Repair
7-18
Part 237478_03
E 2012 Nordson Corporation
Replacing the Air Valve (contd)
17. Position the trigger handle on the gun mounting plate and install the
split‐lock washers and socket‐head screws.
18. Reconnect the air line by threading the inlet air line elbow connector
through the gun mounting plate, then inserting the high‐temperature air
line tubing into the red collar on the elbow connector.
19. Reconnect the outlet air line swivel fitting from the bulkhead fitting
(extrusion gun) or the T manifold (swirl gun).
20. Restore the system to normal operation by following the instructions in
the applicator product manual.
Replacing the Air Valve Spring
Use this procedure to replace the air valve spring inside the valve body. The
valve body is located inside the trigger handle shells.
1. Relieve hydraulic pressure (refer to the Relieving Hydraulic Pressure
procedure in Section3, Installation).
2. Move the applicator circuit breaker to the OFF position, then disconnect
and lock out input electrical power to the applicator (seeFigures7‐1
and7‐2).
3. Disconnect the gun‐to‐hose electrical connection.
CAUTION: Risk of burns. Wear protective gloves when performing this
procedure to reduce the risk of burns from hot melt or equipment.
4. Remove the trigger handle from the gun mounting plate as follows:
a. Remove the high‐temperature air line tubing by depressing the red
collar on the inlet air line elbow connector and pulling the tubing out.
b. Disconnect the inlet air line elbow connector.
c. Remove the two socket‐head screws and split‐lock washers that
secure the gun mounting plate to the trigger handle.