Nordson 25B - 3. Air Valve Procedures

Repair
7-2
E1999 Nordson Corporation
All rights reserved
104 330H
Issued 8/99
Manual 1-8
The following procedures cover the new air valve configuration. The
improved design incorporates a new, larger center block and uses no
poppet spacers. Replacement poppet spacers are still available, but if
replacing the center block, you must order a conversion kit which
includes a new center block. Refer to the
Parts section for part numbers.
See Figure 7-1. Use the following procedure to disassemble the air
valve.
1.Loosen the screws (17) securing the air valve assembly to the air
motor head. Leave the screws in place so the whole assembly can
be removed from the pump in one piece.
2.Lift the entire assembly off the air motor head. Remove the
O-ring(27) and gaskets (25) from the bottom of the valve.
3.Remove the mufflers and adapter fittings from the air valve.
4.Remove the four screws (17) and lockwashers (16) from the air valve.
5.Remove the screw (1), lockwasher (2), flat washer (3), nut (4), and
spacer (5).
6.Remove the valve bracket (6), gasket (15), snapper assembly (20),
fork(18), ball stem (21), and spring (14).
7.Remove the four fillister head screws (12) and lockwashers (13) from
the end plates (11).
8.Remove the end plates (11). Remove the washers (24) from the
endplates.
9.Remove the socket head screw (9) from the crankshaft end
bushing(10) and the socket head screws (23) which secure the
poppets (22) to the poppet guide (28). Remove the poppets (22) from
the center block (29).
10.Slide one of the fillister head screws (12) through the crankshaft end
bushing (10) and thread into the end of the crankshaft (19). Use the
fillister head screw to push the crankshaft out of the center block (29).
Remove the fillister head screw and pull the end bushing (10) out of
the center block (29).
11.Remove the O-rings (8) from the crankshaft and end bushing.
12.Lift the arm (7) from the center block (29).
13.Slide the poppet guide (28) from the center block (29).
14.Remove the O-rings (26) from the center block (29).
3. Air Valve
Air Valve Disassembly