JD300 motor project

thanks to all the great help and comments i got here when i started this project a little while back i have gotten it kind of stripped down. now just trying to get it clean enough to see if i can get a little fresh paint on it before re-assembly begins.

i have found a rebuilt short block and had the head rebuilt at a local machine shop but before we get to that point.

i did not get to use this machine only to start the motor and hear it banging loudly, the rod bearing on the crank shaft for center cylinder was completely gone, no parts found in oil pan.

i will be inspecting with my limited knowledge all components looking for obvious issues. maybe i should consider a clutch and brakes while i'm where i'm at? rebuild hydraulic pump?

anyone with more knowledge of these things, i would be very grateful for any comments or suggestions on what to look for / at while i'm cleaning and painting? i already see some funny look pin holes at some hydraulic ram connections. but i think at this point i'm most concerned with mechanicals.

thanks much

Looks like your machine has a reverser transmission. Be wise to rebuild the clutch packs unless you know for certain they are ok. I brought a 301A scrap pile back from the land of the dead and didn't check it's clutches. Wished I had. The biggest issue I had with the 301A was the hydraulics. It was only a stroke of luck that I finally found the problem with it.

You guys and those cement block just make me cringe with what could happen while under there. Especially those under the hoe bucket. the one in the fore ground should have a wood block that covers the whole cement block then jack block on that. half blocks are so unstable when the other half breaks/ crushes off from it.

As Caterpillar Guy indicates, replace the cement blocks with wood. I lost a friend (and principle of the school where I taught)to concrete blocks used to hold up his Delta 88. He was smashed under it for more than an hour, but was dead immediately. They are very weak porous. It will take an hour or two, but life can't be put back inside a person smashed. Even just having the tractor fall is bad enough. Please!! Jim

(quoted from post at 16:02:07 06/23/23) Looks like your machine has a reverser transmission. Be wise to rebuild the clutch packs unless you know for certain they are ok. I brought a 301A scrap pile back from the land of the dead and didn't check it's clutches. Wished I had. The biggest issue I had with the 301A was the hydraulics. It was only a stroke of luck that I finally found the problem with it.

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i have not taken the block out yet (to protect the clutch housing area until after cleaning). my documentation (PC-972) shows only one 'Clutch Disconnect and Flywheel (with reverser)' all others say 'without reverser' except for one that says ' with continuous driven pto'. this tractor does not have a pto in the back like a farm tractor but the hydraulic pump turns when the motor runs and is driven off front of motor.

just to get it thru my dense head, the 'clutch packs' you are referring to are the ones between the motor and transmission?

the clutch disks are listed as; AT21669 , AT24059

and I'm thinking i want to check and make sure the brakes are in good order also ....

and yes i agree with those worried about the jacking and cribbing. i would not get under there or send anyone else under there the way it is. it is only set for cleaning and will be properly supported after cleaning to actually work on it, however neither of the two 20 ton jacks that are actually holding it up showed up in the pictures

'with / without reverser' knowing nothing about this terminology does that mean some of these tractors were built with a reverse capability?

Was going by the control rod on the right side of the transmission. This is an image of a 300B parts list if it is any help.

(quoted from post at 07:22:03 06/26/23) Was going by the control rod on the right side of the transmission. This is an image of a 300B parts list if it is any help.
<img src=https://www.yesterdaystractors.com/cvphotos/cvphoto157279.jpg>

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i'm back to work on my project and of course that means more questions. i have the clutch and pressure plate out, the throw out bearing and carrier were in many pieces, new parts ordered and in the mail. looking at the 'clutch disconnect and flywheel' parts diagram (pg 35-7) i'm thinking part 10 - T22177 support - is where part 13 - R39084 shaft - comes out through the hole in the center to engage the clutch. (the diagram with your reply from earlier) the parts you recommended checking out are behind the aluminum support part 10 - T22177?

And if that's true then the support (part 10) has to come out for inspection, however the shaft with the fork is in the way, it can not come out because of the front loader frame being in the way. my book shows part 19 - AT20056 maybe as a 2 part shaft? but mine is not, i filed all the dirt and paint off looking for some kind of split line but i appears to me to be a solid shaft? i did a quick 2 min search for AT20056 and AT27717 to see maybe what the part looked like but didn't find anything that looked like the part.

i know it's long but i like to describe best i can the exact condition so as to try and help the teacher understand my problems.

thanks
bob