Section
4-10 LX 31/41 Work Platform
Maintenance
4.7 Hydraulic Manifold
(Figure 4-12)
Though it is not necessary to remove the manifold to
perform all maintenance procedures, a determination
should be made prior to beginning as to whether or not
the manifold should be removed before maintenance
procedures begin.
REMOVAL
1. Disconnect the battery ground cable.
2. Tag and disconnect the solenoid valve leads from
the terminal strip.
3. Tag, disconnect and plug hydraulic hoses.
4. Remove the bolts that hold the manifold to the
mounting bracket.
5. Remove manifold block.
DISASSEMBLY
NOTE: Mark all components as they are removed so
as not to confuse their location during assembly.
Refer to Figure 4-12 often to aid in disassembly and
assembly.
1. Remove coils from solenoid valves.
2. Remove spool valve cover and spool valve.
3. Remove solenoid valves, lift relief valve, counter-
balance valves and divider combiner valve.
4. Remove fittings, plugs, springs, balls and orifices.
CLEANING AND INSPECTION
1. Wash the manifold in cleaning solvent to remove
built up contaminants and then blow out all pas-
sages with clean compressed air.
2. Inspect the manifold for cracks, thread damage and
scoring where O-rings seal against internal and
external surfaces.
3. Wash and dry each component and check for
thread damage, torn or cracked O-rings and proper
operation.
4. Replace parts and O-rings found unserviceable.
ASSEMBLY
NOTE: Lubricate all O-rings before installation to
prevent damage to O-rings. Seat all balls in manifold
block by lightly tapping on the ball with a brass drift
punch.
1. Install fittings, plugs, springs, balls and orifices. Use
one drop of Locktite #242 on each screw-in orifice.
2. Install solenoid valves, lift relief valve, counter
balance valves, divider combiner valve, and spool
valve.
3. Install coils on solenoid valves.
INSTALLATION
1. Attach manifold assembly to mounting plate with
bolts.
2. Connect Solenoid leads to terminal strip (as previ-
ously tagged).
3. Connect hydraulic hoses. Be certain to tighten hoses
to manifold.
4. Operate each hydraulic function and check for
proper operation and leaks.
5. Adjust lift relief, steering relief, and counterbalance
valve pressures according to instructions in Section
4.5.
4.7
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