2000 SRM 1233
Main Control Valve, Section 2 of Hydraulic Plate
NOTE:
Do not try to repair a relief valve. Replace
the relief valve if it is damaged or cannot be properly
adjusted.
NOTE:
For the spool designation, each spool has a im-
printed letter code to facilitate identification during
tuning or servicing the field.
CLEAN AND INSPECT
WARNING
Cleaning solvents can be flammable and toxic
and can cause skin irritation.
When using
cleaning solvents, always follow the solvent
manufacturer’s recommended safety precau-
tions.
Compressed air can move particles and cause
injury to the user or to other personnel. Make
sure compressed air path is away from all per-
sonnel. Wear eye protection.
1.
Clean all parts of control valve with solvent.
Carefully dry parts with compressed air.
2.
Check spools and bores for defects. If a spool or
bore has damage, replace valve section that has
the damaged part or parts. Make sure that bores
and grooves for O-rings are smooth and do not
have dirt or defects.
3.
Check the check valves and relief valves for dam-
age. Replace valves as necessary.
ASSEMBLE
Auxiliary Section
CAUTION
Before installing parts in valve body, make
sure all parts are clean. Replace all seals and
O-rings.
Lubricate all parts with clean hy-
draulic oil during assembly.
CAUTION
Verify that nuts and bolts torque specifications
are to the values listed. Incorrect torque values
may cause a malfunction of the spools.
1.
Install new seals in bore in each section. See
Figure 10.
2.
Install new O-rings between sections.
3.
Install check valves.
CAUTION
When positioning the sections, do not damage
the O-rings.
4.
Carefully position the auxiliary section in line
with the lift section.
5.
Install nuts, finger tight, on the four bolts.
6.
Torque the four nuts to 80 N•m (59 lbf ft).
7.
Install springs.
8.
Lubricate spools with clean hydraulic oil. Make
sure that dirt does not get on any of the parts.
Carefully install spools in valve body. Make sure
that spools move freely in bores. Install seal re-
tainers and end caps.
Lift Section
CAUTION
Before installing parts in valve body, make
sure all parts are clean. Replace all seals and
O-rings.
Lubricate all parts with clean hy-
draulic oil during assembly.
CAUTION
Verify that bolt torque specifications are to
the values listed. Incorrect torque values may
cause a malfunction of the spools.
1.
Install new seals in bore in each section. See
Figure 10.
2.
Install new O-rings between sections.
3.
Install check valves.
CAUTION
When positioning the sections, do not damage
the O-rings.
4.
Carefully position the lift section in line with the
lift/tilt section.
5.
Install nuts, finger tight, on the four bolts.
6.
Torque the four nuts to 80 N•m (59 lbf ft).
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