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SA Hydraulics

D

Dellbertt

Member
Going forward in second gear - half throttle.
Lower the front cultivator bar and the gov kicks in as the engine bogs down a little.
Raise the fronts with no change the engine at all.
Same thing happens with the back section.
I cycled them several times in a short drive and they did it everytime.
Why does the gov kick in when lowering the hydraulics but not when raising.
Nature of the beast?
Dell
 
Does it lower slower than it raises? If so the hyd unit under the gas tank needs to be overhauled. My Super A does that, the governor doesn't kick in, but it might if it gets worse. In other words your hydraulics are putting an oversized load on the engine.
 
I put a kit in the unit on my C, up and down are the same speed, I can't tell the difference. I only use the 3 point with an adapter block, as opposed to the rockshaft, if that makes a difference. Almost any hydraulic unit will load the engine slightly, I haven't paint much attention to the governor, though.
 
It is the same speed going up and down.
Coming up it is smooth and quiet.
Going down the engine labors and the gov kicks in to recover, when all the way down the gov kicks out and the engine returns to normal.

***

If you want to test your gov operation put your tractor in next to highest gear, set throttle to a little over half then while moving ride the brakes hard enough to bog down the engine. You should here, see and feel your gov kicking in trying to bring the rpm back to where you had it set. Same thing when plowing and you run through some heavy ground.
Dell
 
I"m not familiar with the SA but this is normal for machines with constant displacement pumps and two-way open-center valves. When all valves are centered the flow of oil meets essentially no resistance and so the engine does little work. When you just crack the valve to lower the implement slowly the system goes on demand. Pressure goes up but only part of the flow goes through the valve to the cylinder: the rest is bypassed and the power (flow x pressure) goes to heating the oil. Open the valve wide to raise the implement and all the flow goes to the cylinder. Since the implement isn"t very heavy not much pressure is developed and so the engine doesn"t need to deliver much power.

Open the valve wide to drop the implement. Engine won"t load down. Crack it just a little to raise the implement slowly. The engine will load down.

Modern machines usually have variable displacement pumps.
 
Could be. Tractor is currently disassembled, going to put a kit in the hyd block it while it is apart. Have not looked at it yet.
 
I rebuilt my T/C block seven or eight years ago The tractor was running when I got it but pretty much a derelict, and it made a world of difference. I had everything hot tanked and did a good job of keeping everything clean as I went along. The improvement was remarkable, but from day one it's behaved like Dellbert's. I can lift a 650# back blade and she doesn't complain in the least, but she works letting it down. Speed both ways is alright, but the governor kicks the gas to it on the downstroke, even with no load on the rockshafts. Done it from day one after the rebuild. Might just be the nature of the beast.
 
Guys, I've been told that this is NORMAL. Both Cubs, the Super A, and the Super C do it here. Four tractors, all the same. I'd have to say it's pretty much normal.

Reason: Lowering an implement should be slow and controlled, so there is a restrictor in the "down" circuit.
 
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