suspension systems Flashcards
suspension systems must
have a specific carry capacity .in relation absorb and transit torque to the vehicle frame . provide cushion effect . position axle assembly accurately to the drive line . allow axle assembly movement during operation . allow each axle of a tandem or tri tandem unit to move independently of each other
the tractor scraper is a unit that was designed to carry material a distance of
100 to 1000 meters
a tractor scraper is a two section machine that consist of
a front tractor section that includes the operators compartment and a rear bowl section
what does the hitch assembly allow the tractor scraper to do
articulate . as well as tilt slightly side to side
what is a stiffneck hitch
does not allow any vertical movement in a the hitch
cushion hitch hydraulic load cylinder uses what to control vertical movement in a scraper
hydraulic action in combination with compressed nitrogen gas from the accumulators
are the cushion hitch type suspension systems adjustable
yes the operator can control the cushioning effect by engaging the cushion control
the articulated haul truck was designed to haul material how far
300 to 2000 meters
smaller haul trucks use what type of suspension
rubber block type suspension
larger haul trucks use what type of suspension
hydropneumatic type suspension
large haul trucks with only one axle use what to keep the drive axle housing centered left to right
a pan hard rod
regardless of the type of suspension system they all must control
excessive vertical movement over rough terrain
when a cushion hitch is locked down to allow for a flatter grade and is not returned to cushion when hauling dirt
the scraper can develop a loping motion
the cushion hitch hydraulic system with exception of the hydraulic reservoir is
completely separate from the rest of the machines hydraulic system
a single engine tractor scraper has only what two positions for the cushion hitch
lockdown - cushion ride
if a twin engine tractor scraper has a push pull (bail system ) what are the control lever positions
bail down , lockdown ( for push pull loading rear machine or parking ) bail up , lockdown ( push dozer loading , lead unit or finishing cushion ride ( traveling )
what is the purpose of the leveling valve is the cushion hitch system
stops oil flow to accumulator and cylinder once leaf spring and yoke reach proper ride height
how long must the engine be shut off to allow accumulators to bleed down
five minutes
why must you pour hydraulic oil into a new accumulator cylinder then run the unit before filling with nitrogen
to purge the air from the accumulator
dry nitrogen must be what % pure
99.8%
what do A frames provide
longitudinal support and transfer the forces created by wheel torque
what is another name for hydropnumatic suspension
strut
what limits strut twist
wear strips or wear bars
what is a payload weight sensor
a pressure sensitive sensor place in a strut to monitor nitrogen pressure in relation to the load placed on the truck
