12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Caterpillar


Circle Drive

Usage:

Remove Circle Drive

Start By:

a. remove circle drive motor


Typical Example

1. Remove plug (5). Drain the oil from the circle drive housing. Put the plug in position in the housing.

2. Remove nuts (4) and washers.

3. Bend the lock away from nut (3). Remove nut (3), the lock, spacer (2) and the O-ring seal from the shaft.


Typical Example

4. Remove bolts (7) and washers that hold the housing to the circle drawbar.

5. Remove three bolts (6) that hold cover to the circle drive housing.


Typical Example

6. Install tooling (A) and a hoist to the circle drive housing.

7. Lift circle drive (8) away from the drawbar far enough to remove pinion (3) from the shaft and from engagement in the circle.

8. Remove pinion (3). Remove circle drive (8). Weight of the circle drive is 97 Kg (215 lb.).


Typical Example

9. Remove thrust washer (9) from pinion.

10. Remove Duo-Cone seal (10) from pinion.


Typical Example

11. Remove Duo-Cone seal (11) from circle drive pinion.

Install Circle Drive

NOTE: See the topic, Duo-Cone seals, (Conventional) before installing any of the Duo-Cone seals.

1. Make sure the Duo-Cone seals for the pinion and the circle drive housing are clean and dry. Make sure all the metal surfaces, with which the seals make contact, are clean and dry.


Typical Example


Typical Example

2. Install the Duo-Cone seals in circle drive housing (8) and the pinion (1) with tooling (B).

3. Install thrust washer (9) on the face of pinion (1).

4. Put a small amount of oil on the surfaces of the Duo-Cone seals that make contact with each other.


Typical Example

5. Install tooling (A) and a hoist on the circle drive housing (8).

6. Put circle drive housing (8) in position over the circle drawbar. Install pinion (1) on the shaft of the circle drive and on the circle. Lower the circle drive on to the drawbar.

7. Remove the hoist and tooling (A) from circle drive housing. Install three bolts in housing.


Typical Example

8. Lubricate bore lightly with lubricant being sealed. Install O-ring seal (13), spacer (2), lock (14) and nut (3) on the shaft of the circle drive. Tighten nut (3) to a torque of 325 ± 27 N·m (240 ± 20 lb.ft.). Bend lock (14) across the flat surface of nut (3).

9. Install nuts (4) and washers on studs (12). Tighten the nuts to a torque of 390 ± 25 N·m (290 ± 20 lb.ft.).

10. Install the bolts that hold the circle drive to the circle drawbar from the top.

11. Fill the circle drive housing to its correct level.

End By:

a. install circle drive motor

Disassemble Circle Drive

Start By:

a. remove circle drive

1. Put the circle drive in position on blocks as shown. Remove four nuts (1), retainer housing (2) and shims from housing assembly.

2. Remove bearing cup (3) from retainer housing.

3. Remove five bolts (5) and cover (4). Remove coupling (6) and the worm gear with bearings.

4. Remove bearing (7) from cover (4).

5. Remove bearings (8) and (10) from worm (9) with tooling (A).

6. Remove gear (11) and shaft (12) as a unit.

7. Remove bolts (13) that hold the gear to the shaft. Remove the gear from the shaft.

8. Remove thrust washer (14) and bearing (15) from housing.

9. Remove the bearing cup from housing (16) with tooling (B).

Assemble Circle Drive

1. Lower the temperature of bearing cup (17). Install the cup in the housing (16).

2. Install the bearing in housing (16) with tooling (C) to a depth of 2.0 ± 0.5 mm (.079 ± .020 in.) below the surface of housing (1).

3. Put gear (11) in position on shaft (12). Install the gear with the deeper side toward the flange on the shaft.

4. Install the nuts, washers and bolts that hold gear (11) to shaft (12). Tighten bolts to a torque of 270 ± 25 N·m (200 ± 20 lb.ft.).

5. Put thrust washer (14) in position in the housing.

6. Put the shaft and gear assembly (17) in position in housing (16).

7. Heat bearings (7) and (9) to a maximum temperature of 135° C (275° F).

8. Install bearings (8) and (10) on worm (9).

9. Put worm (9) and the bearings in position in housing (16). Make sure bearing (10) is in contact with the bearing cup in housing (16).

10. Lower the temperature of bearing cup (3) and install in the retainer housing (2).

11. Put retainer housing (2) in position on the circle drive housing. Do not install the O-ring seal or the shims. Install the nuts that hold the carrier housing to the circle drive housing.

12. Install tooling (D) on the carrier housing and against worm (9). Tighten nuts (1) evenly while worm (9) is moved. Tighten nuts (1) until the shaft end play is zero. Measure the distance between retainer housing (2) and the circle drive housing with a feeler gauge. Remove retainer housing (2) and tooling (D).

