Aimco Brakes Nutrunner UAN Series Repair Manual
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- 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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