10 306796
Service
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 6.
NOTES:
D If the gun keeps spraying after you release the
trigger, the valve rod (needle) may be obstructed,
worn or damaged, or it may need adjusting. Follow
the repair instructions below.
D Before servicing, be sure all necessary repair parts
are available.
D See the Parts Drawing on page 12.
Disassembly
1. Relieve the pressure and disconnect the dispens-
ing device and supply hose.
2. Unscrew the valve seat (19). Unscrew the pivot (9)
and remove the trigger (15).
3. Grasp the hex of the safety knob (4) with a 11/16
in. open end wrench and unscrew the knob as-
sembly from the gun housing (16).
4. Grasp the flats of the adjusting nut (13) with an
adjustable wrench and pull it out far enough to
loosen the capscrew (1) using a 3/32 in. socket
head wrench.
5. Use a 3/8 in. open end wrench to unscrew the
packing screw (14).
6. Push the valve rod (18) out the front of the valve.
7. Use a hooked pick to carefully remove the pack-
ings (10) and glands (11, 12) from the valve.
8. Clean all parts thoroughly in a compatible solvent,
dry and inspect for damage. Replace the parts as
needed. Disassemble and manually clean the
tip/guard assembly (26, 27) if they are dirty.
Reassembly
1. Lubricate the smooth shaft of the rod (18). Insert
the threaded end of the rod through the front of the
valve and through the back.
2. One at a time, slide the male gland (12), and the
six v-packings (10) (with the lips of the v-packings
facing the front of the valve) onto the valve rod and
slide them into the packing cavity. Insert the fe-
male gland (11) and press it gently into the packing
cavity to help seat the packings.
3. Screw the packing screw (14) loosely into the
cavity.
4. Install the trigger (20) and pivot (9).
5. Place a washer (2) on the valve rod and thread the
adjusting nut (13) onto it.
6. Hold the adjusting nut with an adjustable wrench.
Thread the capscrew (1) a few turns into the nut.
7. Check the trigger free play. Push the adjusting nut
(13) forward as far as possible and check for 1/8 to
5/16 in. (3 to 8 mm) free play. See Fig. 5. Adjust
the screw (1) as necessary, then tighten the ad-
justing nut.
8. Screw the safety knob (4) into the valve.
9. Screw the valve seat (19) into the front of the valve
and torque to 20–25 ft-lb (27–34 NSm). Be sure the
washer (3) is between the seat and trigger guard.
10. Tighten the packing screw (14) just enough to stop
leakage; overtightening results in leaking.
11. Reinstall the tip/guard assembly (26, 27) before
using the gun.
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