Need some help with my H please

JDMAN60

Member
I picked up a 1943 H a couple weeks ago that had been sitting for a few years. I got it to run really good but had no control of engine speed, Idle was great but if I moved the throttle it would run too fast. Last night I took the governor a part and the sliding sleeve was stuck. I cleaned and lubed it so it will slide now, but now I can't get the hydraulic pump to slide back on the governor shaft. Is there a trick to it ? I think the pump is turning keeping the splines from lining up.
Also this tractor has a lift cylinder on the right axle , when we had it running we checked to see if the hydraulics worked and they did. The cylinder moved out and exposed a vent hole in the cylinder and oil sprayed out. Is this normal? What kind of pressure does this system create? I assume it has a pressure relief valve, could I put a chain or some kind of stop so the cylinder won't travel that far? This is just a play tractor and I don't want to accidentally move that cylinder out anymore.
 
There is a small valve on the piston that is supposed to let any bypassed oil back in to the cylinder. It may be stuck. Easy to take the cylinder apart and check. The arrows on the outside of the cylinder must line up when you assemble it. Try moving the flywheel when you're putting the pump on to line up the splines.
 
Also make sure you have the mag off so when you do get the hyd. assy. on it doesn't break the mag. when you draw up the bolts because the mag coupling will not be lined up. Take the mag. off and out of the way.
 
The two Mikes beat me to posting this, and their info is spot-on, so I?ll add some other info.

There?s no pressure relief inside the ?H? Power Lift cylinder. The oil squirting out of your vent is from leakage. All the other Power Lift cylinders (for the ?A?, ?B?, ?G?) were internal and some leakage of the piston cup wasn?t a big deal. But since the ?H? has an external cylinder, Deere designed an oil recovery system that?s intended to capture leakage past the piston cup and to inject the captured oil back into the cylinder as it reaches full stroke. But for this recovery system to work, the cylinder has to be positioned correctly (if vertical, hose connection must be at the bottom, if horizontal, the cast-in arrows on the cylinder and rod cover sleeve must be on top). But this system had its problems and a little check valve inside this recovery system could be stuck open due to contamination and oil would leak anyway. If you have oil squirting from the vent hole, three things can be wrong: 1. the cylinder is out of position, 2. that check valve in the recovery system is stuck open, or 3. the cylinder cup is leaking so badly that the recovery system can?t keep up.

The Power Lift rated pressure is 555 PSI. The relief valve in the pump is supposed to relieve at around 675-720 PSI. At rated pressure, the cylinder push force is a little over 2000 LB. The flow rate is around 5 GPM and will make a full stroke of the cylinder (5-5/8?) in a little over one second. There is an unloading valve (Deere calls it a by-pass valve) in the pump that is intended to make operation semi-automatic. When raising, the control handle will stay up until the cylinder reaches full stroke. At that instant, the oil will start blowing past the relief valve nd this oil flow path is sensed by the unloading valve which then trips open and lets oil circulate freely inside the pump assembly. When the control handle is pushed down to lower the implement, it also resets the unloading valve for the next lift cycle. So the operator needs only to lift the handle (and let go) and the implement will raise itself and the pump will go into ?idle mode? after the cylinder extends full length. And to lower the implement, the handle can be pushed full down and the linkage over-centers and locks the handle down until the next lifting cycle is made.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top