September - Genie GTH-636 Maintenance Manual

September 2016

GTH-1256 and GTH-1544 models
• Elongation
Note: The pitch of the boom extend chains (boom
lower section) shall be 1 inch / 25.4 mm.
Note: The pitch of the boom retract chains (boom
upper section) shall be 0.75 inches / 19.05 mm.
GTH-1256: Only the extend chains should be
measured.
GTH-1544: Both the extend and retract chains
should be measured.
Note: Measurement should be taken in the area
where the chain articulates most frequently over
the sheaves.
Result: The distance measures 1 inch /
25.4 mm (lower chain) or 0.75 inches /
19.05 mm (upper chain). The chain is within
specification. Continue with inspection.
Result: The distance is greater than 1 inch /
25.4 mm (lower chain) or 0.75 inches /
19.05 mm. The machine shall be removed
from service until the chain is replaced.
Note: The boom chain's normal life expectancy can
be expressed as a maximum percent of elongation
of 2%.
Note: Consult Product Support to know the correct
procedure to better understand maximum percent
of chain elongation.
Part No. 1272858
Quarterly Maintenance Procedures
All models:
• Edge wear:
Check the chain for wear on the link plate
edges caused by running back and forth over
the sheave. The maximum reduction of
material should not exceed 5%.
• Cracked plates:
Check link side plates for any cracks. These
are generally a sign of chain fatigue.
• Turning pins:
Check the pins. The position of the riveting
must be parallel with the top and bottom of the
side plate.
If any of these conditions are discovered during the
inspection, the chain must be replaced.
After inspection and before being returned to
service, the chains must be lubricated with a quality
chain lubricant.
Note: Do not use grease to lubricate chains.
The chain plates should be brushed with a wire
brush prior to lubrication to clear the space
between the plates.
The lubricant must penetrate the chain joint to
prevent wear. Applying lubricant to the external
surfaces will prevent rust, but the chains should be
articulated to make sure the lubricant penetrates to
the working surfaces between the pins and links.
Lubricant may be applied with a brush, sprayed or
poured on, but the chain should be well flooded
with lubricant and the boom should be extended
and retracted to insure that the lubricant penetrates
all working surfaces. All excess lubricant should be
wiped away from the external surfaces.
Note: Do not use solvents to remove excess
lubricant.
Genie Telehandlers
Maintenance Manual
37