720 1st reduction gear

mrbgpetersen · Nov 21, 2014

can someone tell me if the oil in the 1st reduction gear is shared with the transmission oil?

carpenter · Nov 21, 2014

Yes, yes it is. There is a drain hole in the reduction reservoir into the main case. Might be goobered up, but its there on my 730. At least as I remember. It is filled by the main gear lifting lube up there. I think.

Maybe we better get a more expert opinion.

mrbgpetersen · Nov 21, 2014

yeah why not just put an extra 1 1/ 2 quarts in the transmission? please help!

mrbgpetersen · Nov 21, 2014

one reason im asking is when ive drained them there has never seemed to be much come out!

James Howell · Nov 22, 2014

Take a look at the diagram below.

Note the plug (Key 7) and the high strength cap screw (Key 32).

Take a look at the photo below.

Take a look at the photo below.

The service manual recommends 90W for above 0<sup>o</sup> F and 80W for below 0<sup>o</sup> F.

The service manual states "[b:654c4848f0][i:654c4848f0]Be sure to refill the first reduction gear cover, also.[/i:654c4848f0][/b:654c4848f0]".

The service manual also states "[b:654c4848f0][i:654c4848f0]The first reduction gear cover holds 1 1/2 U.S. quarts.[/i:654c4848f0][/b:654c4848f0]"

Hope this helps.

buickanddeere · Nov 22, 2014

All that info and much much more is in the operator's manual. As somebody has up and lost the manual you need one. The good news is that the nice folks at 1-800-522-7448 have real JD operator's and service manuals on CD and hard copy. The parts book is on the JD web site.

David G · Nov 22, 2014

On many cases with common drain backs, the drain back is a little higher than the drain. This causes an oil level to be maintained. The purpose of pre-filling is so that there is a level in there for starting.

Mike M · Nov 22, 2014

It can transfer back and forth but is very limited to just the gaps around the shafts and bearings. When draining and refilling the transmission always drain and refill the reduction cover too as to make sure the old is out and the new is in there from the start.
Same with the diesel engine timing cover drain it at an oil change but it will fill up upon adding enough oil into the engine.

Kemper · Nov 22, 2014

You sound like a broken record ^^^^

buickanddeere · Nov 22, 2014

You should telling the people asking for information that is in the operators manual that they sound like a broken record.

Kemper · Nov 22, 2014

Who cares if they are asking for info, there's no rules that say not to, are you trying to run people of the site or what is your deal?

If you don't like questions then move on...

mrbgpetersen · Nov 22, 2014

tell me what page in the owners manual it says anything about the 1st reduction gear and the transmission are joined together. the reason i was questioning was everytime i have drained the 1st reduction gear oil on many tractors not much comes out.

mrbgpetersen · Nov 22, 2014

Hey Buick, I have an owners manual and a service
manual and cant find where it addresses my
question. I may not be the sharpest knife in the
drawer but i can read!

James Howell · Nov 22, 2014

Not sure what happened to the photos above; all three displayed when the reply was posted.

Here they are again if anyone is interested.

buickanddeere · Nov 23, 2014

My 70 diesel operator's manual is at Mom & Dad's with the 70 but if you want the info from the 840 manual I can quote that for you.

mrbgpetersen · Nov 23, 2014

hey Mike thanks for your reply! Could you further explain the timing cover drain for the engine oil?

Mike M · Nov 23, 2014

Many people don't know or forget to remove the timing cover drain plug on bottom of LH cover on engine should be below flywheel area somewhere ?
There is also the main drain plug in the center of the bottom of the main case by oil filter cover ? It holds a lot in there. It will refill thru a hole inside the case as you fill up the engine. Just give it a little extra time to settle in.

mrbgpetersen · Nov 23, 2014

Hey mike is it that drain plug under the flywheel next to the hydraulic pump? That is very neat to know as i had never read or heard of draining that before!

James Howell · Nov 23, 2014

I agree 100% with your statement "[i:654c4848f0]i have drained the 1st reduction gear oil on many tractors not much comes out[/i:654c4848f0]."

We have four Model 70s and that has been my same experience with each one.

Reviewed all four of our "[i:654c4848f0]real JD operator's manuals[/i:654c4848f0]" and one "[i:654c4848f0]real JD service manual[/i:654c4848f0]" for the Model 70.

Have not been successful locating "[i:654c4848f0]what page in the owners manual it says anything about the 1st reduction gear and the transmission are joined together[/i:654c4848f0]."

Take a look at the photos below of the Operator's Manuals.

Basically the information is exactly the same in all four Operator's Manuals, but just located on different pages.

Just to be clear and safe on this question, take a look at the photos below of the Service Manual.

Basically the exact information in all four Operator's Manuals.

These examples provide some very good evidence that not all of our questions can be answered by information in an operator's manual.

Hope this helps.

James Howell · Nov 23, 2014

Take a look at the photo below of the timing gear housing drain plug on "Big John" our 55 Model 70 diesel.

Hope this helps.

mrbgpetersen · Nov 23, 2014

Thanks for your support!

mrbgpetersen · Nov 23, 2014

Again many, many thanks to most of you! I have truly learned some very valuable information that I could not find answers to elsewhere!

gtx1967jewison · Nov 23, 2014

Because nobody put any in the last time! Fill it per the service manual. Changing oil classifies as SERVICE therefore get the manual. OR ruin the machine- most guys go the ruin machine route cuz they figure they're smarter than the 60 yr old machine. Then it ends up sold to the next smart guy or scrapped. SMH

720 1st reduction gear

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