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Reassembly
1. Lubricate the o–ring and gasket of the new needle
assembly (21) with lightweight oil.
2. Guide the rear of the needle (22) through the front
of the housing (32) until the trigger flats are ex-
posed.
3. With the needle adjustment screw (22) held in a
vise sharply tug on the needle housing (32) to fully
seat the needle within the housing.
4. With a new gasket (18) in place, screw the new
seat (39) into the needle housing (31). Torque to
15–20 ft–lb (20–27 N.m).
5. With a new o–ring (9) in place, reattach the needle
housing (32) to the manifold block (31). Verify that
the trigger flats are engaged within the yoke (33).
Torque to 15–20 ft–lb (20–27 N.m).
6. Adjust the needle before operating the gun.
18
39
9
Fig. 4
12
684002
Operation
22
32
Adjusting the Needles
WARNING
NEEDLE ADJUSTMENT
Proper adjustment of the needle is essential to be
sure the trigger safety latch makes the gun inop-
erative when engaged. Improper adjustment may
allow the gun to be triggered, even with the trigger
safety latch engaged, resulting in serious bodily
injury including fluid injection and splashing in the
eyes or on the skin.
1. Follow the Pressure Relief Procedure described on
page 9.
2. Remove the spray tip and mixer from the gun.
3. Repressurize the system.
4. Maintaining firm metal to metal contact between
the gun and a metal waste container, trigger the
gun fully. Both materials should be dispensed
from the gun at the same time. If not, a "lead–lag"
condition exists.
5. If a "lead–lag" condition exists, adjust one of the
needles (22) with a flat blade screw driver until
there is no longer a "lead–lag" condition. Turning
the needle clockwise will cause the valve to open
later (correcting lead), turning counter–clockwise
will cause the valve to open sooner (correcting the
lag).
6. Upon releasing the trigger, the fluid should stop
flow immediately. Now engage the safety latch
and try to trigger the gun; no fluid should flow. If
the gun fails either test, adjust the needle again.
7. With the gun safety latch engaged, place a new
gasket (10) in the nut of the mixer. Screw the
assembly firmly onto the gun. Tighten with a
wrench.
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