21309255
Displacement Pump Replacement
See manual 309250 or 309277 for pump repair instructions.
See parts manuals for sprayer part number references.
Removing pump
1. Flush pump. Relieve pressure. Fig. 16. Cycle
pump with piston rod (201) in its lowest position.
2. Fig. 16. Remove suction tube and hose.
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Fig. 16
201
3. Fig. 17. Use screwdriver: push retaining spring up
and push out pin.
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Fig. 17
114
4. Fig. 18. Loosen locknut by hitting firmly with a
plastic hammer. Unscrew pump.
Fig. 18
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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. Make sure pin is properly installed.
CAUTION
If the pump jam nut loosens during operation, the
threads of the bearing housing and drive train will be
damaged. Make sure jam nut is tightened to
75 +/–5 ft–lb (102 Nm).
1. Fig. 19. Pull piston rod out 1.5 in. Screw in pump
until holes in bearing cross link and piston rod
align.
Fig. 19
1.5 in.
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2. Fig. 17. Push pin (21) into hole. And push retaining
spring into groove all the way around connecting
rod.
Fig. 20. 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 plastic hammer to approximately
75 +/–5 ft–lb (102 Nm).
Fig. 20
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Fig. 21. Fill packing nut with Graco TSL, through one
of the slits, until fluid flows onto the top of seal.
Fig. 21
7677B
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