Caterpillar Cat 345C and 345C L Mobile Hydraulic Excavator (Prefix M3E) Service Repair Manual Instan

Service Repair Manual

Models

345C and 345C L Mobile Hydraulic Excavator

345C & 345C L Mobile Hydraulic Power Units M3E00001-UP (MACHINE) POWER...

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Shutdown SIS Previous Screen Product: MOBILE HYD POWER UNIT Model: 345C L MOBILE HYD POWER UNIT M3E Configuration: 345C & 345C L Mobile Hydraulic Power Units M3E00001-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

i02407350

Travel Motor - Disassemble SMCS - 4351-015

Disassembly Procedure Start By: a. Remove the travel motor. Refer to Disassembly and Assembly, "Travel Motor - Remove" .

Table 1 Required Tools Tool

Part Number

Part Description

Qty

A

3E-3879

Eyebolt

1

B

1P-0074

Slide Hammer Puller

1

C

6V-3010

Puller Group

1

D

4C-8359

Eyebolt

1

E

9S-9152

Bearing Puller

1

F

1P-1862

Pliers

1

G

1P-0510

Driver Group

1

H

1U-7600

Slide Hammer Puller

1

NOTICE Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair

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of the product. Be prepared to collect the fluid with suitable containers 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.

NOTICE Failure to properly assemble parts or failure to follow established procedures can lead to damage to the parts and assembly.

To avoid damage to parts, always identify and mark the parts so that they can be installed into the same location. Never force parts during assembly. Keep parts clean and lubricated.

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.

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.

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1. Thoroughly clean the outside of the travel motor prior to disassembly. Fasten the travel motor to a suitable holding fixture in a vertical position. The weight of the travel motor is 141 kg (310 lb).

Illustration 1

g00627438

2. Remove displacement change valve (1) from the head of the travel motor.

Illustration 2

g00624938

3. Remove O-ring seals (2) and rings (3) from the displacement change valve.

Illustration 3

g00628657

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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.

4. Remove plugs (5) from the head. Remove an O-ring seal from each plug.

5. Remove outer bolts (4) from the head of the travel motor.

Illustration 4

g00624949

6. Use Tooling (A) and a suitable lifting device to remove the head of the travel motor from the travel motor housing. The weight of head (6) is approximately 43 kg (95 lb).

Note: There are pins (7) that may fall out of the inside of the head when the head is removed.

Note: Be careful during the removal of head (6) from the travel motor housing. Be careful not to scratch mating surfaces or damage the mating surfaces of the components.

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Illustration 5

g00624953

7. Turn over the head. If pins (7) are in the bottom side of the head, remove the pins.

Illustration 6

g00627405

8. Remove port plate (8) and O-ring seal (9) from the head.

Illustration 7

g00625967

9. Use Tooling (B) in order to remove bearing (10) from the head of the travel motor.

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Illustration 8

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g00627391

10. Remove plate (11) and remove springs (12) from the travel motor housing.

11. Remove O-ring seals (13) from the upper surface of the travel motor housing.

Illustration 9

g00627377

12. Install Tooling (C) on the brake piston (14). Remove the brake piston.

Illustration 10

g00625888

13. Remove O-ring seals (15) and the backup rings from the brake piston.

Note: Make sure that you take note of the location of the O-rings versus the backup rings.

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Illustration 11

g00625891

14. Remove separator plates (16) from the travel motor housing.

Illustration 12

g00666743

15. Remove disks (17) from the travel motor housing.

Illustration 13

g00626837

16. Install Tooling (D) to the shaft and use a suitable lifting device in order to remove the rotating group from the travel motor housing. The weight of the rotating group is 29 kg (65 lb).

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Note: Do not allow the components of the rotating group to come apart during the removal from the travel motor. All of the components in the rotating group must be reinstalled in the component's original location.

Illustration 14

g00626633

17. Turn over the rotating group. Remove shaft assembly (18) from the rotating group.

Illustration 15

g00666621

Illustration 16

g00625900

18. Use a suitable press to remove bearing (19) from shaft assembly (18).

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Illustration 17

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g00666622

19. Use Tooling (E) and a suitable press in order to remove inner race (20) from shaft assembly (18).

Illustration 18

g00625908

20. Remove cam plate (21) from the rotating group.

Illustration 19

g00625911

21. Retainer (22) and piston assemblies (23) are nonserviceable separately. Prior to the removal of the retainer and the piston assemblies from barrel (24), put identification marks on the piston assemblies, the retainer and the barrel for assembly purposes.

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22. The piston assemblies must be reinstalled in the original bores in the retainer and the barrel.

23. Remove retainer (22) and piston assemblies (23) from barrel (24).

24. Separate the piston assemblies from the retainer.

Illustration 20

g00625917

Note: The orientation of the washers (25) is important. The washers must be reinstalled on barrel (24) in the same orientation.

25. Remove guide (26) and outer spacer (27) from barrel (24).

26. Remove washers (25) and inner spacer (28) from the barrel.

Illustration 21

g00625937

27. Remove keys (29) from the travel motor housing.

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Illustration 22

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g00625920

28. Use Tooling (F) to remove retaining ring (30) from the shaft end of the travel motor housing.

Illustration 23

g00625936

Illustration 24

g00636454

29. Use Tooling (G) to remove lip seal (31) from the travel motor housing if the shaft has been removed from the travel motor.

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30. Use Tooling (H) to remove lip seal (31) if the shaft has not been removed from the travel motor. Place the travel motor in a vertical position when you use Tooling (H) to remove the lip type seal.

Illustration 25

g00625976

31. Remove plug (33) and piston (32) from the travel motor housing. Remove O-ring seal (34) from the plug.

Copyright 1993 - 2020 Caterpillar Inc.

Wed Aug 12 00:44:46 UTC+0800 2020

All Rights Reserved.

Private Network For SIS Licensees.

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Shutdown SIS Previous Screen Product: MOBILE HYD POWER UNIT Model: 345C L MOBILE HYD POWER UNIT M3E Configuration: 345C & 345C L Mobile Hydraulic Power Units M3E00001-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 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.

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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 N·m (317 ± 30 lb ft).

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Illustration 2

g01204916

Illustration 3

g01204919

3. Apply a thin coat of Tooling (J) on the outer surfaces of lip seal (31).

4. 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.

5. 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.

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Illustration 5

4/13

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

9. Install inner spacer (28), washers (25), and outer spacer (27) to barrel (24).

10. 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.

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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).

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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.

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Illustration 16

8/13

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.

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Illustration 18

9/13

g00625888

Illustration 19

g00667938

(15) O-Ring seals

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.

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Illustration 20

10/13

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).

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23. Install O-ring seals (13).

Illustration 23

g01204965

24. Use Tooling (G) to drive the bearing into the head.

Illustration 24

g00627405

25. Install O-ring seal (9) onto the head.

26. 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

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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

29. Install an O-ring on each plug (5).

30. Install bolts (4) which hold the head in place. Tighten the six bolts to a torque of 530 ± 70 N·m (391 ± 52 lb ft).

31. Install plugs (5) that hold the pins in the head. Tighten the plugs to a torque of 75 ± 7 N·m (55 ± 5 lb ft).

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Illustration 28

13/13

g00624938

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

Illustration 29

g00627438

33. Install displacement change valve (1) onto the head of the travel motor. Tighten the displacement change valve to a torque of 50 ± 3 N·m (37 ± 2 lb ft).

34. 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.

Wed Aug 12 00:45:42 UTC+0800 2020

All Rights Reserved.

Private Network For SIS Licensees.

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