boom 31 Boom cylinder
32 Dipper cylinder 33 Light 34 Dipper 35 Link
36 Bucket cylinder 37 Bucket
2-3
18
2. SPECIFICATIONS 2.2 MACHINE DIMENSIONS (1)
CX31B (CANOPY)
Unit mm (ftin)
185(7.28")
1550 (51.0") 660 (22.0") 660 (22.0") 50 (2.0")
R775
(26.5")
85 (3.3")
4390 (144.8") 1840 (60.44")
1380 (46.3")
1550 (51.0")
775 (26.5")
2570 (85.2")
345 (13.6")
330 (13.0")
570 (110.4")
1550 (51.0")
1540 (50.6")
300
2000 (66.7")
(11.8")
1250 (41.2")
2550 (84.4")
1550 (51.0")
(2) CX31B (CAB)
185(7.28")
1550 (51.0") 660 (22.0") 660 (22.0") 50 (2.0")
R775
(26.5")
85 (3.3")
4390 (144.8")
1840 (60.44") 1380 (46.3")
1550 (51.0")
775 (26.5")
2570 (85.2")
345 (13.6")
330 (13.0")
570 (110.4")
1550 (51.0")
1540 (50.6")
300
2000 (66.7")
(11.8")
1250 (41.2")
2550 (84.4")
1550 (51.0")
2-4
19
2. SPECIFICATIONS Unit mm (ftin)
(3) CX36B (CANOPY)
160(6.3")
1700 (56.9") 660 (22.0") 660 (22.0") 50 (2.0")
R850
(29.5")
60 (2.4")
4710 (155.4")
1910 (63.2") 1460 (49.5")
1550 (51.0")
850 (29.5")
2570 (85.2")
345 (13.6")
330 (13.0")
570 (110.4")
1600 (53.0")
1700 (56.9")
300
2150 (70.6")
(11.8")
1400 (47.1")
2680 (89.5")
1700 (56.9")
(4) CX36B (CAB)
160(6.3")
1700 (56.9") 660 (22.0") 660 (22.0") 50 (2.0")
R850
(29.5")
60 (2.4")
4710 (155.4")
1910 (63.2") 1460 (49.5")
1550 (51.0")
850 (29.5")
2570 (85.2")
330 (13.0")
345 (13.6")
570 (110.4")
1600 (53.0")
1700 (56.9")
300
2150 (70.6")
(11.8")
1400 (47.1")
2680 (89.5")
1700 (56.9")
2-5
20
2. SPECIFICATIONS 2.3 SPECIFICATIONS AND
PERFORMANCE SPEED AND GRADEABILITY
Model CX31B CX31B CX31B CX31B CX36B CX36B CX36B CX36B
Applicable Machines PW11-30001 PW11-30001 PW11-30001 PW11-30001 PX12-11001 PX12-11001 PX12-11001 PX12-11001
Shoe Type Rubber shoe Rubber shoe Iron shoe (OPT) Iron shoe (OPT) Rubber shoe Rubber shoe Iron shoe (OPT) Iron shoe (OPT)
Slewing Speed min-1 rpm 8.9 8.9 8.9 8.9 8.9 8.9 8.9 8.9 8.9 8.9 8.9 8.9 8.9 8.9 8.9 8.9
Travel Speed km/h (mph) Low (1st) High (2nd) Low (1st) High (2nd) Low (1st) High (2nd) Low (1st) High (2nd)
Travel Speed km/h (mph) 2.5 4.5 2.5 4.5 2.5 4.5 2.5 4.5
Gradeability (degree) 58 (30) 58 (30) 58 (30) 58 (30) 58 (30) 58 (30) 58 (30) 58 (30)
ENGINE
Model (YANMAR) 3TNV88-PYB
Type Water-cooled, 4-cycle type Swirl chamber type diesel engine
Number of cylinders-Bore ? Stroke 3 - ø88 mm ? 90 mm (3.46 in ? 3.54 in)
Total Displacement L 1.642 (100.2 cuin)
