| PB Pump Daily Check Points |
All
Models | 1. Always drain the moisture trap after every load to prevent build-up of material in the trap. Excessive moisture on a regular basis means you should check the ball and seat of the primary shut-off. 2. Check coolant level to ensure adequate volumes for cooling. 3. Refer to your specific cooling method below. |
Air
Cooled | Check oil level in oil reservoir before operating. Oil provides pump lubrication - use only 10W-30 or equal viscosity non-foaming oil. |
Liquid
Cooled | Check lines and hoses for breaks or obstructions. In cold weather situations, allow ample time for hydraulics to warm up. If unit utilizes an air cooler, inspect for obstructions that may reduce performance. |
Oil
Cooled | Check level in hydraulic reservoir. Use a high quality, non-foaming, No. 10 SAE hydraulic oil. Note: If block off plates are used, the lubricating oil supply comes from the vacuum/pressure pump reservoir. If not used, supply comes from the hydraulic system reservoir. |
Water
Cooled | Check level in reservoir. Note: If block off plates are used, the lubricating oil comes from the vacuum/pressure pump reservoir. The addition of a lubricant specifically designed for water cooling systems should help prolong the life of the system. |
| Troubleshooting Guide for PB Vacuum Pressure Pumps |
| Low Vacuum or Pressure | 1. Check piping, hose and vacuum tank for air leaks.
2. Verify settings of relief valve(s) on tank.
3. Verify pump changeover handle is completely shifting from vacuum to pressure or vice-vera.
4. Check valves may be dirty or damaged.
5. Rotor shaft seals may be worn or defective.
6. Pump housing may be worn excessively (see chart).
| PB-3 | PB-10 | PB-8 | PB-9 | | Normal Bore Diameter | 8.268" | 8.268" | 10.850" | 10.850" | | Replacement Bore Diameter | 8.298" | 8.298" | 10.930" | 10.930" | |
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| Excessive Noise | 1. Vanes are dirty or sticking in rotor. Check primary shutoff and moisture trap on tank for contamination. Clean pump and associated piping.
2. Vanes are worn out - replace as required.
3. Bearing are worn or defective - replace as required.
4. Verify shaft input speed. Correct speed in +/- 20% of rated input speed (1000 or 540 RPM depending on model).
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| Vane Wear | Vane wear can be checked through the access hole located on the side of the pump housing. A new vane should be flush with the rotor diameter. Vane wear up to 3/8" is acceptable. Vanes in excess of 3/8" wear should be replaced. |
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| Difficulty Shifting Between Vacuum and Pressure | Check for build-up of dirt and contamination on the changeover valve and housing. Note: Liquid cooled models - adjust tension on valve tensioning nut. Maintain tension to produce 15psi max. pressure. |
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| Pump Runs Excessively Hot | 1. Verify pump operating temperature. 100 degrees Fahrenheit over ambient is normal. Severe operating conditions may extend temperature to 150 degrees Fahrenheit over ambient.
2. Verify lubricating pump is operating properly.
3. Pressure relief vlave on tank may be plugged or improperly adjusted. Set to maintain 15 psi max.
4. Vacuum pump may have been re-assembled incorrectly. Maintain .0075" minimu clearance between motor and housing.
5. Verify cooling fins and external areas of pump are clean and free of dirt.
Liquid Cooled Units:
1. Verify proper coolant level in reservoir and check coolant return filter.
2. Coolant circulation pump may be worn or defective.
3. Verify coolant hoses are not collapsing internally.
4. Hydraulic drive components (if used) may be defective. |
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| Pump Vibrates | 1. Pump rotor may be dirty or out of balalance.
2. Verify pump rotor shaft is not bent.
Liquid Cooled Units:
1. Verify pump rotor id full of cooling oil.
2. Site glass should be full of oil and free of air. Slowly run pump until air is purged from cooling system. This may take 20 minutes or more. Remove top plug if necessary to bleed air.
3. Coolant level in reservoir should be maintained at a level equal to or higher than the top of the vacuum pump. |
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| Pump Runs Backwards - Will Not Maintain Vacuum Pressure when Off | Dirty or defective check valves. This problem may also occur with excessive heat or low vacuum. |
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| Pump Lubricating Oil is Cloudy | Air Cooled Units:
1. Moisture in oil. Drain oil and discard, clean reservoir and refill.
2. Oil seals are worn or defective.
| PB-3 | PB-10 | PB-8 | PB-9 | | Normal Oil Consumption per 8 Hours | 1-2 Qts | 1-2 Qts | 2-4 Qts | 2-4 Qts | |
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| Pump Uses Excessive Amounts of Lubricating Oil | Air Cooled Units:
1. Oil usage is dependent upon pump speed and level of vacuum at which the unit is operated.
2. The relief hole(s) on the oiler may be plugged.
3. Lube pump is worn or defective.
4. Oil seals are worn or defective. |
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| Pump Uses Excessive Amounts of Cooling Oil or Blows Oil | Liquid Cooled Units:
1. Check back pressure on coolant return line. Pressure should not exceed 15-20 psi.
2. Replace coolant return filter on coolant reservoir, if used.
3. Coolant return lines or coolant heat exchanger, if used, are restricted or collapsed.
4. Pump seals/o rings are damaged.
5. Pressure test pump rotor at 15 psi maximum pressure. |
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| Pump Leaks Oil From the Coolant End | Liquid Cooled Units:
1. Loose bolts - tighten as required.
2. Defective seals.
3. Defective lube pump drive.
4. Defective gaskets.
5. Defective oil lines or fittings on lube pump.
6. Defective lube pump.
7. Check for excessive back pressure on coolant return line. Pressure should not exceed 15-20 psi.
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| Pump Leaks Oil From the Drive End | Liquid Cooled Units:
1. Loose bolts - tighten as required.
2. Defective seals.
3. Defective or missing o ring(s).
4. Defective gasket.
5. Drive hub freeze plug loose or missing.
6. Drive hub worn or defective.
7. Defective seal in hydraulic drive motor, if used.
8. Check for excessive back pressure on coolant return line. Pressure should not exceed 15-20 psi. |
