Caterpillar Cat 345C L Mobile Hydraulic Excavator (Prefix M3F) Service Repair Manual (M3F00001 and up)

1
Service Repair Manual

• Models
• 345C and 345C L Mobile Hydraulic Excavator

2
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Product MOBILE HYD POWER UNIT Model 345C MOBILE
HYD POWER UNIT M3F Configuration 345C 345C L
Mobile Hydraulic Power Units M3F00001-UP
(MACHINE) POWERED BY C13 Engine
Disassembly and Assembly 345C Excavator and 345C
MHPU Mobile Hydraulic Power Unit Machine
Systems Media Number -RENR8612-06 Publication
Date -01/02/2013
Date Updated -21/02/2013
i03778971
Travel Motor - Assemble SMCS - 4351-016 Assembly
Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A 3E-3879 Eyebolt 1
D 4C-8359 Eyebolt 1
F 1P-1862 Pliers 1
G 1P-0510 Driver Group 1
J 4C-4030 Thread Lock Compound 1
K 180-6533 Seal Driver 1
L 6V-7030 Micrometer Depth Gauge 1
M 8T-0447 Calipers 1
N 1U-6396 O-Ring Assembly Compound 1
NOTICE Keep all parts clean from
contaminants. Contamination of the hydraulic
system with foreign material will reduce the
service life of the hydraulic system components.
3
To prevent contaminants from entering the
hydraulic system, always plug or cap the lines,
fittings, or hoses as they are disconnected.
Cover any disassembled components and clean them
properly before assembly. Clean the hydraulic
system properly after any major component
exchange or especially after a component failure,
to remove any contamination.
Note If a failure occurs, an accurate diagnosis
of the cause can prevent a recurrence.
Information is available to analyze failures for
piston pumps and motors. Refer to Special
Publication, SEBD0641, "Analyzing Axial Piston
Pump and Motor Failures". Note Inspect all
parts. If any parts are worn or damaged use new
parts for replacement. The installation of used
parts during reconditioning is acceptable. Reuse
and salvage information is available on piston
pumps. Refer to Guideline For Reusable Parts and
Salvage Operations, SEBF8032, "Piston Pumps and
Motors". During reconditioning, correct any
conditions that might have caused the original
failure. Note O-ring seals , gaskets, and seals
should always be replaced. A used O-ring seal may
not have the same sealing properties as a new
O-ring seal. Use Tooling (H) during the assembly
procedure. Note Apply a light film of "10W" oil
to all components before assembly.
Illustration 1
g01204890

1. Install O-ring seal (34) on plug (33).
2. Install piston (32) and the plug in the travel
   motor body. Tighten the plug to a torque of 430
   40 Nm (317 30 lb ft).

4
Illustration 2
g01204916

• Illustration 3 g01204919
• Apply a thin coat of Tooling (J) on the outer
  surfaces of lip seal (31).
• Use Tooling (K) and a suitable hammer to drive
  the lip seal into the travel motor body. Drive
  the seal downward until Tooling (K) makes contact
  with the travel motor housing.
• Use Tooling (F) to install retaining ring (30) to
  the shaft end of the travel motor body.

Illustration 4 g01204923 6. Install keys (29)
inside the travel motor body.
5
Illustration 5 g01204924 7. Assemble washers
(25), inner spacer (28) and outer spacer (27) in
the proper orientation, as shown.
Illustration 6 g01204931 8. Use Tooling (L) to
measure the distance from the outer spacer to the
surface of the table. The distance should be
22.1 0.6 mm (0.87 0.02 inch). If this
measurement is off, check orientation of the
washers. If orientation is correct, replace
washers and spacers with new parts.
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• Illustration 7 g00625917
• Install inner spacer (28), washers (25), and
  outer spacer (27) to barrel (24).
• Install guide (26) to the barrel.

