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NOTE: Repair kits are available. See page 7 for the
kits for your gun model. For the best results, use all
the new parts in the kit. Kit parts are marked with an
asterisk, for example (2*).
NOTE: See the Parts Drawing on page 7 when
disassembling and reassembling the gun.
Disassembly
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 5.
1. Relieve the pressure.
2. Disconnect the gun from the hose.
3. Unscrew the nozzle nut (11) and nozzle (not
shown) from the seat (5*).
4. Unlock the trigger safety. See Fig. 1.
5. Depress the trigger (3) and remove the seat (5*)
from the gun.
CAUTION
Failure to depress the trigger while removing the seat
may damage the needle.
6. Loosen the hexnut (12) on the needle (2*) while
holding the adjustment screw (A) with a screwdriv-
er.
7. Unscrew the needle (2*) by turning the adjustment
screw (A) until the needle is unthreaded.
8. Remove the hexnut (12) and remove the needle
(2*) through the front of the gun.
6
308-807
Service
Reassembly
1. Apply grease to the needle (2*) o-rings.
2. Put the needle (2*) in the gun, screwing the hexnut
(12) on the needle as it is going in.
3. Start threading the adjustment screw (A) until it
engages the threads of the needle (2). Continue
threading until the trigger (3) raises 1/2 in. (13
mm).
4. Grease the threads of the seat (5*) and the gasket
(10*)
5. Press the trigger (3) and install the gasket (10*)
and seat (5*).
6. Lift the trigger (3) and lock the trigger safety.
7. Trigger adjustment:
a. Turn the adjustment screw (A) clockwise until
the trigger (3) travels as far up as possible.
b. Turn the adjustment screw (A) counterclock-
wise until the trigger (3) stops falling, then turn
an additional 1/8 turn.
c. Tighten the hexnut (12) against the adjustment
screw (A). Hold the adjustment screw (A) to
prevent it from turning. Torque the hexnut to
18–22 in-lb (2.03–2.46 NSm).
d. Test the trigger safety (B) to ensure that it
operates properly. If the trigger safety does not
operate properly, loosen the hexnut (12) and
return to step 7a.
8. Screw the nozzle nut (11) and nozzle (not shown)
back onto the front of the gun.
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