Service

After adjusting or servicing gun, ensure that fluid will not trigger on when trigger lock is engaged. If fluid does flow, gun is not assembled correctly or trigger lock is damaged. Reassemble gun or return it to your nearest Graco distributor. Do not use gun until the problem is corrected.

1.If fluid continues to flow after trigger is released:

•gun valve may need adjustment,

•gun valve may be obstructed or damaged,

•or needle assembly (4) or seat (6) may be worn or damaged.

Replace needle assembly (4) or seat (6) as instructed on page 12.

2.Use Repair Kit 253553 for Manual Hot-Melt Guns 249512, 249513, 249514, 249515, 297273, and 297274.

All models except 249514 and {

249515

All {

Models

FIG. 12: 8 Pin, 240 Volt Shown

Service

Install New Heater Cartridge(s), RTD Sensor, or Switch

1.Remove covers (9 and 16).

2.Pull terminal block (36) out of handle and discon- nect lead wires of failed components.

3.Gently slide new heater(s) or sensor into appropri- ate hole.

4.Feed new wires through conduit to terminal block (36) and connect after cutting to length and strip- ping.

5.Use an ohm meter to check:

a.Heater pins 1 to 2, 445 Ω +/- 35 Ω .

b.RTD sensor pin 3 to 4, 108 Ω +/-1 Ω at 70°F (21°C).

c.Continuity to gun body from pin 8.

d.No continuity from pins 1-7 to gun body or con- nector shell, or ground pin 8.

Viewed from wire end of connector

311209J