Gast 75R Series User Manual
Page 8
Low
High
Pump
Won’t
Excess
Reason and remedy
Vacuum
Pressure
Vacuum
Pressure
Overheat
Start
Noise
for problem.
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Filter dirty. Clean or replace.
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Muffler dirty. Clean or replace.
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Valves dirty or valves bent.
Clean or replace.
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Worn cup.
Repair or replace.
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Relief valve set too high.
Inspect and adjust.
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Relief valve set too low.
Inspect and adjust.
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Plugged vacuum/pressure line.
Inspect and repair.
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Collapsed vacuum line.
Inspect and repair.
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Low voltage, won’t start.
Check power source.
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Voltage wrong.
Check power source.
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Worn cup/piston hitting cylinder.
Replace.
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Cylinder misadjustment.
Realign.
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Leaky hose or check valve.
Replace.
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Dirt or liquid on top of piston.
Inspect and clean.
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Motor not wired correctly.
Check wiring diagram/line voltage.
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Blown head gasket.
Replace.
TROUBLESHOOTING CHART
www.gastmfg.com
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PART NO. 70 - 6850 G496PL (REV-D)
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Benton Harbor, MI
49023-0097
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www.gastmfg.com
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Unit 12, 21/F, Block B
New Trade Plaza
6, On Ping Street,
Shatin
N. T. Hong Kong
Ph: (852) 2690 1008
Fax: (852) 2690 1012
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