Graco 248597 248647, Instructions-Parts List Manual

Page: 26 / 56

Troubleshooting
26 310648P
Troubleshooting
1.
Follow Pressure Relief Procedure, page 19,
before checking or repairing gun.
2.
Check all possible problems and causes before
disassembling gun.
CAUTION
To prevent cross-contamination of the gun’s wetted
parts, do not interchange A component (isocyanate)
and B component (resin) parts.
PROBLEM CAUSE SOLUTION
Gun does not fully actuate when trig-
gered. Piston safety lock engaged. Disengage piston safety lock, page
10.
Plugged muffler (22). Clean, page 24.
Damaged air valve o-rings (24). Replace, page 41.
Fluid does not spray when gun is fully
actuated. Closed fluid valves (12b). Open.
Plugged impingement ports. Clean, page 25.
Plugged check valves (36). Clean, page 38.
Gun actuates slowly or with delayed
action. Plugged muffler (22). Clean, page 24.
Damaged piston o-rings (16, 19). Replace, page 39.
Dirty air valve, or damaged o-rings
(24). Clean air valve or replace o-rings,
page 41.
Mix module nut (25) too tight. Loosen nut, then retighten, page 33.
Loose lock ring (11). Tighten, use tool if necessaryCon-
version Kit 248603, page 11.
Purge rod will not actuate. No air pressure. Connect air supply.
Low air pressure. Set air pressure above 80 psi (0.56
MPa, 5.6 bar).
Buildup on purge rod (31). Clean purge rod.
Pressure imbalance. Plugged impingement ports. Clean, page 25. Reinstall mix mod-
ule, page 34.
Plugged check valves (36). Clean, page 38.
Viscosities not equal. Adjust temperature to compensate.
See Drilling of Mix Modules, page 15.
Ratio not equal. See Drilling of Mix Modules, page 15.