Output Rating kW/min-1 PS/rpm 21.2 / 2400 29 / 2400
Maximum Torque Nm/min-1 (lbfft/rpm) 98.4 / 1440 (72.6 / 1440)
Starting Motor V ? kW 12 ? 1.7
Generator V ? A 12 ? 55
HYDRAULIC COMPONENTS
Hydraulic Pump Variable displacement axial piston gear pump
Hydraulic Motor Axial piston
Hydraulic Motor w/Reducer (Travel) 2-Axial piston, 2-Speed motor
Control Valve 10-spool multiple control valve
Cylinder (Boom, Dipper, Swing, Bucket, Doz- er) Double action cylinder
Return Filter Safety valve containing/Filter Type (30?)
SIDE DIGGING DOZER
Type Type Boom swing by hydraulic cylinder Boom swing by hydraulic cylinder
Boom Swing Angle Right 60 60
Boom Swing Angle Left 70 70
Stroke of Dozer (above/below) mm (in) Stroke of Dozer (above/below) mm (in) 560 / 410 (22.0/16.1) 540 / 440 (21.3 / 17.3)
WEIGHT
Machine Weight kg (lb) Rubber shoe Iron shoe Rubber shoe Iron shoe
Machine Weight kg (lb) 3,000 (6620) 3,110 (6860) 3,580 (7900) 3,700 (8160)
Upper slewing body kg (lb) 1,650 (3640) ? 1,900 (4190) ?
Travel system kg (lb) 1,050 (2320) 1,160 (2560) 1,140 (2520) 1,260 (2780)
Attachment (BoomSTD DipperSTD Bucket) kg (lb) 370 (815) 370 (815) 460 (1020) 460 (1020)
Oil Water kg (lb) 80 (175) 80 (175) ? ?
Note This figure is calculated with standard
bucket.
2-6
21
2. SPECIFICATIONS
2.4
MACHINE COMPONENTS WEIGHT (DRY)
Unit kg (lb)
MODEL CX31B CX31B CX31B CX31B CX31B
MODEL RUBBER SHOE RUBBER SHOE IRON IRON SHOE
MODEL CANOPY CAB CANOPY CANOPY CAB
COMPLETE MACHINE 3000 (6620) 3140 (6930) 3110 (6860) 3250 (7170)
UPPER FRAME ASSEMBLY (ASSY OF FOLLOWINGS) 1650 (3640) 1790 (3950) 1650 (3640) 1650 (3640) 1790 (3950)
UPPER FRAME 375 (825) ? ? ? ?
CANOPY / CAB 85 (187) 220 (485) 85 (187) 85 (187) 220 (485)
ENGINE 155 (340) ? ? ? ?
HYDRAULIC PUMP 28 (60) ? ? ? ?
RADIATOR 3 (7) ? ? ? ?
HYDRAULIC TANK 42 (93) ? ? ? ?
FUEL TANK 4 (9) ? ? ? ?
SWING BRACKET 93 (205) ? ? ? ?
SWING CYLINDER 37 (82) ? ? ? ?
SLEWING MOTOR 38 (84) ? ? ? ?
CONTROL VALVE 25 (55) ? ? ? ?
COUNTERWEIGHT 370 (815) ? ? ? ?
GUARD BONNET 92 (203) ? ? ? ?
BOOM CYLINDER 35 (77) ? ? ? ?
LOWER FRAME ASSEMBLY (ASSY OF FOLLOWINGS) 1050 (2320) ? 1160 (2560) 1160 (2560) ?
LOWER FRAME 310 (685) ? ? ? ?
SLEWING BEARING 42 (93) ? ? ? ?
TRAVEL MOTOR 42?2 (93?2) ? ? ? ?
LOWER ROLLER 6? 8 (13? 8) ? ? ? ?
FRONT IDLER 27 ?2 (60?2) ? ? ? ?
IDLER ADJUSTER 14?2 (31?2) ? ? ? ?
SPROCKET 9?2 (20?2) ? ? ? ?
