Atlas Copco LLA2500-L-ATEX Manuel D'instructions page 22

Troubleshooting
Troubleshooting
Troubleshooting overview
Fault
Lifting speed too low or insufficient
lifting capacity
Lowering speed too low
Not possible to inch slowly
Load sliding
Load is not lifted on full throttle
Control system fails to return to neu-
tral position
Defective Vane motor
22
EN
Cause
The working air pressure too low.
Incorrect dimensions of hoses con-
nected to compressed air line.
Load exceeds rated load.
Insufficient oil supply to motor.
Seizing Vane motor.
Brake incorrectly set.
Inlet strainer clogged.
Exhaust silencer clogged.
Incorrect limitation of Control yoke
movement.
Incorrect limitation of Control yoke
movement.
Insufficient oil supply to motor.
Incorrectly adjusted brake.
Poorly lubricated chain.
Excessive chain wear.
Vane motor seizing.
Brake requires adjustment.
Oil or grease on brake parts.
The working air pressure is too low. Adjust pressure.
Incorrectly set Overload protection
device.
Load exceeds rated load.
Control yoke resting against chain
guide.
Control shaft bent.
Seizing Valve cone.
Seizing Valve motor.
© Atlas Copco Industrial Technique AB - 9836 9861 00
LLA2500-L-ATEX
Action
Adjust pressure.
Change hoses or other fitting parts.
Reduce load to specified rated
value.
Adjust lubricator setting.
Dismantle vane motor, see "Ser-
vice instructions".
Adjust brake, see "Operating in-
structions".
Unscrew adapter and clean
strainer.
Clean the silencer.
Adjust the control yoke, see "Oper-
ating instructions".
Adjust the control yoke.
Adjust lubricator setting.
Adjust brake.
Clean and lubricate chain.
Fit a new chain.
Dismantle motor.
Adjust brake.
Dismantle brake and clean all
parts. Check thickness of brake lin-
ings. Minimum thickness approxi-
mately 1 mm.
Adjust overload protection device.
Reduce load below specified rated
load.
Adjust position of control yoke.
Change control shaft.
Clean and lubricate Valve cone.
Also check fitting of Valve cone
liner.
Remove Vane motor from hoist.
Check and adjust Vane motor if
necessary.