1953 Allis Chalmers WD 45 PTO gearbox

Jeff Kinnett

New User
purchased a WD 45 with a temporary plate over the PTO gearbox need to know if I take that temporary plate off will oil spill out everywhere
ready to restore PTO gearbox, is there a fill plug to add oil for the PTO gearbox or does it get it somewhere else.
my AC shop manual and
owners manual does not explain
 
There is supposed to be the drain plug for that part of the tractor at the bottom of the PTO gear box, so yeah there is oil right behind that plate.

The fill holes are located inside the frame on left hand, carb side, of the tractor. The plugs in the holes have a square head on them. One is large and the other small with the larger one being closer to the rear of the tractor.
 
so 5 gallon bucket under the temporary plate when I take it off to capture oil that comes out, now my shop and service manual show filler plugs but none for the PTO gearbox you said it's inside the frame, if I'm standing in front of the carburetor is fill plug for pto around this area
 
Jeff, if you want to get most of the oil out before taking the block off plate off you can pull the plug for the belt pulley off the right hand side and pull most if not all the oil out from there be careful and have a bucket under it as there is probably some oil behind the plug.

Leonard
 
The pto transmission and rear diff all share the same oil , so yes there is no fill plug for just the pto. By the clutch pedal inside the frame rail there are two square headed plugs they both need to be filled with oil to fill all the areas.the pto is the lowest point of that oil cavity. I think the belt pulley plug is different.
 
so Leonard if you can help explain this I've had a very difficult time understanding this, I'm a first tractor owner, my owners manual tells me that for the transmission, differential and clutch shares all the same oil = 17 quarts 3 drain plugs bottom of tractor, two fill plugs beside the hydraulic filler for these 3.
Now speakinging with several tractor owners and the seller of my tractor I have not gotten a clear answer for me if the PTO uses its own oil or shares tranmission oil, and how to fill it. Pto has drain plug
Thank you for tip on the belt pulley I will look at that next chance I get it doesn't have a belt pulley but I know I saw a plug on it
any help from you would be greatly appreciated
 
Bg/mo, huge help thank you so much that's the answer I been waiting for that it does share the oil of diff.,tranny,clutch. so the plate bolted on the bottom of the tractor where the PTO gearbox should be, if I take that off to install my PTO gearbox I restored , i will have oil gushing out. is this correct
if you answer yes then I have my information thank you so much
 
You will lose most, but not all, of the oil, as there are compartment walls separating the differential, transmission and wet clutch/PTO compartments.

Since you have the service manual, you will be aware that you need to check for condition of the intermediate gear and that the thickness/ number of gaskets between PTO box and the torque tube determine the backlash between intermediate & idler gears, which is specified at 0.004". If one gasket allows you to engage the PTO without difficulty, I'd stick with that. But, if it is really difficult, you might add another gasket.
 
Stu On, thank you so much, that really helps, i had no ideal
of compartments, i will check gaskets as you mentioned.
Thanks to all who reponded, positive and extremely helpful
info...
 
Leonard
Error! The belt pulley gear train runs in the hyd oil, completely seperate from PTO/Tran/diff.

Jeff
Hint- easiest way to get those square headed filler plugs out is to use a 12 point socket that is 1/8 in larger than the square. Eg: 3/4 sq use 7/8 12point. 1/2 sq use 5/8 12point. Then with an extension you can get ratchet above frame rail & be able to turn it easily. Beats the heck out of skinning your knuckles down inside the frame rail.
Probable the least messy to drain would be start with the trans drain. Some oil will remain in diff & PTO sections. Then go to PTO, remove 2 bolts at one end of plate, then just loosen, do not remove, the other 2 bolts, let the plate droop & guide oil into catch bucket.
HTH, Willie
 
14031.jpg


You do not want your intermediate gear looking like this. Make sure it is not one of the reasons the PTO is blanked off.[/img]
 
A very large portion of that 17 Qts of gear oil will certainly come "gushing" out when you pull that plate off.
If that plate does not have a plug screwed into it (apparently it does not) you can drain some of the oil from the other two drain plugs and finish by loosening the plate and putting a 5 gal pail under it as someone has already suggested.
It will be a little messy; don't you just hate the smell of gear oil when you get it all over yourself? LOL
As stated, check the condition of that intermediate gear in the bottom of the tranny to assure it has no teeth missing. It can, however, be replaced without splitting the tractor.
 
After I went back and read all the fine responses by the other guys, I determined that I hadn't added anything of significance! LOL
 
Leonard, you are not as far off as was stated! I just finished changing the clutch in my WD45, and opened up the belt pulley chamber. I tried to use an oil sucker to remove the oil in the chamber, and couldn't make any headway. as fast as I would empty my sucker gun, the oil would refill the chamber. I had to drain the hydraulic, tranny oil, to get the belt pulley chamber empty.
 
Jeff, on the right hand frame of the tractor is a large round plug. That is the belt pulley plug. It is a part of the hydrolic (sp) resivour (sp) that is integral to transmission/pto/rear end. The only thing is if you fill the pto/hydrolic resievour up it will drain into the rear end through the roller bearing for the splined shaft. If you have a AC service manual not an I&T it will show a lot better what I am talking about.

Leonard

PS. Wish I had my service manual here at the house and I would scan the pic's in and show you but they are at the house at the farm.
 
Ralph, You just had to get the oil level down below the level of the ball bearing seat on the shaft that transmits the engine power to the rearend through the slip clutch.

Leonard
 
Jeff, one last thing, if you pull off the battery box and unbolt and pull the domed plate that is underneath you will access the oil that is used for the pto and hydrolic (sp) system. May be easier than pulling the belt pulley plug.

Leonard

PS: don't know why I didn't think of this before.
 
14050.jpg


Jeff, if you have the AC shop manual, you will have this page. In the diagram of the engine clutch shaft, the PTO gear drives the PTO intermediate gear. The Rear Oil Seal should keep the lightwieght oil in the Hydraulic/belt pulley reservoir from mixing with the heavy oil in the wet clutch/PTO chamber. Of course, seals tend to leak after 55+ years.

The diagram of the torque housing shows that an original PTO cover would have had an oil plug in it. So, if yours is home made, make sure that your PTO drive gear and intermediate gear have their teeth.
 
Jeff, I have wondered about this for a long time.
The PTO box does go where it is indicated in you
diagram. If you go to page 55, you will see another
PTO cover shown on the bottom of the trans/diff
housing. Don't have a clue why a PTO would be
located there as it would defeat the purpose of the
hand clutch. Maybe some unusual version of the
tractor (industrial or road grader) may have used a
special purpose PTO here? Probably will never know!
 
yes if you remove that plate you will have oil, just loosen it and let it drain then install your pto, it will have a drain plug in it then ,you will need a five gallon bucket all together trany pto an differential hold just alittle less than five gal.
 

Be SURE you are going to use a PTO Gearbox for a WD-45 and NOT a WD..they are stronger..

AND, have the upper ears Magnafluxed, to be SURE they are not in any way flawed...

Ron..
 

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