1
Before removing a component from a hydrostatic drive system, what must be done first?
Relieve the system hydraulic pressure.
What occurs in a variable-displacement pump when the swashplate angle is increased?
More oil is displaced per stroke.
What function does the main relief valve serve in a hydrostatic drive circuit?
Protects against excessive pressure spikes
What component is the rotor mounted to in a rear-mounted hydraulic retarder?
Output shaft.
What occurs in a hydrostatic drive system when the load on the motor decreases?
The pressure in the system decreases.
What occurs when the swashplate is moved to the maximum angle for maximum torque?
High Speed operation.
What occurs in a variable-displacement pump when the pistons and barrel rotate with the valve plate at an angle?
Piston will stroke.
What occurs to the pressure in the drive system in a hydrostatic drive when the load on the motor increases?
Drive pressure in the system increases.
What is the maximum potential torque available at start-up on a hydrostatic drive loader?
90%
What is the main design feature difference between a closed-loop system and an open-loop system?
The return oil from the motor goes directly back to the pump on the closed loop system.
Because a small pin hole can cut you or cause serious damage if sprayed in your eyes what would be the safest way to find a pin hole in the hydraulic system?
Use a piece of cardboard
Which component directs the low-pressure side of the drive loop to the low-pressure charge relief valve?
Shuttle valve
What controls the direction and the amount the swashplate moves?
Servo piston
What determines the degree of braking in a hydraulic retarder?
Oil flow and pressure
Which statement best describes hydrostatic drive system operation?
Low flow velocity with high pressure.
What occurs in a variable-displacement pump when the pistons and barrel rotate with the valve plate at an angle?
Piston will stroke.
Which component determines the rate and direction of flow inside a variable-displacement motor?
Swashplate.
Which system is capable of offering independent track control and infinite variable speed control?
Hydrostatic drive
Where does the oil enter the hydraulic retarder during retarder operation?
Near the center of the rotor.
Which component supplies makeup oil in a hydrostatic drive system?
Charge pump