Page 3-12
Maintenance - 3.12 - Hydraulic Manifold
SL20
3.12 H
YDRAULIC
M
ANIFOLD
Though it is not necessary to remove the manifold to perform all maintenance proce-
dures, a determination should be made as to whether or not the manifold should be
removed before maintenance procedures begin.
R
EMOVAL
1. Remove 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 locknuts, jam nut, and bolts that hold the manifold to the mounting
bracket.
5. Remove manifold block.
D
ISASSEMBLY
NOTE: Mark all components as
they are removed so as not to
confuse their location during
assembly. Refer to Figure 3-14
often to aid in disassembly and
assembly.
1. Remove coils from solenoid valves.
2. Remove solenoid valves, relief valves and overcenter valves.
3. Remove fittings, plugs, and springs.
C
LEANING AND
I
NSPECTION
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 any parts or o-rings found unserviceable.
A
SSEMBLY
NOTE: Lubricate all o-rings
before installation to prevent
damage to o-rings.
1. Install fittings, plugs, and springs.
2. Install overcenter valves, main relief valve, steering relief valve, and solenoid valves.
NOTE: Torque cartridge valves
to 34 N-m (25 ft. lbs.).
3. Install coils on solenoid valves.
NOTE: Torque coil retaining nuts
to 5.4-6.8 Nm (4-5 ft. lbs)
maximum.
I
NSTALLATION
1. Attach manifold assembly to mounting plate with bolts, washers, jam nut and lock-
nuts.
NOTE: Bolt at the left end of the
valve is installed from the
bottom and is secured with the
jam nut. Secure all ground wires
with locknut to this bolt.
2. Connect solenoid leads to terminal strip (as previously tagged).
3. Connect hydraulic hoses. Be certain to tighten hoses to manifold (see Table 3-2).
4. Operate each hydraulic function and check for proper function and leaks.
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