Usage:
Fluid Spillage Containment
Care must be taken to ensure that the fluids are contained during performance of the inspection, the maintenance, the testing, the adjusting and the repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to the "Tools And Shop Products Guide, NENG2500" the tools and the supplies suitable to collect and contain any of the fluids in Caterpillar machines. Dispose of the fluids according to local regulations and mandates.
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At operating temperature, the hydraulic oil tank is hot and under pressure. Hot oil can cause burns. To prevent possible personal injury, release the pressure in the hydraulic system before any of the hydraulic lines or any of the components are disconnected or removed. |
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1. Release the pressure in all of the implement hydraulic circuits (the boom, the stick and the bucket) before any of the hydraulic lines or any of the components are disconnected or removed, as follows:
a. Fully retract the stick cylinder rod.
b. Adjust the position of the bucket so that it will be flat on the ground when the boom is lowered.
c. Lower the boom until the bucket is flat on the ground.
d. Shut off the engine and place key in the "ON" position. Put the hydraulic activation control lever in the "UNLOCK" position.
e. Move the control levers for the boom, the stick and the swing to all full stroke positions. This will release any pressure that might be present in the pilot system.
f. Return the key to "OFF" position.
g. Slowly loosen the fill plug on the hydraulic tank and release the pressure.
h. Tighten the fill plug on the hydraulic tank. Tighten the fill plug to a torque of 68 ± 7 N*m (50 ± 5 lb ft).
i. The pressure in the hydraulic system has been released and the hydraulic lines and the components can be removed.
2. Drain the oil from the hydraulic oil tank in a suitable container for storage or disposal. The capacity of the hydraulic oil tank is 130 liters (34 U.S. gal).
3. Remove four bolts (1), the washers and access panel (2).
| NOTICE |
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Some of the hose assemblies and the tube assemblies which are connected to the main control valve contain loose components. These components can be lost during the removal and the installation of the main control valve. Use care when disconnecting and connecting the hose assemblies and the tube assemblies to the main control valve. |
4. Put identification marks on all of the hose assemblies, the tube assemblies and the electrical wires that are connected to the main control valve for installation purposes.
5. Disconnect 12 hose assemblies (3) from the top side of the main control valve. Put plugs in the hose assemblies and the main control valve to keep dirt and debris out of the hydraulic system. Disconnect two wires (4) from the main control valve.
6. Remove tube assembly (5) and hydraulic hose (6).
7. Remove 16 hex head bolts (7) to remove tube assembly (8).
8. Remove 11 remaining hydraulic hoses (9) from the front of the main control valve.
9. Install two hex head bolts and cover (10) to prevent loss of parts from the main control valve.
10. Remove hydraulic hose (11) from the left side of the main control valve.
11. Remove air intake hose (15).
12. Remove hydraulic hose (12).
13. Remove four hex head bolts (13) to separate inlet block (14) from the main control valve.
14. Remove two bolts (17), the washers and plate (16).
15. Remove two hydraulic hoses (18).
16. Support the main control valve with a lifting sling and a hoist. The weight of the main control valve is 195 kg (430 lb).
17. Remove hydraulic hose (22) and fitting (23) from the back of the main control valve.
18. Disconnect electrical connector (19).
19. Remove wiring harness clip (20).
20. Remove two hydraulic hoses (24).
21. Remove four mounting bolts (21) and the washers that hold the main control valve in position.
22. Lift main control valve (25) approximately 305 mm (12 in).
23. Remove two hydraulic hoses (26).
24. Remove remaining hydraulic hoses (27) from the bottom of main control valve (25).
| NOTICE |
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Make sure all of the hose assemblies, the tube assemblies and the electrical connections have been disconnected prior to the removal of the main control valve from the machine. |
25. Carefully remove main hydraulic control valve (25) from the machine, the weight of the main control valve is 195 kg (430 lb).
NOTE: The following steps are for the installation of the main control valve.
26. Check the condition of all O-ring seals used in the tube assemblies and hose assemblies that are connected to the main control valve. If any of the O-ring seals are worn or damaged, use new parts for replacement.
NOTE: For the specific torque values of all of the hose assemblies and the tube assemblies that connect to the main control valve, refer to the appropriate "320B, 320B L and 320B N Hydraulic Excavators, Hydraulic System Specifications Manual".
27. Fasten a lifting sling and a hoist to main control valve (25). Lower the main control valve in position until it is approximately 305 mm (12 in) from its mounting position. Connect all hose assemblies (26) and (27) in their original locations on the bottom side of the valve.
