2000 SRM 1233
Main Control Valve, Section 2 of Hydraulic Plate
Main Control Valve, Section 2 of Hydraulic Plate
REMOVE
WARNING
Lower carriage completely before working on
control valve or hydraulic system.
Do not work under a raised carriage.
Put
mast in a vertical position and lower carriage
completely before disconnecting any parts of
hydraulic system.
The mast can lower sud-
denly and cause injury if the carriage is not
lowered. This procedure will make sure that
the carriage cannot lower suddenly and cause
injury or death.
Proceed as follows:
1.
Place the lift truck on a solid, even, and level
surface.
2.
Shut down the engine.
3.
Put blocks on both sides (front and back) of the
tires to prevent movement of the lift truck.
4.
Turn the key switch to the ON position.
WARNING
Apply brake pedal 10 to 20 times until accumu-
lated hydraulic brake pressure is released.
5.
Turn the key switch to the OFF position.
6.
Close shutoff valves on the bottom of the tank.
7.
Remove the cover on the topside of the frame.
8.
Tag and disconnect electric wires at spools of con-
trol valve.
9.
Put tags for identification on hydraulic lines.
Disconnect the hydraulic lines from the main
control valve. Keep the end of the hose above
the hydraulic tank until a plug is installed in the
hose. Put caps on the open lines, ports, or other
connectors.
NOTE:
Only remove the main control valve from
mounting plate when part to be repaired is not
accessible. Disassemble main control valve as nec-
essary for repairs. Most repairs are for replacement
of O-rings.
10. Remove the four bolts that fasten the main con-
trol valve on the hydraulic plate.
WARNING
The main control valve weighs approximately
65 kg (145 lb) and can cause serious injury if
the control valve is not lifted properly or falls.
Verify that the main control valve has proper
support before removing the mounting bolts.
Use a lifting device to remove the main control
valve, and verify that the main control valve is
secure and cannot fall out of the lifting device.
11. Remove the control valve from the hydraulic
plate.
DISASSEMBLE
1.
To remove a spool, remove end cap from valve
section. Carefully pull spool from valve section.
Keep the spring package together.
Put tags
on spools that are removed.
Spools must be
installed in the sections from which they are
removed.
2.
Remove seal retainer for top of spool. Remove
O-rings and wipers from both ends of the section
of the valve and spring packages.
NOTE:
The main control valve is divided into a lift/tilt
section, lift section, and auxiliary section. Each sec-
tion has a different spool or spools, and spring pack-
ages.
3.
Remove auxiliary section, lift section, and lift/tilt
section as follows:
Auxiliary Section
CAUTION
Make sure to protect machined surfaces for
O-rings when the sections are separated. Small
defects can cause leaks.
1.
Place the main control valve on a clean and level
surface.
2.
Loosen the four nuts. See Figure 10.
3.
Carefully remove the four nuts and bolts.
4.
Carefully slide the auxiliary section from the lift
section.
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