HOISTS AND COUNTERWEIGHT RT880E SERVICE MANUAL
5-2 Published 11-10-2014, Control # 524-00
MAINTENANCE
Warm-up Procedure
A warm-up procedure is recommended at each start-up and
is essential at ambient temperatures below +40°F (4°C).
The engine should be run at its lowest recommended RPM
with the hydraulic hoist control valve in neutral allowing
sufficient time to warm up the system. The hoist should then
be operated at low speeds, forward and reverse, several
times to prime all lines with warm hydraulic oil, and to
circulate gear lubricant through the planetary gear sets.
Routine Maintenance and Inspection
Hoisting gear assemblies must receive proper maintenance
and inspection in order to provide satisfactory long term
operation. It is extremely important that maintenance
personnel recognize that deterioration of critical internal
components within the hoist reduction unit can occur. The
service life and reliability of the hoist can be substantially
reduced by such factors as the following:
• High cycle operation
• Operating in high ambient temperatures
• High external contamination, such as dusty or sandy
conditions
• Level of maintenance
Weekly or at 40 Hours of Operation (whichever comes
first)
1. Check the hoist oil level. Use only the manufacturer’s
recommended oil when filling.
2. Inspect for any oil leaks from the hoist gearbox.
Every Three Months or 300 Hours of Operation
(whichever comes first)
Lubricate the hoist cable follower and idler arm bearings.
Refer to Hoist, page 9-29 for recommended grease.
Annually
1. Replace the oil in the hoist gearbox, refer to Hoist, page
9-29. We recommend having the used hoist oil tested by
a hydraulic oil analysis provider, which can give advance
warning of developing wear patterns. Any sign of abnor-
mal contamination should be treated seriously, with an
examination of the internal components of the hoist con-
ducted at the earliest opportunity.
2. Check for correct function of the hoist brake by carrying
out a high line pull load test, see Functional Check, page
5-4. Ensure the brake holds without creeping and that
the hoist control is correct.
NOTE: The function of the hoist brake should be checked
more often under extreme or abnormal operating
conditions.
Every Ten Years or 10,000 Hours (whichever comes
first)
As part of a preventative maintenance program, we
recommend that hoist assemblies be opened in a properly
controlled workshop environment. The major internal
components (gears, spline couplings, shafts, etc.) should be
examined for damage and/or wear. New components should
be installed if any are found to be worn or if there is evidence
of heat or other damage. Reassemble the hoist using all new
seals, bearings, fasteners, washers, brake discs, brake
stators, sprag clutch, and springs.
A comprehensive hoist line pull and load holding test must
be carried out following any such repair work.
Manitowoc Crane Care offers prepackaged kits that include
all the seals, bearings, fasteners, washers, brake disks,
brake stators, sprag clutch, and springs that are required for
reassembling the hoist after inspection. During the
inspection, if components not included in the kit are found to
be worn or damaged, contact your Grove Distributor or
Manitowoc Crane Care to order replacements.
Removal
1. Remove all cable from the hoist drum.
2. Tag and disconnect the hydraulic lines to the hoist. Cap
or plug all lines and openings.
3. Tag and disconnect the electrical wires to the hoist
rotation indicator sensor box.
4. Tag and disconnect the electrical wires to the hoist hi-
speed solenoid valve.
DANGER
Crushing Hazard!
Failure to properly warm up the hoist, particularly under
low ambient temperature conditions, may result in
temporary brake slippage due to high back pressures
attempting to release the brake, which could result in
property damage, severe personal injury or death.
DANGER
Failure to implement and adhere to a hoist inspection and
maintenance program may result in damage to the crane,
other property damage, and/or serious injury or death to
persons working on or near the crane.
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