28. Lower the main control valve in position, and install four bolts (21) that hold it.
30. Install fitting (23) and hydraulic hose (22) to the back of the main control valve.
31. Install two hydraulic hoses (24).
32. Connect electrical connector (19), and install wiring harness clip (20).
33. Install two hydraulic hoses (18).
34. Install plate (16), two bolts (17) and the washers.
35. Install air intake hose (15).
36. Install hydraulic hose (12).
37. Position inlet block (14) to the main control valve, and install four hex head bolts (13).
38. Install hydraulic hose (11) to the left side of the main control valve.
39. Remove cover (10) from the main control valve.
40. Install tube assembly (5) and hydraulic hose (6).
41. Position tube assembly (8), and install 16 hex head bolts (7).
42. Install 11 hydraulic hoses (9) to the front of the main control valve.
43. Connect 12 hose assemblies (3) to the top side of the main control valve.
44. Connect two wires (4) to the main control valve.
45. Position access panel (2), and install four bolts (1) and the washers.
NOTE: Refer to the topic "Lubricant Viscosities and Refill Capacities" in the "Operation & Maintenance Manual" for the proper filling procedure and the proper levels for the hydraulic oil system.
46. Fill the hydraulic oil tank with oil to the correct level.
| NOTICE |
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When the main hydraulic pump has been serviced or the hydraulic oil has been replaced, the air in the hydraulic system must be removed. No attempt should be made to start the engine until the main hydraulic pump has been filled with oil, or serious damage can be caused to the hydraulic components. To release the pressure from the main hydraulic pump, refer to the topic "Release Of Air From Main Pumps" in the appropriate "320B, 320B L and 320B N Hydraulic Excavators, Hydraulic Systems Testing & Adjusting Manual." |
47. Start the machine, and check the operation of all of the hydraulic controls. Check all of the hose assembly and the tube assembly connections on the main control valve for leaks.
Disassemble & Assemble Main Control Valve
Start By:
a. remove main control valve
Fluid Spillage Containment
Care must be taken to ensure that the fluids are contained during performance of the inspection, the maintenance, the testing, the adjusting and the repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to the "Tools And Shop Products Guide, NENG2500" the tools and the supplies suitable to collect and contain any of the fluids in Caterpillar machines. Dispose of the fluids according to local regulations and mandates.
NOTE: The weight of the main control valve is 195 kg (430 lb).
1. Thoroughly drain any of the remaining oil from the main control valve in a suitable container for storage or disposal.
2. Thoroughly clean the outside of the main control valve prior to disassembling it.
| NOTICE |
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Put identification marks on all components of the main control valve as they are being removed. All of the components must be reinstalled in their original locations. Do Not damage any of the internal parts during the removal. A damaged valve component will result in oil leakage and affect the valve performance. Keep all of the internal parts of the valve clean and lubricated. |
3. Remove and disassemble pressure control valve (2) as follows:
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There is spring force against pressure control valve (2). When four bolts (1) that hold the pressure control valve in place are removed, the spring force will be released. To prevent possible personal injury, hold pressure control valve (2) in place by hand as bolts (1) are being removed. |
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a. While holding pressure control valve (2) in place by hand, slowly remove four bolts (1).
b. Remove pressure control valve (2) from the main valve body.
c. Remove spring (3) from the main valve body.
d. Remove valve assembly (4) from the main valve body.
e. Remove O-ring seals (5) and (6) from the pressure control valve body.
f. Remove five plugs (7) from the pressure control valve body. Remove the O-ring seal from each plug.
g. Remove plug (8).
h. Remove O-ring seal (13) from plug (8).
i. Remove plug (12), spring (11), spool (10) and valve (9) from the valve body.
j. Remove O-ring seal (14) from plug (12).
4. Remove the check valve from the main valve body as follows:
NOTE: Plate (15) is only used for shipping purposes. With the main control valve in the machine, a tube assembly is connected at this location.
a. Remove the four socket head bolts and plate (15) from the main valve body.
b. Remove O-ring seal (16) from plate (15).
c. Remove plate (17) from the main valve body.
d. Remove O-ring seal (18) from plate (17).
e. Remove pilot (19) from the main valve body.
f. Remove spring (20) from the main valve body.
g. Remove check valve (21) from the main valve body.
h. Remove sleeve (22) from the main valve body.
