Page
16
Molnar 4 Post Hoist
SM4
X
0
Symptom:
Cause:
Remedy:
Unusually high noise level
Pump worn
Replace pump
Hoist
overloaded
Max. load - see decals
Seal in high pressure cylinder
defective
Replace or
repair
cylinder
Incorrect post position
Reposition posts according to installation
instructions
Oil pressure release valve out of
adjustment
Adjust relief valve to correct setting
.
Hoist
cannot ascend
Overloading
Max. load - see decals
Insufficient pressure from pump
unit
See
pump info below
Hoist
cannot descend
Pump does not start
See pump info below
One or more of the ratchets still
activated
Lift free from ratchet rails before low-
ering
Hoist
cannot reach topmost
position
Insufficient oil in
tank
Fill up oil
tank
Incorrect cable adjustment (too
long)
Adjust cable
Platform descends when
ratchets are not engaged
Leaks in hydraulic system
See above oil leakage info
Lowering valve/ non-return valve
leaking (internal in the pump unit)
Call authori
s
ed service
technician
Pump unit cannot start
Electric failure
Check fuses.
Incorrect electric connections
Call authori
s
ed electrician
Fault in control box
Faulty electric motor
Defective pushbutton
Replace
Pump unit delivers none or
insufficient pressure
Pump defective
Replace pump
Air in hydraulic system
Lower platforms to bottom positi-on
without load and keep pressing
DOWN-button for approx. 20 sec.
Non-return valve or oil pressure
relief valve defective (internal in
pump unit)
Call authori
s
ed service
technician
