Caterpillar Cat 318D2 L Excavator (Prefix TZS) Service Repair Manual (TZS00001 and up)

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Product EXCAVATOR Model 318D2 L EXCAVATOR
TZS Configuration 318D2 L Excavator TZS00001-UP
(MACHINE) POWERED BY 3054C Engine
Disassembly and Assembly 318D2 Excavator Machine
Systems Media Number -UENR0198-03 Publication
Date -01/12/2014
Date Updated -27/06/2018
i07255515
Final Drive - Disassemble SMCS -
4050-015 Disassembly Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 477-3191 M14x2x18 mm Lifting Eye Assembly 2
B 1P-2420 Transmission Repair Stand 1
C 6V-8214 M6x20mm Bolt 2
C 9X-8267 M6 Washer 2
D 8H-0663 Bearing Puller Assembly 1
E 422-5474 M16x2x24mm Lifting Eye Assembly 2
F 439-3938 Link Bracket 3
G 1U-9889 Crossblock 1
Start By a. Remove the final drive and the
travel motor assembly. NOTICE Care must be
taken to ensure that fluids are contained
during performance of inspection, maintenance,
testing, adjusting, and repair of the product. Be
prepared to collect the fluid with suitable
containers
2
before opening any compartment or disassembling
any component containing fluids. Refer to Special
Publication, NENG2500, "Dealer Service
Tool Catalog" for tools and supplies suitable to
collect and contain fluids on Cat
products. Dispose of all fluids according to
local regulations and mandates.
Personal injury can result from hydraulic oil
pressure and hot oil. Hydraulic oil pressure can
remain in the hydraulic system after the engine
has been stopped. Serious injury can be caused if
this pressure is not released before any service
is done on the hydraulic system. Make sure all of
the work tools have been lowered to the ground,
and the oil is cool before removing any
components or lines. Remove the oil filler cap
only when the engine is stopped, and the filler
cap is cool enough to touch with your bare hand.

1. Thoroughly clean the outside of the final drive
   and travel motor prior to disassembly.
2. Remove the sprocket from the final drive and the
   travel motor assembly. The weight of the sprocket
   is approximately 36 kg (79 lb).

Illustration 1 g06260984 3. Use Tooling (A) and
a suitable lifting device to position final drive
assembly (1) onto Tooling (B). The weight of
final drive assembly (1) is approximately 281 kg
(620 lb).
3
Personal injury can result from being struck by
parts propelled by a released spring force. Make
sure to wear all necessary protective
equipment. Follow the recommended procedure and
use all recommended tooling to release the spring
force.
Illustration 2
g06261012
Illustration 3 g06261017 4. Remove plug (2),
spring (4), seat (3), and the O-ring seal.
Personal injury can result from being struck by
parts propelled by a released spring force.
4
Make sure to wear all necessary protective
equipment. Follow the recommended procedure and
use all recommended tooling to release the spring
force.
Illustration 4
g06261029
Illustration 5 g06261032 5. Remove plug (5),
spring (6), seat (7), stem assembly (8), and the
O-ring seal.
Personal injury can result from being struck by
parts propelled by a released spring force. Make
sure to wear all necessary protective
equipment. Follow the recommended procedure and
use all recommended tooling to release the spring
force.
5
Illustration 6
g06261260
Illustration 7 g06261275 6. Remove plug (9),
spring (12), seat (11), spool (10), and the
O-ring seal.
Illustration 8
g06261285
7. Remove adapter (13) and the O-ring seal.
6
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Personal injury can result from being struck by
parts propelled by a released spring force. Make
sure to wear all necessary protective
equipment. Follow the recommended procedure and
use all recommended tooling to release the spring
force.
Illustration 9
g06261336
Illustration 10 g06261344 8. Remove plug (14),
spring (16), valve (15), and the O-ring seal.
Personal injury can result from being struck by
parts propelled by a released spring force. Make
sure to wear all necessary protective
equipment. Follow the recommended procedure and
use all recommended tooling to release the spring
force.
8
Illustration 11
g06261519
Illustration 12 g06261532 9. Remove plug (17),
spring (19), valve (18), and the O-ring seal.
Personal injury can result from being struck by
parts propelled by a released spring force. Make
sure to wear all necessary protective
equipment. Follow the recommended procedure and
use all recommended tooling to release the spring
force.
9
Illustration 13
g06261538
Illustration 14
g06261539

1. Remove plugs (20) and the O-ring seals.
2. Remove plugs (21), springs (23), valves (22), and
   the O-ring seals.

Personal injury can result from being struck by
parts propelled by a released spring force. Make
sure to wear all necessary protective
equipment. Follow the recommended procedure and
use all recommended tooling to release the spring
force.
10
Illustration 15
g06261563
12. Remove bolts (24) and valve body (25).
Illustration 16 g06263306 Port plate (28) may
still be adhered to the barrel assembly. 13.
Remove springs (26), port plate (28), and O-ring
seals (27).
Illustration 17
g06261586

