Caterpillar cat 320 d2 excavator (prefix lma) service repair manual (lma00001 and up)

Service Repair Manual
Models
320D2 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
Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 138-7575 Link Bracket 1
B 1U-9200 Lever Puller Hoist 1
C 138-7573 Link Brackets 2
Start By:
a. Remove the muffler. Refer to Disassembly and Assembly, "Muffler - Remove".
b. Release the hydraulic system pressure. Refer to Disassembly and Assembly, "Hydraulic
System Pressure - Release".
1. Drain the hydraulic tank. Refer to Operations and Maintenance Manual, "Hydraulic System
Oil - Change".
Illustration 1 g01213554
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2020/2/22https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/sisw...

2. Disconnect hose assemblies (4). Disconnect harness assembly (3). Remove bolts (1) and
reposition valve assembly (2).
3. Remove remaining bolts (1).
4. Remove bolts (5) and cover assembly (6).
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5. Remove bolts (9) and bracket assembly (10). Remove cover assembly (12).
6. Disconnect hose assemblies (13). Disconnect harness assembly (14).
7. Disconnect harness assemblies (15) and (20). Disconnect hose assemblies (16), (17), (18),
and (19).
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8. Disconnect hose assembly (21). Disconnect hose assemblies (22).
9. Remove bolts (23). Remove all mounting hardware from harness assembly (24) and
reposition.
10. Disconnect hose assemblies (25).
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11. Remove bolts (26). Disconnect tube assembly (27).
12. Remove bolts (28) and reposition filter assembly (29). Remove bolts (30) and reposition
filter assembly (31).
13. Attach Tooling (A), (B), and (C) and a suitable lifting device to main hydraulic pump (32).
The weight of main hydraulic pump (32) is approximately 250 kg (550 lb). Remove bolts
(33) and main hydraulic pump (32).
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14. Remove bolt (34) and gear (35).
15. Remove bolts (36) and auxiliary pump (37).
16. Remove Coupling (39) and O-ring seal (40). Remove bolts (38) and adapter (41).
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17. Remove bolts (42) and pilot pump (43).
18. Remove O-ring seal (44).
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sat Feb 22 08:39:53 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
Disassembly Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 5F-7465 Puller Group 1
B 1P-2420 Transmission Repair Stand 1
C 138-7575 Link Bracket 3
D 1P-0510 Driver Group 1
E 1P-1859 Retaining Ring Pliers 1
F 9S-9152 Bearing Puller 1
G 8B-7551 Bearing Puller 1
Start By:
A. Remove the main hydraulic pump. Refer to Disassembly and Assembly, "Main Hydraulic
Pump - Remove" for the machine that is being serviced.
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
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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: Cleanliness is an important factor. Before the disassembly procedure, clean the exterior of
the component . Cleaning will prevent dirt from entering the internal mechanism.
Note: Only the right pump control is equipped with the proportional reducing valve. The left
pump control starts with Step 4.
1. Remove bolts (2) , pump control (1) , and fitting (3) .
Right Pump Only
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2. Remove bolts (4) . Remove proportional reducing valve (5) from pump control (1) .
Right Pump Only
3. Remove O-ring seal (9) , O-ring seal (8) , O-ring seal (7) , and O-ring seal (6) from the
proportional reducing valve.
4. Remove nut (10) from the pump control.
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5. Measure the length of screw (13) for installation purposes. Remove screw (13) . Remove
bolts (11) . Remove cover (12) from the pump control.
6. Remove stopper (14) from the pump control.
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7. Remove O-ring seal (15) and backup ring (16) from the stopper.
8. Repeat Step 4 through Step 7 for the other side of the pump control.
9. Place the pump control in a soft jawed vise. Support pin assembly (17) . Remove piston (18)
from the pump control. Remove pin assembly (17) from the pump control.
10. Remove dowel pin (19) from the pin.
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11. Remove bolts (20) . Remove cover assembly (21) from the pump control.
Personal injury can result from parts and/or covers under spring
pressure.
Spring force will be released when covers are removed.
Be prepared to hold spring loaded covers as the bolts are loosened.
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12. Remove O-ring seal (28) . Remove retainer (29) . Remove O-ring seal (27) from the
retainer. Remove nut (23) and nut (25) . Remove setscrew (22) . Remove adjuster (24) .
Remove O-ring seal (26) from the adjuster.
13. Remove spring (30) and spring (31) from the pump control. Remove guide (32) from the
pump control. Remove ball (33) from the guide.
14. Remove pilot piston (34) from the pump control.
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Personal injury can result from parts and/or covers under spring
pressure.
Spring force will be released when covers are removed.
Be prepared to hold spring loaded covers as the bolts are loosened.
15. Remove bolts (35) . Remove cover (36) from the pump control.
16. Remove O-ring seal (37) from the cover.
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17. Remove control piston (42) , spring (41) , spring (40) , spool (39) , and shims (38) from the
pump control.
18. Remove pin (43) from the pump control.
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19. Remove O-ring seal (44) from the pin.
20. Remove sleeve (45) and control linkage (46) from the pump control.
21. Remove slide plate (47) and dowel (48) from the control linkage.
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22. Remove plugs (49) . Remove three plugs (50) from the pump control.
23. Use Tooling (A) to remove seal assembly (52) . Remove bolts (51) , bell housing (53) , and
the gasket.
24. Remove O-ring seal (54) and lip seal (55) from the seal assembly.
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25. Attach Tooling (C) and a suitable lifting device to head (10) . Remove bolts (56) and (57)
and head (58) . The weight of head (58) is approximately 41 kg (90 lb).
26. Remove caps (59) from nipples (62) . Remove nipples (62) , bolts (60) , and covers (61)
from head (58) .
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27. Remove O-ring seal (63) from covers (61) .
28. Use Tooling (D) to remove bearings (64) from the head.
29. Remove plugs (65) and (66) from head (58) .
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30. Remove orifices (67) from head (58) .
31. Remove O-ring seals (68) and (69) from pump housing (72) . Remove port plates (70) and
(71) .
Note: The port plates must be installed in the original position during assembly.
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Caterpillar cat 320 d2 excavator (prefix lma) service repair manual (lma00001 and up)

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Caterpillar cat 320 d2 excavator (prefix lma) service repair manual (lma00001 and up)