Front loader brush cutter

[Jd5203]

I am looking into getting a skid steer brush cutter for my john deere 5083e for the loader that has a flow of 20 gpm. What I am worried about is the tractor only has 16 gpm, will it make much of a difference, and will I overpower and eventually burn up my hydraulic pump. The cutter is supposed to cut 10" brush, I am wondering if it will decrease size of brush it can handle. Thanks

 

[J_J]

You blades will simply cut at the speed the GPM's provides to your hyd motor.

You can figure that out by knowing the GPM's, and the cu in.

If the motor were a 20 cu in motor, your 16 GPM would turn that motor at 185 rpm and if you had 20 GPM's, turn it at 231 rpm.

You are probably going through a gear box to increase the blade tip speed.

If the brush is to much for the cutter, it will stall the motor and motor circuit will go into relief.

The torque of the hyd motor is based on the pressure.

 

[Jd5203]

So basically, my tractor would just apply less torque than for what they want and it wouldn't be creating any back force on the pump because it is determined by the flow going through it. That makes sense, thanks for the info.

 

[Jd5203]

You blades will simply cut at the speed the GPM's provides to your hyd motor.

You can figure that out by knowing the GPM's, and the cu in.

If the motor were a 20 cu in motor, your 16 GPM would turn that motor at 185 rpm and if you had 20 GPM's, turn it at 231 rpm.

You are probably going through a gear box to increase the blade tip speed.

If the brush is to much for the cutter, it will stall the motor and motor circuit will go into relief.

The torque of the hyd motor is based on the pressure.

I found something called a hydraulic flow intensifier that would increase my flow by increasing pressure. do you know how to fiqure out what ratio i would need to go from 16 gpm to 25 gpm. thanks for helping with this. I have not worked with hydraulics very much.

 

[J_J]

I have never used them, but here is a description of the pressure intensifiers.

https://www.google.com/url?sa=t&rct...9wudFd0jVIzacymTg&sig2=r7D10HSLAyUQUe4mA2e5wQ

 

[Farmerford]

Jd5203:

I did something similar with a Kubota L4330, though on a much smaller scale than you are proposing. To get the full hydraulic flow you will have to keep the engine at high rpm. Will your tractor go slow enough at that rpm to ease the cutter into the larger trees? My Kubota has a hydrostatic transmission so I can creep very slowly, and I still have to be careful.

I find that even being careful, the load of cutting often trips the pressure relief valve, which heats up the hydraulic fluid quite a bit. Your large tractor may have enough hydraulic fluid cooling capacity to handle the heat, but mine did not. I am now using a PTO driven pump and separate reservoir.

Send us pictures of what you do.

 

[wdchyd]

a pressure intensifier is used for clamping circuits.....it will not boost gpm .....if anything it robs gpm to establish higher pressure when clamping, doesn't work for increasing gpm to spin a motor

 

[J_J]

Jd5203,

You have enough HP to add a PTO pump and not use your tractor hyd..

This pump will provide 21 GPM @ 2,000 PSI & 32.1 Hp input.

9.9 CU IN PRINCE HC-PTO-1AC PTO PUMP CI 540 RPM

 

[DT86]

Knowing which cutter exactly you are thinking about may help.

FWIW, I have looked at low flow brush cutters and several are rated for 15-25gpm. Perhaps the number you saw was max GPM?

 

[whis]

hope you have a cab and screens on it, too much brush coming back at you