1. Remove bearing (29).
2. Remove O-ring seal (30).

11
Illustration 18 g06261622 16. Use Tooling (C)
and suitable prying devices to remove piston
assembly (31).
Illustration 19 g06261625 17. Remove O-ring seal
(32) and O-ring seal (33).
Illustration 20
g06261647
12
Illustration 21 g06261665 18. Remove separator
plates (34) and friction plates (35). Note the
alternating order of separator plates (34) and
friction plates (35) for assembly purposes.
Illustration 22 g06261896 19. Remove barrel
assembly (36). Do not allow the components of
barrel assembly (36) to come apart while you
remove barrel assembly (36). The components of
barrel assembly (36) must be reinstalled in the
original positions.
Illustration 23 g06261908 20. Remove piston
assemblies (37) and retainer (38).
13
Note Mark the component locations for assembly
purposes before you disassemble the barrel
assembly.
Personal injury can result from being struck by
parts propelled by a released spring force. Make
sure to wear all necessary protective
equipment. Follow the recommended procedure and
use all recommended tooling to release the spring
force.
Illustration 24
g06261915
21. Remove guide (39).
Illustration 25
g06261922
22. Remove springs (40).
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Illustration 26 g06261927 23. Put location marks
on swashplate (41) for assembly purposes. Remove
swashplate (41).
Personal injury can result from being struck by
parts propelled by a released spring force. Make
sure to wear all necessary protective
equipment. Follow the recommended procedure and
use all recommended tooling to release the spring
force.
Illustration 27
g06261980
15
Illustration 28 g06261983 24. Remove shaft
assembly (42), keys (44), piston (43), and spring
(45).
Illustration 29 g06261987 25. Use a suitable
press and Tooling (D) to remove bearing (46) off
the shaft assembly.
Illustration 30
g06262009
16
Illustration 31 g06262033 26. Use Tooling (E)
and a suitable lifting device to remove final
drive assembly (47) from Tooling (B) and
reposition final drive assembly (47) as shown.
The weight of final drive assembly (47) is
approximately 240 kg (530 lb).
Illustration 32 g06262046 27. Remove drain plugs
(48), bolts (49), and cover (50).
Illustration 33 g06262473 28. Use Tooling (F)
and a suitable lifting device to remove carrier
assembly (51). The weight of carrier assembly
(51) is approximately 27 kg (60 lb).
17
Illustration 34
g06262494
Illustration 35 g06262505 29. Remove pins (53),
planetary shafts (54), planetary gears (52),
needle bearings (55), and washers (56).
Illustration 36
g06262780
30. Remove sun gear (57).
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Illustration 37
g06262792
31. Remove sun gear (58).
Illustration 38 g06262846 32. Use Tooling (F)
and a suitable lifting device to remove carrier
assembly (59). The weight of carrier assembly
(59) is approximately 54 kg (120 lb).
Illustration 39
g06262855
19
Illustration 40
g06262866
Illustration 41 g06262909 33. Remove pins (60),
planetary shafts (62), planetary gears (61),
needle bearings (63), and washers (64).
Illustration 42
g06262924
34. Remove coupling (65).
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Illustration 43 g06262975 35. Use Tooling (F)
and a suitable lifting device to remove final
drive assembly (66) from Tooling (B). The weight
of final drive assembly (66) is approximately 154
kg (340 lb).
Illustration 44
g06263177
Illustration 45
g06263185
21
Illustration 46 g06263201 36. Use Tooling (G)
and a suitable press to remove washers (67).
Illustration 47 g06263235 37. Use Tooling (F)
and a suitable lifting device to separate
sprocket housing (68) and travel motor housing
(69). The weight of sprocket housing (68) is
approximately 95 kg (210 lb). The weight of
travel motor housing (69) is approximately 59 kg
(129 lb).
Illustration 48
g06263252
38. Remove duo cone seal (70).
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Illustration 49
g06263257
39. Remove bearing (71) and bearing (72).
Illustration 50 g06263266 40. Remove duo cone
seal (73) and shim (74).
Illustration 51
g06263284
41. Remove lip seal (75).
Copyright 1993 - 2020 Caterpillar Inc. All Rights
Reserved.
Mon Nov 16 003230 UTC0800 2020
23
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Previous Screen
Product EXCAVATOR Model 318D2 L EXCAVATOR
TZS Configuration 318D2 L Excavator TZS00001-UP
(MACHINE) POWERED BY 3054C Engine
Disassembly and Assembly 318D2 Excavator Machine
Systems Media Number -UENR0198-03 Publication
Date -01/12/2014
Date Updated -27/06/2018
i05453369
Final Drive - Assemble SMCS - 4050-016 Assembly
Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 1P-2420 Transmission Repair Stand 1
B 439-3938 Link Bracket 2
D 439-3940 Link Bracket 2
G 126-3994 Duo-Cone Seal Installer 1
H - Loctite C5-A Anti-Seize Lubricant
F - Loctite High Flex From-In-Place Gasket
Note Cleanliness is an important factor. Before
assembly, all parts should be cleaned in cleaning
fluid. Allow the parts to air dry. Wiping cloths
or rags should not be used to dry parts. Lint may
be deposited on the parts which may cause later
trouble. Inspect all parts. If any parts are worn
or damaged, use new parts for replacement. All
disassembly and all assembly procedures must be
performed on a clean work surface and in a clean
hydraulic area. Keep cleaned parts covered and
protected at all times. Note O-rings, gaskets,
and seals should always be replaced. A used
O-ring may not have the same sealing properties
as a new O-ring. Use 1U-6396 O-Ring Assembly
Compound during the assembly procedure. Note
Apply a light film of hydraulic oil to all
components before assembly. 1. Install the final
drive sprocket if the sprocket was removed from
the main housing.
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2. Refer to Disassembly and Assembly, "Final
Drive Sprocket - Remove and Install".

