Wood’s Powr-Grip MRPT89DC - Manual (Page 29)

Rev 24.0/12-13 27 MRPT89DC: #35062
L
INEAR
T
ILT
A
CTUATOR
Since the tilt actuator is prelubricated, no additional lubrication is required under normal
circumstances. 20
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) Determine which end of the stroke needs to be adjusted, and identify the limit switch
governing the stroke limit in that direction.
2) Determine which direction to move the limit switch in order to produce the desired
adjustment: Rotating the limit switch’s arm on the splined shaft changes the position of the
roller in relation to the corresponding contact surface on the lifter. To
reduce the stroke
length, move the roller of the limit switch towards the contact surface. To increase the stroke
length, move the roller of the limit switch away from the contact surface.
3) Note the current position of the limit switch’s arm on the shaft. Then loosen the socket-head
screw on the arm, rotate the arm in the appropriate direction on the shaft, and tighten the
socket-head screw to secure the arm.
4) Check the stroke length and repeat steps 1-3 as necessary to obtain the desired adjustment.
20
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.