5. Remove six load check valves (23) from the main control valve as follows:
a. Remove six plugs (24).
b. Remove O-ring seal (25) from each plug (24).
c. Remove six springs (26) and six check valves (27) from the main valve bodies.
6. Remove two check valves (28) from the main control valve as follows:
a. Remove two plugs (29) from the main valve body.
b. Remove O-ring seal (31) and back-up ring (30) from each plug.
c. Remove the two springs and two check valves (32) from the main valve body.
7. Remove eight socket head bolts (34) and two plates (35) from the main valve body.
8. Remove O-ring seal (36) from each plate (35).
9. Remove two check valves (37) from the main valve bodies as follows:
a. Remove two plugs (38).
b. Remove O-ring seal (39) from each plug (38).
c. Remove two sleeves (40) from the main valve bodies.
10. Remove check valve (41) from the main valve body as follows:
a. Remove plug (42), spring (43) and check valve (44) from the main valve body.
b. Remove O-ring seal (45) from plug (42).
11. Remove line relief valve (stick cylinder head end) (46), line relief valve (bucket cylinder head end) (47) and line relief valve (boom cylinder rod end) (48) from the main valve bodies.
NOTE: Only the O-ring seals and back-up rings in line relief valves (46), (47) and (48) are serviceable.
12. Disassemble line relief valves (46), (47) and (48) as follows:
a. Remove O-ring seal (49) from the piston.
b. Remove two back-up rings (53) and O-ring seal (50) from the seat.
c. Remove back-up ring (51) and O-ring seal (54) from the valve.
d. Remove O-ring seal (52) from the adapter.
13. Remove plug (55) from the main valve body. Remove O-ring (56) from plug (55).
14. Remove main relief valve (57) from the main valve body.
15. Disassemble main relief valve (57) as follows:
a. Remove nut (58) and adjuster (63) from adapter (64).
b. Remove adapter (64), spring (65) and valve (61) from valve group (62).
c. Remove O-ring seal (60) from adapter (64).
d. Remove O-ring seal (59) from adjuster (63).
e. Disassemble adapter (64).
f. Remove seat (66), spring (70) and valve (67) from adapter (64).
g. Remove O-ring seals (69), (68) and (71) from adapter (64).
h. Remove ring (72), the collar and the filter from valve (67).
16. Remove plug (74) from the main valve body. Remove the O-ring seal from the plug.
17. Remove line relief valve (bucket cylinder rod end) (73) from the main valve body.
NOTE: Only the O-ring seals and the back-up rings in line relief valve (73) are serviceable.
18. Disassemble line relief valve (bucket cylinder rod end) (73) as follows:
a. Remove O-ring seal (75) from the piston.
b. Remove two back-up rings (79) and O-ring seal (76) from the seat.
c. Remove back-up ring (77) and O-ring seal (80) from the valve.
d. Remove O-ring seal (78) from the adapter.
19. Remove two relief valves (81) from the main valve bodies.
20. Disassemble two relief valves (81) as follows:
a. Remove plug (82), spring (83) and valve (84) from valve body (88).
b. Remove O-ring seal (87) and the shims from plug (82).
c. Remove O-ring seal (85) and O-ring seal (86) from valve body (88).
21. Remove plug (89) from the main valve body.
22. Remove O-ring seal (90) from plug (89).
23. Remove straight travel spool assembly (91) from the main valve body.
24. Disassemble straight travel spool assembly (91) as follows:
a. Remove piston (92) from spool (96).
b. Remove plug (95), dowel (94), spring (97) and valve (93) from spool (96).
c. Remove O-ring seal (98) from plug (95).
25. Remove 18 bolts (100) that hold nine housings (99) to the main valve bodies. Remove the nine housing.
26. Remove O-ring seal (101) from each housing (99).
27. Remove boom spool assembly (102), swing spool assembly (103), right travel spool assembly (104), bucket spool assembly (105) and stick spool assembly (106) from the main valve bodies.
28. Remove stick spool assembly (107), left travel spool assembly (108), attachment spool assembly (109) and boom spool assembly (110) from the main valve bodies.
29. Disassemble boom spool assembly (102), swing spool assembly (103), bucket spool assembly (105), stick spool assembly (106), stick spool assembly (107) and attachment spool assembly (109) as follows:
a. Remove bolt (113) and washer (116) from the end of spool (114).
b. Remove retainer (112), spring (115) and retainer (111) from spool (114).
