3-22
GTH-1256 AF
Part No. 57.4400.9219
September 2017
Section 3 • Scheduled Maintenance Procedures
C-5
Inspect and Lubricate the
Sequencing Chains
Genie speci
fi
cations require that this procedure
be performed every 500 hours or semi-annually,
whichever comes
fi
rst. In extremely dusty or
hostile environments, it may be necessary to
lubricate the chains more often.
Maintaining the sequencing chains in good
condition is essential to safe operation and good
machine performance. Failure to detect damage
to the chains could result in a hazardous operating
condition.
Environments in which Genie Telehandlers
operate can vary widely from outdoor moisture and
temperature extremes, to mildly corrosive or highly
corrosive industrial atmospheres, in addition to
abrasive exposures such as sand and grit.
In addition, dynamic shock loading can impose
abnormal loads above the endurance limit of the
chains. Examples of dynamic shock loading are:
• High velocity movement of load, followed by
sudden abrupt stops.
• Carrying loads in suspension over irregular
surfaces and rough terrain.
• Attempting to "inch" loads which are beyond
the rated capacity of the vehicle.
CHECKLIST C PROCEDURES
The load cycles and environmental conditions
make it impossible to predict chain life. It
is therefore necessary to conduct regular
inspections.
1 Park the machine on a
fi
rm, level surface, level
the boom and engage the parking brake.
2 Fully extend the boom.
3 Inspect the chains for the following conditions:
• Elongation
Note: the pitch of the boom extend chains (boom
lower section) shall be 1 inch / 25.4 mm.
Only the extend 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). The chain is within
speci
fi
cation. Continue with inspection.
Result: The distance is greater than 1 inch
/ 25.4 mm (lower chain). The machine shall
be removed from service until all the chains
(retract and extend ones) are replaced.
Note: The boom chain's normal life expectancy
can be expressed as a maximum percent of
elongation of 2%.
Note: Please ask the service to know the correct
procedure to better understand the maximum
percent of chain elongation.
