Aimco Brakes Nutrunner UAN Series Repair Manual

							PO 
Box  16460,  Portland, OR  97292-0460     503-254-6600     Fax  503-2 55-2615   UAN Series  
Pneumatic Nutrunner  
Repair Manual  
www.aimco-global.com 
						

							Contents  
Page  
Number  
1. Tools Needed for Repair of UAN Series Pneumatic Nutrunner 1  
2. Disassembly and Reassembly of Clutch (UAN 611R & 701R) 2 - 3  
3. Disassembly and Reassembly of Clutch (UAN   830 & 950) 4 - 5  
4. Disassembly and Reassembly of Gear Section 6 - 7  
5. Disassembly and Reassembly of the Angle Head Section 8 - 9  
6. Disassembly and Reassembly of the Air Motor 10 - 11  
7. Troubleshooting and Preventative Maintenance 12   
						

							- 1   -Tools Needed for R epair of UAN Series  
1. Phillips Driver #1 and #2
2. Dental Pick
3. Pin Spanner (351)
4. Needle Nose Pliers
5. Pin Punch
6. Ball Peen Hammer (8 oz.)
7. Standard Pliers
8. Snap Ring Pliers
9. Crescent Wrench
10. Lock Ring and Horseshoe Washer Plie rs (Proto - P250)
11. Propane Torch (Turner Self - Lighting)
12. 471 - 670 - 7 - 1 Jig to Insert the Notch Pin Band on the Cam Guide
13. 517 - 065 - 4 - 5 Jig for Disassembly and Assembly of Driving Gear Spindle Screw
14. 268 - 488 - 6 - 5 Jig for Disassembly and Assembly of Ang le Casing Cover for the UAN - 611R & 701R - 60C
15. 259 - 488 - 6 - 5 Jig for Disassembly and Assembly of Angle Casing Cover for the UAN - 701R - 30C & 40C 
						

							- 2   -Disassembly and Reassembly of Clutch UAN - 611R and 701R  
Disassembly  
1. Separate the clutch casing (left hand) from   the gear casing and remove the clutch assembly.
2. Remove the regulator screw by inserting a Phillips driver between it and the stopper and turn the Phillips
driver counter - clockwise to remove the regulator screw.
3. Remove the stopper being careful not to lo se the pin that locks the stopper to the cam guide.
4. Remove the torque spring and spring setter from the cam guide.
5. Remove the cam rollers, cam ring, balls, and cam from the cam guide.
6. Remove the ball and spring from the cam.
7. Lift the hooked end of the  notch pin band out of the hole in the cam guide and slide it around the cam guide
until the end of the notch pin is exposed.  Now remove the notch pin and pilot pin from the cam guide.
Inspection  
1. CAM : Inspect the cam lobes for grooving where they push   the balls out against the cam ring.  
PILOT PIN : Inspect the shoulder that is pushed up against the notch pin for rounding.  
NOTCH PIN : Inspect the ends for rounding.  
BAND : Inspect the band.  The band should set down in the groove of the cam guide so that  space 
from the band to the outside of the cam guide is the same all the way around.  
BALLS : Inspect for pitting.  
2. Inspect all springs for tension.
3. Replace all worn parts.
Reassembly  
1. Install the spring and ball into the cam.
2. If replacing the pilot pin,   press the new “G” pin into the pilot pin.  Install the pilot pin “G” pin out into the
cam guide.
3. Install the cam into the cam guide.  Rotate the cam.  The lobe on the pilot pin should appear in the hole that
the notch pin goes into at the same time that  the lobe comes up in the slot of the cam guide.  If it does not
pull the cam out halfway and rotate 180°, push it back into the cam guide and try again.   Note :    The lobe on
the pilot pin and the lobe on the cam need to line up.
4. Holding the cam and cam gui de together, put grease into each of the slots in the cam guide.
5. Install two of the larger balls into the slot of the cam guide and put a shot of grease on top of the balls.  On
the 701R, install the three smaller balls.  On the 611R, install the three ba lls of the same size on top of the
two larger balls.
6. Install the cam ring over the balls and install the cam roller into the slot on the cam guide and push them
down against the balls.  Install the spring setter over the cam roller.
7. Install the notch pin   and notch pin band.  If you are replacing the band, slide the Jig #471 - 670 - 7 - 1 down
over the cam guide and install the new band.
8. Install the torque spring, stopper, pin, and regulator screw. 
						

