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REMOVING AND INSTALLING THE DISPLACEMENT PUMP
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Removal
See
Fig
15-1.
I.
Flush the pump, if possible, and relieve pressure
again. Stop the pump with the piston rod in its lowest
position, if possible.
2.
Remove the suction tube (42); hold the wrench on
the pump intake valve (223) to keep the pump from
loosening.
3. Remove the
hose (47).
4. Push the retaining spring
(35)
up and push out the pin
(20).
5.
Loosen the locknut (38) and unscrew the pump from
the bearing housing (27).
Installation
See
Fig
15-1 and
75-2.
1.
Screw the displacement pump into the bearing hous-
bly
(29)
and the displacement rod (224) align. Install
ing (27) until the pin hole in the connecting rod assem-
the pin
(20).
2 .
Continue to screw the pump into the
bearing housing
with the face of the bearing housing and the outlet nip-
until Ihe top threads of the pump cylinder are flush
ple
(75)
is straight back. Push the retaining spring
(35)
Tighten the locknut (38) to
70
ff-lb
(97
N.m).
into the groove all theway around the connecting rod.
WARNING
groove of the connecting rod, all the way around, to
Be sure the retaining spring
(35)
is firmly
in the
prevent it from working loose due to vibration.
off due
to the force of the pumping action. These
If the pin works loose, it or other parts could break
parts could be projected through the air and result
in
serious bodily injury or property damage, including
damage to the pump, connecting rod or bearing
housing.
r - c A U T ' o N " l
If
the locknut (38) loosens during operation, the
threads of the bearing housing (29)
will
be
dam-
aged. Be sure to tighten the locknut firmly.
w . . \
223
b
4
2
Fig 15-1
I 1
Fig 15-2
!
3.
Tighten the packing
nut/
wet-cup just enough to stop
leakage, but no tighter. Fill the wet-cup/packing nul
1/3
full with Graco TSL.
307-827
15
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