Section 11 190303 Flashcards
On a and brake type steering system, power is delivered to the final drives through the ______________________
steering clutches.
A gradual turn is accomplished on a tracked machine equipped with steering clutches and brakes by _________________________
Disengaging one steering clutch
Applying the track brake and disengaging the same side clutch on a machine equipped with steering clutches and brakes will cause the machine to:
perform a sharp turn.
Steering clutches are ____________ and brakes are released with the steering control levers in their normal position.
engaged
List two (2) common brake types used in steering clutch and brake equipped machines.
1.band-type brakes
2. Multiple-disc, oil bath brakes
Many modern crawler tractors are equipped with modularized steering clutch and
brake assemblies. On these units, the brakes and clutches are ________ applied.
spring
A priority valve is often used when the transmission charging pump is used to supply steering clutch and brake control system. What is the function of the priority valve?
Ensure that oil flow from the transmission charging pump satisfies the needs of the steering clutch and brake control system before allowing oil to flow to the transmission or torque converter.
Caution must be taken when disassembling crawler tractor brake assemblies because they contain:
very strong springs.
List four (4) friction disc faults that should be noted when performing a visual inspection.
Any four (4) of the following are correct.
a) burrs
b) embedded metal particles
c) severely pitted friction material
d) cracks and distortion
e) flaking friction material
f) damaged spline teeth
A _______________ and _________ are required when checking clutch and brake discs for warpage and cone.
flat surface and a set of feeler gauges
If steering clutch and brake linkages are out of adjustment, the clutches and brakes may ___________________________
not fully apply or release.
List three (3) advantages that a hydrostatic steering system offers over a steering clutch and brake system.
- Power is applied to both tracks when the tractor is being turned.
- Infinitely variable track speed and the ability to counter-rotate the machine makes the machine more maneuverable.
- Infinite speed control allows machine ground speed to be adjusted to provide optimum traction.
What is the function of the flushing valve on a motor of a hydrostatic steering system?
provide more efficient cooling for closed circuit components.
How does the ECU of an electronically controlled dual path hydrostatic steering system monitor machine tracking?
It monitors machine tracking by monitoring feedback signals from speed sensors mounted on the right and left track motors.
What is the function of the speed sensor that monitors pump speed?
Provide the system ECU with a feedback signal proportional to engine speed. This signal allows the ECU to reduce machine speed when the engine rpm falls below the point where the engine can handle the load.
