Adjust Valving Rod - Graco GX-7A Instructions Manual

Adjust Valving Rod

GX-7A and GX-7 400 Models Only
1. Perform the Pressure Relief Procedure, page 17.
2. Set the safety lock (H) to CLOSED (SERVICE).
H
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3. If attached, turn both manual valves (C) fully
clockwise to close
A
C
F . 14 Adjust the Valving Rod
IG
4. Connect the air line from the gun to the air source
to pressurize the air cylinder forward to the
CLOSED position.
5. Loosen the forward stop locknut (A).
6. Completely loosen the forward stop locknut (A) by
turning fully counterclockwise.
7. Slowly tighten the forward stop locknut (A) by
turning clockwise until a snug resistance is felt.
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CLOSED (SERVICE)
8. Loosen the forward stop locknut (A) with
approximately 1/6 of a counterclockwise turn.
NOTE: As a reference point, movement of one wrench
flat corresponds to 1/6 turn.
F . 15 1/6 Turn of Flat Wrench
IG
9. Tighten the forward stop locknut (A). Do not
overtighten. If locknut bottoms out before
resistance is felt, replace friction plug.
GX-7 DI Model Only
The valving rod (N) requires adjustment in only the
following instances:
- disassembly and service of the air cylinder
- changing the valving rod (N)
- changing the mixing module (ZAH)
1. Clean the gun according to Clean Spray Gun,
page 24.
2. Connect the air supply to the gun.
3. Loosen the rear seal retainer assembly (ZAP) one or
two turns.
4. Loosen the locknut from the valving rod (N) three or
four turns.
5. Set the safety lock (H) to OPEN.
6. Use a 5/16 in. nut driver through rear of the gun to
thread the valving rod (N) forward to engage the
PCD (ZAC). When the valving rod contacts the
PCD, tighten another 1/10 turn.
7. Carefully maintain position of the valving rod (N)
and tighten the locknut against the piston rod (K).
8. Retighten the rear seal retainer assembly (ZAP).
Optional Configuration
23