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Service Repair Manual
Models
320D2 and 320D2 L Excavator
S/N - TMF1-UP
S/N - WDJ1-UP
S/N - XAN1-UP
S/N - XBB1-UP
S/N - XCC1-UP
S/N - YEA1-UP
S/N - ZBD1-UP
S/N - ZCS1-UP
Assembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
B 1P-1859 Retaining Ring Pliers 1
E 1P-0510 Driver Group 1
F 1U-6396 O-Ring Assembly Compound
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. 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-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 (F) during the assembly procedure.
Note: Apply a light film of hydraulic oil to all components before assembly.
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Illustration 1 g00705445
1. Install O-ring seal (45) onto the fitting (44).
Illustration 2 g00705442
2. Install fitting (44) into the motor housing.
Illustration 3 g00705441
3. Lubricate the lip seal (43) with clean hydraulic oil. install lip seal (43) into the motor
housing with the lip toward the inside of the motor housing.
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Illustration 4 g01022013
Typical Example
Illustration 5 g01287176
4. Use Tooling (E) to install bearing (42) into the motor housing.
Illustration 6 g00705595
5. Raise the temperature of bearing race (41). Install the bearing race on the shaft.
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Illustration 7 g00705592
6. Raise the temperature of bearing race (40). Install the bearing race on the shaft.
Illustration 8 g00705597
Illustration 9 g00705258
7. Install shrink wrap tubing onto shaft (39). The shrink wrap tubing will protect the seal
during installation of shaft (39). Install shaft (39) into the motor housing.
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Illustration 10 g00705602
8. Use Tooling (B) to install retaining ring (38) onto shaft (39). Remove the shrink wrap
tubing.
Illustration 11 g00705209
9. Install swashplate (37) into the motor housing.
Illustration 12 g01021919
Typical Example
10. Install O-ring seals (36) and (36a) into the motor housing.
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Illustration 13 g01021909
11. Connect plates (34) and (35).
Illustration 14 g01021903
12. Install pistons (33) into plates (34) and (35).
Illustration 15 g01021898
13. Install pistons (33) into barrel (32).
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Illustration 16 g01022034
14. Install barrel (32) and the piston assembly into the motor housing as one unit. It may be
necessary to use string to keep the barrel and the piston assembly together during
installation.
Illustration 17 g01022038
Note: Make sure that the tooth cut locations of each friction plate are in alignment. Also, the
tooth cut locations of each separator plate must be in alignment in the body of the swing
motor.
15. Apply clean hydraulic oil on four separator plates and three friction plates (31). Install
plates (31) in alternating order in the body of the swing motor. Begin with a separator plate,
and end with a separator plate.
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Illustration 18 g01021875
16. Install piston (30) into the motor housing.
Illustration 19 g00704796
17. Install port plate (29) into the motor housing. Install springs (28) into the motor housing.
Illustration 20 g00704771
18. Install spring pins (26) and bearing (27) into the head.
Illustration 21 g00704754
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19. Install O-ring seal (25) onto the head.
Illustration 22 g00704749
20. Install O-ring seal (23) and O-ring seal (24) onto the fittings (19) and (20).
Illustration 23 g00704743
21. Install O-ring seal (22) onto the plug (21).
Illustration 24 g00704741
22. Install tee fitting (19), fitting (20), and plugs (21) into the head. Tighten plugs (21) to a
torque of 59 ± 6 N·m (44 ± 4 lb ft).
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Illustration 25 g00704734
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.
23. Install spool valve (15), spring (16), O-ring seal (17), and plug (18) into the head. Tighten
plug (18) to a torque of 334 ± 33 N·m (246 ± 24 lb ft). Repeat for the opposite side.
Illustration 26 g00705818
24. Install port plate (29) onto the head.
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Illustration 27 g00705827
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.
25. Install springs (28) onto the piston. Install head (1) onto the motor housing.
Illustration 28 g00704719
26. Install bolts (14) into the head. Tighten bolts (14) to a torque of 430 ± 43 N·m
(317 ± 32 lb ft).
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Illustration 29 g00704710
27. Install O-ring seals (10), (12), and (13). Install back up rings (9) and (11).
Illustration 30 g00704704
28. Install relief valves (8) into the head.
Illustration 31 g00704621
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29. Install dipstick tube (5) and breather tube (6) into motor housing (7).
