H3.50XL H4.00XL-5 H4.00XL-6 H4.50XL H5.00XL [F005]
This section has the description and the repair proce-
dures for the speed reducer and differential.
DESCRIPTION (See FIGURE 1.)
The speed reducer and differential are installed in a
common housing as an assembly. The speed reducer is a
single stage reducer with a small drive gear and a large
driven gear. The speed reducer transfers power between
the powershift transmission and the ring and pinion
gears. It decreases the revolutions per minute between
the engine and the drive axle.
The ring and pinion set of gears is also a single stage
speed reducer. The ring and pinion gears transfer the
power to the drive axles and drive wheels.
The differential assembly is fastened to the ring gear.
The ends of the axle shafts have splines that fit into the
differential side gears.
The speed reducer and differential are in the same hous-
ing. The normal procedure is to remove the complete
drive axle and speed reducer as an assembly from the lift
1. Remove the carriage and mast assembly as described
in the section THE MAST, 4000 SRM 340.
2. Disconnect the brake lines at the wheel cylinders.
3. Remove the parking brake lever from the cowl. Re-
move the clamps for the parking brake cables at the
4. Put blocks on both sides (front and back) of the steer-
ing tires so that the lift truck can not move. Connect a
lifting device to the front of the frame. Put a floor jack
under the speed reducer to hold the drive axle assembly
in position. Remove the four large capscrews that hold
the drive axle assembly to the frame. These capscrews
are tightened to 1000 N.m (740 lbf ft). See FIGURE 2.
5. Raise the lift truck frame. Make sure the parking
brake cables that are still attached to the drive axle as-
sembly move freely. Make sure the output yoke for the
drive shaft slides out of the transmission. Remove the
drive axle assembly from under the lift truck.