5-7
GRT9165 SERVICE MANUAL
HOIST AND COUNTERWEIGHT
5
Published 10-01-2020 Control # 699-00
GROVE
4.
Semi-Annual Inspections (every six months).
Must include but is not limited to the following inspections
that must be performed by a qualified crane operator or
qualified crane technician.
•
Perform Pre-Use and Quarterly inspections.
•
Take a sample of lubricant from hoist gear cavity as
described in
Gear Oil Sampling and Analysis
and analyze it for wear metals content, correct viscosity,
l u b r i c a n t d e t e r i o r a t i o n , m o i s t u r e a n d o t h e r
contaminants. If oil sample contains a high amount of
metallic particles, hoist must be taken out of service to
undergo a tear down inspection.
NOTE:
Oil analysis alone cannot detect or warn against a
fatigue failure.
5.
Annual Inspection.
This inspection must be carried out by a qualified crane
technician. Annual inspection MUST include, but not be
limited, to the following:
•
Perform Pre-Use/Daily Inspection, Quarterly Inspection,
and Semi-Annual Inspection.
•
Change lubricating oil in hoist gear cavity after an oil
sample has been taken as described in
, page 5-7. Refill hoist to proper
level with recommended lubricant. Refer to
•
Check for correct function of hoist brake by conducting a
high line pull load test. Ensure brake holds without
creeping and hoist control is correct. Check hoist brake
function more often if abnormal operating conditions or
characteristics exist.
6.
Every 10,000 hours or every ten years, it is
recommended that the hoist assembly be disassembled
and that all major components be examined for damage
and/or wear, i.e. gears, spline couplings, shafts, etc.
New components must be installed if any are found to be
worn or if there is evidence of heat or other damage. The
hoist should be reassembled using all new seals,
bearings, fasteners, washers, brake discs, brake
stators, and springs. A comprehensive hoist line pull and
load holding test must be conducted following the repair
work.
Hoist Oil Sampling
Oil Change
Hoist gear oil must be changed after the first 100 operating
hours then on an annual basis, at a minimum thereafter. In
severe duty applications, the gear oil should be changed
every six months. Use the recommended lubricants. Refer to
Gear Oil Sampling and Analysis
Proper gear oil sampling and analysis is a vital part of a
comprehensive preventive maintenance program.
Information obtained from the oil analysis allows the
m a i n t e n a n c e t e c h n i c i a n t o s u b s t i t u t e p r e v e n t i v e
maintenance for more costly unscheduled down time or a far
more dangerous failure. Early detection of accelerated
component wear allows the scheduling of corrective
maintenance.
Prepare hoist by cleaning drain area and to obtain an
uncontaminated sample. Operate hoist in both directions for
one or two minutes to thoroughly mix the gear oil. Take
sample from midstream flow of oil to obtain an accurate
representation of the oil condition. After taking the oil sample,
continue with oil change or refill hoist gear cavity to proper
level with recommended lubricant.
General Guidelines for Iron Contaminant
Level
100-500 ppm
Normal
500-800 ppm
Caution - Abnormal Sample. Change oil and retake sample
after 50 hours of operation. If second sample is above 500
ppm, remove hoist from service and perform tear-down
inspection to determine source of contamination.
DANGER
Failure to use proper type and viscosity of planetary gear
oil may contribute to intermittent brake clutch slippage
which could result in death, serious injury or damage to
property and equipment. Some gear lubricants contain
large amounts of Extreme Pressure (EP) and anti-friction
additives which may contribute to brake clutch slippage or
damage to brake friction discs or seals. Oil viscosity with
regard to ambient temperature is also critical to reliable
brake clutch operation. Our tests indicate excessively
heavy or thick gear oil may contribute to intermittent brake
clutch slippage. Ensure gear oil viscosity used in your
hoist is correct for your prevailing ambient temperature.
CAUTION
Hot oil may cause personal injury and/or burns to
unprotected skin. Make certain the oil has cooled to a safe
temperature (typically less than 110°F or 43°C) before
taking an oil sample, changing oil or servicing the hoist.
Summary of Contents for Grove GRT9165
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