Graco Husky 1050HP Repair Parts page 9

Problem
Problem Problem
Air bubbles in fluid.
Exhaust air contains fluid being
pumped.
Moisture in exhaust air.
Pump exhausts excessive air at
stall.
Pump leaks air externally.
Pump leaks fluid externally from
joints.
Pump will operate in the Low
pressure setting, but will not operate
in the High pressure setting.
334390E
All manuals and user guides at all-guides.com
Cause
Cause Cause
Suction line is loose.
Diaphragm ruptured.
Loose manifolds, damaged seats or
o-rings.
Pump cavitation.
Loose diaphragm shaft bolt.
Diaphragm ruptured.
Loose diaphragm shaft bolt.
High inlet air humidity.
Worn air valve cup or plate.
Damaged air valve gasket.
Damaged pilot valve.
Worn shaft seals or bearings.
Air valve or fluid cover screws loose. Tighten.
Diaphragm damaged.
Air valve gasket damaged.
High/Low valve shift lever is not fully
seated into the High or Low position.
Loose manifold screws or fluid cover
screws.
Manifold o-rings worn out.
The hoses for the High/Low valve
are not installed correctly.
Troubleshooting
Solution
Solution Solution
Tighten.
Replace.
Tighten manifold bolts or replace
seats or o-rings.
Reduce pump speed or suction lift.
Tighten.
Replace.
Tighten or replace.
Use drier air supply.
Replace cup and plate.
Replace gasket.
Replace pilot valves.
Replace shaft seals or bearings.
Replace diaphragm.
Replace gasket.
Shift the lever all the way into either
High or Low position.
Tighten manifold screws or fluid
cover screws.
Replace o-rings.
Install hoses as shown in the figure
on page 10.
9