30. Disassemble right travel spool assembly (104) and left travel spool assembly (108) as follows:
a. Remove bolt (120) and washer (119) from the end of spool (121).
b. Remove retainer (123), spring (118), retainer (122) and adapter (117) from spool (121).
c. Remove two O-ring seals (119a) and O-ring seal (118a) from adapter (117).
31. Disassemble boom spool assembly (110) as follows:
a. Remove plug (126), spring (128) and valve (124) from spool (127).
b. Remove O-ring seal (125) from plug (126).
c. Remove bolt (131) and washer (133) from the other end of spool (127).
d. Remove retainer (130), spring (132) and retainer (129) from spool (127).
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There is spring force against valve group (135). When two bolts (134) that hold valve group (135) in position are removed the spring force will be released. To prevent possible personal injury, hold valve group (135) in place by hand as two bolts (134) are being removed. |
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32. While holding valve group (135) in place by hand, slowly remove two bolts (134). Remove valve group (135) from the main valve body.
33. Disassemble valve group (135) as follows:
a. Remove spring (137) and O-ring seal (136) from the valve body.
b. Remove spacer (138) from the valve body.
c. Remove plug (142) and valve (139) from valve body (141).
d. Remove O-ring seal (140) from plug (142).
34. Remove 18 bolts (143) and nine housings (144) from the main valve bodies.
35. Remove O-ring seal (145) from each housing (144).
36. Remove spring (146) for the straight travel spool assembly.
37. Remove seat (147) for the straight travel spool assembly.
38. Remove four plugs (148) from the main valve bodies.
39. Remove O-ring seal (149) from each plug (148).
40. Remove four bolts (152) and washers that hold left main valve body (150) and right main valve body (151) together. Separate the main valve bodies. The approximate weight of each main valve body is 73 kg (160 lb).
41. Remove four large O-ring seals (153) and six small O-ring seals (154) from the left main valve body.
42. Remove plug (155) from each main valve body. Remove the O-ring seal from each plug.
NOTE: The following steps are for the assembly of the main control valve.
| NOTICE |
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Make sure all parts of the main control valve are thoroughly clean and free of dirt and debris. Remove any of the scratches or the burrs from the valve components with polishing paper or an oil stone. Check the condition of all of the O-ring seals, the back-up rings and the springs. If any of the components are worn or damaged, use new parts for replacement. Put clean hydraulic oil on the components of the valve as they are being assembled and installed. Make sure to install all of the parts in their original locations. |
43. Install the O-ring seal on each plug (155). Install the plugs in the main valve bodies as shown. Tighten each plug to a torque of 8 ± 2 N*m (6 ± 1 lb ft).
44. Install four large O-ring seals (153) and six small O-ring seals (154) in the left main valve body.
45. Put right main valve body (151) in position on left main valve body (150). Install four bolts (152) and the washers that hold the main valve bodies together.
46. Install O-ring seal (149) in each plug (148).
47. Install four plugs (148) in the main valve bodies as shown. Tighten each plug to a torque of 35 ± 3 N*m (26 ± 2 lb ft).
48. Install seat (147) for the straight travel spool assembly in the main valve body as shown.
49. Install spring (146) in the seat.
50. Install an O-ring seal (145) in each of nine housings (144).
51. Put nine housings (144) in their original locations on the main valve bodies. Install 18 bolts (143) that hold the housings in position.
52. Assemble valve group (135) as follows:
a. Install O-ring seal (140) on plug (142).
b. Install valve (139) and plug (142) in valve body (141).
c. Install spacer (138) in the valve body.
d. Install O-ring seal (136) and spring (137) in the valve body.
53. Put valve group (135) in position on the main valve body. Compress the spring inside the valve group by hand, and install two bolts (134).
54. Assemble boom spool assembly (110) as follows:
a. Install retainer (129), spring (132) and retainer (130) on spool (127).
b. Install washer (133) and bolt (131). Tighten bolt (131) to a torque of 40 ± 4 N*m (30 ± 3 lb ft).
c. Install O-ring seal (125) on plug (126).
d. Install valve (124), spring (128) and plug (126) in the other end of spool (127).
e. Tighten plug (126) to a torque of 50 ± 7 N*m (37 ± 5 lb ft).
