Pto explained

[deniscooper]

Hi,

Please forgive my ignorance.

Case 895 tractor, how do i tell how fast the PTO is running as the manual only shows how its read on the digital display. My cab only has the engine rpm and on it a yellow marker saying PTO at about 2100rpm and red marker saying PTO max at about 2300 RPM.

Its only got a 540PTO.

I bought a chipper from an auction on the weekend and wondering what speed it needs to run at.

Thanks and appologies if its a stupid question.

 

[Lincs Lass]

540 pto is generaly about 1800rpm

 

[Boohoo]

Does a Case 895 not have 2 pto shafts? 6 spline for 540rpm and 21 spline for 1000rpm, so 540@2100 engine rpm and 1000@2300 engine rpm? The 21 spline shaft might have a cover over it.
No idea about the chipper. Any stickers on it to indicate the pto speed? If not google the make and model and you might find an operators manual

 

[Cowabunga]

Hi,

Please forgive my ignorance.

Case 895 tractor, how do i tell how fast the PTO is running as the manual only shows how its read on the digital display. My cab only has the engine rpm and on it a yellow marker saying PTO at about 2100rpm and red marker saying PTO max at about 2300 RPM.

Its only got a 540PTO.

I bought a chipper from an auction on the weekend and wondering what speed it needs to run at.

Thanks and appologies if its a stupid question.

Now then, some idiot will no doubt accuse me of Googling this, but you don't get this on Google.

What you need to establish is the engine revs at which the 540 PTO rpm is attained. Now going from your dash tachometer it seems to indicate that your tractor attains 540 at 2100rpm. I am not acquainted with this model range and although it seems to be high engine revs, it is no more so than my old JD2140.
Unless someone here can confirm one way or another whether that is correct, and unless you have a hand held tacho to check the shaft speed directly, we'll assume for now that this is the case.

So to find another PTO speed……

Say you want 400 PTO rpm for a Tedder or something. To get the engine revs that gives you 400 at the shaft you divide 2100 by 540 then multiply by 400.
2100/540=3.888*400=1555 engine revs.

Say you want to know what PTO speed you get from say 2000 engine revs. Then divide 540 by 2100 then multiply by 2000
540/2100=0.257*2000=514 PTO revs

The chipper is another story. Does it say on the guard whether its meant to run at 540 or 1000rpm? If it is 1000, then you are out of luck I'm afraid. Using the formula above
540/2100=0.257*2300= 591 PTO RPM is the maximum you'll get at rated engine speed [flat out under load in effect]

 

[deniscooper]

just had a look, its a bear cat 70554 and its got a sticker that says 540rpm.

so to run it at that, assuming 2100rpm is 540 on the pto then i just have to set the revs whilst in neutral on the creeper setting?

 

[Cowabunga]

just had a look, its a bear cat 70554 and its got a sticker that says 540rpm.

so to run it at that, assuming 2100rpm is 540 on the pto then i just have to set the revs whilst in neutral on the creeper setting?

Not sure what any gearbox creeper setting has to do with it. You won't be moving whilst using a chipper surely. Just start the PTO at low/Idle engine revs and increase the revs to 2100 or so before inserting the wood in the mouth of the chipper.

Be very very careful with these things. They should really not be used without someone with experience and a good eye for risk management nearly to supervise. At least to begin with.

 

[deniscooper]

sorry maybe its not the creeper i meant....

i won't be moving no, but i won't be sat in the cab either when using the chipper, so i meant increase the revs using the stick on the dash / steering wheel (i thought that was called the creeper)

 

[Cowabunga]

sorry maybe its not the creeper i meant....

I won't be moving no, but i won't be sat in the cab either when using the chipper, so i meant increase the revs using the stick on the dash / steering wheel (i thought that was called the creeper)

Hmm. Not sure what you mean really. You need to set the hand throttle for the revs, which will be to the right of the steering wheel or on the side console on many models.
Maybe your tractor has a forward reverse shuttle gear lever with a neutral position? Usually to the left of the steering wheel unless also on the right hand console. [As I said I'm not familiar with this tractor without seeing it]. If so, yes, place the shuttle in neutral and the gear lever to the side also in neutral to be safe. Don't forget to have a working effective handbrake and to use it at all times when stationary and especially when vacating the driver's seat.

 

[Mursal]

I would use the chipper at or around 1500 engine revs, to start with.

If your happy with the results, meaning you can feed it and the tractor doesn't stall, leave it at that.
If you find you can kill the tractor with the material you put in, increase the revs by 150 - 200RPM.
Keep in mind that if it stalls (stops completely), the chipper will take a bit of freeing out, so try and avoid that.
This isn't the book method, but it works well for older tractors that you dont want screaming their head off while your working.

