Check me out please.

[NCMau]

I am in the process of putting together a side mowing deck for my tractor to use as a trimmer for my wood trails. I would like to use everything I already have on hand with the exception of the flow control (Surplus Ctr 9-064-50)

Here is what I have:
Eaton hydraulic motor, 101 1026 009. Motor to be driven by the tractor 7.1 GPM PTO pump that operates the loader.
According to Eaton specs, this motor has a 10 GPM, a 497 lb-in torque and 1021 max rpm.
By working the formula HP = 497 x 1021 / 63025, I should get a max of 8 HP, which of course I will not attain because the pump is not big enough. I will be happy if I can get 4 HP out of this mower.

I will be using a 30" deck, and the work to be done consists of cutting twigs no bigger than 1", but mostly will be smaller than that.

What are your thoughts, am I totally out of the ball park area?

 

[aczlan]

How many PSI does your tractor put out?
The formula to find hydraulic motor HP is: GPM*PSI*.000583
So, 7.1 GPM * 2000 PSI (random number) * .000583 = 8.27HP.
Do you have pictures of your project? Looking at doing something similar to mount on our tractor to mow under the fenceline.

Aaron Z

 

[J_J]

A 30 in deck would probably require more HP that 4. Most of the 30 in Snapper decks use 12 HP.

I have a Troybuilt 33 in and it uses a 12 HP.

That hyd motor would have about a 2 cu in displacement, and give an rpm of 1050, at 10 GPM.

First thing, you need more rpm, upwards of 3600 rpm. You can do the belt/ puller using different ratios, but the torque would decrease. A 3 : 1 ratio would give 3150 rpm, and that is if you can provide 10 GPM. The pressure you develop will determine the torque.

 

[NCMau]

How many PSI does your tractor put out?
The formula to find hydraulic motor HP is: GPM*PSI*.000583
So, 7.1 GPM * 2000 PSI (random number) * .000583 = 8.27HP.
Do you have pictures of your project? Looking at doing something similar to mount on our tractor to mow under the fenceline.

The project is still at its infancy. I want to make sure that I get the hydraulics halfway straight before I start cutting metal and burning rods. I know basically what I want, that is the deck will be attached to a pipe and be placed on the forks. I choose the forks because most of the time I don't have the bucket mounted, and the forks only take few seconds to hook up. I will supply pics when I got it together.

 

[NCMau]

A 30 in deck would probably require more HP that 4. Most of the 30 in Snapper decks use 12 HP.

I have a Troybuilt 33 in and it uses a 12 HP.

That hyd motor would have about a 2 cu in displacement, and give an rpm of 1050, at 10 GPM.

First thing, you need more rpm, upwards of 3600 rpm. You can do the belt/ puller using different ratios, but the torque would decrease. A 3 : 1 ratio would give 3150 rpm, and that is if you can provide 10 GPM. The pressure you develop will determine the torque.

JJ you are probably right that 30" blade would be too much for this motor. If proves to be so, then I would scale the size of the blade to 22" or 20".

Another option I have is to use the onboard pump (4 or 5 GPM?). Before installing the PTO pump, the loader was operated via a valve selector. If I use the valve selector, the pump will be used exclusively for the hydraulic motor (except for the back lift pumping action).

I know... it's still weak, but I just wonder if this wouldn't be better option. The plumbing would certainly be simpler.
Yes I am considering increasing the speed with a pulley. In this case, speed would better than torque.

 

[NCMau]

I am trying to check this motor for functionality. Short of hooking to the hydraulic system, can it be checked out by applying air? I did this but nothing moves. I just don't know if a hydraulic motor can be moved freely. The motor is not corroded and it did contain traces of fluid.

 

[J_J]

Air might turn the motor, but I doubt it. You only get about 125 psi max with a home air compressor.

If you have a good hyd motor, just about any hyd pump flow will rotate the motor, as GPM is what determines speed of the motor.

The pressure is developed by the resistance of the motor to rotate against force.

1 GPM of hyd pump flow will turn a 5.0 cu in hyd motor at 46 rpm.

5 GPM----------------------------------------------------- 231 rpm.

 

[NCMau]

Air might turn the motor, but I doubt it. You only get about 125 psi max with a home air compressor.

If you have a good hyd motor, just about any hyd pump flow will rotate the motor, as GPM is what determines speed of the motor.

The pressure is developed by the resistance of the motor to rotate against force.

1 GPM of hyd pump flow will turn a 5.0 cu in hyd motor at 46 rpm.

5 GPM----------------------------------------------------- 231 rpm.

Thanks JJ. I guess I have to find out when it is connected to the system. I had another question about the inlet and outlet. They are not marked, does it make a difference where it is connected?

 

[J_J]

You need a continuous flow for the hyd feed motor.

You can get it from the PB port if the valve has one.

The flow should enter the IN port of the feed motor valve , and the hoses for the feed motor should be matched to the FWD or REV position using the work ports.