Troubleshooting - Ingersoll-Rand 7700-E Series Installation, Operation And Maintenance Instructions

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Troubleshooting

Hoist will not operate - check for:
1. Excessive Load.
2. Sufficient air pressure.
3. Clogged air intake screen.
4. Clogged valves.
5. Proper brake adjustment.
6. Proper installation of Roll Pin in Control Rod and Gear (34022).
Unable to regulate hoist speed by controls check for:
1. Proper brake adjustment.
Hoist will not hold load in suspension - check for:
1. Excessive load.
2. Worn or oily brake linings.
3. Proper brake adjustment.
4. Proper timing of gears in head.
Hoist loses power - check for:
1. Sufficient air pressure.
2. Clogged air intake screen.
3. Clogged muffler screen or filler.
Hoist lifting or lowering speed differs from rated speed at full load - check for:
1. Proper timing of gears in Head.
Hoist control lever will not return to horizontal position - check for:
1. Bent control rod.
2. Binding of control rod.
3. Proper brake adjustment.
4. Lack of lubrication in pendant control cylinders.
5. Proper timing of gears In head.
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7700-et series

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