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Displacem nt Pump Repair
NOTE: Packing Repair Kit 235-703 is available. Ref-
erence numbers of parts included in the kit are
sults, use all the new parts in the kit, even if the old
marked with an asterisk, Le., (121*). Forthe best re-
ones still look good.
NOTE: To minimize down time, and for the best sprayer
and clean the transducer (see page 30) whenever you
performance, the motor brushes (see page
21)
repack the pump. Replace these parts as needed.
Intake valve repair
(See Fig. 18)
1.
Remove the suction hose. See Step
2,
Removing
the pump.
2 . Unscrew the intake valve ( 1 1 8 ) . Remove the
O-ring (119*), ball guide (120), stop pin (122*)
and ball (121*) from the valve.,.
.
..
3. Clean and inspect the parts for wear or damage.
Replace parts as needed. Use a new O-ring
(1 19*).
If no further service is needed, reassemble
the pump.
Disassembling the pump
(See Fig. 1 9 . )
1.
Remove the intake valve
(1 1 8 ) .
See page
2 . Loosen the packing
nut
(102) and
plug
(123).
3. Use a plastic mallet to tap the piston rod (107)
tom of the cylinder.
down, and then pull the rod out through the bot-
4.
Remove the packing nut (102) and throat pack-
ings.
5 . Loosen the jam nut ( 1 1 7 ) . Remove the cylinder
(115) and the O-ring (116*).
6. Clamp the flats of the piston rod in a smooth jaw
vise. Use an open-end wrench to loosen the nut
(1 10)
and then unscrew the piston valve
(108).
7. Remove all parts from the piston valve (108).
Reassembling the pump
NOTE Alternate plastic and leather packings. See
The lips of the piston V-packings face up. Incorrect
Fig. 19. The lips of the throat V-packings face down.
leaking.
installation damages the packings and causes pump
sembling the pump,
NOTE: Soak the leather packings in oil before reas-
1. Check the outside of the piston rod (107) and the
inside of the cylinder
(1 15)
for wear. Replace worn
parts to ensure a good seal with the new pack-
ings.
2 . Stack these parts onto the piston valve (108) one
at a time: the backup washer (126*) and u-cup
plastic (112*) with Wo leather packings
(1 13*),
(125*), the female gland (114*), alternately three
and the male gland (11 l * ) . See Fig. 19.
A
Throat packings
A
Piston packings
A
Intake valve
Fig.
19
01069A
308-216
23
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