This was a very interesting thread to follow.
@Russell King Just to clarify for me - are you saying that the vendor supplied 90 deg fittings that were actually restrictors?
FYI, I've been looking into installing restrictors on my backhoe to slow down the boom (which would be mounted in the cylinder control lines.)
I ain't no expert running a backhoe and the controls on the BT900 are quite fast for a little control stick throw.
I saw these restrictors on the Tractor Time with Tim video.
The vendor was Fit Rite Hydraulics.
They supplied four total fittings with the restriction in each fitting. There were 2 straight and 2 90 degree fittings supplied. All of these fittings were supposed to be installed in the lines between the valve and the double acting cylinders (top and tilt), which have limited GPM flow through them.
The fittings were not marked or painted with any obvious markings. I assume they do have a part number stamped on them but I can’t see it with my old eyes. The straight fittings are easy to look through to see the bore, the 90 degree fittings are NOT easy to identify. Light will shine through the small holes but you have to work with a good amount of light and pay attention and have good eyes. I should have used something to mark them when I removed them from the bag that they were shipped and identified in.
I recall that I took them out of the bag and used them to conf what threads were in other locations. I know I bought fittings that were the same threads and shape without the restrictions in them. So I had fittings that were basically identical to the eye but with different holes for the fluid to flow through.
When I installed the fittings onto the cylinders and the tractor two 90 degree fittings were installed in incorrect locations. One with the small hole was installed in the line from the hydraulic pump output to the rear remote valve. The full flow of the pump (4-5 GPM) had to flow through the small hole so the pump was at a high pressure since it is a positive displacement gear pump. (I don’t have the formula handy but there is a formula that relates flow to pressure through an orifice and another that relates the pressure and flow to the horsepower required). That is something like a deadheaded pump (that can destroy the pump or something else in the line).
I know that you can order the fittings with the orifice hole from many vendors and your video named one of them. That fitting appears to be an additional fitting that was straight and selected to be easily installed on the end of a hose that has JIC female swivel ends. That should work in many places on many tractors but you need to know the correct size of the fitting and hose threads before you order the orifice part. What I have are actually directly into the cylinder and the hose connects directly to the fitting.
It will slow down the movement of the cylinder after a control valve. In that video I think the control valve (Summit?) on the first tractor (rear tilt) is an electrically controlled valve. That is either on or off like a light switch. That gives the operator very little control of the cylinder especially when the cylinder has little travel.
i will take a look at that in the AM