Illustration 32 g00704611
30. Install mounting bolts (4). Install anti-reaction valve (3) into head (1). Install bolts (2).
End By:
a. Install the swing motor. Refer to Disassembly and Assembly, "Swing Motor - Install".
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sat Jan 11 14:30:58 UTC+0800 2020
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S/N - TMF1-UP
S/N - WDJ1-UP
S/N - XAN1-UP
S/N - XBB1-UP
S/N - XCC1-UP
S/N - YEA1-UP
S/N - ZBD1-UP
S/N - ZCS1-UP
Installation Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A FT-2674 Vacuum Cap 1
B 138-7573 Link Bracket 2
C 1U-8846 Gasket Sealant
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.
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. Prior to the installation of the swing motor, make sure that the mating surfaces of the swing
motor and the swing drive are thoroughly clean and dry.
2. Apply Tooling (C) on the mating surface of the swing motor and the swing drive housing.
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Illustration 1 g00694494
3. Attach Tooling (B) and a suitable lifting device to swing motor (23). The weight of swing
motor (23) is approximately 55 kg (120 lb).
Illustration 2 g00694484
4. Install the washers and bolts (20).
5. Tighten bolts (20) to a torque of 240 ± 40 N·m (177 ± 30 lb ft).
6. Install anti-reaction valve (22). Install the washers and bolts (21). Tighten bolts (21) to a
torque of 55 ± 10 N·m (40 ± 7 lb ft).
Illustration 3 g00690963
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7. Remove the cap to the hydraulic tank. Attach Tooling (A) to the hydraulic tank.
Note: Hook up the air to Tooling (A) in order to create a vacuum in the hydraulic system.
This will minimize the leakage from the hose assemblies.
Note: Replace the O-ring seals that are used in the ends of the hose assemblies.
Illustration 4 g00695023
8. Connect hose assembly (19).
Illustration 5 g00694470
9. Connect hose assembly (13).
10. Install the split flanges, the washers and bolts (15).
11. Connect hose assembly (16).
12. Connect hose assembly (11).
13. Install the split flanges, the washers, and bolts (14).
14. Connect hose assembly (12).
15. Connect hose assembly (10).
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16. Connect harness assembly (18).
17. Install the clip, the washer, and bolt (17).
Illustration 6 g00694459
Typical example
18. Connect hose assembly (7) (If Equipped).
19. Install hose assembly (6) (If Equipped).
20. Install brace (8) with washers and bolts (9) (If Equipped).
Illustration 7 g00694353
21. Make sure that the drain valve (5) is closed.
22. Remove Tooling (A) and install the cap to the hydraulic tank.
NOTICE
To avoid system damage, make sure that the hydraulic motor is
properly filled with hydraulic oil before start-up.
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23. Install high efficiency filters in place of the pilot filter, the case drain filter, and the return
filter.
Note: High efficiency filters should not be run for more than 250 hours before you change
back to the standard filters.
24. Fill the hydraulic oil tank and the swing drive with clean hydraulic oil to the correct level.
Reference: Refer to Operation and Maintenance Manual, "Lubricant Viscosities" for the
proper oil viscosity.
Reference: Refer to Operation and Maintenance Manual, "Hydraulic System Oil Level -
Check" and Operation and Maintenance Manual, "Swing Drive Oil Level - Check" for the
correct filling procedures.
25. Start the engine, and check the operation of the swing drive. Also, check for leaks. Stop the
engine.
26. Obtain a hydraulic oil sample from the main S·O·S port.
Reference: Refer to Operation and Maintenance Manual, "Sampling Interval and Location
of Sampling Valve" for the correct location.
27. If the S·O·S sample exceeds ISO 18/15, flush the hydraulic system.
Reference: Refer to Contamination Control Guidelines, SEBF8436, "Hydraulic System
Flushing Procedure for 320C Hydraulic Excavators" for further information.
Illustration 8 g00694245
28. Install the washers and bolts (4) in order to install access cover (3) that is under the main
control valve.
