Adjust The Boom Sequencing Chains - Gth-1256 And Gth-1544 - Genie GTH-636 Maintenance Manual

Maintenance Manual
Annual Maintenance Procedures
6 Place an adjustable wrench across the flat
part of the chain, just ahead of the chain
anchor. Tighten the wrench onto the chain.
7 Using a 1 7/16 inch wrench, adjust the nut as
required to tighten or loosen the chain. Repeat
this procedure beginning with step 4 until the
gap is between 0.25 to 0.5 inch / 6.35 to
12.7 mm.
Note: If the adjusting bolt runs out of threads before
the chain tension is correct, the chain has stretched
too far and the chain must be replaced.
1 nut
2 washer
3 spacer
4 chain anchor
8 Fully retract the boom.
9 Measure the gap between the washer and the
spacer. The gap should be between 0.125 to
0.25 inch / 3.2 mm to 6.35 mm.
40
A-4 A-4 Adj ust the Boom Sequencing C hai ns - GTH-1256 and GTH- 1544
Adjust the Boom Sequencing
Chains - GTH-1256 and GTH-1544
Genie specifications require that this procedure be
performed annually.
Extend chains (boom bottom side)
1 Raise the boom to horizontal position.
2 Fully extend the boom.
3 Retract it about 3.9 inches / 100 mm.
4 Tighten the chain up to a maximum tension
value of 37 ft-lbs / 50 Nm.
5 Check that all chains have been equally
tensioned. If not, repeat the operation
described above.
6 Lock the chain tensioners by means of a
counternut and locknut.
Retract chains (boom upper side)
1 Fully retract the boom.
2 Extend the boom by 11.8 inches / 300 mm.
3 Loosen the locker nut.
4 Tighten the tensioning nut to 37 ft-lbs / 50 Nm.
5 Tighten the locker nut.
6 Check that all chains have been equally
tensioned. If not, repeat the operation
described above.
Note: If during chain tensioning, problems are
detected, please Genie Product Support.
Genie Telehandlers
September 2016
Part No. 1272858