Graco Fire-Ball H Series Instructions-Parts List Manual page 15

Air Motor and Throat Service
Reassembly
1. Clean all the parts carefully in a compatible solvent
and inspect for wear or damage. Use all the repair
kit parts during reassembly and replace other parts
as necessary.
2. Check the polished surfaces of the piston (39),
piston rod (18), and cylinder wall (12) for scratches
or wear. A scored rod will cause premature pack-
ing wear and leaking.
3. Lubricate all parts with a light, waterproof grease.
4. One at a time, install the male gland (27 ), five
v-packings (25 ), bearing (28 ), backup washer
(20), and flat packing (21 ), with the lips of the v-
packings facing down. Screw the packing nut (19)
into the base (35) loosely. See the Detail in Fig. 5.
5. Slide the piston rod (18) down through the pack-
ings and lower the piston (39) into the base (35).
Be sure the o-rings (14*, 16, 17*) are in place.
See Fig. 5.
L
9 26 15
M
29
31*
Turn wires up.
Push toggles (L) in and then up.
Cut off tops of poppets as indicated by dotted lines.
Fig. 6
34 7
13*
11*
22*
10*
11*
30*
39
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6. Pull the exhaust valve poppets (31*) into the valve
actuator (33) and clip off the top part shown with dot-
ted lines. See Fig. 6.
7. Install the transfer valve grommets (10*), then reas-
semble the valve mechanism. Before installing the
lockwires (13*) in the adjusting nuts (11*), use the
special gauge, 171–818, to adjust the transfer valve
so there is 0.145 in. (3.7 mm) clearance between the
poppets (30*) and the seat when it is open. See Fig.
6. Snap the toggles (15) to the up position.
8. Reassemble the air motor and assemble to the dis-
placement pump. Before installing the air motor
plate, tighten the throat packing nut (19) just snug ––
don't overtighten.
9. Before remounting the pump, connect an air hose
and run the pump slowly [at about 40 psi (3 bar)] to
see that it operates smoothly.
10. Reconnect the ground wire before regular operation
of the pump.
34
29
33
Cutaway View
22*
31*
11*
10*
11*
14*
0.145"
(3.7 mm)
30*
39
04119