36
DISPLACEMENT PUMP REPAIR
CYLINDER
PISTON
ASSEMBLY
SLEEVE
TAPERED END
Fig 36-1
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
36–1.
13. Screw down the cylinder locknut (31) 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. Torque to 67 ft–lb (90 N.m).
Refer to Fig 35–3.
15. Screw the displacement pump about 3/4 of the way
into the bearing housing (66). Hold the pin (63) up to
the pin hole in the connecting rod assembly (68) and
continue screwing in the pump until the pin slides eas-
ily into the hole. Back of f the pump until the top
threads of the pump cylinder are flush with the face of
the bearing housing and the outlet nipple (67)
is
straight back. Push the retaining spring (65) into the
groove all the way around the connecting rod. Tighten
the locknut (31) very tight–about
70 ft-lb (97 N.m)–with a 2 in. open–end wrench and
a light hammer.
Refer to Fig 36–2.
WARNING
Be sure the retaining spring (65) 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 36–2.
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 (31) loosens during operation, the
threads of the bearing housing (66) 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 36–2
68
63
65
66
31
TORQUE TO
70 ft–lb
(95 N.m)
FACE OF
BEARING
HOUSING
