Adjust The Sequencing Chains - Genie GTH-1048 Service Manual

Section 3 • Scheduled Maintenance Procedures
CHECKLIST C PROCEDURES
· 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
to the working surfaces. All excess lubricant should
be wiped away from the external surfaces.
Note: Do not use solvents to remove excess
lubricant.
3 - 24
C-8
Adjust the Boom Sequencing
Chains
Note: Genie specifications require that this
procedure be performed every 500 hours or
semi-annually, whichever comes first.
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.
String Line
GTH-1048 • GTH-1056
September 2014
Part No. 123701