Displacement Pump
WARNING
To reduce the risk of serious bodily injury, always fol-
low the
Pressure Relief Procedure W arning
on
page 4 before repairing the sprayer.
Removing the Pump
See Fig. 21.
1. Flush the pump. Relieve pressure.
2. Hold the intake valve (223) with a wrench and un-
screw the suction tube swivel union (53). Unscrew
the hose (133).
3. Push the retaining spring (75) up. Push the pin (71)
out the rear.
4. Loosen the locknut (137). Unscrew the pump.
76
75
71
137
133
223
204*
219
220
221*
202*
53
Fig. 21
Disassembling the Pump
1. Unscrew the intake valve (223) and remove all parts.
See Fig. 21.
2. Remove the plug (205). Unscrew the packing nut
(216). See Fig. 22.
*213
*209
216
205
*208
222
211
219
224
207*
Fig. 22
3. Tap the piston rod (224) down and then pull it out the
bottom of the cylinder (219). See Fig. 22.
4. Remove the glands (209*, 208*) and v–packings
(207*, 213*) from the throat. See Fig. 22.
5. Clamp the flats of the piston rod (224) in a vise. Loos-
en the piston (222). Unscrew the nut (211) from the
piston. Remove the glands (210*, 214*) and pack-
ings (212*, 206*, 203*) from the piston. See Fig. 23.
219
212*
213*
*210
205
*206
203*
*202
*208
*207
*209
218
216
*215
*214
224
137
*217
223
222
Fig. 23
1
3
4
2
Leather
Lips must face down
1
3
Poly
Lips must face up
2
3
1
4
2
4
3
5
Torque to
67 ft–lb
(90 N.m)
5