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Converting Belly Mower to Hydraulic drive

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EIEIO

10-13-2006 18:25:11

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I have a Case International 274 it's a Japanese version of a Farmall row crop tractor. I want to convert a belly mower from belt driven to hydraulic, the tractor pumps 5.7gpm of fluid. My question is could I just mount a High Pressure Hydraulic Gear Pump in place of gear box on mower? Are would it be better to mount electric pump and gear pump on mower? Also do you think the spindles and bearings on a mower would hold up to the strain of a hydraulic system? Sounds like alot of rigging but this way it could stay under tractor always and still have use of pto.

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J Schwiebert

10-14-2006 03:49:39

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Re: Converting Belly Mower to Hydraulic drive in reply to EIEIO, 10-13-2006 18:25:11

You need to do a lot more math work, Hydraulic pumps are from 85 to 90% effeceient So are hydraulic motors, As has been mentioned you will generate a large amount of heat. Also hydraulic motors are rated in torque output. Pressure is torque, flow (GPM in and out ) will determine the speed of the mower. More questions? J.

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Bill WI

10-14-2006 12:07:19

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Re: Converting Belly Mower to Hydraulic drive in reply to J Schwiebert, 10-14-2006 03:49:39

I have a 54" front mounted snow blower designed for PTO from rear of tractor with roller chain sprocket drive. Tractor is compact 23 hp without live power. Intended to use an auxilary pump off the PTO and Hydraulic from a skidsteer would I be shooting myself in the foot by loosing efficiency? If I understand right, I would loose about 1/4 in pump and motor. Thinking I'm low on power already.Thanks

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EIEIO

10-14-2006 17:36:50

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Re: Converting Belly Mower to Hydraulic drive in reply to Bill WI , 10-14-2006 12:07:19

Thanks for all the comments. Still don't have this web sites functions figured out, but will be asking more ?'s.

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JackT

10-13-2006 18:54:13

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Re: Converting Belly Mower to Hydraulic drive in reply to EIEIO, 10-13-2006 18:25:11

I'm in the process of doing almost the same thing. I'm converting a PTO mower deck from an old golf course mower for use on a Bobcat skidsteer. TRK is right, 5.7 GPM is no where near enough. You'll need at least 15 GPM @2500 PSI to get the RPM and torque you need. Spindles and bearings shouldn't be a problem as long as you aren't drastically increasing the torque from your PTO system to hydraulic system. Go to Eaton Hydraulic's Char-lynn website and look at the 104 series motors. That's what's used on most hyd. drive mower decks. P.S. I got my hyd motor on Ebay for $100--about 1/4 of the new cost.

Feel free to email me with any questions.

Good luck!

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IA Roy

10-13-2006 18:47:06

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Re: Converting Belly Mower to Hydraulic drive in reply to EIEIO, 10-13-2006 18:25:11

Electric pump and motor is not feasible if you mean running a pump off the battery/alternator combination. A 60 amp output from an alternator is only about 1 horsepower even ignoring the inefficiencies of the system. Not nearly enough power.
One thing mentioned on this site when running a pto hydraulic pump is to get a pto extension shaft that goes thru the pto pump and is long enough to connect another pto shaft from an implement. Allan in NE probably has a picture he would share with you from his Farmall H with a pto pump to run his loader. This would require a pto pump with a female splined input shaft. Some pumps are not made this way and would not work.

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T.R.K.

10-13-2006 18:39:11

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Re: Converting Belly Mower to Hydraulic drive in reply to EIEIO, 10-13-2006 18:25:11

This is not as easy as it seems.

1. I am sure 5.7 GPM is not enough flow to get the hp you want at the rpm you will need. You need to know how much fluid your hyd motor will need per minute to transfer the hp you want at the speed you want.

2. heat is a by-product of constant loaded hydraulic circuits like you are proposing. The oil gets too hot and looses its anti-foaming abilities and also the heat is hard on 0-rings and other seals. I doubt your tractor was built with an oil cooler in the hydraulic circuit. Another way around this is to make the hydraulic reservoir great big, but then you have to have a way to mount it and it will take a lot of expensive fluid.

You mention using a high pressure hydraulic gear pump. I am thinking that most hydraulic motors are the vane type or gear-rotors. I think it is because they develop more torque per cubic inch displacement than a plain gear pump.

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