Adjust The Boom Sequencing Chains - Gth-1056 - Genie GTH-636 Maintenance Manual

September 2016
5 Move to the fork end of the same boom
section that was just measured.
6 Measure the distance between the top surface
of the boom and the same reference point
used on the sequencing chain in step 4. Note
the measurement (2).
Result: The difference between
measurements 1 and 2 is 0.25 to 0.5 inch /
6.35 to 12.7 mm. No adjustment to the chain is
necessary. Proceed to step 10.
Result: The difference between
measurements 1 and 2 is less than a
0.25 inch / 6.35 mm OR is greater than
0.5 inch / 12.7 mm. The chain requires
adjustment. Proceed to step 7.
Note: The measurements taken in step 4 and step
6 must be taken from the same plane on the boom.
7 Working at the fork end of the large boom
tube, locate the adjustable chain anchor on
the top of boom section.
8 Place an adjustable wrench across the flat
part of the chain, just ahead of the chain
anchor. Tighten the wrench onto the chain.
9 Using a 1 7/16 inch wrench, adjust the nut as
required to tighten or loosen the chain. Repeat
this procedure for each chain beginning with
step 4.
Part No. 1272858
Annual Maintenance Procedures
A-3 A-3 Adj ust the Boom Sequencing C hai ns - GTH-1056
Adjust the Boom Sequencing
Chains - GTH-1056
Genie specifications require that this procedure be
performed annually.
1 Raise the boom to the horizontal position.
2 Extend the boom fully, then retract the boom
approximately 1 inch / 25 mm.
3 Tie a string line on each end of the chain,
being sure to pull the string taut.
4 At the midpoint of the string, measure the
distance between the string and the chain
surface corresponding to the surface the string
line is attached to.
Result: The distance is 0.25 to 0.5 inch /
6.35 to 12.7 mm. No adjustment to the chain is
necessary. Proceed to step 8.
Result: The distance is less than a 0.25 inch /
6.35 mm OR is greater than 0.5 inch /
12.7 mm. The chain requires adjustment.
Proceed to step 5.
5 Working at the fork end of the large boom
tube, locate the adjustable chain anchor on
the top of the boom section.
Genie Telehandlers
Maintenance Manual
39