Illustration 8 g00625911 11. Install piston
assemblies (23) with retainer (22) in the piston
assembly's original bore in barrel (24).
Illustration 9 g00625908 12. Install cam plate
(21) on the rotating group.
8
Illustration 10
g00666621
Illustration 11 g00628062 13. Use a suitable
press to install bearing (19) onto shaft assembly
(18).
Illustration 12 g00668076 14. Use a suitable
press in order to install inner race (20) onto
shaft assembly (18). Note Place the two support
plates under the lip of shaft assembly (18).
9
Illustration 13 g00626633 15. Insert shaft
assembly (18) in the rotating group.
Illustration 14
g00625891
Illustration 15 g00666743 16. Alternate disks
(17) and separator plates (16) into the travel
motor housing. Start with a separator plate and
end with a separator plate.
10
Illustration 16 g00626837 17. Attach Tooling (D)
to the shaft. Use a suitable lifting device in
order to place barrel assembly into the travel
motor body. Note Align the notches of the cam
plate with the keys in the travel motor body
before you lower the barrel assembly into the
travel motor body.
Illustration 17 g01204938 18. Use Tooling (M) to
measure the depth from the top surface of the
travel motor body to the bronze face of the
barrel assembly. The distance should be 32.2 2
mm (1.27 0.08 inch). If this measurement is
off, check orientation of the barrel assembly.
Also check if the cam plate is properly seated
on the keys.
11
Illustration 18
g00625888
Illustration 19 (15) O-Ring seals
g00667938
19. Install O-ring seals (15) and the backup
rings on the brake piston. Note Make sure that
you install the backup ring and the O-ring seal
in the original position. Refer to Illustration
19.
12
Illustration 20 g00629015 20. Install brake
piston (14) in the body of the travel motor by
hand. It may be necessary to use a soft faced
hammer to seat the brake piston correctly.
Illustration 21 g01204953 21. Use Tooling (M) to
measure the distance from the top of the brake
piston (14) to the top surface of the travel
motor body. The distance should be 20.8 1.0 mm
(0.82 0.04 inch). If this measurement is off,
drive the brake piston further into the travel
motor body.
Illustration 22
g00627391
22. Install springs (12) and plate (11).
13
23. Install O-ring seals (13).
Illustration 23 g01204965 24. Use Tooling (G) to
drive the bearing into the head.
Illustration 24
g00627405

1. Install O-ring seal (9) onto the head.
2. Install port plate (8) on the head. It may be
   necessary to apply a small amount of grease to
   the port plate in order to hold the port plate in
   place during the installation of the head.

Illustration 25
g01205007
14
27. Turn over head (6). Install Tooling (A) onto
the head. Use a suitable lifting device to
install the head onto the travel motor.
Illustration 26
g00631594
28. Install Pins (7) into the head.
Illustration 27
g00628657

1. Install an O-ring on each plug (5).
2. Install bolts (4) which hold the head in place.
   Tighten the six bolts to a torque of 530 70
   Nm (391 52 lb ft).
3. Install plugs (5) that hold the pins in the head.
   Tighten the plugs to a torque of 75 7 Nm (55
   5 lb ft).

15
Illustration 28 g00624938 32. Install O-ring
seals (2) and rings (3) on the displacement
change valve.

• Illustration 29 g00627438
• Install displacement change valve (1) onto the
  head of the travel motor. Tighten the
  displacement change valve to a torque of 50 3
  Nm (37 2 lb ft).
• To prevent possible damage to the travel motor,
  the unit should be filled with oil at least up
  to the fill port prior to operation. Refer to
  Operation and Maintenance Manual for the correct
  oil specification.
• End By
• a. Install the travel motor. Refer to Disassembly
  and Assembly, "Travel Motor - Install".

Copyright 1993 - 2020 Caterpillar Inc. All
Rights Reserved. Private Network For SIS
Licensees.
Sat Aug 1 105202 UTC0800 2020
16
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Product MOBILE HYD POWER UNIT Model 345C MOBILE
HYD POWER UNIT M3F Configuration 345C 345C L
Mobile Hydraulic Power Units M3F00001-UP
(MACHINE) POWERED BY C13 Engine
Disassembly and Assembly 345C Excavator and 345C
MHPU Mobile Hydraulic Power Unit Machine
Systems Media Number -RENR8612-06 Publication
Date -01/02/2013
Date Updated -21/02/2013
i02429546
Travel Motor - Install SMCS - 4351-012 Installati
on Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A - Threaded Rod M 20 X 2.5 by 18 inch 2
B 140-7742 Sleeve 1
Note Cleanliness is an important factor. Before
assembly, all parts should be thoroughly 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.
17
Illustration 1
g01213930
Illustration 2 g01213930 1. Install Tooling (A)
as a guide. Attach Tooling (B) and a suitable
lifting device onto travel motor (4). The weight
of travel motor assembly (4) is approximately 127
kg (280 lb). Position travel motor assembly (4)
and install bolts (3).

