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1044131-06
7-7
25B Air Motor and Air Valve 25B 4:1 Hydraulic Section Repair
Assembly
NOTE: Lubricate all O-rings and lower packing U-cups with O-ring lubricant before
installing them. Tighten all threaded parts securely.
See Figure 7-3 on page 7-5.
1.
plunger (3).
2. Assemble the lower packings on the plunger in the following order:
a. Upper back-up washer (4) (smaller than lower backup washer).
b. Energizing washer (5) with turned edge facing down.
c. U-cup (6) with lip facing down.
d. lower backup washer (7).
3. Install a new O-ring (9) on the pressure seat (10).
4.
See Figure 7-5 on page 7-8 .
5. Install the new packing gland (2) in the solvent chamber (1).
6.
surface. Lubricate the plunger shaft (3) with O-ring lubricant, then drive it through the
packing gland with a rubber mallet, until the plunger touches the work surface.
7. Install new O-rings (11) on the pressure housing (12).
8.
(6). Use a rubber mallet to drive the pressure housing over the packing assembly and
the solvent chamber.
9. Thread the tie rods (17) into the solvent chamber.
10. Place the ball (15) into the siphon housing (16).
11. Install the cage pin (13) in the cage (14), then install the cage into the siphon housing.
12. Turn the pump assembly over and install the siphon housing over the pressure
housing and tie rod ends.
13. Install the lockwashers (18) and hex nuts (19) on the tie rods. Alternately tighten the
nuts to maintain alignment and prevent binding.
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