HOIST AND COUNTERWEIGHT RT9130E-2 SERVICE MANUAL
5-2 Published 11-22-2016, Control # 345-12
zero and the motor control valve spool closes, thus blocking
all flow of oil out of the hoist motor. This same pressure
decay allows the spring applied pressure released hoist
brake to apply when the load is fully stopped. This brake acts
as a “parking brake” and holds the load in the stopped
position.
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.
WARNING
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.
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