55. Assemble right travel spool assembly (104) and left travel spool assembly (108) as follows:
a. Install two O-ring seals (119a) and O-ring seal (118a) in adapter (117).
b. Install adapter (117), retainer (122), spring (118) and retainer (123) on spool (121).
c. Install washer (119) and bolt (120) in the end of spool (121).
d. For right travel spool assembly (104), tighten bolt (120) to a torque of 40 ± 4 N*m (30 ± 3 lb ft). For left travel spool assembly (108), tighten bolt (120) to a torque of 60 ± 6 N*m (44 ± 4 lb ft).
56. Assemble boom spool assembly (102), swing spool assembly (103), bucket spool assembly (105), stick spool assembly (106), stick spool assembly (107) and attachment spool assembly (109) as follows:
a. Install retainer (111), spring (115) and retainer (112) on spool (114).
b. Install washer (116) and bolt (113) in the end of spool (114).
c. For boom spool assembly (102), swing spool assembly (103) and attachment spool assembly (107), tighten bolt (113) to a torque of 60 ± 6 N*m (44 ± 4 lb ft).
d. For bucket spool assembly (105), stick spool assembly (106) and attachment spool assembly (109), tighten bolt (113) to a torque of 40 ± 4 N*m (30 ± 3 lb ft).
57. Install boom spool assembly (110), attachment spool assembly (109), left travel spool assembly (108) and stick spool assembly (107) in the main valve bodies as shown.
58. Install stick spool assembly (106), bucket spool assembly (105), right travel spool assembly (104), swing spool assembly (103) and boom spool assembly (102) in the main valve bodies.
59. Install an O-ring seal (101) in nine housings (99).
60. Put nine housings (99) in their original locations on the main valve bodies. Install 18 bolts (100) that hold the housings in position.
61. Assemble straight travel spool assembly (91) as follows:
a. Install O-ring seal (98) on plug (95).
b. Install valve (93), spring (97), dowel (94) and plug (95) in spool (96).
c. Tighten plug (95) to a torque of 50 ± 7 N*m (37 ± 5 lb ft).
d. Install piston (92) in spool (96).
62. Install straight travel spool assembly (91) in the main valve body as shown.
63. Install O-ring seal (90) on plug (89).
64. Install plug (89) over the straight travel spool assembly. Tighten the plug to a torque of 285 ± 30 N*m (214 ± 22 lb ft).
65. Assemble two relief valves (81) as follows:
NOTE: Several shims may be used in the end of plug (82). The first shims are thinner than the last shim installed in the plug. The thickest shim must be installed last so it makes contact with the end of spring (83).
a. Install O-ring seal (85) and O-ring seal (86) on valve body (88).
b. Install valve (84) and spring (83) in the valve body as shown.
c. Install O-ring seal (87) and the original amount of shim(s) in plug (82).
66. Install two relief valves (81) in the main valve bodies.
67. Assemble line relief valve (bucket cylinder rod end) (73) as follows:
a. Install O-ring seal (78) on the adapter.
b. Install O-ring seal (80) and back-up ring (77) on the valve in the positions as shown.
c. Install O-ring seal (76) and two back-up rings (79) on the seat.
d. Install O-ring seal (75) on the piston.
e. Assemble the components of the line relief valve.
f. Tighten the seat in the adapter to a torque of 95 ± 10 N*m (70 ± 7 lb ft).
g. Install the locking nut and the hex cap nut on the end of the seat.
h. Adjust the hex cap nut until the distance from the end of the hex cap nut to the mounting face of the adapter is 76 mm (3.0 in). Tighten the locking nut against the hex cap nut to a torque of 61 ± 6 N*m (45 ± 4 lb ft).
68. Install line relief valve (bucket cylinder rod end) (73) in the main valve body. Tighten the line relief valve to a torque of 95 ± 14 N*m (70 ± 10 lb ft).
69. Install the O-ring seal on plug (74). Install plug (74) in the main valve body. Tighten the plug to a torque of 95 ± 14 N*m (70 ± 10 lb ft).
70. Assemble main relief valve (57) as follows:
a. Install the filter, the collar and ring (72) in valve (67).
b. Install O-ring seals (71), (68) and (69) on adapter (64).
c. Assemble adapter (64). Install valve (67), spring (70) and seat (66) in the adapter.
d. Install O-ring seal (59) on adjuster (63).
e. Install O-ring seal (60) on adapter (64).
f. Install valve (61), spring (65) and adapter (64) in valve group (62). Tighten adapter (64) to a torque of 75 ± 10 N*m (55 ± 7 lb ft).
g. Install adjuster (63) in adapter (64).
h. Install nut (58) on the adjuster.
i. After adjustment of the main relief valve, nut (58) is tightened to a torque of 50 ± 10 N*m (37 ± 7 lb ft).
