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20 MHD56087 - Edition 4
REVIEW COPY 6
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21
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02
TROUBLESHOOTING
This section provides basic troubleshooting information. Determination of specific causes to problems are best identified by thorough
inspections performed by personnel instructed in safety, operation and maintenance of this equipment. The chart below provides a brief
guide to common winch symptoms, probable causes and remedies.
SYMPTOM CAUSE REMEDY
Winch will not operate. No air supply to winch. Check air supply line connections and hoses.
Winch is overloaded. Reduce load to within rated capacity.
Emergency Stop Valve engaged. Reset Emergency Shut-off valve.
Shipping plugs may still be in place. Remove shipping plugs in valve.
Load continues to move
when winch is stopped.
Brake(s) slipping. Check brake band adjustment and brake band lining wear. Disassemble and
inspect disc brake. Refer to “MAINTENANCE” section on page 24.
Winch motor controls sticking. Check pendant/throttle levers spring return to normal (neutral) position when
released.
Winch is overloaded. Reduce load to within rated capacity.
Winch does not lift/pull
load.
Motor may be damaged. Remove and disassemble motor. Examine all parts and replace any that are
worn or damaged.
Winch is overloaded. Reduce load to within rated capacity.
Insufficient air supply. Verify air supply pressure and volume at winch inlet meets the requirements.
Refer to “SPECIFICATIONS” section on page 5. Clean air line filter.
Throttle lever or
pendant lever moves
but winch does not
operate.
Motor may be damaged. Disassemble and clean the motor and replace any broken or damaged parts.
Insufficient air supply. Ensure the air pressure at the winch inlet is at least 90 psig (6.3 bar/630 kPa)
at rated volume. Clean air line filter.
Air leak. Check hose and fitting connections. Inspect hose(s) for breaks. Tighten
fittings and repair or replace hoses as necessary.
Emergency Stop Valve engaged. Reset Emergency Shut-off valve.
Motor runs hot or
makes excessive noise
during operation.
Low oil level. Check oil levels in the motor. Add oil as required to obtain the proper level.
Improper lubrication. Replace oil with type recommended in “LUBRICATION” section on page
21. Set lubricator to provide 6 to 9 drops of oil per minute at maximum
winch operating capacity.
Water in oil. Drain and refill with recommended oil. Operate winch with no load slowly,
in both directions. If noise still exists or motor overheats disassemble and
repair motor.
Damaged or broken piston or
connecting rod.
Disassemble and repair motor.
Winch runs slow. Improper hose or fitting sizes. Check fittings, connections and hoses for correct size and length. Replace
parts that may cause restricted air flow. Inspect air line filter.
Motor may be damaged. Remove and disassemble motor. Inspect all parts and replace all worn or
damaged parts.
Brake(s) not releasing. Refer to brakes in “MAINTENANCE” section on page 24.
Air lines freeze. Water in air supply. Install or drain air system moisture traps, moisture collecting air receivers
and compressor aftercoolers. After corrective action has been taken,
disconnect lines at winch inlet and purge with clean, dry air or nitrogen.
Throttle lever hard to
actuate, or lever does
not spring return to
neutral.
Valve body sticking in bushing. Lubricate valve through grease fitting with recommended lubricant. Refer to
‘Air Throttle’ on page 22 in “LUBRICATION” section.