Four post workshop lift HAPP27
Version 5
WWW.HAPP.COM.AU
44
Troubleshooting
Failure
Cause
Solution
Engine doesn’t rotate
①
Bad contact of wires
Check or change contacts
②
contact
wires
for
optional limit switch
are not bridged
Adjust or change limited
switch if installed or bridge
wires out of motor
③
bad action of limit
switch (if installed)
Check
the
electromagnetism valve and
clean it
Engine rotates but lift does
not ascend
have dust in the center of
the electromagnetism valve
Check
the
electromagnetism valve and
clean it
The line pole is loose
Fix it
④
falling
short
of
hydraulic oil
Fill with hydraulic oil
The ascend speed is slow
The oil seal hole is leaking
Change the oil seal
Shake in the running
Air in the hydraulic pressure
loop
Release the air by redo the
ascend and decent
Air leak at the top connect
oil tube mouth of the pump
Check the seal of the oil
tube mouth
Filtrate net is jam
Clean it
Only
ascend,
cannot
descend
Bleed valve too tight (allen
keyed adjuster in centre of
pump assembly)
Adjust out in ½ turn
increments
until
hoist
descends.
②
connect invalidation in the
button
Check the button
③
electromagnetic valve
blocked
Check
or
change
electromagnetic valve
④
descending
electromagnetic
valve
unopened
Check
or
change
electromagnetic valve
⑤
Hydraulic oil too dense(in
winter)
Add oil according to the
manual
Oil leak
Loose fitting
Screw the fitting in gently.