RUBBER CRAWLER SHOE 125 ?2 (275?2) ?
300 mm (11.8") IRON SHOE 180?2 (395?2) 180?2 (395?2) ?
SWIVEL JOINT 22 (49) ? ? ? ?
DOZER 140 (310) ? ? ? ?
DOZER CYLINDER 27 (60) ? ? ? ?
ATTACHMENT ASSEMBLY (ASSY OF FOLLOWINGS) 370 (815) ? ? ? ?
BOOM ASSEMBLY 170 (375) ? ? ? ?
BOOM 120 (265) ? ? ? ?
DIPPER CYLINDER 30 (66) ? ? ? ?
DIPPER ASSEMBLY 120 (265) ? ? ? ?
DIPPER 70 (155) ? ? ? ?
BUCKET CYLINDER 20 (44) ? ? ? ?
BUCKET LINK 10 (22) ? ? ? ?
IDLER LINK 4?2 (9?2) ? ? ? ?
BUCKET ASSEMBLY (STD) 81 (180) ? ? ? ?
FLUIDS (ASSY OF FOLLOWINGS) 80 (176) ? ? ? ?
HYDRAULIC OIL 42 (93) ? ? ? ?
FUEL 32 (70) ? ? ? ?
COOLANT 4 (9) ? ? ? ?
Note Bucket weight is shown with standard bucket
weight.
2-7
22
2. SPECIFICATIONS
Unit kg (lb)
MODEL CX36B CX36B CX36B CX36B
MODEL RUBBER SHOE RUBBER SHOE IRON SHOE
MODEL CANOPY CAB CANOPY CAB
COMPLETE MACHINE 3580 (7900) 3720 (8210) 3700 (8160) 3840 (8470)
UPPER FRAME ASSEMBLY (ASSY OF FOLLOWINGS) 1900 (4190) 2040 (4500) 1900 (4190) 2040 (4500)
UPPER FRAME 375 (825) ? ? ?
CANOPY / CAB 85 (187) 220 (485) 85 (187) 220 (485)
ENGINE 155 (340) ? ? ?
HYDRAULIC PUMP 28 (60) ? ? ?
RADIATOR 3 (7) ? ? ?
HYDRAULIC TANK 42 (93) ? ? ?
FUEL TANK 4 (9) ? ? ?
SWING BRACKET 93 (205) ? ? ?
SWING CYLINDER 37 (82) ? ? ?
SLEWING MOTOR 38 (84) ? ? ?
CONTROL VALVE 25 (55) ? ? ?
COUNTERWEIGHT 665 (1470) ? ? ?
GUARD BONNET 92 (203) ? ? ?
BOOM CYLINDER 35 (77) ? ? ?
LOWER FRAME ASSEMBLY (ASSY OF FOLLOWINGS) 1140 (2520) ? 1260 (2780) ?
LOWER FRAME 370 (815) ? ? ?
SLEWING BEARING 42 (93) ? ? ?
TRAVEL MOTOR 42 ?2 (93?2) ? ? ?
LOWER ROLLER 6 ?8 (13?8) ? ? ?
FRONT IDLER 27?2 (60?2) ? ? ?
IDLER ADJUSTER 14?2 (31?2) ? ? ?
SPROCKET 9?2 (20?2) ? ? ?
RUBBER CRAWLER SHOE 134 ?2 (295?2) ?
300 mm (11.8") IRON SHOE 190 ?2 (420?2) ?
SWIVEL JOINT 22 (49) ? ? ?
DOZER 150 (330) ? ? ?
DOZER CYLINDER 27 (60) ? ? ?
ATTACHMENT ASSEMBLY (ASSY OF FOLLOWINGS) 460 (1020) ? ? ?
BOOM ASSEMBLY 190 (420) ? ? ?
BOOM 140 (310) ? ? ?
DIPPER CYLINDER 34 (75) ? ? ?
DIPPER ASSEMBLY 140 (310) ? ? ?
DIPPER 80 (175) ? ? ?
BUCKET CYLINDER 20 (44) ? ? ?
BUCKET LINK 10 (22) ? ? ?
IDLER LINK 4 ?2 (9?2) ? ? ?
BUCKET ASSEMBLY (STD) 89 (196) ? ? ?
FLUIDS (ASSY OF FOLLOWINGS) 80 (176) ? ? ?
HYDRAULIC OIL 42 (93) ? ? ?
FUEL 32 (70) ? ? ?
COOLANT 4 (9) ? ? ?
Note Bucket weight is shown with standard bucket
weight.
2-8
23
2. SPECIFICATIONS

