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9
9.1 PROBLEMS
PROBLEM
Machine not working.
Machine carries out rise
movement but not
descent.
Descent is carried out at
extremely slow speed.
The motor is working pro-
perly but lifting cannot
be carried out.
The motor is working
properly but the rise speed
is extremely slow.
The rated capacity
cannot be raised.
S t o p
d u r i n g
d o w n -
shift.
The pawl release lever
does not disengage.
38
CAUSE
a) Main switch to "0".
b) Transformer fuse or general protective
fuses interrupted.
c) Electrical system faulty.
a) Descent solenoid valve blocked in closed
position.
a) The flow regulating valve is not working
properly.
a) Descent solenoid valve blocked in open
position.
b) Pump suction filter clogged.
c) Drive joint broken.
d) Calibrating valve not working properly.
a) The descent solenoid valve is partially
open.
b) Pump suction filter partially clogged.
c) Worn or damaged pump.
d) Calibrating valve not working properly.
e) Worn seals in hydraulic cylinders.
a) Calibrating valve not working properly.
b) Worn or damaged pump.
a) Possible obstacle under the pla-
tform.
b) Latch in.
a) Slackened connecting wire.
0508-M002-0
SOLUTION
a)
Turn to "I".
b)
Replace used fuses.
If a fuse interrupts again, find the cause
of the problem.
c)
Check efficiency, components and con-
nections (switch, contactor, transformer).
a)
See "Maintenance" chapter.
b)
Reset the limit switch and replace if ne-
cessary.
a)
See "Maintenance" chapter.
a)
See "Maintenance" chapter.
b)
Clean filter.
c)
Replace joint.
d)
Ask for technical assistance.
a)
See "Maintenance" chapter.
b)
Clean filter.
c)
Replace pump.
d)
Ask for technical assistance.
e)
Replace seals.
a)
Ask for dealer's assistance.
b)
Check pump efficiency and replace if
necessary.
a)
Remove obstacle.
b)
Check latch.
a)
Adjust.
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