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Ford Tractors Discussion Forum


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Author  [Modern View]

02-10-2019 18:58:57

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I have a truck picking up the 70 4000su. it is very cold in midwest where the tract or has been sitting for 3 months they told me they had to take the drive shaft off the brush cutter. either they did not know how turn it off? cansomeone explain how it operates, i have read about the 2 stage clutch but i thought if the lever on rear was moved the pto would not turn no matter how the trans position or gear.

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02-11-2019 20:09:03

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 Re: 540 INEDPENDENT PTO in reply to swattley, 02-10-2019 18:58:57  
i agree more i read about the SU, this tractor is going to mean many things to me. first i been trying to find an old ford i can afford for couple years, second something i have not mention, this tractor is almost be given to me it was owned by a best friend i been working with for 30 years, he just passed away at 54, very suddenly. so i will keep it is great condition.

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Ultradog MN

02-11-2019 17:19:06

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 Re: 540 INEDPENDENT PTO in reply to swattley, 02-10-2019 18:58:57  
Good info for you (as usual) from these guys.
The one thing I would add or maybe phrase differently is this:
The pto in an Ipto tractor is not hydraulically operated.
Rather, it is hydraulically engaged.
I like Ipto but actually prefer Live pto.
What I like about it is you can snap it out anytime no matter what the tractor is doing otherwise.
There are a few things I dislike about it.
First, if you get in a jam on any other tractor you can stomp on the clutch and that shuts everything down - forward motion and the pto. And, you can engage the pto slowly by slipping the clutch.
With Ipto you have to remember which function you wish to stop - clutch vs pto or both. Secondly, if you are running a bush hog with Ipto you have to remember to idle the engine way down then bury the mower in heavy, thick stuff to stop it. If you don't the mower keeps spinning for a while and will wear out your pto brake in short order.
The pto brake is just a cheesy little thing and nowhere near strong enough to stop a heavy mower. All it is really designed to do is keep the pto from spinning when it is shut off.
Lastly, even if you idle the engine way down the hydraulic pto clutch really hammers the drive line of the mower when it engages.
You can feather it a little but it takes practice and still hammers a bit.
Ford seems to have had an aversion to Inching Pedals and feathering valves.
I understand Ford corrected that hard pto engaging on later models by allowing you to feather the oil flow to the pto clutch but on the 1965-1983 4000s and 4600s
they really Hammer the drive line on your mower when they engage.
People will tell you you can engage/disengage Ipto any time but you will learn quickly to Not engage it at high rpms.
The SUs are very, very good machines though. They are kind of a dream tractor for many of us here.
Be glad you are getting one.

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Destroked 450

02-11-2019 16:12:35

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 Re: 540 INEDPENDENT PTO in reply to swattley, 02-10-2019 18:58:57  
Top pic is from my factory Series 10 manuals

Bottom pic is from my -000 series manuals

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02-11-2019 14:21:11

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 Re: 540 INEDPENDENT PTO in reply to swattley, 02-10-2019 18:58:57  
what book is that, the illustrations look great.

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Destroked 450

02-11-2019 07:23:56

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 Re: 540 INEDPENDENT PTO in reply to swattley, 02-10-2019 18:58:57  
Yes the engine turns the pto but the pto input shaft (8) is splined to the pressure plate (7) and turns any time the engine is running.

The pto lever is connected to a hydraulic control valve (10) that engages a clutch assembly (3) which is splined to the pto output shaft (1).

This type of pto operates independent of any other tractor operation, it can be engaged or disengaged any time the engine is running regardless of weather the tractor is moving or stopped.

The photo shows the pto turned off with the brake engaged, cold thick oil causing extra drag on the clutches or warped clutch plates can easily over power the brakes holding capability allowing the pto output shaft to rotate when the pto is turned off.

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Sean in PA

02-11-2019 06:54:25

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 Re: 540 INEDPENDENT PTO in reply to swattley, 02-10-2019 18:58:57  
There is a shaft from the flywheel through the transmissio to the rear axle that drives both the pump and hte PTO. The pump is actually two pumps in one body. The main larger forward section of the pump powers the 3 point lift hydraulics. The smaller rear section of the pump powers the PTO controls. The handle on the left side merely controls a hydraulic valve. When the handle is in the "engaged" position the PTO brake should be disengaged and the PTO clutch should be engaged, and then the handle is in the disengaged position the clutch should be disengaged and the brake should be engaged. The clutch plates are usually slightly warped from usage over time and will provide some drag to make the PTO spin even when the clusth is "disengaged", and the brake usually wears over time so that it doesn't apply as much braking force as it should.
How fast was it spinning the mower and how heavy of a mower is it? Since you say it is very cold there, it is possible that there is water in the system and thigs are frozen such that the brake will not engage and the clutch will not disengage.

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02-11-2019 03:19:30

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 Re: 540 INEDPENDENT PTO in reply to swattley, 02-10-2019 18:58:57  
Quoting Removed, click Modern View to see

does the clutch operate the pto at all how does this system work? so i guess the motor is not turning the pto, the hydralic pump. how how does the pto get turned off

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Destroked 450

02-10-2019 20:04:08

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 Re: 540 INEDPENDENT PTO in reply to swattley, 02-10-2019 18:58:57  
4000SU doesn't have 2 stage clutch.

It has independent pto that is hydraulically operated.

Often times in cold weather the pto clutches have enough drag to over power the pto brake or the pto brake is worn out and won't hold.

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