120H and 135H Motor Graders Machine Systems Bank Valve - Disassemble - Bank Valve with Hydraulic Detent Caterpillar

Disassembly Procedure

Start By:

1. Remove the bank valves.

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Illustration 1	g00917643
Control Valve with Hydraulic Detent

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Illustration 2	g00636261

1. For assembly purposes, put identification marks on cover (2), valves (5), and manifold (4) to identify the location of the components. Remove bolts (1) and remove cover (2) from the bank valve.
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   Illustration 3	g00636262

2. Remove bolts (3) and remove manifold (4) from the bank valve.
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   Illustration 4	g00636265

   Note: The number of valves that are on the machine may vary. The number of valves depends on the number of implements that are on the machine.

3. Separate individual valves (5) and separate seal plates (6) from the unit.
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   Illustration 5	g00918045

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   Illustration 6	g00917801
   Section View of Control Valve Detent

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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.

4. Remove bolts (7) and remove control valve detent (11) from valve body (5). Remove plug (8) and the O-ring seal from control valve detent (11). Remove plug (10) and the O-ring seal from control valve detent (11).

5. Remove spring (19) from retainer (21). Remove spacer (9) and O-ring (23) from control valve detent (11). Remove O-ring seal (22) from control valve detent (11).

6. Remove plug (24) and O-ring seal (25) from control valve detent (11). Remove ball (26).

7. Remove plug (12) and O-ring seal (13) from control valve detent (11). Remove piston (14). Remove retainer (21).
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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.

8. With a suitable press, compress detent springs (16) and (17) by pressing on retainer (20). Remove six balls (18) and remove retainer (20), spring , (16), and spring (17) from retainer (21).
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   Illustration 7	g00918328

9. Remove bolts (29) and remove control assembly (32) from valve body (5).

10. Remove bolts (31) and remove cover (30) from control assembly (32).
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    Illustration 8	g00918312

11. Remove O-ring seal (34) and remove lever (35) from lever assembly (37). Remove O-ring seal (33). Remove stem (39) from control assembly (32).

12. Remove lever assembly (37) from control assembly (32). Remove O-ring seals (36) and backup rings (38) from lever assembly (37).
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    Illustration 9	g00918472

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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.

13. With a suitable press, compress spring (41). Remove retainers (42) from stem (39). Remove detent (40) from stem (39).
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    Illustration 10	g00918674

14. Remove relief valve (43) from valve body (5). Remove O-ring seal (44) and O-ring seal (45) from relief valve (43). Remove nut (47). Remove cap (50) and remove adjuster (51). Remove O-ring seal (46) from the adjuster. Remove spring (49) and valve (48).
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    Illustration 11	g00918788

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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.

15. Plug (52) may be under spring pressure. Hold plug (52) firmly when the plug is loosened. Slowly remove plug (52) from the valve. Remove the O-ring seal (53) from plug (52). Remove spring (54) and valve (55) from valve body (5).
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    Illustration 12	g00918814

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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.

16. Remove seat (57) and piston (59) from valve body (5). Remove O-ring seal (58) from seat (57).
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    Illustration 13	g00919164

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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.

17. Remove plug (60) from valve body (5). Remove O-ring seal (61) from the plug. Slowly remove plug (62) from valve body (5). Remove spring (63) and valve (64) from valve body (5).

18. Remove plug (69) from valve body (5). Remove O-ring seal (67) from the plug.

19. Slowly remove plug (70) from valve body (5). Remove O-ring seal (68) from the plug. Remove spring (66) and ball (65) from valve body (5).