Disassembly And Reassembly Of The Air Motor - Aimco UAT Series Repair Manual

Disassembly and Reassembly of the Air Motor

Disassembly:
1. Remove the Casing (left-hand thread), Pulse Unit, Spacer, Spring, and Operating Rod from the Handle.
2. With the Casing Connector Fixture, remove the Casing Connector (left-hand thread) from the Handle.
3. Remove the Front Air Motor Plate, Rotor, Cylinder, Blades, Rear Air Motor Plate, O-ring, and Rear Plate
Spacer from the Handle.
4. Remove the O-rings from inside of the Handle.
5. Remove the Bearings from the Front and Rear Air Motor Plates. The Bearing is a press fit into and over the
Rotor on the Rear Air Motor Plate.
6. Clean and inspect all parts. Resurface only those parts having burs on them. If any parts show deep grooving
or surface wear, they will need to be replaced.
Assembly:
1. You will find all Bearings, O-rings, Blades, and Filter needed for rebuild of the Air Motor in an Air Motor
Repair Kit (RK). To order an RK, you would order the model number of tool plus dash RK (i.e., UAT-70RK).
2. Coat one-third of the Bearings with a good quality grease (i.e., Chevron Moly Grease EP NLG1 2).
3. Press the Rear Plate Bearing into the Rear Plate and over the Rotor at the same time.
Note: You should not be able to see any light between the Rear Plate and the Rotor and the Rotor should
turn freely when you have it set right.
4. Put a light coat of air motor oil on the Blades and install them in the Rotor.
5. Put the Cylinder down over the Rotor and onto the Rear Plate with exhaust holes up.
6. Press the Front Plate Bearing into the Front Plate and install the Front Plate onto the Cylinder and Rotor.
7. Install the O-ring and Rear Plate Spacer onto the Rear Air Motor Plate.
8. Lightly oil the O-rings and install them into the Handle.
9. Line up the pin on the side of the Front Plate with the cut-out on the inside of the Handle and install the Air
Motor into the Handle.
10. Install the Casing Connector into the Handle. The recommended torque for the UAT-30 - 80 is 45 Nm +/-5,
for the UAT-90 is 50 Nm +/-5, and for the UAT-100 and UAT-130 it is Nm 60 +/-5. Make sure to use a
good service removable thread locker on the Casing Connector.
11. Install the Operating Rod, Spring, Adjusting Spacer, Pulse Unit, and Casing on the Handle. Make sure to use
a good service removable thread locker on the Casing Connector. Note: The torque for the Front Casing is
16-24 Nm for the UAT-30D ~ UAT-80, 25-38 Nm for the UAT-90 ~ UAT-130, and 13-19 Nm for the bolts
on the UAT-200. Apply Loctite 243 to threads on the Casing Connector.
12. The tool is ready to test.
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