• 2.5 TRANSPORTATION
• LOADING MACHINE ON A TRAILER
• Keep trailer bed clean. Put chocks against truck
  wheels.
• Use a ramp or loading deck. Ramps must be strong
  enough, have a low angle, and correct height.
  Load and unload machine on a level surface.
• Travel machine onto ramps slowly. Center the
  machine over the trailer.
• Lower all attachment.
• Stop engine. Remove key from switch.
• SWARNING
• Do not put chains over or against hydraulic lines
  or hoses.
• Fasten machine to trailer with chains or cables.
• During transportation, the bucket or attachments
  may hit the canopy or the cab. Therefore, set the
  machine in the transporting position by observing
  following points
• Extend the bucket cylinder fully.
• Extend the dipper cylinder fully.
• Lower the boom.
• If machine cannot be transported with dipper
  cylinder fully extended, remove bucket or
  attachment and ex- tend dipper cylinder.
• TRANSPORTATION DIMENSION AND WEIGHT OF ATTACHMENT
• BOOM WITH DIPPER CYLINDER

Model CX31B CX36B
L ? H ? W mm (ftin) 2390 ? 870 ? 320 (710.1") (210.2") (12.6") 2590 ? 810 ? 320 (86.0") (27.9") (12.6")
Weight w/dipper cyl. kg (lb) 163 (360) 184 (405)
H
L
2) DIPPER BUCKET
Model CX31B CX36B
L ? H ? W 2190 ? 450 ? 500 2360 ? 450 ?600
mm (ftin) (72.2") (17.7") (19.7") (78.9") (17.7") (111.6")
Weight kg (lb) 198 (435) 219 (485)
H
L
2-9
24
2. SPECIFICATIONS 3) DIPPER
Model CX31B CX36B
L ? H ? W 1520 ? 430 ? 280 1690 ? 430 ?280
mm (ftin) (411.8") (16.9") (11.0") (56.5") (16.9") (11.0")
Weight kg (lb) 101 (225) 123 (270)
H
L
4) BUCKET
Model CX31B CX36B
Heaped capacity m3(cuyd) 0.09 (0.118) 0.11 (0.144)
L ? H ? W mm (in) 670 ? 620 ? 500 (22.4") (20.4") (19.7") 670 ? 620 ? 600 (22.4") (20.4") (111.6")
Weight kg (lb) 81 (180) 89 (196)
H
L
5) DOZER w/o cylinder weight
Model CX31B CX36B
L ? H ? W 1230 ? 330 ? 1550 1280 ? 330 ? 1700
mm (in) (40.4") (13.0") (51.0") (42.4") (13.0") (56.9")
Weight kg (lb) 142 (315) 150 (330)
H
L
2-10
25
2. SPECIFICATIONS
2.6
TYPE OF CRAWLER SHOES
Type Model Shoe width mm (in) Total Crawler width Number of Link Ground pressure kPa (psi) Ground pressure kPa (psi)
Type Model Shoe width mm (in) mm (ftin) Number of Link CANOPY CAB
Rubber shoe CX31B 300 (11.8") 1550 (51.0") 82 29 (4.2) 30 (4.4)
Rubber shoe CX36B 300 (11.8") 1700 (56.9") 88 31 (4.5) 32 (4.6)
Iron shoe (option) CX31B 300 (11.8") 1550 (51.0") 42 31 (4.5) 32 (4.6)
Iron shoe (option) CX36B 300 (11.8") 1700 (56.9") 45 32 (4.6) 33 (4.8)
2.7
TYPE OF BUCKET
TYPE TYPE DIPPER DIPPER DIPPER DIPPER
Width mm (in) Heaped capacity m3 (cu.yd) (ISO 7451) Weight kg (lb) CX31B Length 1520 mm (411.84 in) CX36B Length 1690 mm (56.53 in)
Digging buckets 350 (11.78) 0.050 (0.06) 66.77 (147.20) ? ? ? ?
Digging buckets 450 (15.62) 0.070 (0.09) 72.63 (160.12) ? ? ? ?
Digging buckets 500 (17.68) 0.090 (0.11) 75.74 (166.97) ? ? ? ?
Digging buckets 600 (111.62) 0.110 (0.14) 81.96 (180.69) ? ? ? ?
Digging buckets 700 (23.55) 0.120 (0.15) 89.70 (197.75) ? ? ? ?
Digging buckets 800 (27.49) 0.130 (0.17) 97.45 (214.84) ? ? ? ?
Cleaning buckets 1000 (33.37) 0.160 (0.21) 69.04 (152.20) ? ? ?
Cleaning buckets 1200 (311.24) 0.176 (0.23) 77.44 (170.72) ? ? ?
Cleaning buckets 1400 (47.11) 0.196 (0.25) 85.85 (189.26) ? ? ?
? ? ?
2-11
26

