Graco F Series Instructions-Parts List Manual page 11

Pump Reassembly (See Fig. 3)
NOTE: If you are using three displacement pumps,
install the center one first.
1. Install the displacement rod and the piston assem-
bly in the cylinder. Leave the throat packing nut (E)
and the piston stud loose. Refer to displacement
pump manual 307944. For ease of assembly, pull
up on the rod until 4 in. (100 mm) is exposed.
CAUTION
Do not expose more than 4 in. (100 mm) of the
displacement rod. If the rod is pulled past this point,
the piston packings could be damaged by the
threads on the displacement pump outlet.
2. Slide the displacement rod through the tie plate
(18), the retaining ring (17), and the washer (15).
Thread the rod into the yoke (16) by turning the
pump cylinder. Use a wrench on the flats of the rod
for the final tightening.
3. Push the cylinder up unto the tie plate (18), and
thread the retaining ring (17) onto the cylinder.
4. Move the air motor to the bottom of the stroke, and
check the play of the air motor yoke (16) at each
displacement rod. Be sure the rods are centered,
and tighten the locknuts (14) securely.
5. After mounting the displacement pumps to the air
motor yoke, use a 3/8 in. hex key wrench to tight-
en the piston studs securely. Tighten the throat
packing nut (E) just enough to prevent leakage,
but no tighter.
6. Install the intake valve in the body of the cylinder,
and torque the valve to 30–35 ft-lb (41–46 NSm).
7. Install the outer displacement pumps, using the
same process as used for the center pump.
Service
14
16
15
17
E
20
Fig. 3
18
19
06917
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