Air Motor And Throat Service - Graco Fire-Ball H Series Instructions-Parts List Manual

Air Motor and Throat Service

Before you start:
1. Be sure you have all necessary parts on hand. Re-
pair Kit 206–728 is available for the motor and
throat. Use all the parts in the kit for the best re-
sults. Parts included in the kit are marked with one
asterisk, for example, (10*), in the text and draw-
ings.
2. Two accessory tools should be ordered. Use
Padded Pliers, 207–579, to grip the trip rod with-
out damaging its surface. Use Gauge, 171–818, to
ensure the proper clearance between the poppets
and seat of the transfer valve.
Disassembly
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
1. Flush the pump.
2. Relieve the pressure before proceeding.
3. Disconnect the hoses, remove the pump from its
mounting, and clamp the air motor base (35) in a
vise.
4. Use a pipe wrench on the knurled part of the cylin-
der (61) to screw it out of the base (35). See Fig.
5.
5. Pull the connecting rod (62) down as far as it will
go.
6. Use a hammer and punch to remove the roll pin
(42) from the piston rod (18), and then screw the
connecting rod (62) out of the piston rod.
CAUTION
Do not damage the plated surface of the trip rod.
Damaging the surface of the trip rod can result in
erratic air motor operation. Use the special padded
pliers, 207–579, to grasp the rod.
7. Manually push on the piston rod (18) to move the
piston (39) up as far as it will go. Unscrew the cyl-
inder cap nut (24). Pull the nut up. Grip the trip rod
(34) with padded pliers and screw the nut off the
rod. See Fig. 5.
8. Remove the six screws (3) holding the cylinder
(12) to the base. Carefully pull the cylinder straight
up off the piston (39).
CAUTION
To avoid damaging the cylinder wall, lift the cylinder
straight up off of the piston. Never tilt the cylinder
as it is being removed.