Graco 24E512, Руководство по эксплуатации и ремонту

Страница: 27 / 54

Maintenance
3A0232E 27
Adjust Needle Packing
If there is a fluid leak at the rear of the needle assembly,
the packings can be tightened to stop the leak.
1. Follow Pressure Relief Procedure , page 22.
2. Loosen four screws (113) then remove trigger clamp
assembly (111). See page 34.
3. Use 7/16 in. wrench to tighten packing nut (906)
1/8th of a turn.
4. Re-pressurize and re-check for leaks in rear of nee-
dle. If leak remains, packings may need to be
replaced. If necessary, see
Replace Needle Pack-
ing on page 27.
5. Ensure needle flats are aligned with one another.
6. Install trigger clamp assembly on gun then perform
Trigger Clamp Adjustment Procedure on
page 18.
7. Trigger gun to check for smooth operation of mate-
rial needles. If material needles do not operate
smoothly, packings may need to be replaced.
Replace Needle Packing
NOTE: The needle packing is the seal (904) inside the
needle assembly (105). See pages 34 and 46.
1. Follow Pressure Relief Procedure , page 22.
2. Use 9/64 in. hex key to loosen the four screws (114)
on trigger clamp (111). Remove clamp. See
page 34.
3. Use 7/16 in. wrench to break loose then remove the
packing nuts (906). See page 46.
4. Remove needle (908).
5. Remove old packing from needle.
6. Liberally lubricate the new packing.
7. Install new packing onto needle. Install packing with
beveled edge facing rear of needle.
8. Install needle.
9. Install packing nuts and torque to 30 in-lb (3.4 N•m).
10. Ensure needle flats are aligned with one another.
11. Install trigger clamp assembly on gun then perform
Trigger Clamp Adjustment Procedure on
page 18.
NOTICE
Be careful not to overtighten trigger clamp assembly
as this will cause the material needles to bind and
cause material needles to operate incorrectly.
NOTICE
Needles bend easily. To prevent bending and damag-
ing the needles, be careful when using wrenches to
remove the needle packings.
NOTICE
Be careful not to overtighten trigger clamp assembly
as this will cause the material needles to bind and
cause material needles to operate incorrectly.