One of the best and most accurate explanations of a Deere V4 pony I've seen yet. Most people don't really understand them very well. I've had two apart. A fun but expensive adventure

Wide open the little pony gallops at 5500 rpm. Both cylinders on each side fire together. It was actually the first engine John Deere developed from scratch.

another good thing with phony motor you can build oil pressure in the big motor before starting whitch l thing on a cold morning this a life saver on the big motor!! l be watchin!!!

That is why I love the 720 pony start tractors. I'll have another one....someday. Doc

Some of the Early Ihc hit miss tractor had a small pony style motor to help start the big main engine

I had a 1954 John Deere Model R with the two cylinder pony motor. It was electric start with choke, two pull out knobs on the left by the clutch and compression release levers. There was no throttle, it ran at 4400 rpm until you closed the gas lever to kill it. I miss my tractors. I sold all of them and started buying antique cars that you can do a lot more with.

In the early years Cat and John Deere worked behind the scene at lot on development of motors and transmissions.

Awesome video. I never would have thought that it would circulate the engine coolant. That's brilliant lol.

I'm impressed with how good of shape that tractor is in. Great candidate for restoration. Can't wait to see it all finished 👍

Most people are unaware of it but in 1958 electric start was first offered on the 720's. I've only ever seen one and that's the one sitting in my barn. It's hasn't been converted from a pony start. It's all factory. I farmed with it until it cracked a piston in 2000. I hope to get it running again soon. It was my dad's tractor and my son is very interested in it so hopefully it will stay in the family for a long time.

Waukesha used pony motors to start their big engines that approached 3000 ci displacement. There's a museum in England that uses a steam powered "pony motor" to start a much larger steam engine that was used to pump water. Those are interesting videos to watch.

My uncle farmed here in South Australia. He used a late model 2 cylinder John Deere for many years with its unique exhaust sound. It had a pony motor. When he replaced it with a 6 cylinder Chamberlain I remember him saying the fuel usage increased significantly.

Great explanation. I’m learning so much. You really have the coolest projects!! The lighting has been phenomenal!! Cat is the only engine I ever heard of with a pony motor but I never saw or played with one.

Thank you for the breakdown on how the pony motor works. Good explanation on the benefits of a pony motor

grew up manitoba cold winters 730 would always start a must with the catle 61 now love the 2 cylinders have d m g b br all run restoreing is such a great hobbie love your video

I believe you are correct.. cat and Deere.. cat I believe had the first one.. Looking good! Thanks for the video!

Thanks for the lesson, never knew any of this. I wasnt around the Johnny Poppers

Great explaination. Thanks I didn't realize it did all that. I always just thought I was a gas motor to turn the diseal, kinda like a gas version of an air starter. Thanks for sharing your knowledge. Maybe today's manufacturers could take a lesson.

Thanks for explaining how a pony motor works awesome video!!

Interesting that they prevented fuel flow instead of pulling ignition on the pony if oil pressure wasn't built up yet. I'd guess that's to prevent flooding the pony before oil pressure is built up? Good video, love these little v4 puppies.

I love this video very interesting stuff my dear friend

Cat made their own pony motors. Waukesha had pony motor diesels. Early Allis diesels had pony motors but they may have been Waukesha. Best regards from Indiana.

Excellent video , yes pony motors are excellent helpfull too and hope see more too!

The clutch element in the pony motor that has the 3 balls in it is called an overrunning clutch. When the main engine starts while the pony motor is still clutched in, it allows the main engine to establish a disconnect between it and the pony motor as now the rpm of the main can exceed that of the pony motor and disengagement of the clutch is possible without gear grinding or overspeed damage to the pony motor. The electric starter on Honda motorcycles also incorporate an overrunning clutch that is the only separation between the starter motor and the engine. Some technologies last through the ages...

Lots of Russian tractors and big trucks had 2 cycle (I think) pony engines based on what I saw on KZfaq…

I agree with you no matter what color you like keep them as original as possible

Thanks for that info. Very informative.

Thanks you very much for the informative video. Most guys just want to show off their antique pony motor tractors and don't share their knowledge.

From my understanding John Deere used CATs pony motor in the model R, then they worked together and Deere built there own pony motor for the 80, 820, 830. Hence the difference from an opposed 2 cylinder pony to the V4 cylinder pony. Some say that the 2 cylinder pony is far better then the 4 cylinder, but never been or worked around a 2 cylinder one to say myself. Also, a lot of die hard Deere fans at the time called the V4 pony Twin 2 cylinders because they didn't want to admit that Deere was switching to engines with more cylinders then 2 like other competitors like International.

