As previously mentioned, it is often necessary to provide a road speed, so the machine can be moved on the highway between job sites. (Generally,…
Author: Jack
Wheel motors, mounted at both rear wheels (Fig. 6.12), is a variation of the configuration shown in Fig. 6.11. This arrangement eliminates the universal joint…
A hydrostatic transmission provides improved maneuverability, but at a cost. The efficiency of a hydrostatic transmission is always lower than a discrete-gear transmission. A discrete-gear…
The same vehicle shown in Fig. 6.1 is shown in Fig. 6.11 with the mechanical transmission replaced with a hydrostatic transmission; all other components remain…
A hydrostatic transmission (HST) is simply a pump and motor connected in a circuit. Other components are added to obtain certain operating features. The four…
Performance of a direct-drive transmission with six shifts (six gears) is compared to a torque converter/automatic transmission with three shifts in Fig. 6.9. Note that…
A vehicle with rear-wheel drive has the components shown in Fig. 6.1. For purposes of discussion, we assume that the mechanical transmission has four gear…
Pump mounts are gearboxes that are designed to power hydraulic pumps. These gearboxes have one input and provisions for mounting one to four pumps on…
The multiple pump design places two or more pumps in the same housing and drives them with a single input shaft. Sometimes, only one inlet…
The Vickers Model 25V (T) vane pump has a displacement (cam ring fixed for maximum displacement) of 4.81 in3/rev. The specifications are: Maximum speed 1800…