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Operation Basics
311321H 15
Mixing Module and PCD
Installation
1. Install mixing module:
a. Disconnect gun from coupling block.
b. Connect air supply to gun.
c. Set safety stop to OPEN.
d. Hold down trigger and place module
over tip of valving rod.
e. Align keying pin with hole in gun block
and push in firmly (GX-7 DI model only).
f. Install front packing into module retainer
(GX-7 model only).
g. Install module retainer, hand tight.
Release trigger.
h. Use wrench to strongly tighten module
retainer (250 in.-lbs.).
GX-7 DI model only: use wrench to
tighten module retainer (150 in.-lbs.).
DO NOT OVERTIGHTEN.
2. Install PCD:
a. Disconnect air supply from gun.
b. Loosen forward stop screw (GX-7
model only).
c. Turn forward stop nut clockwise (as
viewed from front of gun) 1-2 turns
(GX-7 model only).
d. Slightly loosen rear seal retainer
assembly.
e. Remove safety stop.
f. Use wrench to loosen piston locknut.
Turn valving rod rearward as far as it will
turn.
g. Place and orient PCD over mixing mod-
ule retainer.
h. Install PCD retainer and hand tighten
(GX-7 DI model only).
i. Install PCD retainer and wrench tighten
(GX-7 model only).
3. Adjust valving rod. See procedure for
appropriate gun model.
4. Set safety stop to OPEN position.
5. Check adjustment of valving rod:
a. With air supply connected, hold down
gun trigger and loosen PCD retainer.
Release trigger.
b. Hand tighten PCD retainer.
c. While maintaining tightening torque,
trigger gun. Retainer should rotate
approximately 1/10 of turn.
d. Release trigger.