Graco Husky 307 Instructions-Parts List Manual page 13

PROBLEM
There are air bubbles in the fluid.
There is fluid in the exhaust air.
The pump exhausts air at stall.
The pump exhausts air from the
clamps.
The pump exhausts air near the air
valve.
The pump leaks fluid from the
check valves.
Troubleshooting
CAUSE
The suction line is loose, or there is
a lack of thread sealant.
The diaphragm (401) is ruptured.
The manifolds (102) are loose or
the o-rings (108) are damaged.
The outer diaphragm plates (103)
are loose.
The diaphragm (401*) is ruptured.
The outer diaphragm plates (103)
are loose.
The air valve cup (5) or plate (13) is
worn.
The shaft seals (30}) are worn.
The clamps (111) are loose.
The air valve screws (15) are loose. Tighten the screws.
The air valve o-ring (19) is
damaged.
The o-rings (108) are worn or
damaged.
SOLUTION
Tighten the suction line. Use a com-
patible liquid thread sealant or
PTFE tape on connections.
Replace the diaphragm.
See page 23.
Tighten the manifold bolts (104) or
nuts (106); replace the o-rings
(108). See page 21.
Tighten the plates. See page 23.
Replace the diaphragm.
See page 23.
Tighten the plates. See page 23.
Replace these parts.
See pages 18, 19.
Replace the seals.
See page 23.
Tighten the clamp nuts (113).
See page 14.
See page 16.
Inspect; replace the o-ring.
See pages 18, 19.
Inspect; replace the o-rings.
See page 21.
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