HOIST AND COUNTERWEIGHT RT540E SERVICE MANUAL
5-4 Published 4-20-2015, Control # 502-01
HOIST MAINTENANCE AND INSPECTION
It is extremely important that maintenance staff involved with
the crane inspections be made aware of the possibility that
deterioration of internal critical components within the hoist
can occur. Hoists incorporate planetary gears, multi-disc
brake assemblies and sprag clutches which do not have an
infinite service life span. Although these components have
been designed to achieve long service life, reliability can be
substantially reduced by a variety of influencing factors such
as:
• High cycle operation
• Operating in high ambient temperatures
• High external contamination, such as dusty or sandy
conditions
• Type of lubricant used
• Level of maintenance
The following routine servicing points must be carried out in
accordance with manufacture’s instructions:
Usage and Inspection
Inspection procedures for hoists are divided into five general
categories based upon their usage or duty cycle, which in
turn determines appropriate intervals for inspections. The
usage categories must be assigned by the crane user on a
consistent crane-by-crane basis. The five crane/hoist usage
categories are as follows:
•Idled - The crane/hoist has not been used for three
months.
• Infrequent Usage - The crane/hoist is used less than
ten hours per month based on a three month average
• Moderate Usage - Crane/hoist used 10 - 50 hours per
month based on a three month average.
• Heavy Usage - Crane/hoist used 50 - 200 hours per
month.
• Severe Duty - Crane/hoist is operated more than 200
hours per month OR where 50% of the lifts exceed 75%
of the rated capacity for the hoist.
NOTE: For idled units with unknown maintenance and
repair history, it is highly recommended that the
hoist undergo a tear down inspection prior to being
placed into service.
The following chart lists the inspections that are required for
each type of usage category:
Reference Only
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