768C TRACTOR & 769C TRUCK POWER TRAIN Caterpillar


Differential And Bevel Gear Group

Usage:

Torque for the nuts (not shown) that hold bearing caps (7) and (11) to differential carrier (5) (earlier) ... 700 ± 70 N·m (520 ± 50 lb ft)

Torque for the studs (not shown) that hold bearing caps (7) and (11) to differential carrier (5) (earlier) ... 435 ± 40 N·m (320 ± 30 lb ft)

Torque for the bolts (not shown) that hold bearing caps (7) and (11) to differential carrier (5) (later) ... 1100 ± 150 N·m (820 ± 110 lb ft)

(10) Torque for eight nuts that fasten housings (8) together ... 390 ± 14 N·m (290 ± 10 lb ft)

(19) Torque for bolts that hold cage (20) to carrier (5) ... 135 ± 15 N·m (100 ± 11 lb ft)

(24) Dimension to install dowel in bore ... 7.6 ± 0.5 mm (.30 ± .02 in)

Put 2P2506 Thread Lubricant on the threads of bolts (17) and faces of the washers. Tighten bolts (17) that hold bevel gear (9) to differential housing (8) ... 440 ± 14 N·m (320 ± 10 lb ft)

Adjustment Procedure For the Bevel Pinion Bearings:

1. Install bearings (1) and (4) on pinion (3) and then install pinion in the carrier.

2. Install cage (20) and shims (18).

NOTE: Do not install yoke (21), seal (23) and O-rings (2) and (22) in cage (20) until after the adjustment is made. Turn pinion slowly while the adjustment is made.

3. Use shims (18) as necessary behind cage (20) to put enough preload on the pinion bearings so the torque needed to turn pinion (3) is more than 4.0 N·m (35 lb in)

4. Turn the pinion several revolutions. Change thickness of shims (18) so that a torque of 4.0 ± 0.6 N·m (35 ± 5 lb in) is needed to rotate pinion.

5. Put lubricant on seal (23) and O-rings (2) and (22). Install seal (23) and O-ring (2) on cage (20). The lip of seal (23) must be toward bearing (1). Tighten bolts (19) to a torque of 135 ± 14 N·m (100 ± 11 lb ft). Install O-ring (22) and yoke (21) on pinion (3).

Adjustment Procedure For Free Movement (Backlash) Between The Bevel Pinion And The Bevel Gear:

1. Install the gears in differential housing (8). Turn the gears. The torque needed to turn the gears must not be more than ... 35 N·m (25 lb ft)

2. Install differential housing assembly (8) complete with the bearing cups and cones in carrier (5).

3. (Earlier) Install bearing caps (7) and (11) and nuts. At this time, do not tighten the nuts to full torque.

3. (Later) Install bearing caps (7) and (11) and bolts. At this time, do not tighten the bolts to full torque.

4. Put the carrier in a position so the centerline for the axles is vertical and the teeth of bevel gear (9) are toward the top.

5. Use a dial indicator to measure the backlash between bevel gear (9) and pinion (3) at four different points on the bevel gear. Find the average backlash.

6. Turn adjustment ring (16) until the average backlash between bevel gear and pinion (3) is ... 0.36 ± 0.13 mm (.014 ± .005 in)

7. (Earlier) Tighten the four nuts on bearing caps (7) and (11) to a torque of ... 700 ± 70 N·m (520 ± 50 lb ft)

7. (Later) Tighten the four bolts on bearing caps (7) and (11) to a torque of ... 1100 ± 150 N·m (820 ± 110 lb ft)

Adjustment Procedure For Preload Of The Differential Bearing:

1. To get maximum preload on carrier bearings, use a dial indicator to measure change in dimension (A). Fasten the indicator on the differential assembly and put the pointer on bearing cap (7).

2. Turn adjustment ring (6) and increase dimension (A) to ... 0.51 to 0.64 mm (.020 to .025 in)

3. Turn bevel gear in both directions for several revolutions.

4. Decrease dimension (A) to ... 0 mm (0 in)

5. Increase dimension (A) to ... 0.38 ± 0.05 mm (.015 ± .002 in)

6. Use a dial indicator to check the free movement (backlash) between bevel gear (9) and pinion (3). Turn adjustment rings (6) and (16) the same amount and in the same direction until the backlash is ... 0.36 ± 0.13 mm (.014 ± .005 in)

NOTE: If the adjustment rings are turned like this, there will be no change in the preload of the bearings.

Adjustment Procedure To Get Distance (B), Between Bearing Cap (11) And Pin (15):

NOTE: To get the correct clearance (B) between pin (15) and bearing cap (11) of the carrier assembly, use the procedure that follows:

1. Install the differential carrier (5) into the axle housing.

2. Install pin (15) and cover (12). Do not install shims (14) at this time.

3. Tighten bolts (3) evenly until pin (15) is against bearing cap (11) of the carrier assembly. Use a feeler gauge to measure the distance between the cover and the axle housing.

4. Make a thickness of shims the same as the distance measured minus 0.05 ± 0.03 mm (.002 ± .001 in). Install shims (14) between cover (12) and the axle housing.

Caterpillar Information System:

768C TRACTOR & 769C TRUCK POWER TRAIN Rear Axle Housing
768C TRACTOR & 769C TRUCK POWER TRAIN Final Drive 6D1520
768C TRACTOR & 769C TRUCK POWER TRAIN Rotary Actuator
768C TRACTOR & 769C TRUCK POWER TRAIN Selector Group 7G1365
768C TRACTOR & 769C TRUCK POWER TRAIN Pressure Control Group 7G1366
768C TRACTOR & 769C TRUCK POWER TRAIN Transmission Hydraulic Control Group 7G1362
768C TRACTOR & 769C TRUCK POWER TRAIN Lockup Clutch And Solenoid Valve Group 6T3722
768C TRACTOR & 769C TRUCK POWER TRAIN Outlet Relief Valve For The Torque Converter 8P1471
768C TRACTOR & 769C TRUCK POWER TRAIN Inlet Relief Valve For The Torque Converter 3P348
768C TRACTOR & 769C TRUCK POWER TRAIN Parking Brake Release Valve
768C TRACTOR & 769C TRUCK POWER TRAIN Oil Cooler Relief Valve For Torque Converter And Brakes 8J2380
768C TRACTOR & 769C TRUCK POWER TRAIN Engine Support Group 4N7729
768C TRACTOR & 769C TRUCK POWER TRAIN Rear Wheel Group
768C TRACTOR & 769C TRUCK POWER TRAIN Adjustment Of The Rear Wheel Bearings
768C TRACTOR & 769C TRUCK POWER TRAIN Rear Wheel Brake Group
768C TRACTOR & 769C TRUCK POWER TRAIN Tire Valve 4D2004
768C TRACTOR & 769C TRUCK POWER TRAIN Pressures And Shift Points For Torque Converter And Transmission
768C TRACTOR & 769C TRUCK POWER TRAIN SYSTEM OPERATION
768C TRACTOR & 769C TRUCK POWER TRAIN Testing And Adjusting
768C TRACTOR & 769C TRUCK POWER TRAIN Body Retaining Pins
768C TRACTOR & 769C TRUCK POWER TRAIN Body Support (FT1437)
768C TRACTOR & 769C TRUCK POWER TRAIN Rear Tires And Rims
768C TRACTOR & 769C TRUCK POWER TRAIN Axles (Rear)
768C TRACTOR & 769C TRUCK POWER TRAIN Final Drives
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