SUBSECTION 9B
PROPEL TRANSMISSION
GENERAL
The description and troubleshooting of the electronic propel
control system is covered in Subsection 10C.
The propel transmission includes the hydraulic compo-
nents used to propel the machine. The components-include
DESCRIPTION
the propel pumps, motors, controls, filters, heat exchanger
GENERAL
and reservoir. The pumps, controls, filters, heat exchanger
and propel reservoir are located at the left rear of the upper.
Each propel hydrostatic transmission consists of a variable
The propel motors are mounted on the propel brakes at the
displacement pump connected to a fixed displacement
rear of the crawler frames. An independent pump and
motor (see Figure 9B-1). The pumps rotate in one direction
motor is provided for each side of the machine.
only, whereas the motors rotate in either direction.
This subsection covers the description, maintenance, start-
The main ports of the pumps are connected by hydraulic
up, troubleshooting and repair of the propel transmission.
lines to the main ports of the motors. Fluid flows, in either
Figure 9B-1. Propel Transmission with Gauges
