Assembly - Nordson A7A Customer Product Manual

12
A7A Single and Dual Automatic Airless Spray Guns

Assembly

Part 1072640A
NOTE: Lubricate all O-rings with Parker O-Lube or equivalent before
installing.
See Figure 5.
1. If removed, install the O-ring (10) in the groove in the body (11).
2. Install the ball or needle (16A−D) on the end of the packing
cartridge (15).
3. Install the packing cartridge in the body.
4. Assemble the seat and gun body:
Single Chamber:
a. Install the O-ring (17) on the seat (19).
b. Install the seat on the body and tighten the screws (18) securely.
Dual Chamber:
a. Install the O-ring (17) on the seat retainer (22).
b. Install the O-ring (24), seat (23), and seat retainer in the
manifold (25).
c. Install the body on the manifold and tighten the screws (26) securely.
The angled gun uses three screws, two short and one long.
5. Assemble the piston parts (6, 7, 8, 9) on the packing cartridge stem. Do
not tighten the lock nut (6).
6. Screw the piston assembly (5) onto the packing cartridge stem
clockwise until it comes to rest against the gun body.
S
If the gun is equipped with a ball and seat, turn the piston assembly
counterclockwise
S
If the gun is equipped with a tapered needle and seat, turn the piston
counterclockwise 1
7. Apply a drop of thread-locking compound to the lock nut threads. Hold
the packing cartridge stem with a small wrench while tightening the lock
nut.
8. High Pressure Guns: Install the compression spring (27) on top of the
piston.
9. Install the gasket (4) and air cylinder (3).
10. Re-install the gun on the mounting block (13) or mounting rod.
1 3
/ to / turn.
2 4
1
/ turns.
2
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