RD 16 Repair 4 4.1
Drive System
Drive System Drive System Overview
Background
The hydraulic system is powered by two pumps (exciter and drive) mounted in tandem—connected along their shafts through a solid-mounted coupling—and driven directly by the engine crankshaft through a flex coupling.
Drive pump
Drive motors
System filters and strainers
Troubleshooting sequence
The drive pump is a variable displacement, axial piston pump and includes an integral charge pump. Flow through the drive pump is controlled by varying its displacement through the movement of the control lever coupled to the pump’s control shaft. This allows a full range of operating speeds in both forward and reverse. There are two drive motors—one mounted to each drum. The drive motors are plumbed in series. Each drive motor is equipped with Spring Activated Hydraulically Released (SAHR) brake. The hydraulic tank is equipped with a strainer at the fill port to trap large objects or particles which may accidentally fall into the tank while adding hydraulic fluid. Additional system protection is provided by a suction filter mounted in-line with the exciter pump inlet. The hydraulic system is protected by a return-line filter which removes dirt particles down to 10 microns and includes a flow bypass for cold weather start-up.
When troubleshooting drive system problems, do so in the following sequence: 1. Check the function of the drive control cable. 2. Check the brake release solenoid valve. 3. Pressure test the drive pump and relief valve. 4. Check the drive motors.
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