• Illustration 3 g01213929
• Install bolts (2). Connect hose assemblies (1).
• End By
• a. Install the counterbalance valve. Refer to
  Disassembly and Assembly, "Counterbalance Valve
  (Travel) - Install".

Copyright 1993 - 2020 Caterpillar Inc. All
Rights Reserved. Private Network For SIS
Licensees.
Sat Aug 1 105259 UTC0800 2020
18
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Product MOBILE HYD POWER UNIT Model 345C MOBILE
HYD POWER UNIT M3F Configuration 345C 345C L
Mobile Hydraulic Power Units M3F00001-UP
(MACHINE) POWERED BY C13 Engine
Disassembly and Assembly 345C Excavator and 345C
MHPU Mobile Hydraulic Power Unit Machine
Systems Media Number -RENR8612-06 Publication
Date -01/02/2013
Date Updated -21/02/2013
i02429611
Final Drive and Travel Motor - Remove SMCS -
4050-011 4351-011 Removal Procedure Table 1
Required Tools Required Tools Required Tools Required Tools
Tool Part Number Part Description Qty
A Block 1
B 1U-6221 Hydraulic Torque Wrench Assembly 1
B 132-8154 3/4 inch Square Drive Link 1
B 132-8223 Power Pack 1
C 138-7575 Link Bracket 2
Note The final drive sprocket does not need to
be removed prior to removal of the final drive.
The sprocket must be removed in order to
disassemble the final drive. Note The procedure
to remove the right hand final drive and the
procedure to remove the left hand final drive is
identical. The procedure that follows is for one
of the final drives. 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 before opening any compartment or
disassembling any component containing fluids.
19
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.
1. Release track tension. Refer to Operation and
Maintenance Manual, "Track Adjustment - Adjust".

• Illustration 1 g01213996
• Start the machine and position track roller (1)
  on Tooling (A). Make sure that the pin for
  separating the track is positioned over the final
  drive.
• Separate the track. Refer to Disassembly and
  Assembly, "Track - Seperate".
• Drain the final drive. Refer to Operation and
  Maintenance Manual, "Final Drive Oil - Change".
• Remove the counterbalance valve. Refer to
  Disassembly and Assembly, "Counterbalance Valve
  - Remove and Install".

20
Illustration 2 g01214021 6. Attach two lifting
slings and a suitable lifting device to final
drive (2), as shown. It may be necessary to
adjust the lifting straps for correct balance of
the final drive.
Illustration 3
g01214049
Illustration 4
g01214023
21

1. Disconnect hose assemblies (3). Remove fittings
   (4) and bolts (5).
2. Use Tooling (B) to remove bolts (5) and the
   washers that hold the final drive to the
   undercarriage frame assembly. Carefully remove
   the final drive and the travel motor from the
   undercarriage frame assembly. The combined weight
   of the final drive and the travel motor is 725
   kg (1600 lb).

• Illustration 5 g01214002
• Invert final drive assembly (6) onto the cover,
  as shown.
• Attach Tooling (C) and a suitable lifting device
  in order to remove travel motor (6). The weight
  of travel motor assembly (6) is approximately 127
  kg (280 lb). Remove travel motor assembly (6).