• Illustration 1 g00708215
• Apply Tooling (H) to the outer diameter of the
  bearings.
• Install bearings (32) and (33) in main housing
  (18) with a suitable press.
• Make sure that bearing (32) and bearing (33)
  contact the counter bore in the main housing.
• Use the following procedure to preload the
  bearings and determine the correct thickness of
  shims.

• Illustration 2 g00713058
• Fasten Tooling (D) and a suitable lifting device
  to main housing (18). Install the main housing
  on the motor housing.
• Put the main housing and the motor housing in a
  suitable press.

25

• Illustration 3
• Bearing surface
• Housing surface

g00709278

1. Use a suitable press and a spacer in order to
   apply a load of 4000 kg (8819 lb) on the
   bearings. Rotate the housing in order to seat
   the bearings.
2. Reduce the load on the bearings to 1000 100 kg
   (2205 221 lb).
3. Use a depth micrometer in order to measure the
   step length between the bearing surface and the
   housing surface. Take measurements at several
   different locations around the housing. Compute
   the average of the measured dimensions and record
   the number. Call this Dimension (Y).

• Illustration 4 g00709276
• Use a depth micrometer in order to measure the
  step length of gear (26). Take measurements at
  several different locations around the gear.
  Compute the average of the measured dimensions
  and record the number. Call this Dimension (X).
• The thickness of the shims is equal to (X - Y)
  0.05 mm (0.002 inch).
• Note Use no more than two shims. If two shims
  are required, install the thinner shim next to
  the gear.
• Remove the main housing from the motor housing.

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Illustration 5 g01021370 7. Use Tooling (G) in
order to install Duo-Cone seal (31) in main
housing (18). Refer to Disassembly and Assembly,
"Duo-Cone Conventional Seals - Install". Note
The rubber seals and all surfaces that contact
the seals must be clean and dry. After
installation of the seals, put clean SAE 30 oil
on the contact surfaces of the metal seals.
Illustration 6 g01021371 8. Use Tooling (G) in
order to install Duo-Cone seal (29) in motor
housing (28).
Illustration 7
g00708214
29

• Apply Tooling (H) to the surfaces that contact
  pins (30).
• Install alignment pins (30).
• Note Do not damage the Duo-Cone seals in the
  main housing or in the motor housing during the
  assembly of the two components. After
  installation of the main housing on the motor
  housing, there will be a small gap between the
  components. The gap is caused by the Duo-Cone
  seals. This gap will be eliminated during
  installation of gear (26).

Illustration 8 g00713058 11. Fasten Tooling (D)
and a suitable lifting device to main housing
(18). Install the main housing on the motor
housing.
Illustration 9 g00708211 12. Install shims (27)
that were determined in Step 6.g in the main
housing. Note If two shims are required, install
the thinner shim next to the gear.
30
Illustration 10
g00708187

1. Install gear (26).
2. Install bolts (25) in gear (26). Install the
   bolts in an even pattern until the gear is seated
   against the bearing. Tighten bolts (25) in a
   crisscross pattern.

Illustration 11 g00708186 15. Install O-ring
seal (24) to main housing (18).
Illustration 12 g00708175 16. Assemble carrier
assembly (15), as follows.
31
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