FRAME ASSEM. 4M8418 - Caterpillar

Illustration 1 g02413020
Differential and bevel gear
Illustration 2 g02413018
Sectional view of the differential and bevel gear
(1) Yoke
(2) Bearing
(3) Bearing
(4) Bolt
(5) Lock
(6) Adjusting ring
(7) Bearing
(8) Differential group
(9) Bevel gear
(10) Shim pack
(11) Pinion
(12) Shim pack
Illustration 3 g02413022
Differential
Illustration 4 g02413019
Sectional view of differential group (8)
( 13) Side gears (two)
(14) Spider
(15) Differential bevel pinions (four)
(16) Thrust washers The power that is sent to the wheels is divided by the differential. The amount of power that is sent to each wheel is balanced by the differential. During a turn, the differential allows the inner wheel to rotate at a slower rate than the outer wheel. The differential still sends the same amount of torque to each wheel.The differential and bevel gear is fastened to the rear axle housing. The differential and bevel gear connect the output shaft of the transmission to the drive axles. Bevel pinion (11) turns bevel gear (9). Bevel gear (9) is fastened to differential group (8). There are four differential bevel pinions (15). Differential bevel pinions (15) turn freely on spider (14). Each differential bevel pinion (15) has a double bearing assembly in order to carry the drive load of the differential bevel pinion. The two sections of differential group (8) are bolted together in order to hold spider (14). The two sections of differential group (8) rotate together with bevel gear (9). The housings are driven by bevel gear (9). The housings are supported by the bearings.Differential bevel pinions (15) are engaged at a 90 degree angle with two straight side gears (13). The side gears are connected to the drive axles by splines.When the machine is moving in a straight direction and each drive wheel has the same traction, both wheels receive the same load. The same amount of torque is felt on each axle. This torque holds differential bevel pinions (15) so that the differential bevel pinions do not turn on spider (14). This torque provides the same effect as if both drive wheels are fastened to the same drive axle.When different loads are on the drive wheels, differential bevel pinions (15) will turn because the forces are different on opposite sides of the differential. During a turn, the rotation of the differential bevel pinions will allow slower rotation of the inside wheel and faster rotation of the outside wheel. The machine is driven with full power in a turn.Side gears (13) turn against thrust washers (16). The end thrust of the differential bevel pinions (15) against the differential case is taken by a double bearing assembly.Note: The bearing assemblies must be changed in sets of two.Adjusting rings (6), lock (5), and bolts (4) are used to make an adjustment between bevel pinion (11) and bevel gear (9). The adjusting rings are also used to adjust the bearing preload of bearings (7).The differential receives lubrication from the oil in the rear axle housing. As the parts rotate, the oil is dispersed around the inside of the housing. Spiral grooves in thrust washers (16) allow the lubricant to flow between the thrust