Repair
3A8564C
15
11. Place flats of the upper displacement rod (118) in a
bench vice. Unscrew the lower shaft assembly
(125) from the outlet check valve seat (124).
Unscrew the outlet check valve seat from the upper
displacement rod. Remove the piston guide and
seal assembly (121, 122, 123, and 124) and the
pump rod spacer (119).
12. Inspect the outer surfaces of the upper
displacement rod (118) and the lower shaft
assembly (125) for wear, scoring or any other
damage by holding them up to the light at an angle
or running a finger across the surface. See F
. 12.
13. Place the flats of the poppet outlet check valve
(123) and the piston guide (121) in a bench vice.
Slide a 0.5 In. (12.7 mm) brass rod through the
openings of the piston guide and unscrew it from
the poppet outlet check valve. Remove the piston
seal (122) and the piston guide bearing (120).
NOTE:
Piston guide bearing (120) is press fit into the
piston guide (121), and may require cutting to ease
removal. See F
14. To disassemble the intake check valve assembly,
remove the internal retaining ring (126) from the
poppet inlet check valve (128). Using a small
screwdriver or O-ring pick remove the lower shaft
seals (127). Inspect the poppet inlet check valve for
wear or damage. See F
F
IG
. 12
120, 121, 122, 123
125
118
119
124
F
IG
. 13
F
IG
. 14
120
121
122
123
126
127
128
