Motor Grader manual question

The 8T preceded the 70D & 71D models. All the info in the 8T manual would pretty much be the same except there is nothing about the oil clutch which some/all the 70D's had. May even be a case of the 8T Servicemens Reference Book form #30124-3 is all that is available as I did a search on the Cat Legendary Literature site http://www.cat.com/cda/layout?m=90800&x=7 and could not find a service manual for the 70D. They do have parts manuals and owners manuals for the 70D.

Thanks for the information!

I don't thinks I need to worry about the clutch, I need to get the poney motor going first (no spark out of the mag) and then move onto the diesel. Suposedly this grader had problems with the carb on the poney motor when parked 5 years ago, but the fuel line and bowl where pretty much plugged and that could have been problem.
Since I not familar will road graders or large Cats, is there a way to tell if this grader has a oil clutch?

Again, thank for the replies!

Charles

Look for a dip stick and fill plug on the clutch housing, also an external cast housing connection from the clutch housing going to the engine on the LH side. The oil clutch uses a added section to the engine oil pump as scavenge pump for oil circulation to the clutch.

Techieguy,

I have owned a 70D and currently have a 71D, which is the direct electric start version. I have never seen an oil clutch on any of these units. They have a drive shaft that drives the clutch and an inner shaft that drives the mechanical controls. I have manuals for the 8T and 70D versions and they are not very different. The 8T had the starting engine controls on the side like dozers and the 70D has a linkage system so that the starting engine could be run from the operators seat. I also have the serviceman's reference books so I might be able to find what you need.

Thanks again... I just got home from work and will check the what OldMagnet has said!

D4Doug,
I do remember a plate being on the LH side of the motor for an electric starter...And it does have the starter controls on the LH side of the operators compartment.

Thanks to all for all the answered question thus far! You guys are great! Hopefully I gain enough knowledge with this I coul pass some along to another novice... I won't ever be as some of you, after reading some of the post here... What a wealth of knowledge!

Thanks

Techieguy

Hi D4Doug,
Does any of the literature you have cover the oil clutch???
Was just looking at a unit with oil clutch a couple of weeks ago. Would have pictures too, as it was a curious arrangement but the dummy forgot to bring the disk for the camera. Oh well, maybe I'll get a chance to go back for another take.

I just checked the grader and I didn't see and oil fill or dipstick around the clutch housing. So I assuming I should purchase the manual that cover the 8T. Even if its not exact, it should be close enough for getting the beast started and running.

Thanks again!

The in-seat starting system is likely to be a little different than the older 2 lever controls on the side of the engine, but the principal would be the same..

Make sure transmission is in neutral and brake is on
Decompress the main engine, close throttle to shutoff position

Start the pony motor, warm it up and rev it up

brake the pinion/quickly engage the pinion gear with the flywheel ring gear

engage the pinion clutch to turn the main engine

apply compression to warm the main engine and get the oil pressure up for a minute or longer if needed in cold temperatures

open throttle to start, If it doesn't fire up, close throttle again and let it warm up some more being turned with the pony motor.

It should make white smoke whenever the throttle is open if it getting fuel to the cylinders.

Have fun

the 99E (12E) has an oil clutch that uses the engine oil supply and a scavenge pump to supply the clutch. No rear main seal even. There are some sealing rings on the flywheel to seal the oil going from the clutch housing oil passages into the clutch. Still have to get ours back together.