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WARN Industrial Hoists
Trouble Shooting: Hydraulic Hoists
NOTE: Hydraulic system failures typically follow
the same pattern: a gradual or sudden loss of
pressure or flow resulting in a loss of motor
power. Any one of the system components
may be at fault. Refer to the table for general
recommendations. If necessary, consult a
knowledgeable hydraulics representative.
NOTE: See product data sheet for hydraulic
specifications.
Problem
Hoist won't operate
in either direction
Hoist will power-out
but not power-in
Hoist will power-in
but not power-out
or stalls during
power-out
Hoist operates in
both directions but
will not lift rated
load
Hoist vibrates
badly or is noisy
during lifting or
lowering of load
Possible cause
No hydraulic pressure
Geartrain, brake, or motor
failure
Brake assembled incor-
rectly
Load brake failure
Low system pressure or
excessive system back
pressure
Brake needs servicing
Mounting surface is not
flat. Tie rod or tie bar is
bent.
17
WARNING
PERSONAL INJURY
Failure to observe these instructions could
lead to severe injury or death.
Never use a relief valve that exceeds the
hydraulic motor pressure rating. Use of this
valve can overload the hoist.
Corrective action
Check hydraulic system schematic
and connections
Send hoist to authorized Warn Indus-
trial service center for repair
Repair or replace brake assembly
Service or repair load brake
Check system pressure at motor inlet
and outlet ports
Service or replace load brake
Check to make sure mounting
surface is flat to within +/- 0.020 in.
(0.50 mm). Replace tie rod or tie
bar if necessary. Check for bent or
cracked housings.
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