Caterpillar cat 320 d2 l excavator (prefix stn) service repair manual (stn00001 and up)

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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2020/1/11https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...

Illustration 1 g00705445
1. Install O-ring seal (45) onto the fitting (44).
2. Install fitting (44) into the motor housing.
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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Typical Example
4. Use Tooling (E) to install bearing (42) into the motor housing.
5. Raise the temperature of bearing race (41). Install the bearing race on the shaft.
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6. Raise the temperature of bearing race (40). Install the bearing race on the shaft.
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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8. Use Tooling (B) to install retaining ring (38) onto shaft (39). Remove the shrink wrap
tubing.
9. Install swashplate (37) into the motor housing.
Typical Example
10. Install O-ring seals (36) and (36a) into the motor housing.
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11. Connect plates (34) and (35).
12. Install pistons (33) into plates (34) and (35).
13. Install pistons (33) into barrel (32).
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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.
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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16. Install piston (30) into the motor housing.
17. Install port plate (29) into the motor housing. Install springs (28) into the motor housing.
18. Install spring pins (26) and bearing (27) into the head.
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19. Install O-ring seal (25) onto the head.
20. Install O-ring seal (23) and O-ring seal (24) onto the fittings (19) and (20).
21. Install O-ring seal (22) onto the plug (21).
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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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.
24. Install port plate (29) onto the head.
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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.
25. Install springs (28) onto the piston. Install head (1) onto the motor housing.
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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27. Install O-ring seals (10), (12), and (13). Install back up rings (9) and (11).
28. Install relief valves (8) into the head.
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29. Install dipstick tube (5) and breather tube (6) into motor housing (7).
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

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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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).
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).
3/7(W)w

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.
8. Connect hose assembly (19).
10. Install the split flanges, the washers and bolts (15).
13. Install the split flanges, the washers, and bolts (14).
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16. Connect harness assembly (18).
17. Install the clip, the washer, and bolt (17).
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).
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

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.
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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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

Caterpillar cat 320 d2 l excavator (prefix stn) service repair manual (stn00001 and up)

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