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 gear cage bearing collar, bearings, spacers, bushings, and driving gear.
O n the UAN - 611R and 701R, use Jig #517 - 06504 - 5 to remove the driving gear spindle.
Inspection  
1. Inspect the driver and driving gear for pitting and grooving.
2. Inspect all bearings for side play and knocking.
3. Replace all worn parts.
Reassembly  
1. Install the   driving gear, bushings, spacers, and driving gear spindle or gear cage bearing collar.   Note :    The
adjustment spacers are for adjusting the gear lash.
2. Install driving gear, spacers, O - ring, and angle head casing cover.   Note :    The adjustment spacers are  used
to adjust the gear lash.
3. Install the angle head casing onto tool.  On the UAN - 830 and 950, use a small amount of a service
removable thread locker. 
						

							- 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 Spacer  
Bearing  
Driving Gear Spindle Retainer Screw  
Gear Cage Bearing Collar  7   
						

							- 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. Press the rotor out of the rear plate bearing and remove the bearing from the rear plate.
Inspection  
1. Inspect bearings for knocking and side play.
2. Inspect cylinder for waviness.
3. Inspect plate for grooving.
4. Inspect blades for splitting and grooving on the sides and ends.
5. Inspect the exhaust filter for dirt.
6. Replace all worn parts.
Reassemb ly  
1. Press the greased bearing into the rear plate and over the rotor.   Note :    There should be a small amount of
drag between the rotor and the rear plate but no light.
2. Lightly oil the blades and install into the rotor with the flat side out.
3. Slide the cy linder down over the rotor, lining up the roll pin with the hole in the rear plate.
4. Grease the bearing and press it into the front plate.  Install the front plate onto the rotor with the bearing side
up.   Note :    The cylinder should be tight between the pl ate, but the rotor should turn freely.
5. Slide the air motor into the casing.  On the UAN - 611R and 701R, line up the pin on the side of the front
plate with the notch in the casing.
6. Install the gear casing or handle back on to the air motor casing. 
						

							- 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 Pin, 
Band, and/or Pilot Pin.  
Replace Spring.  Notch Pin is rounded.  
Notch Pin Band is stretched out of 
shape.  
The shoulders on the Pilot Pin are 
rounded.  
Tool ratchets when it shuts off.   Valve Rod is too long. Shorten Valve Rod.  
Bur on Pilot Pin or inside of Cam.   Clean bur off of Pilot Pin or 
Cam.
Loss of RPMs   Exhaust Filter is dirty causing back 
pressure.   Filter  
Lever type only.  Tool will not 
run.   The Valve Rod is pushed through 
the Shut - off Valve.   Replace Shut - off Valve.  
Tool runs all the time.   O - ring has gotten pushed down
into the Casing. Put the O - ring back into its 
seat.  
Air pressure is too high.  
Tool will not reset.   Shut - off Valve damaged. Replace Shut - off Valve.  
Valve Spindle installed upside 
down.   Reinstall Valve Spindle 
righ t - side up.  
Tool will not reset.   Shut - off Valve damaged. Replace Shut - off Valve.  
Valve Spindle installed upside 
down.   Reinstall Valve Spindle 
right - side up.
Tool will not reset after it shuts 
off.   Pilot Pin and Cam not lined up 
right. Alig n the lobes on the Cam 
and Pilot Pin.  
Recommended Preventative Maintenance  
It is recommended that the whole tool be cleaned and inspected every 250,000 cycles or six months, whichever 
occurs first.   
						

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LIT - MAN440  
Rev. 
03/2016  Printed in USA  
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