190303Ga Flashcards
Brake band friction material is inspected for?
Burrs, embedded metal particles, severely pitted material, cracks/distortion and flaking.
Brake drums may be reused if there is blue colouring and flaking. T/F
False. Heat checking can lead to failure. So can a large amount of wear, distortion and signs of over heating.
Wear, scratches, nicks and scoring should be checked for on this component?
Piston sealing surfaces.
All disks; friction, clutch and brake, must have 2 tools to be able to measure for what?
Flat surface and feeler gauges to measure for wear, warpage and coning.
Manufacturers recommended procedures will only have scattered information regarding component. T/F
False. Manufacturers recommended procedures will have exact assembly instructions and specifications.
What are 2 ways to check steering and brake clutches during disassembly/assembly?
Feeler gauges and stack height.
Improper clearance in steering and brake discs will cause what to happen?
The discs will drag resulting in over heating. Failure is imminent.
As it is apart anyway, a check on this component should be done.
Bevel gear and shaft.
The service manual will give proper adjustments for these important input devices.
Steering clutch and brake linkages.
In a non-modular track steering machine, the brake valve regulates ____ to the brakes.
Pressure
Like the steering valve, the brake valve regulates pressure in accordance with ____ ____ ____ movement.
Steering control lever
On a machine that is equipped with a steering clutch 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 clutchesand brakes by applying the brakes T/F
false;
Applying the track brake and disengaging the same side clutch on a machineequipped with steering clutches and brakes will cause the machine to:
perform a sharp turn.
Steering clutches and brakes are released with the steering control levers in theirnormal position. T/F
false
Clutch is engaged and brakes are released
List two (2) common brake types used in steering clutch and brake equippedmachines.
a) band-type brakesb) multiple-disc, oil bath brakes
Many modern crawler tractors are equipped with modularized steering clutch andbrake assemblies. On these units, the:
brakes and clutches are spring applied.
A priority valve is often used when the transmission charging pump is used to supplysteering clutch and brake control system. The function of the priority valve is to:
Ensure that oil flow from the transmission charging pump satisfies the needs of thesteering clutch and brake control system before allowing oil to flow to thetransmission or torque converter.
Caution must be taken when disassembling crawler tractor brake assemblies becausethey contain:
very strong springs
List four (4) friction disc faults that should be noted when performing a visual inspection
a) burrsb) embedded metal particlesc) severely pitted friction materiald) cracks and distortion
A flat surface and a set of feeler gauges are required when checking clutch and brakediscs for
warpage and cone.
If steering clutch and brake linkages are out of adjustment, the clutches and brakesmay not fully apply or release.T/F
true
What are 5 visual inspections you should make
1) Power train oil level and condition
2) Leakage
3) Control linkage condition and adjustment
4) Condition and adjustment of tracks
5) Check filters
What are you looking for while inspecting the control linkages
Inspect for bent or damaged components, ensure that the linkage operates smoothly with no binding and that the linkage is correctly adjusted.
Why is it important to warm the the steering system to operating temp.?
Steering system leakage increased significantly as the oil temp increases. Normal operating temp. Is between 65.5C (150F) and 82.2C (180F)
If you have a slipping brake what will be the result during a stall test?
Creeping forward or veering to the left or right.
What is a sign of slipping steering clutches in a stall test
Stall speed that is higher than specification in all transmission ranges.
Non-modularized brake systems use what type of brake?
The brake is a wet contracting band type
In a non-modularize brake and steering clutch when is the brake applied?
When the steering control lever is pulled out all the way
The friction material in a brake band must be inspected for burrs, embedded metal particles,pitted friction material, cracks, distortion and flaking friction material.
If any faults are found what must be done?
The brake bands must be re-lined or replaced
Brake drums should be inspected for what?
Cracks and heat checks, wear and distortion, and overheating
What are two ways to check clutch and brake disc clearances?
Stack height checks or by using feeler gauges.
What’s another name for a bevel gear shaft?
The cross shaft
True or false. Brake linkage adjustments are made after the clearances adjusted between the brake band and drum
True. Tighten the band all the way, back off one and a half turns. Then make any necessary brake linkage adjustments
Pressure gauge reading should be done at what rpm?
Low idle and high idle
A pressure gauge installed before braking circuit should read?
0 when not applied. As lever is pulled smooth engagement to max pressure
Cooler bypass valve opens when?
Excessive restriction in cooler is found. As a result lube circuit starvation occurs
On a unit equipped with steering clutches engine power is transmitted through the transmission and split equally between the left and right tracks. (T/F)
True.
