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Repair
Ball and Seat Module Replacement
E 2017 Nordson Corporation
WARNING: Allow only qualified personnel to perform the following tasks.
Follow the safety instructions in this document and all other related
documentation.
WARNING: To prevent serious injury to personnel and damage to
equipment, relieve system fluid pressure and disconnect and lock out
system electrical power before repairing the spray gun.
CAUTION: If you disassemble the ball and seat module for inspection and
cleaning, mark the ball tip pin location so you can install the ball tip in the
same position it was in when it was removed. If you install it 180_ out of
position, the ball tip will no longer seal against the seat, allowing fluid to leak
from the nozzle.
See Figure 5. Use the ball and seat service kit to replace the ball and seat
module. You do not have to remove the gun from its mounting.
Removal
1. Relieve system fluid pressure. Disconnect and lock out system
electrical power.
2. Remove the nozzle nut (1) and the nozzle (2).
3. Remove the retaining nut (3).
4. Unscrew the ball and seat module (4) from the armature shaft.
Installation
1. Install a new O-ring (5) in the gun body or extension groove. The O-ring
is included in the ball and seat service kit.
2. Carefully thread the new ball and seat module (4) onto the
armature shaft (6) until it bottoms out on the armature shaft flange.
Tighten the module finger tight. Do not apply more than 0.56 N
(5 in.-lbs) of torque.
3. Rotate the seat housing (8) counterclockwise (
the first set of slots engage with the gun body pins (7). Do not loosen
the threaded connection to engage the slots with the body pins.
4. Place the retaining nut over your finger. Using this finger to hold the ball
and seat module tight against the gun body, screw the retaining nut onto
the gun body or extension. Tighten the retaining nut to 14−20 N
(10−15 ft-lbs).
5. Install the nozzle and nozzle nut. Tighten the nozzle nut to 34 N
(25 ft-lbs) maximum.
A20A Automatic Electric Airless Spray Gun
1
/
4
13
m
D
turn maximum) until
m
D
m
D
Part 108182-03
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