• SPECIFICATIONS
• SWARNING
• The buckets with this length, during left dipper
  slewing higher than 1 m from ground, can
  interfere with the cabin. For a safe use, consult
  the Dealer and ask for left slewing limiter of
  the dipper support.
• Width with lateral cutter
• ? Width without lateral cutter
• ? Generic digging
• for digging and sand loading operations, gravel,
  clay, earth in general, etc.. The specific weight
  of the material should not be higher than 1400
  kg/m3.
• Digging for light applications for operations
  of digging,sand loading/unloading of gravel,
  clay, earth in friabile and dry state, ditch
  cleaning, etc.

2-12
27
2. SPECIFICATIONS
2.8 2.8.1
ENGINE SPECIFICATIONS SPECIFICATIONS
Model Model CX31B, CX36B CX31B, CX36B
Engine Model Engine Model 3TNV88-PYB 3TNV88-PYB
Type Type Vertical, 4-cycle water-cooled diesel engine Vertical, 4-cycle water-cooled diesel engine
No. of cylinders - Bore ? Stroke No. of cylinders - Bore ? Stroke 3 - 88 mm (3.46 in) ? 90 mm (3.54 in) 3 - 88 mm (3.46 in) ? 90 mm (3.54 in)
Total displacement Total displacement 1.642 liter (100 cuin) 1.642 liter (100 cuin)
Compression ratio Compression ratio 19.1 19.1
Rated output Rated output 21.2 kW (28.8 PS) at 2400 rpm 21.2 kW (28.8 PS) at 2400 rpm
Maximum torque Maximum torque 99 108 Nm (73.1 79.6 lbfft) at 1400 rpm 99 108 Nm (73.1 79.6 lbfft) at 1400 rpm
Low idling Low idling 1250 25 rpm 1250 25 rpm
High idling High idling 2590 25 rpm 2590 25 rpm
Fuel consumption rate Fuel consumption rate Less than 180 g / PSh Less than 180 g / PSh
Allowable tilting angles Allowable tilting angles Continuous 30 for all direction Continuous 30 for all direction
Rotating direction Rotating direction Counterclockwise as seen from flywheel side Counterclockwise as seen from flywheel side
Firing order Firing order 1-3-2-1 1-3-2-1
Fuel injection timing (FID, b.T.D.C.) Fuel injection timing (FID, b.T.D.C.) 14 1 14 1
Fuel injection pressure Fuel injection pressure 200 kg / cm2 (2840 psi) 200 kg / cm2 (2840 psi)
Valve action Open Close
Valve action Intake valve b.T.D.C. 15 5 a.B.D.C. 45 5
Valve action Exhaust valve b.T.D.C. 56 5 a.B.D.C. 18 5
Valve clearance Intake valve 0.2 mm (0.008 in) in cold condition 0.2 mm (0.008 in) in cold condition
Valve clearance Exhaust valve 0.2 mm (0.008 in) in cold condition 0.2 mm (0.008 in) in cold condition
Thermostat action Thermostat action Start 71 1.5 C (160 3 F) / Full open 85 C (185 F) Start 71 1.5 C (160 3 F) / Full open 85 C (185 F)
Compression pressure Compression pressure 3.43 0.1 MPa (500 14 psi) at 250 rpm 3.43 0.1 MPa (500 14 psi) at 250 rpm
Lubrication oil pressure Lubrication oil pressure 0.44 MPa (64 psi) at 2300 rpm 0.44 MPa (64 psi) at 2300 rpm
Dimensions L ? W ? H Dimensions L ? W ? H 585 ? 521 ? 648 mm (23.0 ? 20.5 ? 25.5 in) 585 ? 521 ? 648 mm (23.0 ? 20.5 ? 25.5 in)
Dry weight Dry weight 155 kg (342 lb) 155 kg (342 lb)
Governor Governor Mechanical centrifugal governor (All speed type) Mechanical centrifugal governor (All speed type)
Fuel filtration Fuel filtration cartridge type paper filter cartridge type paper filter
Lubrication system Lubrication system Forced lubrication with trochoid pump Forced lubrication with trochoid pump
Cooling system Cooling system Liquid cooling / Radiator Liquid cooling / Radiator
Starter capacity Starter capacity 12 V ? 1.7 kW 12 V ? 1.7 kW
Generator capacity Generator capacity 12 V ? 50 A 12 V ? 50 A
Starting aid Starting aid Air heater (12 V - 400 W) Air heater (12 V - 400 W)
Cooling water capacity Max / Engine Cooling water capacity Max / Engine 4.0 / 2.0 liter (1.06 / 0.53 gal) 4.0 / 2.0 liter (1.06 / 0.53 gal)
Engine oil volume Max / Effective Engine oil volume Max / Effective 6.7 / 2.8 liter (1.77 / 0.74 gal) 6.7 / 2.8 liter (1.77 / 0.74 gal)
2-13
28
2. SPECIFICATIONS 2.8.2 ENGINE PERFORMANCE CURVE
CX31B, CX36B Model 3TNV88A-PYB Rated Output
21.2 kW / 2400 min-1 (28.8 PS / 2,400 rpm)
Sd





