1
Tandem drives are a completely seal unit to prevent the environment from getting in, but still need to use a breather. A breather is installed to prevent the build up of internal pressure.
True or False
True
Chain drives
How is the torque transferred in road graders?
Diesel fuel
During a tandem drive oil change what is used to remove the sludge build up?
To have one quarter inch of slack for every foot between shaft centers.
What is a good rule for chain tension?
To get the proper preload on the bearing
Why are there two different measurements for tightening the bearing nuts?
Reducing speed and stress, and increasing the available torque at the drive wheels.
Why would you drop the power flow to the ground?
Mixing of lubrications may cause what?
Accelerated breakdown of the additives used in the oil.
Tapered rollers bearings
In double reduction final drive what supports the drive pinion?
15
How many steps are there in the book to adjust the bearing on the final drive?
To increase torque and decrease speed.
What is the main purpose of the final drive?
Pinion drives, bull-type final drive, double reduction, and planetary
What are the Construction features of the final drive?
Pinion drives
What is the most common construction used on off-road equipment?
Bull type final drive.
What is the most common construction used on tracked vehicles?
Lubrication failure, shock load, fatigue failure
What are the common failures to final drives?
3:1
What is the lowest gearing used in final drives?
Can transmit more torque.
With the reduction in size of a planetary final drive what else is the benefit of this design?
3%
What is the maximum of elongation that is considered normal?
100 lb-ft
What is the final torque spec for a final drive group of 8W-4368?
125 lb-ft
What is the adjusting nut torque for final drive group 194-6773?
Has two separate but aligned gear reductions.
What does double reduction drive mean?
12:1
What is the highest gearing used in final drives?
Equipment
What is the last word on page 477?
Replace both sides
When replacing a chain drive in a tandem housing what should you always do?
Remove the outer cover, and store the cover and bolts in a secure location.
What is step 7 when final drive bearing adjustment?
Bull-type final drive.
Single gear reduction is often called what?