Aimco Brakes Nutrunner UAN Series Repair Manual

- 8   -Disassembly and Reassembly of the Angle  Head Section
Disassembly  
1. On the UAN - 611R and 701R, loosen the locking nut (right hand) and remove the angle head casing on the
UAN - 830 and 950.  Remove the angle head casing (left hand).
2. Remove the angle head casing cover on the UAN - 611R and 701R.  Us e Jig #268 - 488 - 6 - 5 to remove the
angle head casing cover.
3. Remove the driving gear, bearing, adjusting spacers, and O - rings from the angle head.
4. Remove the driving gear spindle or...

- 9   -Disassembly and Reassembly of the Angle Head Section  (cont.)
UAN - 611R & 701R   UAN - 830 & 950  
Part  
Number   Description   Part  
Number   Description  
1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
11   Angle Casing Cover  
Adjusting Spacer  
O - Ring
Bearing
Retainer Pin
Anvil
Driving Gear
Roller Pin
Needle Roller Bearing
Grease Cup
Angle Casing 12  
13  
14  
15  
16  
17  
18  
19  
20  
21   Locking Nut  
Snap Ring  
Driving Gear  
Needle Roller Bearing  
Bushing  
Spacer  
Adjustment...

- 10   -Disassembly and Reassembly of the Air Motor
Disassembly  
1. On th e UAN - 611R and 701R, separate the air motor casing and the gear casing.  On the UAN 830 and 950,
separate the handle casing from the air motor casing by loosening the valve body nut (right hand).
2. On the UAN 611R and 701R, pull the air motor out of the cas ing.  On the UAN - 830 and 950, the air motor
slides out the back of the casing.
3. Pull the front plate off and remove the bearing.
4. Remove the blades from the rotor.
5....

- 11   -Disas sembly and Reassembly of the Air Motor  (cont.)
UAN - 611R & 701R   UAN - 830 & 950  
Part  
Number   Description   Part  
Number   Description  
1  
2  
3  
4  
5   Bearing  
Pin  
Front Plate  
Rotor  
Blade   6  
7  
8  
9   Cylinder  
Rear Plate  
Bearing  
Roll Pin   

- 12   -Troubleshooting
PROBLEM   CAUSE   SOLUTION  
Loses torque every time the 
fastener is run down.  Finally 
the tool will not run.   The Lock Pin did not get put back 
into the Spring Retainer.   Put the Lock Pin in the 
Spring Retainer.  
Tool operates intermitt ently.   One or more of the shoulders on 
the Pilot Pin is rounded.   Replace the Pilot Pin.  
Tool shuts off as soon as it is 
started or shuts off but will not 
re - start.   Spring under Pilot Pin has lost 
tension.  
Replace the Notch...

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LIT - MAN440  
Rev. 
03/2016  Printed in USA  
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