Aimco Brakes Nutrunner URW Series Repair Manual

- 9   -Disassembly and Reassembly of the Air Motor  
Disassembly  
1. For the  URW - 6 :
a. Remove the Gear Casing from the Handle Casing.
b. Remove the Air Motor from the Handle Casing.    Note :    Applying heat to the  Handle may help in
remov ing the Air Motor.
c. Tap on the splined end of the Rotor with a brass  hammer while holding the Air Motor firmly in your
hand.   Remove the Front Plate, Bearing ,   and Cylinder.
d. Press the Rotor out of the Rear Plate and Bearing.
2. For the  URW - 8N & 9N :...

- 10   -Disassembly and Reassembly of the Air Motor  (cont.)
4. Air Motor Plates :    Inspect Plates for grooving.  Light marks can be lapped out using a figure - eight motion
with 220 grit sandpaper on a Lap Plate.  If heavy grooving is noted, replace.
5. Rotor :    Inspect Rotor  for sharp edges in Blade Slots and  pitting and grooving on   Plate  Surface.  Light
marks can be stoned with a mediu m oil stone.  If deep markings exist,  replace.
6. O - Ring :    Inspect the O - rings for splitting or...

- 11   -Disassembly and Reassembly of the Air Mo tor  (cont.)
d. Install the Front Plate onto the Rotor aligning the   Roll Pin in the Cylinder and  press the Front Bearing
over the Rotor and int o the Front Plate.   Note :    The  Cylinder should be tight between the Front and
R ear Plate and the Rotor should  tu rn freely
e. Install the O - ring, Rear Plate Spacer ,   and Snap Ring into the Rear Plate.
f. Install the Air Motor into the Handle lining up the   hole in the Handle with the  alignment Pin...

- 12   -Disassembly and Reassembly of the Air Motor  (cont.)  
URW  -   Air Motor  
Part 
Number   Description   Part 
Number   Description  
1  
2  
3  
4  
5  
6   Bearing  
Front Plate  
Cylinder  
Roll Pin  
Rear Plate  
Bearing   7  
8  
9  
10  
11   Rear Pla te Spacer (URW - 8 & 9)  
Blade  
Rotor  
O - Ring (URW - 8 & 9)  
Snap Ring (URW - 8 & 9)   

- 13   -Recommended Maintenance  
The tools should be thoroughly cleaned and inspected every three months.    Always use genuine  Uryu   parts.  
Lubrication  
Use a light spindle oil for the air   motor like Mobile Spindle Oil No. 1, Shell Spindle Oil 60 ,   and/or equivalent.  
Use a high - quality  g rease for the Gearing, Cam ,   and Racheting sections like S hell Alvania No. 2, Mobilplex 2, 
and/or equivalent.   

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LIT - MAN480  
Rev. 
03/2016  Printed in USA  
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