Troubleshooting - Graco Husky 1050HP Repair Parts

Troubleshooting

Troubleshooting Troubleshooting Troubleshooting
Problem Problem Problem
Pump cycles but will not prime.
Pump cycles at stall or fails to hold
pressure at stall.
Pump will not cycle, or cycles once
and stops.
Pump operates erratically.
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Cause Cause Cause
Pump is running too fast, causing
cavitation before prime.
Check valve ball severely worn or
wedged in seat or manifold.
Seat severely worn.
Outlet or inlet clogged.
Inlet or outlet valve closed.
Inlet fittings or manifolds loose.
Manifold o-rings damaged.
Worn check valve balls, seats, or
o-rings.
Air valve is stuck or dirty.
Check valve ball severely worn and
wedged in seat or manifold.
Pilot valve worn, damaged, or
plugged.
Air valve gasket damaged.
Dispensing valve clogged.
High/Low valve shift lever is not fully
seated into the High or Low position.
Clogged suction line.
Sticky or leaking check valve balls.
Diaphragm ruptured.
Restricted exhaust.
Pilot valves damaged or worn.
Air valve damaged.
Air valve gasket damaged.
Air supply erratic.
Exhaust muffler icing.
Solution Solution Solution
Reduce air inlet pressure.
Replace ball and seat.
Replace ball and seat.
Unclog.
Open.
Tighten.
Replace o-rings.
Replace.
Disassemble and clean air valve.
Use filtered air.
Replace ball and seat.
Replace pilot valve.
Replace gasket.
Relieve pressure and clear valve.
Shift lever all the way into either
High or Low position.
Inspect; clear.
Clean or replace.
Replace.
Remove restriction.
Replace pilot valves.
Replace air valve.
Replace air valve gasket.
Repair air supply.
Use drier air supply.
334390E