Tracked Equipment Steering Flashcards
Non-modularized crawler
Steering clutches were spring applied, hydraulically released and brakes were hydraulically applied spring release
Non-modularized brakes
Band with lining material is wrapped around the steering clutch assembly. Band is pulled away by spring and pull onto drum by hydraulic pressure
Steering clutches
Spring applied and hydraulically released. Multi disc clutch pack with usually more discs than trans due to torque increase
Crawler cross shaft
Generally bolted solid to the bevel crown gear. This results in the machine stopping if only one brake is applied (as long as that clutch is engaged)
Non-modularized brake are?
A self energizing brake
What is normal operating temperature for a trans
150 - 180 F
If steering clutches are slipping this will be indicated by a _____ stall speed
Higher then specified in all speed ranges
2 common brake types used in steering clutch and brake equipped machines
Band type
Multiple disc, oil bath brakes
What are the 2 rules about bi-directional hydrostatic motors
Can never go to 0 degrees
Can never go over center
What are 3 advantages of hydrostatic steering over clutch and brake (ILM)
Power is applied to both tracks when turning
Infinitely variable track speed, and counter rotation make it more manoeuverable
Infinite speed control, means ground speed can be adjusted for optimum traction
What component limits pressure in charge circuit of HSS
Neutral charge relief
What are 3 functions of the charge circuit in the HSS
Control circuit (pilot) Replenish closed loop leaked oil Supercharge main piston pump inlet
What is the function of the flushing valve on the HSS
Provide more efficient cooling for closed circuit components
The ECU of an electronically controlled dual path HSS monitors machine tracking by
Monitoring feedback signals from speed sensors mounted on the right and left track motors
