Aimco UAN-611R Operating instructions

REPAIR MANUAL
UAN Series
Pneumatic Nutrunner

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. Trouble Shooting and Preventive Maintenance 12

January 2004 - 1- Public Server/Manuals/UAN Pneumatic Nutrunner
Tools Needed for Repair 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 Pliers (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 Angle 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

January 2004 - 2- Public Server/Manuals/UAN Pneumatic Nutrunner
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 lose 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 guide 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 balls 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.

January 2004 - 3- Public Server/Manuals/UAN Pneumatic Nutrunner
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
15
16
17
Steel Ball
Regulator Screw
Cam Balls
Pilot Pin Reset Ball
G Pin
Notch Pin Band
Stopper
Stopper Pin

January 2004 - 4- Public Server/Manuals/UAN Pneumatic Nutrunner
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 bushing 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 nut
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:Use a good service removable thread locker on
threaded parts.

January 2004 - 5- Public Server/Manuals/UAN Pneumatic Nutrunner
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

January 2004 - 6- Public Server/Manuals/UAN Pneumatic Nutrunner
Disassembly and Reassembly of Gear Section
Disassembly:
1. Using the flats on the angle 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.

January 2004 - 7- Public Server/Manuals/UAN Pneumatic Nutrunner
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

January 2004 - 8- Public Server/Manuals/UAN Pneumatic Nutrunner
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. Use 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.
On 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.

January 2004 - 9- Public Server/Manuals/UAN Pneumatic Nutrunner
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

January 2004 - 10 - Public Server/Manuals/UAN Pneumatic Nutrunner
Disassembly and Reassembly of the Air Motor
Disassembly:
1. On the 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 casing. 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.
Reassembly:
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 cylinder 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 plate 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.

January 2004 - 11 - Public Server/Manuals/UAN Pneumatic Nutrunner
Disassembly 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

January 2004 - 12 - Public Server/Manuals/UAN Pneumatic Nutrunner
Trouble Shooting
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 intermittently.
One or more of the
shoulders on the Pilot Pin is
rounded.
Replace the Pilot Pin.
Spring under Pilot Pin has
lost tension.
Notch Pin is rounded.
Notch Pin Band is stretched
out of shape.
Tool shuts off as soon as it is started
or shuts off but will not re-start.
The shoulders on the Pilot
Pin are rounded.
zReplace the Notch Pin,
Band, and/or Pilot Pin.
zReplace Spring.
Valve Rod is too long.
Shorten Valve Rod.
Tool ratchets when it shuts off.
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.
O-ring has gotten pushed
down into the Casing.
Tool runs all the time.
Air pressure is too high.
Put the O-ring back into its
seat.
Shut-off Valve damaged.
Replace Shut-off Valve.
Tool will not reset.
Valve Spindle installed
upside down.
Reinstall Valve Spindle
right-side up.
Shut-off Valve damaged.
Replace Shut-off Valve.
Tool will not reset.
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.
Align 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.