Omer Kar 350, Operation And Maintenance Manual

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6.4. Abnormal operation
WHAT HAPPENS WHERE CHECK
The lift does not rise and the
motor does not start
• FUSES
•THERMAL RELAY
•TRANSFORMER
•MOTOR
•CONTACTOR
•PHOTOCELLS
a.1. line fuse blown
a.2. 24 volt fuse blown
b.1. thermal relay tripped, re-set
c.1. transformer burnt out, does not emit 24 volt
d.1. motor short-circuited or burnt out
e.1. contactor C1 burnt out
f.1. photocell fault
f.2. photocells out of reading range
The lift does not rise and the
motor starts
• HYDRAULIC PUMP
• DISCHARGE VALVE
• LIMIT VALVE
• MOTOR
a.1. o-ring seal broken
a.2. key broken
a.3. aspiration tube broken
a.4. clamping screws loose
a.5. check oil leakage
a.6. check the pressure value
b.1. EV1 remains open
c.1. limit valve broken
d.1. Check that the motor turns in the direction shown
by the arrow
The lift does not lower and the
pressure is normal
• PHOTOCELLS
• TRANSFORMER
• HYDRAULIC VALVE
•MECHANICAL SAFETY
DEVICES
•AIR VALVE
a.1. photocells fault
a.2. photocells out of reading range
b.1. transformer burnt out, does not emit 24 volt
c.1. EV1 blocked
c.2. check the velocity fuse on the bottom of the dual
effect cylinders
d.1. EV1 24 V coil burnt out
e.1. mechanical safety devices mechanical blocked
f.1. EV2 air blocked (does not open the mechanical
safety devices)
f.2. EV2 requires power
The lift rise not leveled • CYLINDERS
• VALVE
a.1. air in the circuit
a.2. seal wear : SLAVE and/or MASTER
b.1. oil leak from the filling valves
Metallic noise • BUSHING a.1. bushing wear
Raising intermittently • PINS a.1. pin damage