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17308842
Displacement Pump Repair
See manual 308798 for pump repair instructions.
Removing pump
1. Flush pump. Relieve pressure. Fig. 11. Cycle
pump with piston rod (222) in its lowest position.
2. Fig. 11. Remove suction tube and hose.
Fig. 11
7672B
222
3. Fig. 12. Use screwdriver: push retaining spring up
and push out pin.
Fig. 12
7675B
21
4. Fig. 13. Loosen locknut by hitting firmly with a
20 oz (maximum) hammer. Unscrew pump.
Fig. 13
7673B
Installing pump
WARNING
If pin works loose, parts could break off due to
force of pumping action. Parts could project
through the air and result in serious injury or prop-
erty damage.
CAUTION
If the pump locknut loosens during operation, the
threads of the bearing housing will be damaged.
1. Fig. 14. Pull piston rod out 1.5 in. Screw in pump
until holes in bearing cross link and piston rod
align.
Fig. 14
7676B
1.5 in.
2. Fig. 12. Push pin (21) into hole. And push retaining
spring into groove all the way around connecting
rod.
Fig. 15. Screw jam nut down onto pump until stops.
Screw pump up into bearing housing until it is stopped
by jam nut. Back off pump and jam nut to align pump
outlet to back. Tighten jam nut by hand, then tap 1/8 to
1/4 turn with a 20 oz (maximum) hammer to approxi-
mately 75" 5 ft–lb (102 Nm).
Fig. 15
7673B
Fig. 16. Fill packing nut with Graco TSL, through one
of the slits, until fluid flows onto the top of seal.
Fig. 16
7677B