Page 4 – 50Hydraulic System
Sand Pro & Infield Pro 3040/5040
Lift Control Valve Service
Disassembly (Fig. 42)
1. Wash lift valve in solvent and dry thoroughly.
2. Carefully mount lift valve in a vise so that mounting
pads are against jaws of vise. Lift valve spool retaining
ring (item 14) should be facing up.
3. Remove two (2) hex cap plugs (item 1) from side of
valve body. Inside valve body, behind each hex cap
plug, there is a spring (item 3), check ball (item 4) and
cam pin (item 6); remove these parts.
NOTE: Remove check ball seats (item 5) only if they
need replacement; the seats are press fit into the valve
body.
4. Remove retaining ring (item 14) from spool (item 8).
Remove spool retaining ring (item 13), spring retainer
(item 10), spacer (item 12), spring (item 11) and second
spring retainer (item 10). Carefully push and twist spool
to remove spool from valve body.
5. Use a hooked scribe or thin screwdriver to remove o–
rings (item 9) from inside bore of valve body (be careful
not to scratch valve bore finish). These o–rings are the
seals for the spool.
6. 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.
Assembly (Fig. 42)
1. Clean all components thoroughly before assembly.
Use new o–rings when assembling.
2. Coat all o–rings and spool with clean hydraulic oil be-
fore installation into valve body. Assemble components
in reverse order of disassembly. Install spool into valve
body before inserting cam pins, check balls, springs and
hex cap plugs.
1. Hex cap plug (2 used)
2. O–ring (2 used)
3. Spring (2 used)
4. Check ball (2 used)
5. Check ball seat (2 used)
6. Cam pin (2 used)
7. Valve body
8. Spool
9. O–ring
10. Spring retainer
11. Spring
12. Spacer
13. Spool retaining ring
14. Retaining ring
Figure 42
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2
3
4
5
6
7
8
9
10
11
12
13
14
10
9
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