Inspect and adjust1)Excessively high working
pressure
7.Fluid
overheating
Maintain specified level by replenishing 3)Insufficient fluid
Replace with fluid of adequate viscosity.2)Too high or low viscosity
of working fluid.
Inspect,readjust,repair,or replace link
mechanism if necessary.
2) Poor link mechanism
Readjust lever stopper guide position1) Maladjusted lever stopper
check valve
6.When hydraulic
control lever is
raised,relief,valve
beeps.
Open valve sufficiently3)Excessively closed slow-
return check valve
Lower lever sufficiently2)Insufficiently lowered
control lever
Repair or adjust according to instructions
mentioned above.
1)Above mentioned causes
can also be possible.
5.Too slow lift
lowering speed
Lap lightly after disassembling, cleaning,
and repairing flaws with oil stone or replace
as an assembly.
4)Stuck main spool
Apply grease and repair or replace bushings
or shaft if necessary.
3)Seized lift shaft
Lap after disassembling, cleaning,repairing
flaws with oil stone
2)Stuck poppet of slow-
Return-check valve
Turn knob to fast position1)Slow-return-check valve
knob is turned to the lock
position
4.Lift does not
lower
Replace3)Poor 0-ring
Replace valve2)Poor valve seat
Lap after disassembling,cleaning,repairing
flaws with oil stone
1)Stuck poppet3.Lift lowers even
when adjust knob
is closed fully with
adjust Handle
(While engine is
stopped)
Correct minor flaws with an oil stone4)Stuck poppet
(unloading valve 2)
Replace spring.3)Broken compensator spring
(unloading valve 1) in control
valve
Inspect,readjust,or replace link mechanism
if necessary.
2) Too small a spool stroke in
control valve
Repair according to above instructions.1)Above causes can also be
possible
2.Too low
rising speed of
lift
CountermeasuresCausesProblems
9-30
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