Inspect The Mast Wear Pads - Terex Genie GR-20J Service Manual

March 2022
B-13 B-13 In spect the Mas t Wea r Pads

Inspect the Mast Wear Pads

Genie specifications require that this procedure be
performed every 250 hours or quarterly, whichever
comes first.
Wear pads are used to provide a uniform fit
between the mast sections, as the mast assembly
extends and retracts. Over time, it may be
necessary to replace the wear pads to ensure
good machine performance.
Note: Perform this procedure with the machine on
a firm, level surface.
Note: Perform this procedure in an area that is free
of overhead obstructions.
Note: Perform this procedure in a location that is
sheltered from the wind.
1 Install a plumb line of a suitable length onto
the platform.
1 number 1 mast
2 plumb line
Part No. 1312899GT
Checklist B Procedures
2 Using a suitable lifting device, place a 440 lbs
/ 200 Kg test weight in the center of the
platform. Secure the weight to the platform.
3 Turn the key switch to ground control and pull
out the red Emergency Stop button to the on
position at both ground and platform controls.
Note: Rotate the red Emergency Stop button at
platform control one quarter turn in a clockwise
direction to restore the power supply. The red
Emergency Stop button returns automatically to
the out, or on position.
4 Raise the jib to the horizontal position.
5 From the ground controls, fully raise the mast.
6 Using a suitable measuring device, measure
the distance between plumb line and the face
of the number 1 mast. Refer to illustration.
Result: The distance between the plumb line
and the face of the number 1 mast does not
exceed 66.9 inches / 170 cm. The wear pads
are in good condition.
Result: The distance between the plumb line
and the face of the number 1 mast exceeds
66.9 inches / 170 cm. The wear pads are not
in good condition. Install new wear pads.
Refer to Repair Procedure, How to Remove
the Mast Assembly.
GR ™ -20J • GR ™ -26J
Service Manual
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