Graco Fire-Ball 992-706 A, Instructions-Parts List Manual

Page: 14 / 24

14 307-759
Service
Displacement Pump
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
1. Flush the pump, and
Relieve the pressure
2. Disconnect all air and fluid hoses.
3. Remove the pump from its mounting and clamp
the air motor base in a vise.
4. Screw the intake valve housing (158) off riser tube
(160 or 163). See Fig. 4. Remove gaskets (148),
ball stop (157), and ball (145). Clean and inspect
for wear or damage. Replace as necessary.
5. Use a pipe wrench at the knurled part of the riser
tube (160 or 163) to screw it out of the air motor
base (104). Inspect the inside surface of the rise
tube for score marks or wear which could damage
the packing or cause low output on the upstroke.
Check by rubbing a finger on the surface, or by
holding it up to the light at a slight angle.
6. Unscrew the piston body (150) from the piston
coupling (151). Remove the ball (143), seat (156),
gasket (147), bearing (155),
packing (154),
and seal (153). Do not remove the press-fit brass
bearing (152).
NOTE: If the press-fit brass bearing (152) dows need
replacing, clamp it in a vise and drive the piston body
(150) out with a plastic Hammer. The new bearing
must be started onto the piston body squarely.
7. Clean all the parts in a compatible solvent and
inspect for wear or damage. Replace as neces-
sary. Lubricate parts with light waterproof grease.
8. Reinstall the seal (153*), packing (154*),
bearing (155*), gasket (147*) seat (156*), and
ball (143) on the piston body (150). The check ball
seat (156*) may be reversed if desired to provide a
new seat. Screw the piston body (150) into the
piston coupling (151).
9. Screw the riser tube (160 or 163) into motor base
(104).
10. Reinstall the ball (145), gasket (148), ball
stop (157), and other gasket (148) in the intake
valve housing (158). Screw the intake valve hous-
ing onto the riser tube (160 or 163)
11. If the grounding wire was disconnected before
service was begun, be sure to reconnect it before
operating the pump.
Fig. 4
06436
151
146
143
156
147
155
154
153
152
150
158
145
148
157
148
138
137
139
129
130
132
1
1
Lips of packings must face down.
PTFE