Displacement Pump Repair
REMOVING AND INSTALLING
PUMP
Remove the pump
(Flg.
31).
1.
Flush the pump. Relieve pressure. Stop the pump
with the piston rod
(224)
in its lowest position or
carefully rotate the blades of the fan wi@ a screw-
driver
to
lower the rod.
2.
While holding the pump intake valve
(223)
steady
with a wrench, unscrew the suction tube
(71).
3.
Disconnect the hose
(70).
4.
Push the retaining spring
(42)
up. Push out the
pin
(43).
5.
Loosen the locknut
(47)
and unscrew the pump
from the bearing housing
(69).
69
42
216
224
43
47
Flg.
31
IIU
mrw
Install
the pump
(Fig.
32).
1.
Screw the displacement pump
3/4
of the way into
the bearing housing
(69).
2.
Hold the pin
(43)
up
to
the pin hole in the con-
necting rod assembly
(68)
and continue screwing
in the pump until the pin slides easily into the
the pump cylinder are flush with the face of the
hole. Back
off
the pump until the top threads of
straight back.
bearing housing and the outlet nipple
(40)
is
3.
Push the retaining spring
(42)
into the groove all
the way around the connecting rod.
4.
Tighten the locknut
(47)
very tight-about
70
ft-lb
light hammer.
(97
N.m)-with a
2
in. open-end wrench and a
groove of the connecting rod, all the way around, to
Be sure the retaining spring
(42)
is
firmly in the
prevent it from working loose due to vibration. Refer
to Fig.
32.
If
the
pin works
loose,
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, sprayer damage or property damage.
I
A
CAUTION
I
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.
5.
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
(65).
I
Fig.
32
I
308-560
33
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