Troubleshooting Guide - Graco 206405 Instructions And Parts List

WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
Relieve the Pressure before you check or service any
system equipment.
Problem
Pump fails to operate
Continuous air exhaust
Erratic pump operation
Pump operates, but output is low
on the up stroke
Pump operates, but output is low
on the down stroke
Pump operates, but output is low
on both strokes
*Follow the Pressure Relief Procedure on page 8. Disconnect the fluid hose. If the pump starts when the air is
turned on again, the hose or gun is clogged.
12 306531
Troubleshooting
NOTE: Check all other possible problems and solu-
tions before disassembling the pump.
Cause
Low air supply pressure or restricted air
lines
Closed valves
Clogged fluid lines, hoses, valves, etc.
Damaged air motor
Empty fluid supply container
Worn or damaged air motor gasket,
packing, seal, etc.
Empty fluid supply container
Held open or worn intake valve or
piston packings
Held open or worn piston
or packings
Held open or worn intake valve
Low air supply pressure or
restricted air lines
Closed valves
Empty fluid supply container
Clogged fluid lines, hoses, valves, etc.
Packing nut too tight
Loose packing nut or worn packings
WARNING
Never operate the pump with the warning plate
(20) or the identification plate (40) removed. These
plates protect your fingers from pinching or ampu-
tation by moving parts in the air motor.
Solution
Increase air supply; clear*
Open
Clear*
Service air motor
Refill and reprime, or flush
Service air motor
Refill and reprime, or flush
Clear; service
Clear; service
Clear; service
Increase air supply; clear*
Open
Refill and reprime, or flush
Clear*
Loosen
Tighten; replace