Graco Husky 307 - Troubleshooting Pump Issues

12 308553
Troubleshooting
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 11.
1. Relieve the pressure before checking or servicing
the equipment.
2. Check all possible problems and causes before
disassembling the pump.
PROBLEM CAUSE SOLUTION
The pump will not cycle, or cycles
once and stops.
The air valve is stuck or dirty. Turn the reset shaft (21).
Disassemble and clean the air
valve. See pages 18, 19.
Use filtered air.
The detent link (22) is worn or
broken.
Replace the detent link (22) and ball
(8). See pages 18, 19.
The springs (3, 6) and/or valve cup
(5) and plate (13) are broken or
damaged.
Replace these parts.
See pages 18, 19.
The pump cycles at stall or fails to
hold pressure at stall.
The check valves or o-rings (108)
are leaking.
Replace these parts.
See page 21.
The check balls (301) or seat (201)
are worn.
Replace these parts.
See page 21.
The check ball (301) is wedged in
the seat (201).
Replace the ball.
See page 21.
There is excessive air leakage from
the exhaust port.
The air valve cup (5) or plate (13) is
worn.
Replace these parts.
See pages 18, 19.
The shaft seals (30}) are worn. Replace the seals.
See page 23.
The pump operates erratically. The suction line is clogged. Inspect; clear the line.
The check valve balls (301) are
sticking or leaking.
Clean or replace the balls.
See page 21.
The diaphragm (401) is ruptured. Replace the diaphragm.
See page 23.