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  1. #11
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    Sep 2005
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    0

    Default Re: PTO RPM??

    It is difficult to transmit more than 85 hp through a normal 540 pto shaft (Case-IH uses some very exotic metals to get up to 150 hp but it costs money!). So, for big tractors 1000 rpm was developed to supply more power to pto equipment. I realize this does not apply to compacts, but that is the standard for big farm equipment.

    For compact tractors, all standard rear pto equipment will be 540 rpm. If your tractor offers different rear pto speeds, it may have non-standard equipment available to use those speeds. But 'normal' equipment does not use anything but 540 rpm.

    It can be handy to run the tractor at 1/2 throttle and run a low-power device with the 1000 rpm pto, but forgetting & over-reving the device can blow things apart.

    In short, all a tractor of less that 85 hp needs is a rear 540 pto.

    (Is the Century a Chineese tractor? Can't remember, but I'd watch what I was getting if it is. I'm mostly color blind, but don't think that country has it's tractor production lines up to grade yet.)

    --->Paul

  2. #12
    Epic Contributor Bird's Avatar
    Join Date
    Mar 2000
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    39,489
    Location
    Texas

    Default Re: PTO RPM??

    Right, Paul. One of my neighbors who was using an 85hp Oliver was once bemoaning the fact that he couldn't borrow some of his brother's implements because the brother had a much bigger tractor and the implements he would like to have borrowed required the 1000 rpm PTO and the Oliver only had the 540.

  3. #13
    Platinum Member
    Join Date
    Jul 2000
    Posts
    951
    Location
    Sierra Foothills, Northern California
    Tractor
    Kubota B7300; JD LX233

    Default Re: PTO RPM??

    <font color="blue"> run a rear mower at 1000rpm and amazing things can happen </font>

    OK, this got an "out loud laugh" from me... You must share what kinds of things can go on. I'm sure they aren't especially pretty, though [img]/forums/images/graemlins/ooo.gif[/img].

  4. #14
    Elite Member rockyridgefarm's Avatar
    Join Date
    Mar 2002
    Posts
    4,461
    Location
    Road 4310
    Tractor
    Deere 4310 HST MFWD

    Default Re: PTO RPM??

    Our Yanmar had the 1000rpm setting, and just the noises the Bush Hog made when in that speed was enought to scare the bejeevers out of you...

    Basically, it is running things a twice its rated rate. You sure don't want to experiment on something of that mass like that...

  5. #15

    Join Date
    Apr 2001
    Posts
    388
    Location
    Southern Maryland
    Tractor
    L3010DT

    Default Re: PTO RPM??

    Don't know about RFM's (just thing about that tip velocity), but a square bailer without a kicker can very nearly turn into a kicker bailer if run on 1,000 rpm. My dad's David Brown has a 2 speed PTO, only one shaft, pull up the lever for 1,000, down for 540. Mom pulled up once. That bailer was plunging like a mad plumber. Dad looked at me, I looked at dad, and the light bulb came on for both of us. We got it slowed down before self destruction, but it was imminent. Most larger tractors have 2 shafts with different spline configurations such that you can't screw up and make the wrong connection.

    Our sheller wants about 800 rpm to work right, works well on the 2 speed, just idle down a bit and there you go. At 540 it seemed to turn the corn to meal, not enough air velocity to blow the shelled corn out of the mill.

    Nick

  6. #16
    Gold Member
    Join Date
    May 2002
    Posts
    419
    Location
    s.c.
    Tractor
    Mitsu D1550 Farmall super A

    Default Re: PTO RPM??

    in soft dirt at 1000rpm my JD tiller will flat make a nice seed bed [img]/forums/images/graemlins/cool.gif[/img]

  7. #17
    Super Member
    Rest in Peace
    frank_f15's Avatar
    Join Date
    Mar 2001
    Posts
    6,033
    Location
    BUFFALO ,NEW YORK AREA
    Tractor
    kubota b2400- R4 tires

    Default Re: PTO RPM??

    nope : rfm run at 540 rpm and all new er tractors will have rear pto @540 rpm, your engine rpm will differ with different tractors to attain the 540 pto speed.

  8. #18
    Veteran Member
    Approved Advertiser
    HayDR's Avatar
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    Oct 2002
    Posts
    1,884
    Location
    Johnson City, TN
    Tractor
    JD 2040,2240, 2355, 2755, 4055

    Default Re: PTO RPM??

    It is very dangerous to use any 540 RPM implement at a 1000 PTO speed. It will void the warranty! If you need a bigger tractor buy one. A finish mower used in this manner could cause serious injury or death. Please guys do not encourage anyone to play with the thought of trying this.

  9. #19
    Veteran Member
    Join Date
    Jan 2002
    Posts
    1,499
    Location
    Lancaster PA
    Tractor
    Yanmar 186D

    Default Re: PTO RPM??

    I think pto pumps and generators are designed to run at 1000 rpm. I have read about running an implement on the 1000 rpm setting and ideling back the engine till the pto is spinning at 540, The theory is that it increases fuel econemy and cuts down on engine wear and tear. The problem I see with that is that most of these engines were designed to run best at pto speed which is often marked on the meter. Big farm tractors sometimes have two pto stubs which are different so you can't hook up the wrong kind of implement to the wrong stub. I have seen Woods rear finish mowers that were designed to run off the Kubotas 750 rpm setting.

    Chris

  10. #20

    Join Date
    Dec 2002
    Posts
    306
    Location
    Magnolia, TX
    Tractor
    99 JD4200 4WD Collarshift

    Default Re: PTO RPM??

    Since we're on the subject. I seldom even run my brush hog to 540 rpm. I'm usually just cutting grass which may get to 1 foot, but normally less. It seems to cut okay, faster is definitely a little better. But with the manual transmission I have, I'm comfortable with a particular gear setting and rpm and feel there's probably a benefit to the engine. I'm at work, but I think engine rpm is 2000 and something and I really like to keep it around 1500-1700 - just sounds better.

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