Enerpac Products UNI-LIFT M - Manual (Page 7)

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Table 2 - Troubleshooting Guide - Enerpac Uni-Lift ® Mechanical Actuators
Problem Possible Cause Action
Housing failure. 1. Actuator overloaded. Reduce load or replace actuator with a larger
actuator of suffi cient capacity.
2. Improper support. Check that the actuator is supported under the entire
base area (not just at the bolt holes).
3. High shock. Replace existing actuator with a larger actuator of
suffi cient capacity.
4. Uneven bolting torque. Torque all mounting bolts evenly.
Worm shaft failure. 1. Improper coupling. Replace coupling. The coupling used must provide
adequate fl exibility and lateral fl oat.
2. Coupling misalignment. Re-align coupling as required.
3. Excessive overhung load. Contact Enerpac for allowable overhung loads.
4. Actuator overloaded. Reduce load or replace existing actuator with a larger
actuator of suffi cient capacity.
5. Shock loading. Install coupling capable of absorbing shock. If
necessary, replace existing actuator with a larger
actuator of suffi cient capacity. Note: Shock loads
can signifi cantly increase the apparent dead weight.
6. Excessive torque due to ganged actuators. If several actuators are connected in-line, the
worm shaft of the fi rst unit will be subjected to
the combined torque of all the units. If this torque
exceeds 300 percent of the rated input torque, the
fi rst unit must be replaced with a larger actuator of
suffi cient capacity.
Bearing failure. 1. Actuator overloaded. Reduce load or replace existing actuator with a larger
actuator of suffi cient capacity.
2. Coupling misalignment. Re-align coupling as required.
3. Load screw misalignment. Check that load screw is perfectly plumb.
4. Coupling lateral misalignment. Adjust spacing between connecting shafts to
reduce end pressure.
5. Bearing adjustment. Bearings must be preloaded. Contact Enerpac for
additional information.
6. Bearing lubrication. Proper grease level must be maintained and proper
grease type must be used.
7. Shock loading. Install coupling capable of absorbing shock. If
necessary, replace existing actuator with a larger
actuator of suffi cient capacity. Note: Shock loads
can signifi cantly increase the apparent dead weight.
Worm gear failure. 1. Actuator overloaded. Reduce load or replace existing actuator with a larger
actuator of suffi cient capacity.
2. Load screw misalignment. Check that load screws are perfectly plumb.
3. Insuffi cient lubrication. Proper grease level must be maintained and proper
grease type must be used.
4. Duty cycle limit exceeded. Reduce the number of cycles per hour or reduce the
load. Contact Enerpac for the maximum allowable
duty cycle.
5. Side loading. Eliminate side load.
Load screw failure. 1. Actuator overloaded. Reduce load or replace existing actuator with a larger
actuator of suffi cient capacity.
2. Load screw misalignment. Check that load screw is perfectly plumb.
3. Side loading. Eliminate side load.