9
Section VI
–
Overhaul
CAUTION
Before breaking any circuit connections, be certain
the electrical power is off and all branches of the
circuit are relieved of trapped pressure. Lower all
vertical cylinders. Discharge or isolate accumula-
tors. Block any load whose movement could cause
injury to personnel or damage to the equipment.
A. Disassembly 13.
If a valve fails to function properly, the trouble can often be
corrected without removing the valve from the installation.
This can be accomplished in the following manner.
1. Back off the adjusting screw full length to relieve all
compression on the spring.
2. Remove top cover screws, cover and spring.
3. Check the valve spool for binding or excessive
clearance in the body bore. Be sure the pilot pistons remains
in the bottom cover during the process.
4. If the spool checks out satisfactorily, remove the bottom
cover. Check the pilot piston for burrs or excessive clearance
in the cover bore.
5. Check the bottom cover for clogged control passages.
See Trouble Shooting Table 3.
For complete disassembly (See Figure 4), remove the valve
from the installation. Dismantle in the same order as the key
index numbers assigned to the exploded view.
B. Reassembly 14.
Reassemble in reverse order of disassembly. Follow key
index numbers in Figure 4 in reverse order.
NOTE
In reassembling the valves, the position of the drain
passage in the top cover in relation to the drain
passage in the body, and the position of the control
fluid passage in the bottom cover in relation to the
body passage, determines the type or function of
the valve. See Figure 1 for cover positions.
Figure 3. 15.
1. Adjusting Screw
2. Locknut
3. Cover Screw
4. Cover - Top
5. Plug - Drain Port
6. Seals or Gasket
7. Plug
8. O-Ring
9. Spring
10. Spool
11. Cover Screw
12. Cover - Bottom
13. Seals or Gasket
14. Piston
15. Plug
16. Plug
17. Body - RT Series
18. Body - RCT Series
19. Body - RG Series
20. Body - RCG Series
21. Body - RF Series
22. Body - RCF Series
23. Screw - Mtg.
24. Plate - Mtg.
25. Seal
26. Seal
27. Plug
28. Plug
29. Seal
30. Spring
31. Poppet
32. Seat
33. Neoprene Plug - Used on external
drain models only.
34. Neoprene Plug - Used on remote
control models only.
10
9
8
7
4
3
1
5
2
6
17
18
21-22
32
31
30
29
28
14
12
11
16
15
34
13
23
27
33
19-20
26
24
25