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Illustration 9 g00950370
29. Install the washers and bolts (1) in order to install cover (2).
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sat Jan 11 14:31:54 UTC+0800 2020
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  • 2. S/N - TMF1-UP S/N - WDJ1-UP S/N - XAN1-UP S/N - XBB1-UP S/N - XCC1-UP S/N - YEA1-UP S/N - ZBD1-UP S/N - ZCS1-UP Assembly Procedure Table 1 Required Tools Tool Part Number Part Description Qty B 1P-1859 Retaining Ring Pliers 1 E 1P-0510 Driver Group 1 F 1U-6396 O-Ring Assembly Compound 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. 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-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 (F) during the assembly procedure. Note: Apply a light film of hydraulic oil to all components before assembly. 2/14(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 3. Illustration 1 g00705445 1. Install O-ring seal (45) onto the fitting (44). Illustration 2 g00705442 2. Install fitting (44) into the motor housing. Illustration 3 g00705441 3. Lubricate the lip seal (43) with clean hydraulic oil. install lip seal (43) into the motor housing with the lip toward the inside of the motor housing. 3/14(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 4. Illustration 4 g01022013 Typical Example Illustration 5 g01287176 4. Use Tooling (E) to install bearing (42) into the motor housing. Illustration 6 g00705595 5. Raise the temperature of bearing race (41). Install the bearing race on the shaft. 4/14(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 5. Illustration 7 g00705592 6. Raise the temperature of bearing race (40). Install the bearing race on the shaft. Illustration 8 g00705597 Illustration 9 g00705258 7. Install shrink wrap tubing onto shaft (39). The shrink wrap tubing will protect the seal during installation of shaft (39). Install shaft (39) into the motor housing. 5/14(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 6. Illustration 10 g00705602 8. Use Tooling (B) to install retaining ring (38) onto shaft (39). Remove the shrink wrap tubing. Illustration 11 g00705209 9. Install swashplate (37) into the motor housing. Illustration 12 g01021919 Typical Example 10. Install O-ring seals (36) and (36a) into the motor housing. 6/14(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 7. Illustration 13 g01021909 11. Connect plates (34) and (35). Illustration 14 g01021903 12. Install pistons (33) into plates (34) and (35). Illustration 15 g01021898 13. Install pistons (33) into barrel (32). 7/14(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 8. Illustration 16 g01022034 14. Install barrel (32) and the piston assembly into the motor housing as one unit. It may be necessary to use string to keep the barrel and the piston assembly together during installation. Illustration 17 g01022038 Note: Make sure that the tooth cut locations of each friction plate are in alignment. Also, the tooth cut locations of each separator plate must be in alignment in the body of the swing motor. 15. Apply clean hydraulic oil on four separator plates and three friction plates (31). Install plates (31) in alternating order in the body of the swing motor. Begin with a separator plate, and end with a separator plate. 8/14(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 9. Illustration 18 g01021875 16. Install piston (30) into the motor housing. Illustration 19 g00704796 17. Install port plate (29) into the motor housing. Install springs (28) into the motor housing. Illustration 20 g00704771 18. Install spring pins (26) and bearing (27) into the head. Illustration 21 g00704754 9/14(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 10. 19. Install O-ring seal (25) onto the head. Illustration 22 g00704749 20. Install O-ring seal (23) and O-ring seal (24) onto the fittings (19) and (20). Illustration 23 g00704743 21. Install O-ring seal (22) onto the plug (21). Illustration 24 g00704741 22. Install tee fitting (19), fitting (20), and plugs (21) into the head. Tighten plugs (21) to a torque of 59 ± 6 N·m (44 ± 4 lb ft). 10/14(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 11. Illustration 25 g00704734 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. 23. Install spool valve (15), spring (16), O-ring seal (17), and plug (18) into the head. Tighten plug (18) to a torque of 334 ± 33 N·m (246 ± 24 lb ft). Repeat for the opposite side. Illustration 26 g00705818 24. Install port plate (29) onto the head. 11/14(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 12. Illustration 27 g00705827 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. 25. Install springs (28) onto the piston. Install head (1) onto the motor housing. Illustration 28 g00704719 26. Install bolts (14) into the head. Tighten bolts (14) to a torque of 430 ± 43 N·m (317 ± 32 lb ft). 12/14(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 13. Illustration 29 g00704710 27. Install O-ring seals (10), (12), and (13). Install back up rings (9) and (11). Illustration 30 g00704704 28. Install relief valves (8) into the head. Illustration 31 g00704621 13/14(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 14. 