Hydraulic build for John Deer 850J dozer
 

Hi just thought I'd post a few pics of some hydraulic tinkering which will hopefully end up in a dozer build. Thanks to the many other members who have posted info on hydraulic systems. Tolerances at the moment are a bit hit and miss so I'm only going to make the one cylinder for now and do a bit of testing before I end up with a handfull of leaking cylinders.

Re: Hydraulic build for John Deer 850J dozer
 

Looks like a nice start!

Re: Hydraulic build for John Deer 850J dozer
 

I spent a bit more time on the build today. Resigned myself to the fact that this is going to take some time! A little more than I thought before I started. I'm going to blank the second function off and carry out some testing with the valve that is almost completed. Have to wait for some hose and a tap to arrive in the post.
Next on the list is a pump. Can anyone help me with the gear sizes of the smaller end pumps? OD and H. What RPM are the gear pumps run at?

Re: Hydraulic build for John Deer 850J dozer
 

I will keep an eye on this thread, good luck with your project!


What mill are you using?

Re: Hydraulic build for John Deer 850J dozer
 

Hi, I'm using a Optimum BF20 vario mill

Re: Hydraulic build for John Deer 850J dozer
 

gear size 10mm
thickness approx 3mm
rpm upwards of 6000
10 to 15 bar

Re: Hydraulic build for John Deer 850J dozer
 

Hi, can anyone help me with what a "realistic" speed of a 14.5:1 bulldozer should move at in meters/min or feet/min. I will start a new thread of the build under construction equipment soon but will keep this one for random tech questions