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Repair
313643G 7
Repair
Flush the Air Motor
If the motor is sluggish or inefficient, flush it with
non-flammable solvent in a well-ventilated area.
1. Follow the Pressure Relief Procedure. See
page 6.
2. Add several teaspoons of solvent, or spray the sol-
vent directly into the motor.
3. Rotate the shaft by hand in both directions for a few
minutes.
4. Reconnect the air line and slowly apply pressure
until there is no trace of solvent in the exhaust air.
5. Lubricate the motor with a squirt of lightweight oil in
the chamber.
Service
Air Motor
1. To remove the air motor for service, use a 3/16 hex
to remove the three setscrews (9) on the bung
adapter (4).
2. Lower the adapter (4) on the shaft (2) so coupler (3)
is accessible.
3. Use a 1/8 hex to remove the top two setscrews (8)
on the coupler (3).
4. Lift the air motor (1) straight up off the coupler (3).
• If the air motor (1) requires more than installation of
a service kit, it is usually quickest and easiest to
send it to the Graco distributor for repair or replace-
ment.
• If the air motor blades need replacing or foreign
material is present in the motor chamber, an experi-
enced mechanic may remove the end plate opposite
the drive shaft end. Do not pry with a screwdriver. It
will dent the surface of the plate and body, causing
leaks. Use a puller tool, which will remove the end
plate while maintaining the position of the shaft.
Shaft and Agitator Blades
1. Remove the shaft (2) from the drum. Clean with a
compatible solvent and inspect the shaft (2) and
blades (6, 7) for wear or damage.
2. If parts need replacing, follow steps 1-4 under Air
Motor to remove the air motor.
3. Use the 1/8 hex to remove the other two setscrews
(8) on the coupler.
4. Slide the shaft off (2).
5. If needed, use a 3 mm (1/8 in.) hex to remove the
setscrew (8) on the hub assembly (6 or 7). Slide the
hub/blade assembly off of the shaft.
6. To install a new hub/blade assembly, slide it onto the
shaft. The setscrew must always remain on the top,
with the blades hanging down, so the blades will
pass into and out of the bung hole.
NOTE: Air Motor Repair Kits are available. Order Part
207335 for Model 24C728 (low viscosity) or Part 224954
for Model 24C729 (high viscosity).
Reassembly
1. Slide the shaft (2) into the coupler (3). Use a 1/8 hex
to tighten the setscrews (8). Torque to 65 in-lb
(7.3 N•m).
2. Raise the bung adapter (4) on the shaft (2) to recon-
nect to the air motor. Use a 3/16 hex to tighten the
three setscrews (9) on the bung adapter. Torque to
80 in-lb (9 N•m).