Always leave the tractor cab door open (tie it if needed) so you can disengage the PTO or even pull the engine stop in an emergency.

Edit:
One stick on the dash is called the creeper or hi / low gear you can work without clutching.
That's if the tractor has one fitted.
The other handle will be hand accelerator to set engine revs for your type of work.

Be extremely careful with the PTO at all times and ensure you have a full PTO guard fitted and not turning when in operation. They can kill in seconds .......

 

[Half Pipe]

Hand throttle!

 

[deniscooper]

thanks guys for the advice.

i

Hmm. Not sure what you mean really. You need to set the hand throttle for the revs, which will be to the right of the steering wheel or on the side console on many models.
Maybe your tractor has a forward reverse shuttle gear lever with a neutral position? Usually to the left of the steering wheel unless also on the right hand console. [As I said I'm not familiar with this tractor without seeing it]. If so, yes, place the shuttle in neutral and the gear lever to the side also in neutral to be safe. Don't forget to have a working effective handbrake and to use it at all times when stationary and especially when vacating the driver's seat.

it is the hand throttle i mean - thanks.

 

[Cowabunga]

I would use the chipper at or around 1500 engine revs, to start with.

If your happy with the results, meaning you can feed it and the tractor doesn't stall, leave it at that.
If you find you can kill the tractor with the material you put in, increase the revs by 150 - 200RPM.
Keep in mind that if it stalls (stops completely), the chipper will take a bit of freeing out, so try and avoid that.
This isn't the book method, but it works well for older tractors that you dont want screaming their head off while your working.

Always leave the tractor cab door open (tie it if needed) so you can disengage the PTO or even pull the engine stop in an emergency.

Yes, a lot of nominally 540 machines only actually require 400+ rpm to work efficiently. On this tractor, that means 1600+ rpm though. If it was a Massey or a Ford, then lower engine revs would give the same PTO speed.

The formula I used to illustrate, works for all. Just alter the figure at which 540 is attained to suit.

 

[Cowabunga]

thanks guys for the advice.

i


it is the hand throttle i mean - thanks.

You're welcome.

 

[Boohoo]

Operators and parts manuals for your chipper
http://www.bearcatproducts.com/Product-Support/Find-A-Product-Manual

The operators manual suggests a maximum pto horsepower of 30, your 895 should be at least 70 so don't feed too much in at once.

To start chipping apply the handbrake, put the gear levers into neutral, engage the pto and increase the engine revs to 2100rpm with the hand throttle. Once you've finished reduce engine revs to tickover, then stop the pto.

An operators manual for the tractor might not be a bad idea if you are unfamiliar with the 895 or tractors in general. Here's one on ebay
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/290702752870 and google will turn up plenty of companies that sell used and reprinted manuals

 

[Cowabunga]

Operators and parts manuals for your chipper
http://www.bearcatproducts.com/Product-Support/Find-A-Product-Manual

The operators manual suggests a maximum pto horsepower of 30, your 895 should be at least 70 so don't feed too much in at once.

In which case I would not be tempted to run it at lower revs. The higher the shaft speeds the lower the torque on them. Be sure not to overload it even so though or you will either break a shear bolt or/and block the chipper solid.

 

[Hooby Farmer]

Give her plenty of throttle, it'll be grand.

 

[SuperTwo]

Assuming the pto gearing is the same as an 885xl the rated pto revs is achieved at 2140rpm for both the 540 and 1000 shafts.
The foot throttle should be set to rev to 2140rpmwhen fully depressed so its quite easy. Engage the pto at low revs depress the foot throttle fully and hold then pull the hand throttle until you feel it taking up slack and you cant go too far wrong

 

[Cowabunga]

Assuming the pto gearing is the same as an 885xl the rated pto revs is achieved at 2140rpm for both the 540 and 1000 shafts.
The foot throttle should be set to rev to 2140rpmwhen fully depressed so its quite easy. Engage the pto at low revs depress the foot throttle fully and hold then pull the hand throttle until you feel it taking up slack and you cant go too far wrong

I believe your foot throttle, and hand throttle as a consequence, was out of adjustment. It should have revved far higher than that at flat out.

The rated speed of his 895 is actually 2400rpm , so at no-load it should rev to around 2600rpm.

 

[SuperTwo]

I believe your foot throttle, and hand throttle as a consequence, was out of adjustment. It should have revved far higher than that at flat out.

The rated speed of his 895 is actually 2400rpm , so at no-load it should rev to around 2600rpm.

You may well be right ive never done any pto work with another 885/895 apart from my own. Mine revs out to about 2500 rpm with no load with the hand throttle pulled all the way back.

 

[Ruston3w]

C'mon, it's really only a 674 so probably just needed a couple of inches of oil/dirt mix digging out from under the pedals, easily find another 200rpm