Sd


GT




T











PS







F

GT
T
(92) (74) (55) (37) (18)
PS
F
min 1rpm
F
X P X ?
Fuel consumption volume
? X 1000 245
X 21.2 X ?

0.835 X 1000
6.21 ? F. Fuel consumption rate (g/kwh) P.
Shaft output (kw) ?? Specific gravity
T. Shaft torque F. Fuel consumption rate
PS.Power output GT. Exhaust temperature
?. Standard load factory (0.60 0.70)
Fuel consumption in normal operation 3.73 4.35
L/h Sd. Smoke Bosch (load factor (0.60 0.70))
2-14
29
3. ATTACHMENT DIMENSIONS
3

• TABLE OF CONTENTS
• BOOM ............................................
  ..................................................
  ................. 3-3
• BOOM DIMENSIONAL DRAWINGS ........................
  ..................................... 3-3
• BOOM MAINTENANCE STANDARDS ......................
  ................................... 3-4
• DIPPER ..........................................
  ..................................................
  ................. 3-7
• DIPPER DIMENSIONAL DRAWINGS .....................
  ..................................... 3-7
• DIPPER MAINTENANCE STANDARDS .....................
  .................................. 3-9
• BUCKET ..........................................
  ..................................................
  .............. 3-14
• BUCKET DIMENSIONAL DRAWINGS .....................
  .................................. 3-14
• DETAIL DIMENSIONAL DRAWINGS OF LUG SECTION
  .......................... 3-15
• DOZER ...........................................
  ..................................................
  ............... 3-16
• DOZER DIMENSIONAL DRAWINGS ......................
  ................................... 3-16
• DOZER MAINTENANCE STANDARDS .....................
  ................................ 3-17
• SWING ...........................................
  ..................................................
  ............... 3-19
• SWING BRACKET DIMENSIONAL DRAWINGS
  ........................................ 3-19
• SWING PORTION MAINTENANCE STANDARDS
  .................................... 3-20

30
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3. ATTACHMENT DIMENSIONS
3-1
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