29. Install dipstick tube (5) and breather tube (6) into motor housing (7). Illustration 32 g00704611 30. Install mounting bolts (4). Install anti-reaction valve (3) into head (1). Install bolts (2). End By: a. Install the swing motor. Refer to Disassembly and Assembly, "Swing Motor - Install". Copyright 1993 - 2020 Caterpillar Inc. All Rights Reserved. Private Network For SIS Licensees. Sat Jan 11 14:30:58 UTC+0800 2020 14/14(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 15. S/N - TMF1-UP S/N - WDJ1-UP S/N - XAN1-UP S/N - XBB1-UP S/N - XCC1-UP S/N - YEA1-UP S/N - ZBD1-UP S/N - ZCS1-UP Installation Procedure Table 1 Required Tools Tool Part Number Part Description Qty A FT-2674 Vacuum Cap 1 B 138-7573 Link Bracket 2 C 1U-8846 Gasket Sealant 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. 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. Prior to the installation of the swing motor, make sure that the mating surfaces of the swing motor and the swing drive are thoroughly clean and dry. 2. Apply Tooling (C) on the mating surface of the swing motor and the swing drive housing. 2/7(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 16. Illustration 1 g00694494 3. Attach Tooling (B) and a suitable lifting device to swing motor (23). The weight of swing motor (23) is approximately 55 kg (120 lb). Illustration 2 g00694484 4. Install the washers and bolts (20). 5. Tighten bolts (20) to a torque of 240 ± 40 N·m (177 ± 30 lb ft). 6. Install anti-reaction valve (22). Install the washers and bolts (21). Tighten bolts (21) to a torque of 55 ± 10 N·m (40 ± 7 lb ft). Illustration 3 g00690963 3/7(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 17. 7. Remove the cap to the hydraulic tank. Attach Tooling (A) to the hydraulic tank. Note: Hook up the air to Tooling (A) in order to create a vacuum in the hydraulic system. This will minimize the leakage from the hose assemblies. Note: Replace the O-ring seals that are used in the ends of the hose assemblies. Illustration 4 g00695023 8. Connect hose assembly (19). Illustration 5 g00694470 9. Connect hose assembly (13). 10. Install the split flanges, the washers and bolts (15). 11. Connect hose assembly (16). 12. Connect hose assembly (11). 13. Install the split flanges, the washers, and bolts (14). 14. Connect hose assembly (12). 15. Connect hose assembly (10). 4/7(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 18. Thank you very much for your reading. Please Click Here. Then Get COMPLETE MANUAL. NO WAITING NOTE: If there is no response to click on the link above, please download the PDF document first and then click on it.
  • 19. 16. Connect harness assembly (18). 17. Install the clip, the washer, and bolt (17). Illustration 6 g00694459 Typical example 18. Connect hose assembly (7) (If Equipped). 19. Install hose assembly (6) (If Equipped). 20. Install brace (8) with washers and bolts (9) (If Equipped). Illustration 7 g00694353 21. Make sure that the drain valve (5) is closed. 22. Remove Tooling (A) and install the cap to the hydraulic tank. NOTICE To avoid system damage, make sure that the hydraulic motor is properly filled with hydraulic oil before start-up. 5/7(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 20. 23. Install high efficiency filters in place of the pilot filter, the case drain filter, and the return filter. Note: High efficiency filters should not be run for more than 250 hours before you change back to the standard filters. 24. Fill the hydraulic oil tank and the swing drive with clean hydraulic oil to the correct level. Reference: Refer to Operation and Maintenance Manual, "Lubricant Viscosities" for the proper oil viscosity. Reference: Refer to Operation and Maintenance Manual, "Hydraulic System Oil Level - Check" and Operation and Maintenance Manual, "Swing Drive Oil Level - Check" for the correct filling procedures. 25. Start the engine, and check the operation of the swing drive. Also, check for leaks. Stop the engine. 26. Obtain a hydraulic oil sample from the main S·O·S port. Reference: Refer to Operation and Maintenance Manual, "Sampling Interval and Location of Sampling Valve" for the correct location. 27. If the S·O·S sample exceeds ISO 18/15, flush the hydraulic system. Reference: Refer to Contamination Control Guidelines, SEBF8436, "Hydraulic System Flushing Procedure for 320C Hydraulic Excavators" for further information. Illustration 8 g00694245 28. Install the washers and bolts (4) in order to install access cover (3) that is under the main control valve. 6/7(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...
  • 21. Illustration 9 g00950370 29. Install the washers and bolts (1) in order to install cover (2). Copyright 1993 - 2020 Caterpillar Inc. All Rights Reserved. Private Network For SIS Licensees. Sat Jan 11 14:31:54 UTC+0800 2020 7/7(W) w 2020/1/11 https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...