B Checklist D Procedures; Inspect The Forks; Adjust The Boom Sequencing Chains - Genie GTH-636 Service Manual

Section 3 • Scheduled Maintenance Procedures
Checklist D Procedures
D-1

Inspect the Forks

Note: Genie specifications require that this
procedure be performed every 1000 hours or
annually, whichever comes first OR whenever
permanent deformation of the forks is suspected.
Maintaining the lifting forks in good condition is
essential to safe operation and good machine
performance. Failure to detect damage to the forks
could result in a hazardous operating condition.
1 Thoroughly clean the lifting forks.
2 Inspect the forks for the following:
· Surface cracks
· Straightness of the blade and shank
· Fork angle at 90 ± 3 degrees
· Relative height of fork tips shall not differ
more than 3% of blade length
· Excessive wear to the forks, fork mount or
legible markings
Result: If any of the above criteria are not met,
the fork shall be removed from service until it is
repaired or replaced.
a shank
b blade
3 - 28 GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056
D-2
Adjust the Boom Sequencing
Chains
Note: Genie specifications require that this
procedure be performed every 1000 hours or
annually, whichever comes first.
GTH-636, GTH-644, GTH-842, GTH-844 and
GTH-1048:
1 Raise the boom to the horizontal position.
2 Extend the boom fully, then retract the boom
approximately 1 inch / 25 mm.
3 On either side of the middle boom section,
estimate the center. Place one end of a
tape measure on the top surface of the
boom directly above the estimated center.
4 Select a reference point on the sequencing
chain. Measure the distance between the chain
and the top surface of the boom. Note the
measurement (1). Refer to the following
illustrations.
a
b
June 2007
REV B
2
1
Part No. 97487