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TROUBLESHOOTING
PROBLEM
Pump won't start
Pump will not prime
(No discharge with
motor running)
Pump will not shut-off
(output line closed and
no leaks)
Leaks from pump head
or switch
Chapin Spot Sprayer Operator's Manual - English
CHECK
Correct voltage (12 - 13V) and electrical connections
Fuse or breaker
Pressure switch operation
Rectifer or motor for open or grounded circuit
Locked drive assembly
Correct voltage at switch
Debris in strainer
Restriction (kinks) in inlet / outlet tubes
Debris / swelling in inlet / outlet valves
Air trapped in outlet line or pump head
Correct voltage to pump
Debris in pump inlet / outlet valves
Loose drive assembly or pump head screws
Pressure switch operations / adjustments
Loose screws at switch or pump head
Switch diaphragm ruptured or pinched
Punctured diaphragm if fluid is present
5E
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