Page 3-12
Maintenance 3.10 - Hydraulics
TM12 Work Platform - European
H
YDRAULIC
V
ALVE
A
SSEMBLIES
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 filter.
5. Remove the locknuts, jam nut and bolts that hold the valve block to the mounting bracket.
6. Remove valve block.
D
ISASSEMBLY
.
NOTE: Mark all components as they are removed so as not to confuse their location during 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 valve block in cleaning solvent to remove built up contaminants and then blow out
all passages with clean compressed air.
2. Inspect the valve block 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.
A
SSEMBLY
NOTE: Lubricate all O-rings before installation to prevent damage to O-rings. Seat all balls in valve
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.
I
NSTALLATION
1. Attach valve block assembly to mounting brackets with bolts, washers, and locknuts.
2. Connect solenoid leads to terminal strip (as previously tagged).
3. Connect hydraulic hoses. Be certain to tighten hoses to valve block.
4. Install oil filter.
5. Operate each hydraulic function and check for proper function and leaks.
Adjust all hydraulic pressures according to instructions in “ Setting Hydraulic Manifold Pressures”
on Page 3-16.
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