Checklist D Procedures; Check The Boom Wear Pads - Genie ZX-135/70 Service Manual

Service Manual

Checklist D Procedures

D-1

Check the Boom Wear Pads

Genie specifications require that this procedure be
performed every 1000 hours or annually,
whichever comes first.
Maintaining the boom wear pads in good condition
is essential to safe machine operation. Wear pads
are placed on boom tube surfaces to provide a low
friction, replaceable wear pad between moving
parts. Improperly shimmed wear pads or continued
use of extremely worn wear pads may result in
component damage and unsafe operating
conditions.
1 Measure each wear pad. Replace the wear
pad once it reaches the minimum allowable
thickness. If the wear pad is still within
specification, shim as necessary to obtain
minimum clearance with zero binding.
Note: The minimum shim clearance for the
secondary boom wear pads is 0.070 inch / 1.8 mm
and the maximum allowable shim clearance is
0.25 inch / 6.4 mm.
Note: The minimum shim clearance for the jib
boom and primary boom wear pads is 0.070 inch /
1.8 mm and the maximum allowable shim
clearance is 0.188 inch / 4.8 mm.
2 Extend and retract the boom through the
entire range of motion to check for tight spots
that may cause binding or scraping of the
boom.
Note: Always maintain squareness between the
outer and inner boom tubes.
64
Primary boom wear pad specifications
Top, bottom and side wear pads
(platform end of boom)
Top and bottom wear pads
(pivot end of boom)
Side wear pads
(pivot end of boom)
Secondary boom wear
pad specifications
Top wear pads
(extension end of boom)
Side wear pads
(extension end of boom)
Bottom wear pads
(extension end of boom)
Top and bottom wear pads
(pivot end of boom)
Side wear pads
(pivot end of boom)
Jib boom wear pad specifications
Bottom and side wear pads
(platform end of boom)
Top wear pads
(platform end of boom)
Top and side wear pads
(pivot end of boom)
Bottom wear pads
(pivot end of boom)
ZX-135/70
August 2014
Minimum
5/8 inch
15.9 mm
1/2 inch
12.7 mm
3/8 inch
9.5 mm
Minimum
3/8 inch
9.5 mm
1/2 inch
12.7 mm
7/8 inch
22 mm
5/8 inch
15.9 mm
1/2 inch
12.7 mm
Minimum
5/8 inch
15.9 mm
1/2 inch
12.7 mm
3/8 inch
9.5 mm
5/8 inch
15.9 mm
Part No. 218700