4-9
Section
4.7 Hydraulic Manifold
Though it is not necessary to remove the manifold to
perform all maintenance procedures, a determination
should be made as to whether or not the manifold should
be removed before maintenance procedures begin.
REMOVAL
1. Remove battery ground cable.
2. Remove plastic cover from first post.
3. Tag and disconnect the solenoid valve leads from the
solenoids.
4. Tag, disconnect and plug hydraulic hoses.
5. Remove securing bolts that hold manifold block to first
post.
6. Remove manifold block.
DISASSEMBLY
NOTE: Mark all components as they are removed so as
not to confuse their location during assembly. Refer to
Figure 4-9 often to aid in disassembly and assembly.
1. Remove coils from solenoid valves.
2. Remove solenoid valves and relief valves.
3. Remove fittings and bonded washers.
4. Remove spool housings and spools.
CLEANING AND INSPECTION
1. Wash the manifold in cleaning solvent to remove
built up contaminants and then blow out all passages
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.
1. Install fittings and bonded seals.
2. Install relief valves and solenoid valves.
Note: Torque cartridge relief valves to 45NM.
Torque solenoid spool cartridges to 20NM
Torque coil retaining nuts to 3.4NM
INSTALLATION
1. Attach manifold assembly to first post with bolts and
washers.
2. Connect hydraulic hoses to their destinations on the
manifold block.
3. Connect soleniod leads to their correct coils.
4. Operate each hydraulic function and check for
proper function and leaks.
5. Re-secure plastic cover to first post.
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