Needle Repair - Graco 311001G Instructions And Parts List

4. Inspect the o-rings (5e*, 5f*, and 5g*) in place.
Carefully remove the o-rings from the diffuser hous-
ing (5a) and replace if necessary.
5. Remove the seat nut (5d), seat (5c) and seat gasket
(5b, carbide models only) using a 7/32 in. hex
wrench.
6. Inspect the seat (5c) and seat gasket (5b) and
replace if necessary.
7. Reinstall the seat gasket (5b, carbide models only),
seat (5c), and seat nut (5d). Torque to 45-50 in-lb.
Be sure not to overtighten the nut.
• When reinstalling the carbide seat (5c), the
tapered end of the seat (red side) must point
toward the gun tip.
• The plastic seat (5c, model 288844 guns), can
be reinstalled in either direction. Do not reverse
the direction of the plastic seat if it is worn. The
seat must be replaced if it is worn.
5c
5g*
5a
5e*
5f*
30
F . 37
IG
311001G
1
5d
5b
(carbide only)
TI6572A

Needle Repair

1. Remove the diffuser, see Seat Repair, page 20.
2. Remove the trigger pivot pin nut (14‡), pivot pin
(13‡), and trigger (3‡) using the gun tool (30) and
nut driver (29). See F
13‡
3‡
F . 38
IG
3. Remove the fluid needle assembly (2) from the front
of the gun by using the nut driver tool (29). If the
needle is bent or damaged, or the packing is worn
or leaking, replace the entire needle assembly. If
replacement is necessary, be sure to remove the
o-ring (2a*) as it may stick inside the gun body. See
F . 39.
IG
29
F . 39
IG
. 38.
IG
14‡
TI6574A
1
2a*
2
TI6575A
Repair
21