							- 3   -Disassembly and Reassembly of Clutch UAN - 611R and 701R  (cont. )
UAN - 611R & 701R Clutch  
Part  
Number   Description   Part  
Number   Description  
1  
2  
3  
4  
5  
6  
7  
8  
9   Cam  
Pilot Pin Reset Spring  
Inner Snap Ring  
Pilot Pin  
Cam Roller  
Notch Pin  
Cam Ring  
Spring Setter  
Torque Spring   10  
11  
12  
13  
14  
1 5  
16  
17   Steel Ball  
Regulator Screw  
Cam Balls  
Pilot Pin Reset Ball  
G Pin  
Notch Pin Band  
Stopper  
Stopper Pin   
						

							- 4   -Disassembly and Reassembly of Clutch UAN - 830 & 950
Disassembly  
1. Remove the gear casing from the clutch casing (right hand).
2. Locate the lock  pin on the side and in the threaded portion of the clutch casing.
3. Push down on the adjusting shaft and remove the lock pin.
4. Remove the adjusting shaft, spring, cam shaft, adjusting ring, and cam setter from the clutch casing.
Inspection  
1. Inspect the cam   shaft lobes for pitting and grooving.
2. Inspect the cam roller for pitting and grooving.
3. Inspect the cam roller pins for wear.
4. Replace all worn parts.
Reassembly  
1. If you replaced the cam rollers and/or cam roller pins, be sure to peen the cam setter bus hing to the cam
roller pins.
2. Install the cam setter (put grease on the cam rollers), adjusting ring, cam shaft, and spring into the clutch
casing.
3. Thread the adjusting shaft nut onto the adjusting shaft.  Now, align the cut outs on the adjusting shaft nu t
with the tabs on the adjusting ring and align the hole on the adjusting shaft with the hole in the clutch casing
and push the adjusting shaft down into the clutch casing and install the lock pin.
4. Install the gear casing onto the clutch casing.   Note :    U se a good service removable thread locker on
threaded parts. 
						

							- 5   -Disassembly and Reassembly of Clutch UAN - 830 & 950   (cont.)
UAN - 830 & 950 Clutch  
Part  
Number   Description   Part  
Number   Description  
1  
2  
3  
4  
5  
6   Adjusting  Shaft  
Adjusting Shaft Nut  
Torque Spring  
Spring Setter  
Cam Shaft  
Cam Roller   7  
8  
9  
10  
11   Cam Roller Pin  
Cam Shaft Bearing  
Adjusting Ring  
Cam Setter  
Cam Setter Bushing   
						

							- 6   -Disassembly and Reassembly of Gear Section
Disassembly  
1. Using the flats on the ang le casing to put your crescent wrench on, remove the second gear section (left hand).
2. Remove the clutch casing (left hand) and then remove the first gear section (right hand).
3. Now remove the snap rings, bearings, gear cases, roller pin, and planet gears  from the gear casings.
Inspection  
1. Inspect the teeth of the gear casing, internal gear, and planet gears for pitting and grooving.
2. Inspect needle rollers for wear.
3. Inspect bearings for side play and knocking.
4. Replace all worn parts.
Reassembly  
1. Grease   all bearings, planet gears, gear casing, and internal gears.
2. Install snap rings, bearings, planet gears, needle rollers, and gear cages into gear casings and internal gears.
3. Install gear casings and internal gears on the casing and clutch casing.   Note :    Use a good service removable
thread locker on all threaded parts. 
						

							- 7   -Disassembly and Reassembly of Gear Section  (cont.)
First Gear Section UAN - 611R & 701R   Second Gear Section UAN - 611R & 701R  
Gear Section UAN - 830 & 950  
Part 
Number   Description   Part 
Number   Description  
1  
2  
3  
4  
5   O - Ring
Bearing
Spacer
First Gear Cage
Gear Casing 6  
7  
8  
9  
10   Needle Roller  
Planet Gear  
Snap Ring  
Second Gear Cage  
Needle Roller Bearing  8