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Mith · 01-06-2009, 07:21 PM

Bob, at the moment I'm really just looking to gain a bit of information rather than copy the PTs system specification.
I might be wrong, but I believe that the PTs only have one PTO circuit that is used for all the attachments, so I would suspect that the flow from that PTO is a compromise to fit as many attachments as possible. I'll be doing the sums as you suggest, probably even working back from the HP requirements for different sized mowers, but knowing the specs of the motors used on the PT attachments gives me a good grounding to work from.

JJ, the machine has 31HP, and it is set up so that the drive is capable of using nearly all of that (I believe about 25HP at full flow and pressure).
However, while using a mower I wont be going at full speed (~10mph) and it wont be running at full pressure so I'll have more HP available for attachments.
I'm thinking about the possibility of getting a larger motor that runs at 540rpm and attahcing that to the back of the tractor and using standard 3ph attachments with a PTO shaft, I can always add a diverter if I want to use that flow for a boom mower or something.
There is alot of possibilities and I havent really decided what I want to do yet.
There is an argument to adding a high flow pump that is capable of using the full 31HP, and sizing the attachments so that there is enough HP left over for drive. If the attachments need more HP I can just slow down on the drive.
That would also allow me to use the full engine HP through the PTO when the machine is stationary.

Thanks guys, its interesting to hear your thoughts on this. I dont have much experience with hydraulic driven mowers so its good to hear from those that have.

01-06-2009, 07:21 PM	#12 (permalink)
Mith Veteran Member Join Date: Nov 2004 Posts: 1,157	Re: Mower deck hydraulic motor. Bob, at the moment I'm really just looking to gain a bit of information rather than copy the PTs system specification. I might be wrong, but I believe that the PTs only have one PTO circuit that is used for all the attachments, so I would suspect that the flow from that PTO is a compromise to fit as many attachments as possible. I'll be doing the sums as you suggest, probably even working back from the HP requirements for different sized mowers, but knowing the specs of the motors used on the PT attachments gives me a good grounding to work from. JJ, the machine has 31HP, and it is set up so that the drive is capable of using nearly all of that (I believe about 25HP at full flow and pressure). However, while using a mower I wont be going at full speed (~10mph) and it wont be running at full pressure so I'll have more HP available for attachments. I'm thinking about the possibility of getting a larger motor that runs at 540rpm and attahcing that to the back of the tractor and using standard 3ph attachments with a PTO shaft, I can always add a diverter if I want to use that flow for a boom mower or something. There is alot of possibilities and I havent really decided what I want to do yet. There is an argument to adding a high flow pump that is capable of using the full 31HP, and sizing the attachments so that there is enough HP left over for drive. If the attachments need more HP I can just slow down on the drive. That would also allow me to use the full engine HP through the PTO when the machine is stationary. Thanks guys, its interesting to hear your thoughts on this. I dont have much experience with hydraulic driven mowers so its good to hear from those that have.