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. |
| Disc brake does not release. | Pressurize disc brake release port and check for leakage. Replace brake |
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| piston seals if leakage is found. Ensure air pressure at inlet to disc brake is |
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| at least 50 psig (3.4 bar/340 kPa). |
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| Shipping plugs may still be in | Remove shipping plugs in valve and motor exhaust ports. |
| place. |
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| Drum brake does not release. | Disengage manual drum brake, or refer to ‘Automatic Drum Brake |
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| Adjustment’ on page 26. |
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|
Load continues to move when | Drum brake is slipping. | Check drum brake adjustment on page 26 and brake band lining wear. |
winch is stopped. |
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|
Winch is overloaded. | Reduce load to within rated capacity. | |
| Winch motor controls sticking. | Check pendant/throttle levers spring return to normal (neutral) positions |
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| when released. |
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|
Winch does not lift load or | Motor may be damaged. | Remove and disassemble motor as described in the “MAINTENANCE” |
does not lift rated capacity. |
| section on page 30. Examine all parts and replace any that are worn or |
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| damaged. |
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| Insufficient air supply. | Verify air supply pressure and volume at winch inlet meets requirements |
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| listed in the “SPECIFICATIONS” section on page 5. Clean air line filter. |
Throttle or pendant lever | Motor may be damaged. | Disassemble and clean motor and replace any broken or damaged parts. |
moves but winch does not |
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|
Insufficient air supply. | Ensure air pressure at winch inlet is at least 90 psig (6.3 bar/630 kPa) at | |
operate. |
| rated volume. Clean air line filter. |
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|
| Air leak. | Check hose and fitting connections. Inspect hose(s) for breaks. Tighten |
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| fittings and repair or replace hoses as necessary. |
Motor runs hot or makes | Low oil level. | Check oil level in motor. Add oil as required to obtain proper level. |
excessive noise during |
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|
Improper lubrication. | Replace oil with type recommended in “LUBRICATION” section on | |
operation. |
| page 19. Set lubricator to provide 6 to 9 drops of oil per minute at |
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| maximum winch operating capacity. |
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| Water in oil. | Drain and refill with recommended oil. Operate winch with no load |
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| slowly, in both directions. If noise still exists or motor overheats |
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| disassemble and repair motor. |
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| Damaged or broken piston or | Disassemble and repair motor. |
| connecting rod. |
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|
Winch runs slow. | Improper hose or fitting sizes. | Check fittings, connections and hoses for correct size and length. Replace |
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| parts that may cause restricted air flow. Inspect air line filter. |
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| Motor may be damaged. | Remove and disassemble motor as described in the “MAINTENANCE” |
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| section on page 30. Inspect all parts and replace all worn or damaged |
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| parts. |
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| Brake(s) not releasing. | Refer to brakes in “MAINTENANCE” section on page 26. |
Air lines freeze. | Water in air supply. | Install or drain air system moisture traps, moisture collecting air receivers |
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| and compressor aftercoolers. After corrective action has been taken, |
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| disconnect lines at winch inlet and purge with clean, dry air or nitrogen. |
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Throttle lever hard to actuate, | Valve body sticking in | Lubricate valve through grease fitting with recommended lubricant. Refer |
or lever does not spring return | bushing. | to ‘Air Throttle’ on page 19 in “LUBRICATION” section. |
to neutral. |
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Automatic Drum Brake: |
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Brake cylinder will not | Drum brake out of adjustment. | Adjust drum brake to maintain correct cylinder stroke. |
release. |
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Leaking cylinder seals. | If air is noticed escaping from cylinder breather when attempting to | |
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| release brake, replace or repair cylinder. |
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| Dirty filter in air supply. | Clean or replace filter. |
| Faulty dump valve. | Check dump valve exhaust port. Air should exhaust when control valve |
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| handle is in neutral. If no air escapes, replace dump valve. |
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24 | MHD56037 - Edition 5 |
