Posted by jack in nb on September 30, 2009 at 11:47:56 from (156.34.211.153):
In Reply to: TO 35 hydraulic fittings posted by Mark from the fort on September 27, 2009 at 20:56:11:
If you lock your 3-point arms in the down position (there are bars available to do this - they are added to the three point drawbar and sway bars, and connect to either the brackets on the transmission below the top link assembly, or to the top link attach point) you can use the position control lever to control the loader.
A single line is run from a pressure port on either side of the front of the transmission cover, with a tee to feed both of the lift cylinders. The allen head plugs are standard pipe thread - forget whether they are 1/4 or 3/8".
The system pressure could be 2700 psi, so it's safest to use hydraulic fittings rather than the very much cheaper iron pipe fittings. They have a working pressure of 300 psi or so, and could rupture.
The single line will feed oil back into the transmission when the control lever is lowered, just the same as the three-point lift ram in the internal system.
Cheap and dirty, and works!
The next step would be a switch valve feeding a control valve to operate double-acting cyls or two separate functions such as lift and bucket tip. There are two- and three-spool valves that fit onto the top of the transmission to do this, but very expensive. It's cheaper to mount a switch valve on the transmission and feed an appropriate valve bank - ours is up on the loader right side, a bit below shoulder height.
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