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Displacement Pump Repair
WARNING
INJECTION HAZARD
To reduce the risk of serious injury,
whenever you are instructed to relieve
pressure, follow the Pressure Relief
Procedure on page 10.
NOTE: Packing Repair Kit 235–703 is available.
Reference numbers of parts included in the kit are
marked with an asterisk, i.e., (121*). For the best
results, use all the new parts in the kit, even if the old
ones still look good.
NOTE: To minimize down time, and for the best sprayer
performance, check the motor brushes (see page 20)
and clean the transducer (see page 28) whenever you
repack the pump. Replace these parts as needed.
Removing the pump
1. Flush the pump, if possible. Relieve pressure. Stop
the pump with the piston rod (107) in its lowest
position, if possible. To lower the piston rod manu-
ally, rotate the motor fan blades.
2. Remove the filter (85).
3. While pulling upward on the suction hose (32),
unscrew the hose from the inlet tube (38). Un-
screw the drain hose (33) from the displacement
pump nipple (36).
4. Use a screwdriver to push the retaining spring (18)
up and push out the pin (17).
5. Loosen the screws (21). Remove the pump (20).
Repairing the pump
See manual 308–190 for pump repair instructions.
Installing the pump
1. Mount the pump on the drive housing. Tap it into
the alignment pins with a soft hammer. Tighten the
screws (21) to 50 ft-lb (68 N.m).
WARNING
MOVING PARTS HAZARD
Be sure the retaining spring (18) is firmly
in the groove all the way around, to pre-
vent the pin (17) from working loose due
to vibration. See Fig. 17.
If the pin works loose, it or other parts could break
off due to the force of the pump action. These parts
could be projected into the air and result in serious
injury or property damage, including the pump
connecting rod or drive housing.
(See Fig. 16.)
(See Fig. 16 and 17.)
2. Align the hole in the rod (107) with the connecting
rod assembly (15). Use a screwdriver to push the
retaining spring (18) up and push in the pin (17).
Push the retaining spring (18) into place around
the connecting rod.
3. Replace the o-ring (27) if it is worn or damaged.
Reconnect the suction and drain hoses (32,33).
Install the front cover (13).
4. Tighten the packing nut (102) just enough to stop
leakage, but no tighter. Fill the packing nut/wet-cup
1/3 full with Graco TSL. Push the plug (123) into
the wet-cup.
13
85
20
21
33
32
27
38
Fig. 16
15
123
Torque to
50 ft–lb (68 N.m)
Fig. 17
18
17
120
107
*122
*121
36
*119
118
Torque to
50 ft–lb (68 N.m)
Apply anaerobic
polycrystal pipe
sealant
02832B
17
18
21
102
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