Aimco Brakes Nutrunner UOW Series Repair Manual

							PO 
Box  16460,  Portland, OR  97292-0 460  503-2 54-6600   Fax 503-2 55-2615  UOW Series 
Repair  Manual 
UOW -11 & UOW -T60 Series   www.aimco-global.com 
						

							Contents  
Page  
Number  
1. Tools Needed for Repair 1  
2. Disassembly and Reassembly of the Air Motor 2  
 UOW - 11 Air Motor 3  
 UOW - T60 Air Motor 4  
3. Disassembly and Reassembly of the Clutch
 UOW - T60 5  
4. Disassembly and Reassembly of the Gear Section
 UOW - 11 7  
 UOW - T60 8  
5. Disassembly and Reassembly of Bevel Gear Casing Assembly
 Pinion and Bevel Gear Section 11  
 Socket and Gearing Section 12  
 UOW Bevel Gear Casing 13  
6. Toubleshooting and Preventative Maintenan ce
 UOW - T60 14  
 UOW - 11 14   
						

							- 1   -Tools Needed for Repair  
UOW Series Open - End Wrenches  
1. Flat - Head Screwdriver
2. Dental Pick
3. Needle Nose Pliers
4. Pin Punch
5. Ball Peen Hammer
6. Pin Spanner Wrench (Hook Type)
7. Snap Ring Pliers
8. Crescent Wrench
9. Phillips Impact Drive r
10. Spanner Wrench (Expanding Type)
11. Propane Torch
12. Thread Locker 
						

							- 2   -Disassembly and Reassembly of the Air Motor  
Disassembly  
1. Remove  the  air motor casing from  the  gear casing connector.
2. Ta ke hold of the end of the rotor   and  pull the air motor out of the  casing.
3. Remove  the  front plate spacer and locking pin.
4. Pull  the  front plate off and remove  the  bearing.
5. Remove blades from  the  rotor.
6. Press the rotor out of  the  rear plate bearing and remove  the  bearing from  the  rear plate.
7. Thoroughly clean all parts.
Inspection  
1. Bearings :    Inspect bearings for knocking and side play.
2. Cylinder :    Inspect cylinder for waviness.
3. Plates :    Inspect plates for grooving.
4. Blades :    Inspect blades for splitting and grooving on the sides and ends.
5. Silencer :    Inspect silencer  for dirt.
6. Replace all worn parts.
Assembly  
1. Press greased bearing into  the  rear plate and over  the rotor.   Note :   There should be a slight drag between
the rotor and the rear plate
2. Lightly oil the blade  and install into the rotor flat - side out.
3. Slide  th e  cylinder down over  the  rotor,  and  line up the roll pin with the center hole in the rear plate.
4. Grease bearing and press into  the  front plate.     Install the front pl ate onto the rotor with bearing - side up.
5. Slide the air motor assembly into the casing, li ning up the pinion  with the  side of the front plate with the
slot in the casing.
6. Install locking pin and front plate spacer.
7. Thread the gear motor casing assembly onto the air motor casing and test  the  tool. 
						

							- 3   -Disassembly and Reassembly of the Air Motor   (cont.)  
UOW - 11 Air Motor  
Part 
Number   Description   Part 
Number   Description  
1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
11  
12   Front Plate Bearing  
Front Plate  
Blade  
Rotor  
Cylinder  
Rear Plate  
Rear Plate Bearing  
Rear Plate Spacer  
Packing  
Motor Casing  
Throttle Lever  
Rol l Pin   13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24   Air Inlet Bushing  
Roll Pin  
Valve Bushing  
Reverse Valve  
Valve Rod  
O - Ring  
Valve Plug  
O - Ring  
Cone Spring  
Valve Rod Cap  
Valve  
Silencer   
						

