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22 308351
Displacement Pump Service
9. Remove the seal (8) from the bottom of the cylin-
der (10). See Fig. 12. Shine a light into the cylinder
to examine the inside surface for scoring or dam-
age. Only if the cylinder is damaged, or there is
evidence of leaking around the top cylinder
seal (8), unscrew the cylinder from the outlet
housing, using a pipe wrench. Remove the top
cylinder seal.
10. Place the flats of the displacement rod (1) in a
vise. Unscrew the piston (12) from the displace-
ment rod; the priming piston rod (18) will come
with it. Slide the piston guide (11) and seat (14) off
the piston (12).
11. It is not necessary to remove the priming piston
rod (18) from the piston (12) unless your inspec-
tion reveals damage to either part. To disas-
semble, place the piston flats in a vise and un-
screw the rod.
12. Place the piston guide (11) in a vise, as shown in
Fig. 11. Using an adjustable wrench, unscrew the
piston seat (14) from the guide. Remove the seal
(13); always replace it with a new one. Inspect the
mating surfaces (M) of the piston (12) and piston
seat (14) for damage or wear. See Fig. 12.
13. To disassemble the intake check valve assembly
(V), place the intake valve body (16) in a vise and
unscrew the packing nut (15). Remove the seal
(39) from the nut, and the glands and packings (P)
from the valve body. Inspect the mating surfaces
(N) of the intake valve body (16) and seat (37) for
damage or wear. See Figs. 7 and 13.
NOTE: The seal (39) is press-fit in the nut (15) and
may require cutting to ease removal.
14. Unscrew the bleeder valve plug (20) completely
from the valve body (29). Clean the valve threads
and the bleed hole. It is not necessary to remove
the valve body from the pump outlet housing (9).
15. Inspect all parts for damage. Clean all parts and
threads with a compatible solvent. Reassemble as
explained on page 23.
03832
Fig. 11
1
When reassembling items 11 and 14,
apply thread sealant and torque to
approx. 77–85 N.m (57–63 ft-lb).
14
11
Fig. 12
1
11
12
*8
18
10
13*
14
17a, b, c
M
1
Torque to 125–139 N.m (92–102 ft-lb).
1
2
Torque to 324–368 N.m (239–271 ft-lb).
2
3
Lubricate.
3
DETAIL OF PISTON CHECK VALVE
3
05002