WD PTO Gearbox
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=133795
Printed Date: 10 May 2025 at 2:52am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: WD PTO Gearbox
Posted By: DaveSB
Subject: WD PTO Gearbox
Date Posted: 14 Jan 2017 at 7:36pm
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I have a 1948 WD, and I suspect the PTO gearbox has a bad gear or something in it. A neighbor has a PTO gearbox from a WD45 Diesel, that I could get to put on it. Are the PTO boxes the same and interchange between a early WD and a diesel WD45? Thanks ------------- 1948 C, 1953 CA, 1948 WD, 1961 D-17 Series 2 Diesel, 1939 WC, 1957 D14 |
Replies:
Posted By: Farrell(Utah)
Date Posted: 14 Jan 2017 at 7:42pm
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No, they are not the same. The 45 diesel has a higher engine RPM so the PTO gearbox is different. Check Page 128 in the parts manual. ------------- A(1937), 2 G, 2 WD45 diesels, 6 WD45 gas, UC, 2 WD, D17 gas, WF, Farmall 400, D12, Kubota B3030 |
Posted By: SteveM C/IL
Date Posted: 14 Jan 2017 at 8:17pm
| diesel has larger gear to run it slower and hangs lower requiring the different carrier at rear |
Posted By: DaveSB
Date Posted: 15 Jan 2017 at 3:04pm
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Thanks, for the information, I thought that the Diesel PTO might be different, so I guess I will have to be on the lookout for a WD or WD45 gas PTO. They are the same aren't they? What are some signs that the PTO is starting to go bad, mine just makes a ticking sound at times and was told that I had better change it before it comes apart. Is a ticking sound a sign that its going to fail? ------------- 1948 C, 1953 CA, 1948 WD, 1961 D-17 Series 2 Diesel, 1939 WC, 1957 D14 |
Posted By: Farrell(Utah)
Date Posted: 15 Jan 2017 at 3:10pm
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The unit is the same of the WD and WD45. They are not to bad to pull off and find the reason for the sound. Parts or a replacement are readily available. ------------- A(1937), 2 G, 2 WD45 diesels, 6 WD45 gas, UC, 2 WD, D17 gas, WF, Farmall 400, D12, Kubota B3030 |
Posted By: wfmurray
Date Posted: 15 Jan 2017 at 3:17pm
| A ticking sound could be a bad ball on a bearig. |
Posted By: DaveSB
Date Posted: 15 Jan 2017 at 3:28pm
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This WD is used to run an old 50" blade sawmill to make lumber. It will power the sawmill 4 to 5 hrs at a time. It may sound perfect for an hour or 2 then it will start clicking every once in a while, not steady, maybe click a couple of times then nothing for another 30 minutes then an occasional click. Does that sound like a bearing or a gear? Thanks ------------- 1948 C, 1953 CA, 1948 WD, 1961 D-17 Series 2 Diesel, 1939 WC, 1957 D14 |
Posted By: ac fleet
Date Posted: 15 Jan 2017 at 4:46pm
| Is your mill a pto DIRECT drive or pto jackshaft drive?---I had a 40" M-14 belsaw direct pto drive, and it puts un-duly strain on the pto of any tractor hooked to it . I ran mine mostly with an Oliver 70 tractor and the pto on it would make clunks every now and then!--An MM- UB worked best because the pto speed is faster than the 70.--blade speed on the 40" IP blade was s'posed to run 600-to 650 rpm.---this higher speed puts a lot less stress on the tractor! thanks; ac fleet |
Posted By: DaveSB
Date Posted: 15 Jan 2017 at 6:41pm
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I guess you would call it a PTO jackshaft drive. The mill was originally set up to be run by a large flat belt. We went and made a shaft with a Ford pickup rim and tire mounted between 2 bearings. The truck tire rubs on the original large flat pulley and runs the mill. The PTO shaft from the tractor hooks directly to the shaft we made with the truck tire on it. The truck tire shaft can be adjusted or slid in or out to put more or less pressure on the original large flat belt pulley. We have run this set up for many years and seems to work good. It does take a lot of power to run the mill. This WD has done a good job with it tho, I don't think its putting too much pressure on the PTO shaft, but at the time we set it up, it seemed the simplest way to make the mill operate from a tractor PTO. ------------- 1948 C, 1953 CA, 1948 WD, 1961 D-17 Series 2 Diesel, 1939 WC, 1957 D14 |
Posted By: HD6GTOM
Date Posted: 15 Jan 2017 at 9:49pm
| I would drop that box and make sure there is not something floating around in there. Not a hard job, just messy.. |
Posted By: ac fleet
Date Posted: 15 Jan 2017 at 10:37pm
| That would not put a hard jolt on the pto gears, as the tire would absorb the shock!! sounds like a slick setup!! LOL!!! thanks; ac fleet |
Posted By: DaveKamp
Date Posted: 16 Jan 2017 at 12:09am
on my WD project tractor "Schwartz", the original PTO lower gears were damaged by a foriegn object... a pivot pin from the hand clutch had worked loose, fallen into the sump, and rattled forward, fallen down through the PTO, and got hung up 'tween the intermediate and lower gear, breaking out a tooth. I split the tractor, pulled out the hand clutch, and gave it a careful reassembling with the correct pins, correctly installed... then I replaced the intermediate gear and lower PTO gearbox. It wasn't exactly 'easy' to replace that lower gear, but I did get it changed out from below.  ------------- Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest. |
Posted By: Allis dave
Date Posted: 16 Jan 2017 at 7:06am
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You really won't know until you pull the gearbox off. It's not very hard. Better to check it sooner than later. Make sure you get the correct gasket when re-installing. It's the gasket thickness that sets your gear mesh. Everything in the gear box is easy to change. Put a new seal in it too while it's off. If somethings wrong with the intermediate gear up top, that much harder to replace. From what you describe though, it doesn't sound like that the problem. |
Posted By: TramwayGuy
Date Posted: 20 Jan 2017 at 8:18am
| The later Wd45's used a tougher housing material because the original housing had failures due to breakage. |
Posted By: DaveKamp
Date Posted: 20 Jan 2017 at 3:01pm
Regardless of the component, breakage is the most common failure mode.  I haven't seen a housing that ever broke without some other reason. I've seen a housing and gears that broke because something that wasn't supposed to fall down into the PTO gearbox DID. Amidst the list: 1) Pin from hand clutch 2) Ball bearing from somewhere... 3) Pieces of chipped gear 4) Water from transmission (becomes ice, which expands to the order of 112,000psi when it freezes). ---Not necessarily in that order. The intermediate idler gear's shaft is the tricky part, but can be done from below. It takes copious amounts of patience, an open mind, and some clever thinking... some chopsticks, a magnet, two midgets, a rubber chicken, and some ketchup... ------------- Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest. |
TramwayGuy wrote: