Aimco URW Series Mode d'emploi

PO Box 16460, Portland, OR 97292-0460 503-254-6600 Fax 503-255-2615

URW Series

URW-6, 8, 9, 10 & 12 Series

Repair Manual

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

October 2006 -1-

Tools Needed for Repair

1. One Set of T-Handle Metric Allen Wrenches

2. Flat-Bladed Screwdrivers

3. Brass Hammer

4. Dead Blow Hammer

5. 10 oz. Ball Peen Hammer

6. One Set of Pin Punches

7. One Set of O-Ring Picks

8. 6” Adjustable 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 Sandpaper

13. Lap Plate

14. Loc-Tite #242

15. CFC Free Degreaser-Cleanser

16. Loc-Tite Accelerator

17. Arbor Press

18. UTA-204 and UMS Transducers and UFT Joint Simulators

19. Needle Nose Pliers

20. Propane Torch

October 2006 -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. Remove the Cam Casing from the tool (left-hand thread).

•On the URW-6, you must loosen the Gear Casing Lock Nut first and then remove the Connector, Cam,

Bearing, Spacer, Thrust Washers, and Thrust Bearing.

•On the URW-8N & 9N, over-tightening the Handle Nut will keep the Casing from turning.

4. Remove the Operating Rod, Cam Roller, Cam Roller Pin, Cam Roller Push Pin(s), and Spring(s).

5. Thoroughly clean all parts.

Inspection of Parts for Wear

1. Rod Guides:The Ratchet should turn freely in the Rod Guides but should not move from side to side;

replace as needed.

2. Ratchet and Checker:The teeth should come to a point; replace if they are rounded off. The flats inside

of the Ratchet should not be pitted or grooved; replace as needed.

3. Operating Rod:The end of the Rod that contacts the Ratchet should come to a point; replace if it’s

rounded.

4. Cam Roller and Cam Roller Pin:The Cam Roller should be round and smooth; replace if it has flat spots

and pitting. The Cam Roller Pin should be inspected for shininess and grooving; replace as needed.

5. Rod Plate Spring:Inspect the Rod Plate Spring for cracks and wear from the Operating Rod; replace as

needed.

6. Springs:Check for the correct dimension of the Spring; replace as needed.

Reassembly

1. Install the Cam Roller Push Pin(s) and Spring(s) into the Cam Casing. Put a light coat of grease on both

parts.

2. Install the Cam Roller and the Cam Roller Pin into the Operating Rod. Now install the Operating Rod into

the Cam Casing making sure that the Cam Roller Push Pin gets under the Cam Roller Pin. Put a light coat

of grease on all parts.

3. Put a light coat of grease on the Operating Rod and install the Rod Plate Spring.

4. Install the Springs and Checker onto the Cam Casing.

5. Install the Ratchet and Rod Guides being sure to line up the slot in the Rod Guide with the notch on the

Checker. Install the Rod Guide Bolts and Nuts and tighten.

6. When installing the Cam Casing Assembly back onto the Gear Casing, the Cam Casing Assembly will have

to be shimmed to adjust the Operating Rod to the Ratchet.

October 2006 -3-

Disassembly and Reassembly of the Cam Casing (cont.)

Adjusting the Cam Casing Assembly

For all Tools Except the URW-6:

1. While running the tool, reinstall the Cam Casing to the Gear Casing.

2. Watch the Ratchet as the Cam Casing turns down onto the Gear Casing. When the Ratchet starts to turn,

mark its position and continue to allow the Cam Casing to turn down onto the Gear Casing until the Ratchet

stops or the Cam Casing bottoms out.

3. Turn the Cam Casing back halfway between the two points and measure the amount of Adjusting Spacers it

will take to take up the space between the Cam Casing and the Gear Casing.

For the URW-6 Only:

1. Install the Connector into the Gear Casing. Now install the Thrust Washers, Thrust Bearing, Spacer,

Bearing, and Cam into the Connector.

2. While running the tool, reinstall the Cam Casing onto the Connector.

3. Watch the Ratchet as the Cam Casing turns down onto the Connector. When the Ratchet starts to turn, mark

its position and continue to allow the Cam Casing to turn onto the Connector until the Ratchet stops or the

Cam Casing bottoms out.

4. Turn the Cam Casing back halfway between the two points and measure the distance from the bottom of the

Cam Casing to the top of the Gear Casing.

5. Turn the Cam Casing down until it bottoms out and measure the distance from the bottom of the Cam

Casing to the top of the Gear Casing. Subtract the two measurements; this is the amount of Adjusting

Spacers that should be put between the Cam Casing and the Connector.

October 2006 -4-

Disassembly and Reassembly of the Cam Casing (cont.)

URW - Cam Casing

Part

Number

Description

Part

Number

Description

Checker

Ratchet

Snap Ring

Spring

Rod Guide Left

Round Head Screw

Rod Plate Spring

Spring Washer

Cam Roller Pin

Operating Rod

Cam Roller

Spacer (URW-8N only)

Rod Guide Nut

Spring

Cam Roller Push Pin

Cam Casing

Grease Cup

Rod Guide Right

Rod Guide Bolt

October 2006 -5-

Disassembly and Reassembly of the Gear 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, Planet Gears, Needle Roller Bearings, and Bearing.

c. Remove the Allen Head Dog Point Screw from the side of the Gear Casing. Remove the Internal Gear

and Bearing.

