Troubleshooting - Graco Husky 307 Instructions-Parts List Manual

WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 11.
PROBLEM
The pump will not cycle, or cycles
once and stops.
The pump cycles at stall or fails to
hold pressure at stall.
There is excessive air leakage from
the exhaust port.
The pump operates erratically.
12 308553

Troubleshooting

1. Relieve the pressure before checking or servicing
2. Check all possible problems and causes before
CAUSE
The air valve is stuck or dirty.
The detent link (22) is worn or
broken.
The springs (3, 6) and/or valve cup
(5) and plate (13) are broken or
damaged.
The check valves or o-rings (108)
are leaking.
The check balls (301) or seat (201)
are worn.
The check ball (301) is wedged in
the seat (201).
The air valve cup (5) or plate (13) is
worn.
The shaft seals (30}) are worn.
The suction line is clogged.
The check valve balls (301) are
sticking or leaking.
The diaphragm (401) is ruptured.
the equipment.
disassembling the pump.
SOLUTION
Turn the reset shaft (21).
Disassemble and clean the air
valve. See pages 18, 19.
Use filtered air.
Replace the detent link (22) and ball
(8). See pages 18, 19.
Replace these parts.
See pages 18, 19.
Replace these parts.
See page 21.
Replace these parts.
See page 21.
Replace the ball.
See page 21.
Replace these parts.
See pages 18, 19.
Replace the seals.
See page 23.
Inspect; clear the line.
Clean or replace the balls.
See page 21.
Replace the diaphragm.
See page 23.