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26
TROUBLESHOOTING – FEED RATE CONTROL
PROBLEM
POSSIBLE CAUSE
SOLUTION
Adjustment ring will not turn
Seized variable cam
Apply Aquashield
®
to variable cam &
cam slot
Seized adjustment ring
Clean then lubricate ring with AquaShield
®
Adjustment ring turns,
Variable cam disengaged from ring
Re-insert 90˚ end into ring
output doesn’t change
Broken variable cam
Replace variable cam
Pump head does not rotate
Worn index plate
Turn over or replace index plate
Motor problem
Refer to Motor section
Pump head roller assembly stripped
Replace roller assembly
Index pin holder loose
Tighten holder into spider assembly
Index pin broken
Replace index pin and lifter assembly
Pump head rotates continuously
Variable cam
Replace or re-insert variable cam
Erratic indexing
Index plate worn
Turn over or replace index plate
Variable cam worn
Replace variable cam
Lifter worn
Replace index pin & lifter assembly