I used a 70 diesel for having for many years

My dad had a 730 diesel electric start he bought in 1959 or 60 John Deere used a mechanical linkage to the valve train that when starting you depressed it with your foot and it partially opened the valves to decompress the engine to aid the diesel in spinning over. And as soon as you released the decompression pedal it would begin to fire on diesel. It was not always easy especially on very cold days. I think that John Deere sold most of these in the lower 48 states and continued to sell pony motors starting engines in the colder states and Canada. Most of the other diesel tractor brands IHC, MOLINE, ETC SOLD ENGINES WITH GLOW PLUGS AS STARTING AIDS ON THEIR TRACTORS. WE HAD AN 560 INTERNATIONAL THAT HAD GLOW PLUGS BUT, AS I REMEMBER THOSE GLOW PLUGS WERE A PROBLEM BECAUSE OF THE AMPERAGE DRAW ON THE BATTERIES.

When i was a teenager , the farmer i worked for bought a 730 diesel 1958 model with electric start . At 0 degrees we could not even pull start that tractor !

Ford had pony motors with Detriot Desiel motors in Highway Transport 18 wheeler tractor in 1970's to 1990 in one's called Aero Macks!

Interesting -- Pony Motor V4cyl. Like it.

Thank you for your information

To clear up a point mentioned in a comment, commenter stated the the v-4 pony motor fired 2 cylinders at a time, one on this side and one on that side. While true, It is wasting a spark as many systems now do. How it happens is 2 sets of points set at 90 degrees of each other fire the plugs in an obscure fashion. Each coil fires both plugs on one side, the other set fires both plugs on the other side. Now, first set of points and coil, fires both plugs on one side firing one cylinder, as engine rotates 90 degrees the other set fire one cylinder on the other side, yet it fired both plugs. Then the engine rotates 270 degrees and the first set then fires both plugs on the first side igniting the 2rd cylinder on that side, or 3 cylinder in rotation of firing order. Engine then rotates 90 degrees to fire the last cylinder in rotation, then rotates 270 degrees and the process starts over. Ain't that neat, at a slow idle the engine sounds almost like the 2 cylinder tractor it's trying to start.

we had a 1948 IH TD 14 crawler with a pony motor. I understand it was a WD 9 tractor engine

My understanding is cat and John deer worked together developing the R. They had an agreement cat would do construction and deere will do farm. Fast forward deere got into construction and farm equipment

Excellent explanation.

Actually, the engine RPM was regulated at 5500 for the v4. The 2 cyl pony for the R was regulated at 4000 RPM.

Great video. I've got two 720s I'm going to restore.

Lord Muck has video on Belarus crawler with single cylinder 2 stroke pony, I’m thinking 2stroke turned over easier in their super cold winter.

A Chinese air heater works well too for heating the intake àir...plus you can use it to heat your feet

I’m not we’ll versed in John Deere pony motors but the cat ones don’t circulate water unless they are spinning the diesel motor so you run the risk of overheating the pony motor if you’re not careful

good job , i have a R 1949 is the 2 cylender work like the one you are showing mag has been rebuilt by rebuilt mags rudy calin startes has been rebuilt engine has been rebuilt new battery still will not crank hope you can help

I saw a video of an old bulldozer that had a little two stroke starter engine that would start the big diesel.

I am working on a d8 cat just gotten pony engine mounted back on

The farmall MD didn't have a pony on it but was a interesting design also. Boomhauer showed me his once that was a interesting explanation to say the least lol

pony motor is such a great method to start the old diesel tractor motors. pre heats in cold weather, makes it so much easer to get it running, how do you start the pony motor? electric starter?

You eloquently explained the benefits and advantageous of a pony motor versus electric start on the main engine. Do you know if the pony motors were two-strokes or four?

Later model semi trucks have pony motors on them that ru heat and air , also in cold weather i could start the APU unit and let it run a few minutes and it would heat the big engine and the cab , they were great when they worked 🙁

Using the recommended 30w Non-detergent oil ,, does your oil turn milky looking ?

About all the russian diesels use a 2 stroke single cyl pony

👍👏👏👏

I reckon that the term "pony-motor" just sounds cool, even though it is a pony engine.

More importantly, it'll start without undo wear and tear.

My pony motor on my 70 only has 1 lever.

by the way this is on a 1949 R

I'd still convert it to a 12 volt starter anyways!! It's more efficient than wasting gas for a diesel. Or wasting time to start up a gas by hand.

why or what wou;d cause a pony motor not start ? has been rebuild , new mag turn over but will not start help!

Just a small note, why they used oil psi to open gas valve, even if you manually shut off gas, gas cannot flow to the metering valve. There is no carb gas bowl, gas flows direct to metering valve. Reason? Even if carb had a bowl, the vibration from the diesel would tend to cause the pony motor to flood causing hard starting. Another thought, Cat and John Deere were married at the hip for a few years. How about that!!

A 4cyl pony by the look and the size couldn't it be converted to run a small tractor by itself

4000 rpm idle, 5000 rpm wide open.

Why would anyone in they're right mind delete a pony motor ?

Wanted to work on my tractors had to work on my truck not nearly as fun

4000 -5500 rpms

A D2 D4 D6 used a opposed twin starting engine, a D7 D8 D9 used a upright two cylinder, Cat built their own starting engines

R had an apposed two cylinder

Lj

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