Service
12
308371R
Air Motor Repair
If the vanes need replacing, or if foreign material is
present in the motor chamber, an experienced
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.
New vanes should have the edges with cut corners (or
the notched edges, if the vanes are reversible) pointing
toward the bottom of the vane slot.
Clean the Shaft
Every week, clean any dried fluid from around the
bearing (38) area of the shaft (14).
Replace the Heavy-Duty Air
Motor
Remove the Heavy-Duty Air Motor
1.
Disconnect the air hose (21).
2.
Loosen the two setscrews (32) on the collar (2) and
remove the air motor (1).
Install the Heavy-Duty Air Motor
1.
Place one-half of the coupling (3a) on the air motor
shaft (S), flush with the end of the shaft. Tighten the
coupling setscrew against the flat on the shaft.
2.
Install the load cushion (P) on the gear reducer
coupling half. Slide the clamp (2) onto the collar (4).
3.
Align the two coupling halves (3a), and push the air
motor hub into the collar (4) until it bottoms out, then
back it out 0.015 in. (0.38 mm). Make sure the air
motor inlet and outlet face up.
4.
Apply Loctite
™
Number 222 to the two clamp
setscrews (32). Align the setscrews to one side of
the slots on the collar (4), and tighten them.
5.
Apply pipe thread sealant to the inlet (20) and outlet
(22) fittings, and install them in the air motor.
Replace the Heavy-Duty Gear
Reducer
Do not attempt to repair the gear reducer (5) yourself.
Contact your Graco distributor.
Refer to F
1.
When replacing the gear reducer, turn it upside
down and remove the cap screws (33) and washers
(40) from the bottom of the old gear reducer.
2.
Remove the top coupling half (19a) from the old
gear reducer, and install the coupling half on the
new gear reducer. Wipe the screw holes clean with
a rag.
3.
Apply Loctite Number 271, or equivalent, to the four
cap screws (33).
4.
Install the cap screws (33) with the washers (40)
through the bracket (6) and into the gear reducer.
Make sure the three hole pattern on the bottom of
the bracket (6) is orientated in relation to the gear
reducer (5) as shown in F
5.
Run the agitator to let the bracket (6) center itself.
Torque the screws to 160 in-lb (18 N•m).
6.
Leave the gear reducer upside down for 30 minutes
to allow the Loctite to cure.
F
IG
. 5
P
4
32
2
S
22
20
1
3a
Apply Loctite Number 222.
1
Apply low-strength thread sealant.
2
2
1
2
L
T
21
2266B
