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10 307013
Service
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 7.
Disconnecting the Displacement Pump
1. Flush the pump, if possible. Stop the pump at the
bottom of its stroke. Relieve the pressure.
2. Disconnect the air and fluid hoses. Remove the
pump from its mounting. Note the relative position
of the pump’s fluid outlet (A) to the air motor’s air
inlet (B). See Fig. 2.
3. Screw the coupling nut (32) off of the air motor
piston rod. Be careful not to lose the two couplers
(33) as you lower the nut. Unscrew the tie rod
locknuts (26) from the tie rods (31). Carefully pull
the displacement pump (2) away from the air
motor (1).
4. Refer to the instruction manual 307728 (supplied)
for displacement pump service instructions.
5. Refer to instruction manual 306968 (supplied) for
air motor service instructions.
Reconnecting the Displacement Pump
1. Orient the pump’s fluid outlet (A) to the air motor’s
air inlet (B) as was noted in step 2 under Discon-
necting the Displacement Pump. Position the
displacement pump (2) on the tie rods (31).
2. Place the coupling nut (32) on the connecting rod
(T). Insert the couplers (33) into the coupling nut
from the top. Screw the coupling nut (32) onto the
air motor piston rod. Screw the locknuts (26) onto
the tie rods (31) loosely.
3. Mount the pump and reconnect all hoses. Recon-
nect the ground wire if it was disconnected during
repair.
4. Tighten the tie rod locknuts (109) evenly, and
torque to 40–50 ft-lb (54–68 NSm).
5. Tighten the packing nut/wet-cup (S) with the
wrench (28) supplied, so it is just snug - no tighter.
Fill the wet-cup 1/2 full with Graco Throat Seal
Liquid (TSL) or compatible solvent. Start the pump
and run it slowly at about 20 psi (140 kPa, 1.4 bar)
air pressure, to check that it is operating properly.