38
307–785
DISPLACEMENT PUMP REPAIR
CYLINDER
PISTON
ASSEMBLY
SLEEVE
TAPERED
END
Fig 38-1
12. Slide the sleeve/piston rod assembly INT O THE
BOTTOM OF THE CYLINDER . This is to prevent
packing damage during reassembly .
Refer to Fig
38–1.
13. Screw
down the cylinder locknut (47) until
it is finger
tight
at the bottom of the external cylinder threads.
14.
Place flats of the intake valve (223) in a vise. Install
a
new o-ring (202*). Screw the pump
cylinder into the
valve.
T
orque to 67 ft–lb (90 N.m).
Refer to Fig 37–3.
15. Screw
the displacement pump about 3/4 of the way
into
the bearing housing (69). Hold the pin (43) up to
the
pin hole in the connecting rod assembly (68) and
continue screwing in the pump until the pin slides
easily into the hole. Back off the pump until the top
threads of the pump cylinder are flush with the face
of the bearing housing and the outlet nipple (40) is
straight
back. Push the retaining spring (42) into the
groove
all the way around the connecting rod. T
ight-
en the locknut (47) very tight–about 70 ft-lb (97
N.m)–with
a 2 in. open–end wrench and a light ham
-
mer.
Refer to Fig 38–2.
WARNING
Be sure the retaining spring (42) is firmly in the
groove
of the connecting rod, all the way around, to
prevent
it from working loose due to vibration. Refer
to
Fig 38–2.
If the pin works loose, it or other parts could break
off due to the force of the pumping action. These
parts could be projected through the air and result
in
serious bodily injury or property damage, includ
-
ing
damage to the pump, connecting rod or bearing
housing.
If the locknut (47) loosens during operation, the
threads of the bearing housing (69) will be dam-
aged.
Be sure to tighten the locknut firmly
.
CAUTION
16. Tighten the packing nut (216) just enough to stop
leakage,
but no tighter
. Fill the wet–cup/packing
nut
1/3
full with Graco TSL.
Fig 38–2
68
43
42
69
47
TORQUE
T
O
70 ft–lb
(95 N.m)
F
ACE OF
BEARING
HOUSING
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