National Vacuum Equipment WPT 480/P Owner's Manual And Operating Instructions - Troubleshooting
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WPT Series | 21
www.natvac.com | 800.253.5500
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Before operating the pump, bleed any air from the
system by loosening the thermometer.
Troubleshooting
WPT 480/P
WPT 600/P
WPT 720/P
Pump overheats
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Inlet water temperature too high
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Inadequate water flow
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No oil in pump
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Oil adjustment set too lean
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RPM too fast
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Prolonged operation
Too much oil use
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Oil adjustment set too rich
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Oil seals defective
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Cracked pump body
Pump doesn’t turn
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Broken vane
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Frozen
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Pump endplate bolts too tight
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Faulty PTO or drive set up
No vacuum or pressure in tank
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Suction valve in neutral
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Defective seal or vanes
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Pump not driven fast enough
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Check valve or suction line clogged