Hello, this is my first post other than my intro post.
Ok to start a little background.
I am basically a person that if I’m not staying busy with a project, I’m bouncing off the walls. I stumbled across a 1985 JD 116H that was going to be crushed for the scrap weight. I asked what was wrong with it and they said it wouldn’t move anymore and the lawn mower mechanic said it was shot. The motor worked so I bought it from them for 40 bucks. Turned out the brake wasn’t disengaging because of a weak spring. Works great now, I think the mechanic was trying to get them to buy a new one which I guess worked. I had it going in 10 minutes once I got it home. I have been using this for a normal rider and occasionally a food plot tractor to mow off the clover or trash.
Well my food plots are really hard to get at because of water crossings, trees ect..., a garden tractor is the best size but a two wheel drive needs to be trailered in with an atv. This is how everything is done now but the atv is not perfect for tilling and the JD only mows off the trash. It is hard to keep the atv at 3 mph. My hand and wrist feel like a ball of cramped muscles at the end of the day.
This got me to thinking of building a garden tractor size 4x4 articulating tractor. I have found a JD 318 with a bad hydrostat and a motor that burns oil like its gas. When the snow goes he said I can have it for 200 bucks. This should be a good parts tractor. I am going to build a frame to fit the hood and steering pod, tires ect.
On to my question…
I decided to make the drive all hydraulic, not gear or hydrostat. The fluid will be sent through steel lines rather than rubber hose other than at the pivot. I attached a pdf of the potential drive system. This is my first attempt to work with hydraulics so be kind. It will have 4 drive motors, 3 directional valves, a flow control valve, divider/combiner valve ect.
The pump is a 22gpm at 2000psi/3000psi max, the motors are 15gpm - 1850psi – 2950 in lb torque – 304 rpm. The pump will be giving 16gpm max to the drives essentially cutting the rpm in half and a quarter in low gear, the remaining 6gpm will drive the steering and hydraulics for equipment. The directional valves are all 12 volt directionals and the flow control will be similar to a flow control valve on a belt bottom potato box. I found a 26hp briggs and Stratton to power the system so the hp shouldn’t be an issue.
What do you think? I might not have the symbols correct in the pdf, my first shot at it. With this set up I figure my top speed with 24 inch tires will be just over 10 mph in high gear and just over 5 in low. More than I need. But I am wondering if this will pull properly or if I’m starving the motors for gpm.
Any knowledge thrown at this project is appreciated.
This project will be a go as I have time deal but I will be posting updates as I go.