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308655J 13
Displacement Pump Service
Disassembly
NOTE: Be sure you have all necessary parts on hand.
Repair Kit 238751 includes repair parts for the
air motor and pump. Use all parts in the kit for
the best results. Parts included in the kit are
marked with one asterisk, for example (19*), in
the text and drawings. See the Parts List on
page 14.
1. Flush the pump.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 7.
2. Relieve the pressure.
3. Disconnect the hoses, remove the pump from its
mounting, and clamp the air motor base (28) in a
vise horizontally by closing the vise jaws on the
flange.
Intake Valve. See Fig 6.
1. Relieve the pressure.
2. Unscrew the valve housing (111). Remove the
o-ring (105*), retainer (112), and ball (104).
3. Inspect the parts for wear or damage. If the ball is
nicked, replace it. Put grease on the male
threads, and reassemble.
Displacement Pump. See Fig 6.
NOTE: Clean and inspect all parts for wear or damage
as you disassemble them. Replace parts as
needed. For best results, always replace all
the o-rings and packings when you disassem-
ble the pump.
1. Relieve the pressure.
2. Follow steps 1 to 7 of Disassembly on page 9.
3. Carefully inspect the smooth inner surface of the
fluid cylinder (110) for scoring or scratches. Such
damage causes premature seal wear and leaking.
Replace the cylinder as needed.
Reassembly
Do steps 16 through 26 in Air Motor and Throat
Service on page 12.
Fig. 6
104
111
105*
110
06039
112
* Included in Pump Repair Kit 238751, which may
be purchased separately. The Parts List on page
14 includes all parts in kit.