Copyright 1993 - 2020 Caterpillar Inc. All
Rights Reserved. Private Network For SIS
Licensees.
Sat Aug 1 105356 UTC0800 2020
22
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Product MOBILE HYD POWER UNIT Model 345C MOBILE
HYD POWER UNIT M3F Configuration 345C 345C L
Mobile Hydraulic Power Units M3F00001-UP
(MACHINE) POWERED BY C13 Engine
Disassembly and Assembly 345C Excavator and 345C
MHPU Mobile Hydraulic Power Unit Machine
Systems Media Number -RENR8612-06 Publication
Date -01/02/2013
Date Updated -21/02/2013
i05331566
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 1P-2420 Transmission Stand Group 1
B 138-7573 Link Bracket 2
C 1P-1860 Retaining Ring Pliers 1
D 4C-8359 Eyebolt 3
E 4C-8359 Eyebolt 2
F 138-7574 Link Bracket 2
Start By A. Remove the final drive. Refer to
Disassembly and Assembly, "Final Drive and Travel
Motor - Remove" in this manual. 1. Thoroughly
clean the outside of the final drive and travel
motor prior to disassembly.
23

• Illustration 1 g01207795
• Remove coupling (1) from final drive (2) .
• Attach a suitable lifting device to the final
  drive, and turn final drive (2) over 180 degrees.
  The weight of final drive (2) is approximately
  590 kg (1300 lb).

• Illustration 2 g01207796
• Attach the final drive to Tooling (A) . Put an
  alignment mark across the sections of the final
  drive for assembly purposes. All parts must be
  reinstalled in the original locations.
• Remove socket head screws (3) from the final
  drive cover.

24

• Illustration 3 g01207801
• Attach Tooling (B) and a suitable lifting device
  to cover (5) , as shown. The weight of cover
• (5) is approximately 52 kg (115 lb).
• Remove bolts (4) and the washers that hold the
  cover in place.
• Use a soft faced hammer in order to break the
  seal between cover (5) and the ring gear. Remove
  cover (5) . The weight of cover (5) is 52 kg (115
  lb).

Illustration 4
g01207835
9. Remove spacer (6) from the cover.
25
Illustration 5
g01207845

1. Remove shims (7) from the cover.
2. Remove socket head bolts (8) and ring gear (9)
   from the cover.

• Illustration 6 g01207864
• Remove sun gear (10) from carrier assembly (11) .
  Remove carrier assembly (11) by lifting the
  carrier assembly straight up.
• Disassemble carrier assembly (11) , as follows

26
Illustration 7 g01207865 a. Remove spacers (12)
. A spacer is located on each side of the sun
gear in carrier assembly (11) . Note Planetary
gears (15) might be stamped with identification
marks "L". Note the position of the
identification marks in relation to the carrier
for assembly purposes.

• Illustration 8 g01207897
• Remove retaining ring (13) with Tooling (C) .
• Remove thrust washers (14) and planetary gear
  (15) from the carrier.
• Remove bearing (16) from the planetary gear.
• Repeat Steps 13.b through 13.d for the other two
  planetary gears.

Illustration 9 g01208035 f. Use a screwdriver in
order to remove retaining ring (17) from the
carrier. Remove sun gear (18) from the carrier.
27
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• Illustration 10 g01208136
• Attach Tooling (D) and a suitable lifting device
  to carrier assembly (19) , as shown. Remove
  carrier assembly (19) by pulling the carrier
  assembly straight up. The weight of carrier
  assembly (19) is approximately 45 kg (100 lb).
• Disassemble carrier assembly (19) , as follows
• Note Spacer (20) may remain with carrier
  assembly (19) , or the spacer may remain with
  carrier assembly (28) . Refer to Step 17.

Illustration 11 g01208162 a. Remove spacer (20)
from carrier assembly (19) .
29
Illustration 12 g01208169 b. Drive spring pin
(21) into planetary shaft (22) with a hammer and
a punch.

• Illustration 13 g01208189
• Remove planetary shaft (22) , two thrust washers
  (23) and planetary gear (24) from the carrier.
• Note Planetary gears (24) might be stamped with
  identification marks "M". Note the position of
  the identification marks in relation to the
  carrier for assembly purposes.
• Remove bearing (25) from the planetary gear.
• Remove spring pin (21) from planetary shaft (22)
  with a hammer and a punch.
• Repeat Steps 15.b through 15.e in order to remove
  the other two planetary gears from the carrier.

30
Illustration 14 g01208245 g. Use a screwdriver
to remove retaining ring (26) . Remove sun gear
(27) from the carrier.
Illustration 15 g01208253 16. If spacer (20) was
not removed in Step 15.a, remove the spacer from
carrier assembly (28) at this time.
Illustration 16
g01208256
31
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