4-column
electro-hydraulic lift
Mod. Z31
Page
20
Use,
maintenance and spare parts manual
TROUBLESHOOTING
PROBLEMS
CAUSES
SOLUTIONS
General switch set on “0”.
Set the switch on “I”.
Interrupted transformer
fuse or general protection
fuses.
Replace the interrupted
fuses.
Electrical installation
breakdown.
Check connections and
components efficiency
Open contacts on up limit
switch.
Restore limit switch
efficiency and replace it if
necessary.
Open contacts on ropes
breakage safety limit
switch.
Restore limit switch
efficiency also making
sure that the safety limit
switch operating cam
control system works
properly.
Ropes breakage limit
switch operated due to a
very loosened rope.
Operate the up
pushbutton
simultaneously with the
restart pushbutton until
the ropes come under
tension.
No operation
Ropes breakage limit
switch operated due to a
broken rope.
It is necessary to replace
the rope.
The lifting power
adjustment valve does not
work correctly.
Clean valve.
Lowering is performed
at extremely low speed.
Clogged pipe.
Clean valve piston.
Lowering electro-valve
blocked in the opening
position.
Clean electro-valve.
Clogged pump suction
filter.
Clean filter.
Damaged or worn piston
gasket.
Replace the gasket.
The motor turns
regularly but lifting
cannot be performed or
is very slow.
Damaged or worn pump.
Check pump operation;
replace it if necessary.
Lowering is possible,
climbing is not.
Up limit switch with open
contacts.
Restore limit switch
operation; replace it if
necessary.
