Graco Inc. 12004 User Manual
Troubleshooting
6
309739
Troubleshooting
Problem
Cause
Solution
Gun fails to dispense when trigger is
actuated
actuated
Material lodged in nozzle
Follow Pressure Relief Procedure,
page 5. Clear nozzle of blockage.
page 5. Clear nozzle of blockage.
Material supply, hose, passages,
clogged
clogged
Check material supply settings,
hoses, etc. for proper material supply.
hoses, etc. for proper material supply.
Verify integrity of trigger pin through
yoke. Repair or replace cartridge
assembly as necessary.
yoke. Repair or replace cartridge
assembly as necessary.
Gun fails to dispense when trigger is
engaged
engaged
Tension of trigger needs adjustment
Check spring tension adjustment at
rear of gun. Spring tension should be
adjusted to allow approximately 1/32
in. of free play on trigger.
rear of gun. Spring tension should be
adjusted to allow approximately 1/32
in. of free play on trigger.
Verify integrity of trigger pin through
yoke. Repair or replace cartridge
assembly as necessary.
yoke. Repair or replace cartridge
assembly as necessary.
Needle and seat adapter loose or
worn
worn
Check that seat adapter is tightened
firmly and flush to gun body.
firmly and flush to gun body.
Needle and seat adapter worn.
Replace components as necessary.
Replace components as necessary.
Seal leakage
Packing adjustment nut not snug
Worn seals and packings
Rebuild gun as necessary.
Material leaks from gun inlet swivel
Worn seals
Replace seals.