							- 4   -Disassembly and Reassembly of the Air Motor   (cont.)  
UOW - T60 Air Motor  
Part 
Number   Description   Part 
Number   Description  
1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
11  
12  
13  
14  
15   Front Plate Spacer  
Pin  
Blade  
Roll Pin  
Roll Pin  
Rear Plate Bearing  
Rear Plate Spacer  
Casing Bushing  
Packing  
Casing  
Throttle Lever  
Roll Pin  
Air Inlet Bushing  
Front Pla te Bearing  
Front Plate   16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30   Rotor  
Cylinder  
Rear Plate  
Valve Rod  
Shut - off Valve  
Valve Bushing  
Reverse Valve  
Valve Rod  
O - Ring  
Valve Plug  
O - Ring  
Cone Spring  
Valve Rod Cap  
Valve  
Silencer   
						

							- 5   -Disassembly and Reassembly o f the Clutch  
UOW - T60  Clutch  
Disassembly  
1. Separate the hammer casing from the hammer casing connector and remove the clutch assembly.
2. Remove the clutch spring, spring retainer, and backup ring from cam guide.
3. Carefully slide the cam ring up and remove  the four balls from under it.  Now remove the cam ring.
4. Lift the hooked end of the band spring 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.   CAUTION :    Do not bend  or stretch
the band spring.
5. Remove the retaining ring from the back of the cam guide.
6. Slide the cam and pilot pin out of the cam guide.  Remove the pilot pin from the cam.
7. Remove the ball and spring out of the cam guide.
8. Clean all parts thoroughly.
In spection  
1. Cam :    Inspect the cam lobes for grooving where they push the balls out against the cam ring.
2. Pilot Pin :    Inspect the shoulder that is pushed up against the notch pin for rounding.
3. Notch Pin :    Inspect the ends for rounding.
4. Cam Ring :    Inspect t he inside surface where the balls ride for pitting and grooving.
5. Balls :    Inspect for pitting.
6. Spring :    Inspect all springs for tension.
7. Replace all worn parts.
Assembly  
1. Press the “G” pin into the pilot pin and install the pilot pin into the cam with t he square - end up.
2. Put the spring and ball into the cam guide and slide the cam into the cam guide.
3. Install the retaining ring into the back of the cam guide.
4. Install the notch pin into the cam guide and slide the band spring back into place.  Now rotate   the cam and
make sure the notch pin is pushing the band up.
5. Put a small amount of grease into each of the holes in the cam guide and install the balls.
6. Slide the cam ring down onto the balls.
7. Put the backup ring and spring retainer down onto the cam ri ng.
8. Install the clutch spring and set the clutch assembly back in the tool.
9. Test the tool. 
						

							- 6   -Disassembly and Reassembly of the Clutch   (cont.)  
UOW - T60 Clutch  
Part 
Number   Description   Part 
Number   Description  
1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
11  
12  
13  
14   Hammer Casing Nut  
Ball  
Regulating Dial  
Regulating Screw  
Hammer Casing  
Bearing  
Spring Setter  
Ball  
Snap Ring  
Torque Spring  
Spring Retainer  
Cam Ring  
Spacer  
Notch Pin   15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27   Notch Pin Band  
Spring  
Ball  
Pilot Pin  
Cam  
Snap Ring  
T hrust Bearing  
Retainer  
Outer Snap Ring  
Cam Guide  
Ball  
G - Pin  
Trust Washer   
						

							- 7   -Disassembly and Reassembly of the Gear Section  
UOW - 11 Gear Section  
Disassembly  
1. Remove the gear casing from the air motor casing (right - hand threads).
2. Remove the first and seco nd gear cage and planet gears.
3. Remove bearing from the gear case.
4. Clean all parts thoroughly.
Inspection  
1. Gears :    Inspect the teeth of the gear casing and the planet gears for pitting and grooving.
2. Needle Rollers :    Inspect the needle rollers for wear.
3. Bearings :    Inspect bearing for side play and knocking.
4. Replace all worn parts.
Assembly  
1. Install the bearing into the gear case.
2. Install the second gear cage into casing.
3. Install the needle roller and second planet gears.  Put a small amount of grease   by each planet gear and on
the gear cage.
4. Install the gear cage spacer.
5. Install the needle roller and planet gear onto the first gear cage, then slide assembled gear cage into gear
casing (lightly grease all parts during assembly).
6. Install the gear cas ing assembly onto the air motor casing and test the tool.