| Normal Service Items |
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| Packing, wipers and bushings are considered normal service or replacement items. These items are subject to contamination from external and internal foreign materials, many of which are abrasive in nature, causing abnormal wear or damage to the parts, to the extent replacements are required.
Cylinders may be subject to leaking oil past the seal for various reasons requiring adjustment of the head/packing nuts. This is considered a normal installation and field service adjustment to correct the leakage.
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 Procedure for adjusting headnuts on Telescopic Cylinders |
| Bleeding air from Single-Acting Telescopic Cylinders |
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 Warning! |
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Before making adjustments or repairs to the cylinder when mounted in the unit, use strong, heavy, positive supports to hold the body from accidentally lowering which can cause severe injury or death and/or damage to the unit and cylinder. Place control valve in the lower position to insure the pressure is relieved in the cylinder. High pressure can cause severe injury or death and/or damage to the unit and cylinder.
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Procedure for adjusting headnuts on Telescopic Cylinders
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| A. For leaking cylinders: |
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1. Loosen set screw(s) in headnut of leaking stage(s).
2. Tap headnut lightly around circumference with a hammer.
3. Using a chain wrench, back headnut off one half to one full turn. If plunger turns as you are turning the headnut, the plunger will have to be held, preferably with a strap wrench.
4. Cycle cylinder two or three times to reset vee ring packing.
5. Tighten headnut one half turn farther than it was loosened.
6. Tighten set screw(s).
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| B. For mis-sequencing cylinders: |
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1. Loosen set screw in headnut on stage that is sticking.
2. Tap headnut lightly around circumference with a hammer.
3. Using a chain wrench, back off headnut one half turn.
4. Cycle cylinder. If cylinder still mis-stages, turn headnut another half turn.
5. Cycle cylinder. If cylinder still mis-stages, tighten the headnut on the next stage that is extending. If plunger turns as you are turning the headnut, the plunger will have to be held, preferably with a strap wrench.
6. Tighten set screw(s).
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| Bleeding air from Single-Acting Telescopic Cylinders |
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1. Empty the dump body of any material.
2. Remove the cover plate from the doghouse of the dump body to access the cylinder bleeder valve.
3. Fully extend the cylinder, raising the empty dump bed.
4. Lower the dump bed to within one foot from the frame.
5. Turn the bleeder valve in a counterclockwise direction. This opens the valve and allows the air to escape from the cylinder.
6. When a steady stream of oil comes from the bleeder, turn the valve in a clockwise direction until it is closed.
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| NOTE: |
| For consistent operation of telescopic cylinders, it is advisable to bleed the air from the cylinder weekly. |
| If these procedures fail to correct the problem, contact the factory or an authorized service center for further instructions. |
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