Single-Spool Valve Repair - Bolens DuraTrac DGT 1800 Service Manual

5100 SERIES
TRACTOR
PAGE 6·10 Rev. 3192
SINGLE-SPOOL VALVE REPAIR
MODEL 5118H
REPAIRING THE HYDRAULIC
CONTROL VALVE (SINGLE
SPOOL VALVE, FIG. 6-8)
The hydraulic control valve regulates
and changes the direction of oil flow
to the hydraulic cylinder when the
control lever is actuated. "Lip Seals"
are used on the spool to provide a
seal in the bore.
Replacement lip seals are available
for the control valve. Order.Bolens
part# 1754414.
DISASSEMBLY
The spool is matched to the bore in
the valve body. If the spool or valve
body is damaged the complete valve
Fig, 6-8
assembly must be replaced.
To remove the spool from the valve,
remove the capscrew in the end of
the spool, and flat washer. Remove
the spool by pulling it out of the lever
end of the valve body.
Small burrs and scratches can be
removed from the spool with fine
emery cloth. Clean all parts before
assembly.
ASSEMBLY
1 .
·1 nstall new lip seal rings onto the
spool with the opening towards
the inside of spool.
2.
Lubricate seals and insert spool
with seals into valve body. Be
SINGLE SPOOL VALVE
careful not to damage seals.
Install the spool into the valve
body from the lever end. This
end has a chamfer in the bore
which is a lead for the packings.
3. Secure spool with round head
screw, lock washer and flat
washer.
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RELIEF VALVE ASSEMBLY
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