71. Install main relief valve (57) in the main valve body. Tighten the main relief valve to a torque of 135 ± 10 N*m (100 ± 7 lb ft).
72. Install O-ring seal (56) on plug (55).
73. Install plug (55) in the main valve body. Tighten plug (55) to a torque of 95 ± 14 N*m (70 ± 10 lb ft).
74. Assemble line relief valves (46), (47) and (48) as follows:
a. Install O-ring seal (52) on the adapter.
b. Install O-ring seal (54) and back-up ring (51) on the valve in the positions shown.
c. Install O-ring seal (50) and two back-up rings (53) on the seat.
d. Install O-ring seal (49) on the piston.
e. Assemble the components of the line relief valve. Tighten the seat in the adapter to a torque of 95 ± 10 N*m (70 ± 7 lb ft).
f. Install the locking nut and the hex cap nut on the end of the seat.
g. Adjust the hex cap nut until the distance from the end of the hex cap nut to the mounting face of the adapter is 76 mm (3.0 in).
h. Tighten the locking nut against the hex cap nut to a torque of 61 ± 6 N*m (45 ± 4 lb ft).
75. Install line relief valve (stick cylinder head end) (46), line relief valve (bucket cylinder head end) (47) and line relief valve (boom cylinder rod end) (48) in the main valve bodies. Tighten the main relief valves to a torque of 95 ± 14 N*m (70 ± 10 lb ft).
76. Install check valve (41) in the main valve body as follows:
a. Install O-ring seal (45) on plug (42).
b. Install valve (44), spring (43) and plug (42) in the main valve body.
c. Tighten plug (42) to a torque of 200 ± 25 N*m (150 ± 18 lb ft).
77. Install two check valves (37) in the main valve bodies as follows:
a. Install two sleeves (40) in the main valve bodies in the proper orientation shown.
b. Install an O-ring seal (39) on each plug (38).
c. Install two plugs (38) in the main valve bodies. Tighten two plugs (38) to a torque of 200 ± 25 N*m (150 ± 18 lb ft).
78. Install an O-ring seal (36) in each plate (35). Put the two plates in position on the main valve body. Install eight socket head bolts (34).
79. Install two check valves (28) in the main valve body as follows:
a. Install two check valves (32) and two springs (33) in the main valve body.
b. Install back-up rings (30) and O-ring seals (31) on plugs (29) in the positions shown.
c. Install two plugs (29) in the main valve body. Tighten two plugs (29) to a torque of 200 ± 25 N*m (150 ± 18 lb ft).
80. Install six load check valves (23) in the main valve bodies as follows:
a. Install six check valves (27) and six springs (26) in the main valve bodies.
b. Install an O-ring seal on each plug (24).
c. Install six plugs (24) in the main valve bodies. Tighten six plugs (24) to a torque of 200 ± 25 N*m (150 ± 18 lb ft).
81. Install the check valve in the main valve body as follows:
a. Install sleeve (22) in the main valve body in its original orientation as shown.
b. Install check valve (21) in the main valve body in its original orientation as shown.
c. Install spring (20) in the main valve body.
d. Install pilot (19) in the main valve body.
e. Install O-ring seal (18) in plate (17). Put the plate in position on the main valve body.
NOTE: Plate (15) is only used for shipping purposes. With the main control valve in the machine, a tube assembly is connected at this location.
f. Install O-ring seal (16) in plate (15). Put the plate in position on the main valve body. Install the four socket head bolts that hold the plate in position.
82. Assemble pressure control valve (2) as follows:
a. Install O-ring seal (14) on plug (12).
b. Install O-ring seal (8) on plug (13).
c. Install valve (9), spool (10), spring (11) and plug (12) in the pressure control valve body.
d. Install plug (8) in the pressure control valve body.
e. Install an O-ring seal on each plug (7).
f. Install five plugs (7) in the pressure control valve body.
g. Install O-ring seals (5) and (6) in the pressure control valve body.
h. Install valve assembly (4) in the main valve body in the orientation shown.
i. Install spring (3) in valve assembly (4).
j. Put pressure control valve (2) in position on the main valve body. Push down on the pressure control valve, and install four bolts (1) that hold it in place.
End By:
a. install main control valve