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Aimco Brakes Nutrunner URW Series Repair Manual

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Page 1

PO 
Box  16460, Portland, OR   97292-0460  503-2 54-6600   Fax 503-2 55-2615  URW Series
  URW - 6, 8, 9, 10 & 12 Series  
Repair Manual  
www.aimco-global.com 

Page 2

 
 
 
Contents 
 
 
 Page 
 Number 
 
1. Tools Needed for Repair 1 
 
2. Disassembly and Reassembly of the Cam Casing 2-4 
 
3. Disassembly and Reassembly of the Gear Section 5-9 
 
4. Disassembly and Reassembly of the Air Motor Section 10-14 
 
5. Recommended Maintenance 15  

Page 3

- 1   -Tools Needed for Repair  
1. One  Set  of  T - H andle Metric Allen Wrenches
2. Flat - Bladed Screwdrivers
3. Brass Hammer
4. Dead Blow Hammer
5. 10 oz. Ball Pee n Hammer
6. One  Set  of  Pin Punches
7. One  Set  of  O - Ring Picks
8. 6”  Adj ustable End Wrench
9. 12”   Adjustable End Wrench
10. Medium Pair Channel Locks or Adjustable Jaw Pliers
11. Medium Honing Stone
12. 220 Grit Wet/Dry Sandp aper
13. Lap Plate
14. Loc - Tite #242
15. CFC Free Degreaser - Cleanser
16. Loc - Tite Accelerator
17....

Page 4

- 2   -Disassembly and Reassembly of the Cam Casing  
Disassembly  
1. Remove the Rod Guide Bolts and Rod Guide Nuts.
2. Remove the Rod Guides, Ratchet, Checker, Springs ,   and Rod Plate Spring.
3. Rem ove the   Cam Casing from the tool (left - hand thread).
 On the URW - 6 ,   you must loosen the Gear Ca sing Lock Nut first and then  remove the Connector, Cam,
Bearing, Spacer, Thrust Washers ,   and T hrust  Bearing.
 On the URW - 8N  &   9N , over - tightening the Ha ndle Nut   will keep the Casing...

Page 5

- 3   -Disassembly and Reassembly of the Cam Casing   (cont.)  
Adjusting the Cam Casing Assembly  
For all  T ools  E xcept the URW - 6 :  
1. While running the tool,  reinstall the Cam Ca sing to the Gear Casing.
2. Watch  the Ratc het as the Cam Casing turns down  onto the Gear Casing.  When the  Ratchet starts to turn ,
mark its position and conti nue to allow the Cam Casing to  turn down onto the Gear Casing until the R atchet
stops or the Cam Casing bottoms out.
3. T urn the Cam Casing   back half...

Page 6

- 4   -Disassembly and Reassembly of the Cam Casing  (cont.)  
URW  -   Cam Casing  
Part 
Number   Description   Part 
Number   Description  
1  
2  
3  
4  
5  
6  
7  
8  
9  
10   Checker  
Ratchet  
Snap Ring  
Spring  
Rod Guide Left  
Round Head Scre w  
Rod Plate Spring  
Spring Washer  
Cam Roller Pin  
Operating Rod   11  
12  
13  
14  
15  
16  
17  
18  
19   Cam Roller  
Spacer (URW - 8N only)  
Rod Guide Nut  
Spring  
Cam Roller Push Pin  
Cam Casing  
Grease Cup  
Rod Guide Right  
Rod...

Page 7

- 5   -Disassembly and Reassembly of the Ge ar Casing  
Disassembly  
1. Remove the Cam Casing (left - hand thread).
2. On the  URW - 6   Only :
a. Remove the Connector from the Cam Casing.    Remove the Cam, Bearing,  Spacer, Thrust Washers ,   and
Thrust Bearing.
b. Remove the Gear Casing, Gear Cage, Roller Pins, P lan et Gears, Needle Roller  Bearings ,   and Bearing.
c. Remove the Allen Head Dog Point Screw from the si de of the Gear Casing.  R emove the Internal Gear
and Bearing.
3. On the  URW - 8N...

Page 8

- 6   -Disassembly and Reassembly of the Gear Casing   (cont.)  
Re assembly  
1. Grease all Bearings, Gears ,   and Internal Gears.
2. For   the  URW - 6   Only :
a. Install the Bearing, Internal Gear ,   and Allen He ad Dog Point Screw into the  Gear Casing.
b. Install the Needle Roller Bearing into the Planet   Gears and both Planet Gears  into the Gear Cage.    P ut
the Roller Pins in to the Gear Cage and thr ough  the Planet Gears.
c. Install the Spacer onto the Gear Cage and install  the Gear Cage...

Page 9

- 7   -Disassembly and Reassembly of the Gear Casing  (cont.)  
URW - 6  -   Gear Casing  
Part 
Number   Description   Part 
Number   Description  
1  
2  
3  
4  
5  
6  
7  
8  
9  
10   Cam  
Bearing  
Thr ust Washer  
Connector  
Cam Casing Lock Nut  
Grease Cup  
Set Screw  
Spacer  
Roller Pin  
Needle Roller Pin   11  
12  
13  
14  
15  
16  
17  
18  
19  
20   Planet Gear  
Spacer  
Thrust Bearing  
Adjusting Spacer  
Gear Casing  
Bearing  
Internal Gear  
Gear Cage  
Bearing  
Spacer   

Page 10

- 8   -Disassembly an d Reassembly of the Gear Casing  (cont.)  
URW  -   Gear Casing  
Part 
Number   Description   Part 
Number   Description  
1  
2  
3  
4  
5  
6  
7   Cam  
Bearing  
Spacer  
Thrust Bearing  
Set Screw  
Gear Casing  
Internal Gear   8  
9  
10  
11  
12  
13   Key  
Planet Gear  
Roller Pin  
Bu shing  
Gear Cage  
Bearing   
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