Graco ULTRA 500 Instructions-Parts List Manual page 30

Displacement Pump Repair
Lips of throat v–packings must face up
Lips of piston v–packings must face down
Lips of U–cup packing must face down
Leather
Poly
Torque to 64 N.m
224
205
216
*209
*207
*208
219
*202
*210
*206
*215
*214
*221
220
*202
Fig. 31
Installing the pump
Torque to 95 N.m
Face of bearing housing
6
Fig. 32
1. Screw the pump 3/4 of the way into the bearing
housing (6). Hold the pin (20) up to the pin hole in
213*
the connecting rod (9) and continue screwing in
the pump until the pin slides easily into the hole.
See Fig. 32.
225*
2. Align the top threads of the pump cylinder flush
with the face of the bearing housing and so the
218
outlet nipple (22) is straight back. See Fig. 32.
211
212*
Be sure the retaining spring (21) is firmly in the
groove of the connecting rod, all the way around, to
203*
prevent it from working loose due to vibration. Refer
to Fig. 32.
222
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.
204*
3. Push the retaining spring (21) into the groove of
223
the connecting rod, all the way around. Tighten the
locknut (56) very tight – 95 N.m, to prevent it loos-
ening and damaging the threads of the bearing
housing. See Fig. 32.
0085
4. Assemble the remaining parts.
9
20
56
WARNING
21
22
01579