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Displacement Pump Repair
Intake valve repair
(See Fig. 16)
1. Remove the suction hose. See Step 3, Removing
the pump.
2. Unscrew the intake valve (118). 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
(119*). If no further service is needed, reassemble
the pump.
Disassembling the pump
1. Remove the intake valve (118).
2. Loosen the packing nut (102) and plug (123).
3. Use a plastic mallet to tap the piston rod (107)
down, and then pull the rod out through the bottom
of the cylinder.
4. Remove the packing nut (102) and throat pack-
ings.
5. Loosen the jam nut (117). 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
(110) 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 Fig.
18. The lips of the throat V-packings face down. The
lips of the piston V-packings face up. Incorrect installa-
tion damages the packings and causes pump leakage.
NOTE: Soak the leather packings in oil before reas-
sembling the pump.
1. Check the outside of the piston rod (107) and the
inside of the cylinder (115) for wear. Replace worn
parts to ensure a good seal with the new packings.
(See Fig. 18.)
2. Stack these parts onto the piston valve (108) one
at a time: the backup washer (126*) and u-cup
(125*), the female gland (114*), alternately three
plastic (112*) with two leather packings (113*), and
the male gland (111*). See Fig. 18.
1
Throat packings
2
Piston packings
Intake valve
3
123
102
*103
1
105*
*104
106*
Lips down
101
117
*116
115
Fig. 18
107
109*
110
111
*113
112*
Lips up
114*
125*
Lips down
126*
108
120
121
122*
119
118
03148A
2
3
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