Low
High
Pump
Won’t
Excess
Reason and remedy
Vacuum
Pressure
Vacuum
Pressure
Overheat
Start
Noise
for problem.
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•
•
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Filter dirty. Clean or replace.
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•
•
•
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Muffler dirty. Clean or replace.
•
•
Valves dirty or valves bent.
Clean or replace.
•
•
Worn cup.
Repair or replace.
•
•
•
Relief valve set too high.
Inspect and adjust.
•
•
Relief valve set too low.
Inspect and adjust.
•
•
•
•
•
•
Plugged vacuum/pressure line.
Inspect and repair.
•
•
Collapsed vacuum line.
Inspect and repair.
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•
Low voltage, wonʼt start.
Check power source.
•
•
•
Voltage wrong.
Check power source.
•
•
•
Worn cup/piston hitting cylinder.
Replace.
•
•
Cylinder misadjustment.
Realign.
•
•
•
Leaky hose or check valve.
Replace.
•
•
•
•
•
Dirt or liquid on top of piston.
Inspect and clean.
•
•
•
•
•
Motor not wired correctly.
Check wiring diagram/line voltage.
•
•
•
Blown head gasket.
Replace.
TROUBLESHOOTING CHART
www.gastmfg.com
ISO 9001 & 14001 CERTIFIED
For repair parts ordering information and exploded product view, visit our website or
call us at the number listed below.
We have Gast Authorized Repair Facilities throughout the world. For the most up-to-
PART NO. 70 - 6900 G497PL (REV-H)
Gast Manufacturing, Inc.
2300 S. Highway M139
Benton Harbor, MI,49022
Ph: 269/926-6171
FAX: 269/925-8288
www.gastmfg.com
Gast Hong Kong
Unit 12, 21/F, Block B
New Trade Plaza
6, On Ping Street, Shatin
N. T. Hong Kong
Ph: (852) 2690 1066
Fax: (852) 2690 1012
www.gasthk.com
European Sales & Service
Headquarters
Gast Group Limited
A Unit of IDEX Corporation
Unit 11, The I O Centre
Nash Road
Redditch B98 7AS
United Kingdom
Tel: +44 (0) 1527 504040
Fax: +44 (0) 1527 525262
www.gastmfg.com
www.jun-air.com
