Troubleshooting

PROBLEM

CAUSE

SOLUTION

Fluid in exhaust air.

Diaphragm ruptured.

Replace. See pages 19–22.

 

 

 

 

Loose fluid side diaphragm plate

Tighten or replace. See pages

 

(105).

19–22.

 

 

 

Pump exhausts excessive air at

Worn air valve block (7), o-ring (6),

Inspect; replace. See pages 16–17.

stall.

plate (8), pilot block (18), u-cups

 

 

(10), or pilot pin o-rings (17).

 

 

 

 

 

Worn shaft seals (402).

Replace. See pages 19–22.

 

 

 

Pump leaks air externally.

Air valve cover (2) or air valve cover

Tighten screws. See page 17.

 

screws (3) are loose.

 

 

 

 

 

Air valve gasket (4) or air cover

Inspect; replace. See pages 16–17,

 

gasket (22) is damaged.

23–24.

 

 

 

 

Air cover screws (25) are loose.

Tighten screws. See pages 23–24.

 

 

 

Pump leaks fluid externally from ball

Loose manifolds (102, 103), dam-

Tighten manifold bolts (106 and

check valves.

aged seal between manifold and

112) or replace seats (201) or

 

seat (201), damaged o-rings (202).

o-rings (202). See page 18.

 

 

 

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Graco 308550ZAD important safety instructions Troubleshooting