Genie GTH-1048, Service Manual

Page: 57 / 214

Section 3 • Scheduled Maintenance Procedures September 2014
Part No. 123701 GTH-1048 • GTH-1056 3 - 23
C-7
Inspect and Lubricate the
Sequencing Chains
Genie specifications require that this procedure be
performed every 500 hours or semi-annually,
whichever comes first. 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.
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 firm level surface, level
the boom and engage the parking brake.
2 Fully extend the boom.
3 Inspect the chains for the following conditions:
· Elongation
BL866
chain - Measure 12 pitches of the
extend chain for machines using BL866 chain.
Note: For identification, this chain typically
measures one inch between pin centers when
new.
BL666 chain - Measure 16 pitches of the
extend chain for machines using BL666 chain.
Note: For identification, this chain typically
measures 3/4 inch between pin centers when new.
Note: 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 12.36 inches /
313mm or less. The chain is within
specifications. Continue with inspection.
Result: If the distance is greater than
12.36 inches / 313mm, 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 3%.
CHECKLIST C PROCEDURES