308C CR Excavator Hydraulic System – Main Control Valve – Assemble

Assembly Procedure

Note: Inspect all of the O-ring seals prior to assembly of the main control valve. Replace any O-ring seals which are worn or damaged with new O-ring seals.

Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.

Attachment Control Valve (If Equipped)

Illustration 1	g00878426
Two attachment control valves are illustrated.





Illustration 2	g00878612





Illustration 3	g00878874




Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.



1. Install seats (19), spring (18), and rod (20) on spool (17). Tighten rod (20) to a torque of 21 ± 2 N·m (15 ± 1 lb ft).

2. Install the assembled components into housing (9) .

3. Install O-ring seals (16) in covers (14) and (15). Secure covers (14) and (15) with the bolts. Tighten the bolts to a torque of 10.8 ± 1.0 N·m (95.59 ± 8.85 lb in).

Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.



4. Install O-ring seal (10) on plug (12). Install spring (11), valve (13), plug (12), and O-ring seal (10). Tighten plug (12) to a torque of 93 ± 5 N·m (69 ± 4 lb ft).

5. Install two relief valves (8) in housing (9). Tighten the relief valves to a torque of 64 ± 5 N·m (47 ± 4 lb ft).

Illustration 4	g00878651

6. Install O-ring seals (4), (5), (6), and (7) .

7. Install attachment control valves (1) and (1A), and install cover (2). Secure the components with bolts (3). Tighten the bolts to a torque of 61 ± 4 N·m (45 ± 3 lb ft).

Main Control Valve

Stick 1 Valve

Illustration 6	g00878435





Illustration 7	g00885668




Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.



1. Assemble seats (29) and spring (30) on spool (28). Install rod (31) and tighten rod (31) to a torque of 21 ± 2 N·m (15 ± 1 lb ft).

2. Install the assembled components in housing (1) .

3. Install O-ring seals (27) in covers (26) and (32). Position covers (26) and (32) on the housing and secure the covers with the bolts. Tighten the bolts to a torque of 10.8 ± 1.0 N·m (95.59 ± 8.85 lb in).

Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.



4. Assemble seats (21) and spring (25) on spool (23). Install rod (22) and tighten rod (22) to a torque of 21 ± 2 N·m (15 ± 1 lb ft).

5. Install the assembled components in housing (1) .

6. Install O-ring seals (20) in covers (19) and (24). Position covers (19) and (24) on the housing and secure the covers with the bolts. Tighten the bolts to a torque of 10.8 ± 1.0 N·m (95.59 ± 8.85 lb in).

Illustration 8	g00878939




Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.



7. Install O-ring seal (18) on plug (17). Install spring (16) and valve (15) .

8. Install plug (17) and seal (18). Tighten the plug to a torque of 93 ± 5 N·m (69 ± 4 lb ft).

9. Install relief valve (14) in housing (1). Tighten the relief valve to a torque of 64 ± 5 N·m (47 ± 4 lb ft).

10. Install O-ring seal (9) on plug (10) .

Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.



11. Install valve (7 ) and spring (8). Install sleeve (13), valve (12), and spring (11) .

12. Install O-ring seal (9) and plug (10). Tighten plug (10) to a torque of 182 ± 15 N·m (134 ± 11 lb ft).

13. Install O-ring seal (9) on plug (10) .

14. Install ring (4), O-ring seal (5), and spacer (6) in the housing. Install O-ring seals (3). Install plate (2) and secure the plate with the bolts. Tighten the bolts to a torque of 10.8 ± 1.0 N·m (95.59 ± 8.85 lb in).

Swing Valve

Illustration 9	g00878927




Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.



1. Assemble seats (12) and spring (8) on spool (10). Install rod (9) and tighten the rod to a torque of 21 ± 2 N·m (15 ± 1 lb ft).

2. Install the assembled components in the housing.

3. Install O-ring seals (7) in covers (6) and (11). Position covers (6) and (7) on the housing and secure the covers with the bolts. Tighten the bolts to a torque of 10.8 ± 1.0 N·m (95.59 ± 8.85 lb in).

4. Install O-ring seal (2) on plug (3) .

Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.



5. Install spring (4) and valve (5).

6. Install plug (3) and O-ring seal (2). Tighten the plug to a torque of 93 ± 5 N·m (69 ± 4 lb ft).

7. Install relief valve (1). Tighten relief valve (1) to a torque of 64 ± 5 N·m (47 ± 4 lb ft).

8. Install relief valve (13). Tighten relief valve (13) to a torque of 54 ± 5 N·m (40 ± 4 lb ft).

Travel

Illustration 10	g00887181