© 2024 Nordson Corporation
1044131-06
6-9
25B Air Valve and Air Motor Repair
Piston Assembly
See Figure 6-6.
1. Install the upper jam nut (15) onto the telescoping screw (17), with the recess for the
special nut facing away from the slotted head of the telescoping screw. Thread the
special nut (14) all the way onto the telescoping screw.
2. Install the O-ring (4) onto the spool rod (5). Thread the telescoping screw into the
spool rod.
3. Place the upper jam nut into a vise with the slotted head of the telescoping screw up.
Install the piston (18) onto the upper jam nut.
4. If removed, thread the lower jam nut (19) onto the connecting rod (22).
5. Thread the connecting rod into the upper jam nut until it bottoms out. Screw the lower
jam nut down until it contacts the piston and tighten it securely.
6. Install a new O-ring (23) onto the end of the connecting rod.
Air Motor Assembly
NOTE: Lubricate all O-rings and seals with O-ring grease before installation. O-rings
and U-cup are included in the air motor seal kit. The packing gland (24) must be ordered
separately.
See Figure 6-5 on page 6-7. Assemble the air motor in the following order:
1. New packing gland (24) into the upper base (26). Tighten securely.
2. New square O-ring (20) into the upper base groove.
3. Tie rod(s) (16) into the upper base. Tighten securely.
4. Piston assembly into the cylinder (21), then both on the upper base:
a. Lubricate the piston seal and inner cylinder wall. Insert the piston assembly into
the cylinder at an angle until the piston seal is completely inside the cylinder, then
straighten the piston assembly so it is parallel to the cylinder walls.
b. Lubricate the connecting rod. Hold the cylinder and the piston assembly and insert
the connecting rod through the packing gland. Insert the lip of the cylinder into the
O-ring groove in the upper base.
5. New O-rings (12) onto the connecting tube (13), then connecting tube into upper
base.
6. New square O-ring (20) in the the air motor head (10) groove.
7. Air motor head on cylinder, making sure the:
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8. U-cup (7) and spool carrier guide (6) in upper cylinder head.
NOTE: Install the U-cup with the lip facing down. Seat the U-cup in the bore before
installing the spool guide.
9. O-ring (4), spool (3), lockwasher (2), and screw (1) on spool rod.
10. Lock washers (9) and nuts (8) on tie rods.
NOTE: Tighten the nuts in a criss-cross pattern, evenly and securely.
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