8
307–633
SERVICE
Adjusting the needle
See Fig 6.
WARNING
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 in-
jury, including fluid injection and splashing in the
eyes or on the skin.
1.
Hold the gun with the nozzle straight up so the trigger
falls onto the safety latch. Insert a flat blade screw-
driver into the rear port of the gun until it engages with
the slot (C) at the back of the needle.
NOTE: If the trigger does not touch the latch, turn the
needle clockwise until it does.
2.
With light pressure, hold the trigger against the latch.
Turn the needle counterclockwise until there is
enough tension for you to feel and see the trigger
raise slightly off the latch.
3.
Now turn the needle back (clockwise) 3/4 turn.
4.
Install the plug (3).
5.
To test the adjustment: Connect the fluid hose and
start the pump. Release the trigger safety latch and
trigger the gun into a grounded waste container.
Release the trigger – the fluid should stop flow-
ing immediately.
Engage the safety latch again and try to trigger
the gun – no fluid should flow.
If the gun failed either test, relieve pressure, discon-
nect the hose, and adjust the needle again.
6.
Screw the tip guard assembly tightely onto the gun.
Tighten with a wrench. See Fig 7.
Fig 6
CLOCKWISE
C
HOLD TRIGGER
AGAINST LATCH
3
0708
Fig 7
0704
TIP
