User's Manual

Service

311209R 11

Service

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

• gun valve may need adjustment,

• gun valve may be obstructed or damaged,

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

damaged.

Replace needle assembly (4) or seat (6) as

instructed on page 13.

2. Use Repair Kit 253553 for Manual Hot-Melt Guns

249512, 249513, 249514, 249515, 297273, and

297274.

Install New Heater Cartridge(s),

RTD Sensor, or Switch

1. Remove covers (9 and 16).

2. Pull terminal blocks (36) and insulation displace-

ment connectors (IDC) (38) out of handle. Loosen

the screw in the terminal block or cut off the IDC to

disconnect lead wires of failed components.

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

ate hole.

4. Feed new wires through conduit to the correct termi-

nal block or IDC. If using a terminal block, cut wires

to length and strip insulation before connecting.

If using an IDC, insert one new RTD wire and one

yellow wire through the IDC holes until the ends can

be seen in the window on the opposite side. Use pli-

ers to press down insert, then close the IDC cover.

When replacing switch (51) ensure tube (53) pro-

trudes from the back of the handle with its end near

the center of the switch body. Gently push wires

through the tube into the gun handle. See F

. 12.

5. Replace covers (9 and 16).

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.

. 12

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