What's This??

Iplayfarmer · Apr 29, 2008

I'm working toward putting a loader on my Massey Ferguson 1215 tractor. I opened up the engine compartment today to look at the hydraulic pump and I've attached a picture of what I saw.

I've made notes on the image as to where the two output lines go, but what is the hex head cap that is nearest to the outside of the tractor? Is that a port where I could tie in hydraulics for the loader?

I was planning on just tying into the line that runs back to the 3 pt., but when I saw this I got my hopes up that there may be an easier way.

(P.S. Pay no attention to the date on the filter. I just got this tractor, and when I went in to the dealer this last weekend to get the filters for an engine oil and hydraulic fluid change they had to order them in.)

MReeb · Apr 30, 2008

Iplayfarmer, if you look at the link below it shows how you can connect a FEL to the pump. It doesn't explain what the nut is for on the pump but...
BushHog Parts Diagrams

RonMar · Apr 30, 2008

Well if that small line comming off the assembly below the nut is going to the power steering, then I would take a guess that it is some type of diverter/demand valve that only directs flow toward the steering when you turn the wheel.

Farmerford · Apr 30, 2008

I think RonMar is correct, with the small exception that the priority flow divider (in theory at least) is always directing a part of the flow (1 1/2gpm is a reasonable guess) to the power steering. It does that by varying the size of the orifice through which the excess fluid flows to the three point hitch, FEL, etc. When the front wheels are not being turned the 1 1/2 gpm flows freely through through the power steering valve because no work is being done at the power steering cylinder. But when the front wheels are turned the pressure of the fluid going to the power steering must build up (to turn the wheels) and in order to force the 1 1/2 gpm to continue to flow through the PS valve at higher pressure the orifice in the priority flow divider excess circuit (to the TPH) closes up to create the same pressure in the excess circuit that is required in the PS circuit to move the wheels.

Iplayfarmer · Apr 30, 2008

Farmerford said:
I think RonMar is correct, with the small exception that the priority flow divider (in theory at least) is always directing a part of the flow (1 1/2gpm is a reasonable guess) to the power steering. It does that by varying the size of the orifice through which the excess fluid flows to the three point hitch, FEL, etc. When the front wheels are not being turned the 1 1/2 gpm flows freely through through the power steering valve because no work is being done at the power steering cylinder. But when the front wheels are turned the pressure of the fluid going to the power steering must build up (to turn the wheels) and in order to force the 1 1/2 gpm to continue to flow through the PS valve at higher pressure the orifice in the priority flow divider excess circuit (to the TPH) closes up to create the same pressure in the excess circuit that is required in the PS circuit to move the wheels.

So, it's not some auxilliary port put into the design by forward thinking engineers that knew somebody would put a loader on one of these baby tractors and they wanted to make it as easy as possible?

Iplayfarmer · Apr 30, 2008

This actually brings me to another question...

If the flow divider diverts some of the flow to the power steering, does that mean that I don't have the full 4.8 GPM available to run implements even when I'm not turning the wheel?

kennyd · Apr 30, 2008

Iplayfarmer said:
This actually brings me to another question...

If the flow divider diverts some of the flow to the power steering, does that mean that I don't have the full 4.8 GPM available to run implements even when I'm not turning the wheel?

Probably not. You will have to dig deep to make sure. As an example, JD specs the machines this way:

Hydraulics

Type Open Center

Pump Rated Output, gpm (L/min.) 5.2 (19.7)

Steering 2.3 (8.9)

Implement 2.9 (10.8)

Pump Type Gear

Maximum Operating Pressure (PSI) 1987

Draft Control Type Select Control

Remote Control Valves Available 2

So at first glance, it appears to have a rating of 5.2 GPM, and the SINGLE pump does indeed have that rating, BUT, 2.3 GPM is diverted to the steering through a priority valve, leaving only 2.9 GPM available for implements.

Larger CUT's have multiple pumps for this reason. Like mine has 2-one for implements and one for steering.

RWolf · Apr 30, 2008

I believe my 5103 has two pumps but regardless I just checked today and mine is rated at ~18gpm. 2cents

I would think that 5gpm's wouldn't be enough? On my SCUT it's rated at least 7gpm. Curious???

YM-135trac · May 1, 2008

RonMar said:
Well if that small line comming off the assembly below the nut is going to the power steering, then I would take a guess that it is some type of diverter/demand valve that only directs flow toward the steering when you turn the wheel.

That would be my guess? But what is the plugs(your pic) under the "h" in "this" and above the last "?" ? Is that some kind of ports?