Graco Inc. 12004X - Manual (Page 6)

Troubleshooting
6 309739
Troubleshooting
Problem Cause Solution
Gun fails to dispense when trigger is
actuated Material lodged in nozzle Follow Pressure Relief Procedure,
page 5. Clear nozzle of blockage.
Material supply, hose, passages,
clogged Check material supply settings,
hoses, etc. for proper material supply.
Verify integrity of trigger pin through
yoke. Repair or replace cartridge
assembly as necessary.
Gun fails to dispense when trigger is
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.
Verify integrity of trigger pin through
yoke. Repair or replace cartridge
assembly as necessary.
Needle and seat adapter loose or
worn Check that seat adapter is tightened
firmly and flush to gun body.
Needle and seat adapter worn.
Replace components as necessary.
Seal leakage Packing adjustment nut not snug Follow Pressure Relief Procedure,
page 5. Tighten packing adjustment
nut.
Worn seals and packings Rebuild gun as necessary.
Material leaks from gun inlet swivel Worn seals Replace seals.