Troubleshooting - Graco 249514 Operation And Parts Manual

Troubleshooting

Troubleshooting
Some solutions require disassembling the gun. To
help prevent serious injury, relieve pressure and
disconnect the electrical cable before checking or
servicing the equipment.
To help prevent serious injury from burns, do not
touch hot fluid dispensing from the gun.
Problem
Material leaks from front of gun
body
Material leaks from back of gun
body
Gun does not shut off
Gun does not heat material
10
Cause(s)
Seat or packing is worn
Obstruction inside gun
Worn needle
Needle seal or packing is worn
Needle or seat is worn
Spring is broken or not installed
correctly
Obstruction inside gun
Loose heater wires
Loose sensor wires
Heater cartridge failed
Sensor failed
Temperature controller failed
No power to heating circuitry
1. Follow Pressure Relief Procedure, page 8, before
checking or repairing the gun.
2. Check all possible problems and causes before
disassembling gun.
3. Disconnect the electrical cable.
Replace the seat (6) or packing (47).
Remove the seat (6). Check and replace if
necessary.
Check and replace needle (4a) if necessary.
Replace seals (4c) or packing (4d).
Replace needle (4a) or seat (6).
Check and replace spring (14) if necessary.
Remove the seat (6). Check and replace if
necessary.
Check and reconnect wire connections.
Check and reconnect wire connections.
Replace failed heater.
Replace failed sensor.
See your Therm-O-Flow
Solution(s)
®
200 manual.
311209W