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Displacement Pump Service
Disassembly
When disassembling the pump, lay out all the removed
parts in sequence, to ease reassembly. Clean all parts
with a compatible solvent and inspect them for wear or
damage. Refer to Fig. 8 for a cutaway view of the
pump.
NOTE: Repair Kit 222869 is available. See page 27.
For the best results, use all the new parts in the kit. Kit
parts are marked with an asterisk, for example (4*).
1. Remove the displacement pump from the air motor
as explained on page 14. Place the pump in a
vise, with the outlet housing (9) positioned as
shown in Fig. 7.
2. Hold the flats of the priming piston rod (18) with an
adjustable wrench, and use a second wrench to
unscrew the priming piston seat (22) from the rod.
Slide the priming piston (21) off the rod. Inspect
the inner and outer surfaces of the piston (21) for
scoring, wear, or other damage.
3. Loosen the packing nut (2) using the wrench (109)
supplied.
4. Using a pipe wrench on the hex of the intake
cylinder (19), unscrew it from the intake valve
housing (17). The pump may separate at joints A,
B, or C. See Fig. 7.
22
21
Fig. 7
16
308355
18
NOTE: These instructions are written with the pump
separating at joint A. If it separates at joints B or C,
disassemble it at that joint, place the intake housing
(17) in a vise, and continue with step 5.
5. Unscrew the intake valve housing (17) from the
cylinder (10) and outlet housing (9). Pull the hous-
ing off the pump. The intake check valve assembly
(V, see Fig. 6) should slide down the priming piston
rod (18) as you remove the housing; if it does not
slide easily, firmly tap on the top of the housing
(17) with a rubber mallet to loosen.
DETAIL OF INTAKE CHECK VALVE
17
N
37
38
18
Fig. 6
19
A
17
B
10
C
9
2
1
39
15
V
24
16
05009
04993
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