3. On the URW-8N & 9N:

a. Using a Bearing Separator, put it between the Cam and the Casing to remove the Cam, Key, Bearing,

Thrust Rear Spacer or Spacer, and Thrust Bearing from the Casing.

b. Remove the Casing from the Handle.

c. Remove the Air Motor from the Casing.

d. Remove the Bearing, Gear Cage, Needle Rollers, Planet Gear Bushings (on URW-8N only), and

Internal Gear from the Casing.

4. On the URW-8:

a. Using a Bearing Separator, put it between the Cam and the Casing to remove the Cam, Key, Bearing,

Thrust Rear Washer, and Thrust Bearing from the Casing.

b. Remove the Gear Casing from the Handle.

c. Remove the Gear Cage, Roller Pins, Planet Gear Bushings, and Planet Gears from the Gear Casing.

d. Remove the Internal Gear from the Gear Casing.

5. On the URW-10N, 12N, 12NA & 12NB:

a. Remove the Cam, Bearing, and Spacer from the Gear Casing.

b. Remove the Gear Casing from the Casing. Note:Over-tightening the Handle Nut will help keep the

casing from turning.

c. Remove the Gear Cage, Planet Gear Pins, Needle Roller Bearing, Bearing, and Planet Gears from the

Gear Casing.

6. Thoroughly clean all parts and blow dry.

Inspection of Parts for Wear

1. Cam:Inspect for pitting and flat spots; replace as needed.

2. Needle Rollers and Planet Gear Pins:Inspect for shininess and grooving; replace as needed.

3. Planet Gears and Internal Gears:Inspect teeth for pitting and grooving; replace as needed.

4. Bearings:Inspect for side play and knocking; replace as needed.

October 2006 -6-

Disassembly and Reassembly of the Gear Casing (cont.)

Reassembly

1. Grease all Bearings, Gears, and Internal Gears.

2. For the URW-6 Only:

a. Install the Bearing, Internal Gear, and Allen Head 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. Put

the Roller Pins into the Gear Cage and through the Planet Gears.

c. Install the Spacer onto the Gear Cage and install the Gear Cage into the Gear Casing. Install the

Bearing into the Gear Cage.

d. Install the Gear Casing onto the Air Motor Casing.

e. Install the Connector onto the Gear Casing and install the Thrust Washers, Thrust Bearing, Spacer,

Bearing, and Cam into the Connector.

3. For the URW-8N & 9N:

a. Install the Internal Gear into the Casing.

b. Install the Planet Gear Bushing (URW-8N only) into the Planet Gear and install them into the Gear

Cage. Install the Needle Rollers into the Gear Cage.

c. Install the Gear Cage into the Casing and install the Key into the Gear Cage.

d. Install the Bearing, Thrust Rear Spacer or Spacer, and Thrust Bearing onto the Cam. Press the Cam

onto the Gear Cage making sure to line up the Key in the Gear Cage with the key way in the Cam.

Note:The Gear Cage should extend out past the Cam about 2mm.

4. For the URW-8:

a. Install the Internal Gear into the Gear Casing.

b. Install the Planet Gear Bushing into the Planet Gears and install the Planet Gears into the Gear Cage.

Install the Needle Rollers into the Gear Cage.

c. Install the Gear Cage into the Gear Casing and install the Key into the Gear Cage.

d. Install the Bearing, Thrust Rear Spacer or Spacer, and Thrust Bearing onto the Cam. Press the Cam

onto the Gear Cage making sure to line up the Key in the Gear Cage with the key way in the Cam.

Note:The Gear Cage should extend out past the Cam about 2mm.

5. For the URW-10N, 12N, 12NA, & 12NB:

a. Install the Needle Roller Bearing into the Planet Gears and both Planet Gears into the Gear Cage. Put

the Planet Gear Pins into the Gear Cage and through the Planet Gears.

b. Install the Spacer onto the Gear Cage and install the Gear Cage into the Gear Casing. Install the

Bearing onto the Gear Cage.

c. Install the Bearing and Cam onto the Gear Cage.

October 2006 -7-

Disassembly and Reassembly of the Gear Casing (cont.)

URW-6 - Gear Casing

Part

Number

Description

Part

Number

Description

Cam

Bearing

Thrust Washer

Connector

Cam Casing Lock Nut

Grease Cup

Set Screw

Spacer

Roller Pin

Needle Roller Pin

Planet Gear

Spacer

Thrust Bearing

Adjusting Spacer

Gear Casing

Bearing

Internal Gear

Gear Cage

Bearing

Spacer

October 2006 -8-

Disassembly and Reassembly of the Gear Casing (cont.)

URW - Gear Casing

Part

Number

Description

Part

Number

Description

Cam

Bearing

Spacer

Thrust Bearing

Set Screw

Gear Casing

Internal Gear

Key

Planet Gear

Roller Pin

Bushing

Gear Cage

Bearing

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