Wood’s Powr-Grip MRPT89ACO - Manual (Page 21)

Rev 13.0/2-13 19 MRPT89ACO: #35061
T
ILT
C
OMPONENTS
M
AINTENANCE
High-Duty Tilt Actuator
Powered tilt motion is performed by a 90-volt DC, ball screw linear actuator, or "tilt actuator".
The only user-replaceable parts of the actuator motor are the brushes. Check the brushes
initially after 42,000 tilt cycles and every 20,000 tilt cycles thereafter. 13 Replace the brushes if
their square section is worn to a length of 5/16" [8 mm] or less.
The ball screw and guide bearings are prelubricated and should not require any additional
lubrication. Although the tapered load bearings also are prelubricated, use the grease zerk on
the side of the bearing housing to apply a small amount of light, general-purpose grease to them
after every 20,000 tilt cycles.
Do not over-lubricate.
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 stroke length also are preset and should not need adjustment.
However, if adjustment is required, proceed as follows:
CAUTION: Exercise special care when adjusting limit switches because excessive
actuator motion can damage lifter components.
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’s rotation hub. 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.
Tilt Speed Controller
Tilt speed and power are governed by the tilt speed controller (located on lift bar), which
operates on 120 volts AC to produce an adjustable 0 to 90 volts DC for the actuator motor, and a
constant 90 volts DC for the actuator brake.
The tilt speed controller has 2 speed control dials. The
upper dial (marked “TILT #1”) controls
the speed of actuator extension . The lower dial (marked “TILT #2”) controls the speed of
actuator retraction .
The speed controller's internal settings for minimum and maximum motor speeds, acceleration
and deceleration rates, and motor torque are preset and should not need adjustment. If any of
these settings needs adjustment, contact Wood's Powr-Grip for instructions.
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“Tilt cycle” indicates full 90° travel in both directions.