Great Plains CDS-JohnBlue NGP Series Pumps - Manual (Page 23)

© 2013 CDS-John Blue Co. 23
TROUBLE SHOOTING
ISSUE PROBABLE CAUSE
Pump hard or impossible to prime Valves damaged or in wrong place
Debris lodged in valves
Suction line leaks or restriction
Pump set too low
Packing worn
Tank Valve Closed
Clogged suction strainer
Pump building too much pressure Boom orifices / nozzles wrong size
Debris lodged in discharge lines
Excessive ground speed
Low / Under Metering Valves damaged or in wrong place
Debris lodged in valves
Suction line leaks or restriction
Pump set too low
Excessive tire slippage
Clogged suction strainer
High / Over Metering Valves damaged or in wrong place
Debris lodged in valves
Excessive suction head pressure
Pump set too high
Fluid leaks through when stopped Valves damaged
Excessive suction head pressure
Debris lodged in valves
Fertilizer leaks out stuffing box vent hole Rod packing worn out
Pump using excessive oil Oil seals or o-rings worn / leaking
Pump leaking oil around oil seals Vent plug not installed or plugged
Pump turns hard or skids ground tire Excessive pressure or speed
Clutch Models
ISSUE PROBABLE CAUSE
Clutch face contact showing excessive wear Yoke position on shifter rod is too far out
Clutch won’t disengage Yoke position on shifter rod is too far in
Clutch won’t engage Check main spring for breakage
Check jaws for severe wear / non-engagement
Clutch doesn’t engage / disengage Manual – Check all manual components for operation
Electric – Check all wiring and actuator for operation
Hydraulic – Check hydraulics and cylinder for operation