Wood’s Powr-Grip MRPT1211LAC - Manual (Page 24)

Rev 0.0/9-12 22 MRPT1211LAC: #35063
L
INEAR
T
ILT
A
CTUATOR
Since the tilt actuator is prelubricated, no additional lubrication is required under normal
circumstances. 15
The actuator has an intermittent-duty type motor and a duty cycle of approximately 20%: If the
actuator is operated more than 20% of the time or runs continuously for more than 5 minutes, a
thermal overload relay breaks the power circuit. It then takes about 10 minutes before the
motor cools sufficiently for the thermal relay to close and restore power.
The brake is preset and should provide consistent braking for the tilt function. In the event that
the brake friction surfaces become worn (indicated by excessive drift), contact Wood's Powr-Grip
for rebuilding.
The limit switches which control the stroke length also are preset and should not need
adjustment. However, if adjustment is required, proceed as follows:
1) Remove the appropriate cover plate (on actuator head, facing screw shaft side) to expose the
limit switches (1 and 5).
2) Engage the actuator until it reaches the correct retracted or extended position (depending on
adjustment needed). Stop the actuator before any parts of the vacuum lifter come in contact
with each other.
3) Remove the nut restrainer (3).
4) Turn the appropriate limit switch nut (2 or 4) as needed to activate the limit switch, allowing
for drift.
5) Check actuator travel and readjust if necessary. Then reinstall the nut restrainer and cover
plate.
15
If the actuator is not used for a week or more at a time, oil may begin to separate from the lubricant and leak out. Although
this leakage is not detrimental to the lubrication or operation of the actuator, you can avoid this condition by simply running the
actuator for a few cycles each week.