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.
