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Maintenance and Repair
Displacement Pump Service
Pump Disassembly
Reference numbers used in the following instructions
refer to F
. 5 on page 13.
IG
1. Turn off air supply
2. Relieve pressure, page 7.
3. Disconnect all hoses, tubes, controls, etc. from the
pump to provide ease in servicing.
4. Loosen, but do not remove, the intake valve housing
(62) while the displacement pump is still assembled
to the air motor base (46).
5. Remove the outlet adapter (56). Inspect the o-ring
(720 and replace if necessary.
6. Remove the cylinder coupling nut (57).
7. Insert a 3/4 npt pipe nipple or extension into the out-
let of the cylinder (55). Use this as a handle to turn
and remove the cylinder.
8. Remove the intake housing (62) from the cylinder
(55). Inspect the ball stop pin (58), guide (59), ball
(60), and o-ring (61) for wear or damage, and
replace as necessary.
9. Unscrew the piston and valve seat housing (54)
from the trip rod and piston assembly (43). Remove
the ball (48) from its seat and then remove the
washer (49), spring (50), male gland (51), v-pack-
ings (111, 112), and female gland (53). Inspect the
parts for wear or damage and replace as necessary.
10. Remove the packing housing (47) from the air motor
base (46). Take out the parts and clean all except
the seals with a compatible solvent. Clean the seals
with a soft cloth. Check the packing housing for
wear or damage and replace if necessary.
NOTE: As a preventive maintenance procedure,
replace all the seals every five years or sooner if
necessary.
11. Inspect the piston shaft (45) for scoring or wear. The
piston shaft is a part of the trip rod and piston
assembly (43) which must be replaced as one
12
piece. Do NOT break loose the epoxy fitting.
NOTE: Replacing this assembly requires disassem-
bly of the air motor, as described in the previous
section.
Scoring or irregular surfaces on the piston shaft or
polished inner wall of the cylinder (55) causes pre-
mature packing wear and leaking. Check these
parts by rubbing a finger over the surface or holding
the part up to the light at an angle. Replace worn or
damaged parts as needed.
Pump Assembly
Reference numbers used in the following instructions
refer to F
. 5 on page 13.
IG
1. Carefully slide the packing housing (47) onto the
piston shaft (45).
2. Insert the packing housing (47) into the air motor
base (46) by tapping lightly on the housing.
3. Insert the packings into the packing housing (47)
from the bottom and push them up toward the air
motor. Be sure the lips of the v-packings are facing
DOWN against the fluid pressure. The packings
should be inserted in the following order:
•
female gland
•
white v-packing
•
black v-packing
•
white v-packing
•
black v-packing
•
male gland
•
compression spring
•
washer
•
retaining ring
4. Place the piston packing onto the piston and valve
seat housing (54) in the following order with the lips
of the v-packing facing UP against fluid pressure:
•
female gland (53)
•
white v-packing (112)
•
black v-packing (111)
•
white v-packing (112)
•
black v-packing (111)
•
male gland (51)
•
spring (50)
•
washer (49)
®
5. Apply Loctite
27 sealant or equivalent to the hous-
ing (54) threads.
307714E
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