13. Torque nut (1A) to 20 N·m (15 lb ft) and nut (1B) to 40 N·m (30 lb ft). Then, torque nut (1A) to 80 N·m (60 lb ft) and nut (1B) to 80 N·m (60 lb ft). Rotate the worm 3 revolutions then back off the nuts. Torque nut (1A) to 20 N·m (15 lb ft) and nut (1B) to 40 N·m (30 lb ft) and then torque nut (1A) to 40 N·m (30 lb ft). Rotate the worm 3 revolutions. Torque nut (1A) to 40 N·m (30 lb ft) and nut (1B) to 40 N·m (30 lb ft). Measure the average gap between the housing and adapter at the locations being torqued. Subtract 0.145 ± 0.065 N·m (0.107 ± 0.05 lb ft) to obtain the desired shim pack thickness.

14. Install coupling (6) on worm shaft.

15. Install the bearing in cover (4), for the circle drive housing, with tool (C). Inspect, and make an O-ring seal replacement if necessary. (Lubricate bore lightly with lubricant being sealed).

16. Put cover in position on the circle drive housing and install five bolts.

End By:

a. install circle drive

Disassemble Circle Drive With Slip Clutch

Start By:

a. remove circle drive

1. Put circle drive on blocks as shown. Remove four nuts (1), the lock washers, bracket (2) from circle drive housing (3).

2. Remove O-ring (5) and bearing cup (4) from bracket (2). Remove shims (6) from the bracket.

3. Remove bolts (7), cover (8) and the O-ring from bracket (2). Remove coupling (9) and the worm assembly from the housing.

4. Remove bearings (10) and (12) from worm (11) with tool (A).

5. Remove bearing (13) from cover (8).

6. Remove three bolts (14) and washers. Remove plate (15).

7. Remove shims (17), spacer (16). Remove spring (18) and spacer (19).

8. Remove clutch discs (20).

9. Remove spacer (21), gear (22) and shaft (23).

10. Remove thrust washer (24) and bearing (25) from housing (3).

11. Remove bearing cup (26) from housing (3) with tool (B).

Assemble Circle Drive With Slip Clutch

1. Lower the temperature of bearing cups (25) and (26). Install bearing cup (26) in housing (3).

2. Install bearing cup (25) in housing (3) with tool (C) to a depth of 2.0 ± 0.5 mm (.079 ± .020 in.) below the surface of housing (3).

3. Put thrust washer (24) in position on housing (3).

4. Install shaft (23), gear (22) and spacer (21) in the housing.

5. Install clutch discs (20). Be sure and install disc with internal spline first, then alternate the discs.

6. Install spacer (19) on disc (20). Install spring (18) and spacer (16).

7. Install shims (17) until shims are 1.5 to 1.65 mm (.060 to .065 in.) below the top of spacer (16).

8. Install plate (15) and three bolts (14) and washers. Tighten the bolts to a torque of 130 ± 7 N·m (95 ± 5 lb.ft.).

9. Heat bearings (10) and (12) to a maximum temperature of 135° C (275° F).

10. Install bearings (10) and (12) on worm (11). Install the worm assembly into housing (3).

11. Lower the temperature of bearing cup (13). Install bearing cup (13) in cover (8) with tool (C).

12. Lower the temperature of bearing cup (4). Install bearing cup (4) in bracket (2).

13. Put bracket (2) in position on the circle drive housing (3). Note: do not install O-ring seal (5) or shims (6) on bracket (2).

14. Install tool (D) on bracket (2) and against worm (11). Install nuts (1) and tighten evenly while worm (11) is moved. Tighten nuts (1) until the worm end play is zero.

15. Measure the distance between bracket (2) and circle drive housing (3) with a feeler gauge (27). Remove bracket (2) and tooling (D).

16. Install correct amount of shims on bracket (2) to give a preload dimension of .00 to .13 mm (.00 to .005 in.).

17. Install O-ring seal (5) on bracket (2).

18. Install the O-ring in the circle drive housing. Position cover (8) and install bolts (7). Install coupling (9) on worm (11).

19. Position bracket (2) on circle drive housing (3). Install lockwashers and nuts (1).

End By:

a. install circle drive

Caterpillar Information System:

12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Circle Drive Motor
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Circle Drawbar
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Swivel Joint
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Blade Tip Cylinder
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Blade Centershift Cylinder
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Blade Sideshift Cylinder
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Centershift Lockplate Bushings
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Blade Lift Bar
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Centershift Lock Control Valve
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Centershift Lock
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Blade Lift Arms
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Ball And Socket Joint Inserts
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Hydraulic Tank
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Pump Drive
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Pressure And Flow Compensator Valve
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Hydraulic Pump
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Hydraulic Control Valves
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Brake Control Valve
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Parking Brake Rotochamber And Release Valve
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Parking Brake Release Valve
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Differential Lock Actuator Valve
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Fuel Tank
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Articulation Cylinders
12G, 120G, 130G & 140G MOTOR GRADER VEHICLE SYSTEMS Hydraulic Cylinders
Back to top
The names Caterpillar, John Deere, JD, JCB, Hyundai or any other original equipment manufacturers are registered trademarks of the respective original equipment manufacturers. All names, descriptions, numbers and symbols are used for reference purposes only.
CH-Part.com is in no way associated with any of the manufacturers we have listed. All manufacturer's names and descriptions are for reference only.