Service Manual

Lift Valve Repair
1. After removing control valve, wash valve in solvent
and dry thoroughly.
2. Carefully mount control valve in a vise so that control
valve mounting pads are against jaws of vise.
Control
valve spool snap ring (Item 15) should be facing up.
3. Remove hex cap plug (Item 1) from side of valve body
.
Inside valve body, behind each hex cap plug, there is a
spring (Item 3), ball (Item 4) and cam pin (Item 6); re-
move these parts.
4. Remove snap ring (Item 15) from spool (Item 8).
Carefully push and twist spool to remove from valve
body
.
5. Use a hooked scribe or thin screwdriver to remove o–
rings from inside bore of valve body (be careful not to
scratch valve bore finish). These o
–rings are the seals
for the spool. Inspect all components for wear, paying
special attention to the spool. Signs of wear on one side
of the spool may indicate a bent spool. Inspect the spool
for flatness and replace if necessary.
6. Use new o–
rings when reassembling. Before reas-
sembly, coat all o–rings with clean hydraulic oil. Install
spool into valve body before inserting cam pins, balls,
springs and hex plugs.
1
2
3
4
5
6
7
8
9
9
10
11
12
10
13
14
Figure 21
1. Plug 8. Spool
2. O–ring 9. O
–ring
3. Spring 10. Spring retainer
4. Ball 1
1. Spring
5. Check valve seat 12. Spacer
6. Cam pin 13. Spool retaining ring
7. Body 14. Retaining ring
Hydraulic System Page 9 – 24 Workman 3000/4000 Series