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Thanks for all the info! Reservoir ordered, I'll probably order new hoses too as I think they are original. Bleeding process is helpful, and with me changing 3 things at once, I'll have no idea which thing fixed it (fingers crossed it is fixed).

I'm wary a large reservoir will cover up a separate problem (hand pump would empty when I had the AOP and AOP reservoir would overflow) but it wouldn't hurt to have some extra volume. $42 for a larger reservoir-double the capacity. I'll give it a shot and I'll also try to bleed out the air in...

After raising the cab all the way, I've been able to use the tire hoist just fine, indicating enough fluid. Maybe I do have air bubbles messing this whole thing up. I removed the balls/springs from the tire hydraulic a while ago as I often had issues with them locking. They do make a reservoir...

I'm really not following. It has more than enough volume to raise the cab, so when lowering, that same volume should return to the reservoir. Instead I'm getting more back than I pumped out. I really think there is another issue here, as when I had the AOP, the hand pump would become empty and...

Not for when the AOP is removed.

Reservoir volume is .6 liters (20.3 fl oz) I am able to tilt the cab and lower the spare, then raise the spare and start the cab coming down. If I manually pump while the cab is coming down, it does not overflow. It seems very odd to me, that I can lower the cab, the reservoir overflows, then I...

Yes, hand pump is vented to atmosphere with the specified venting cap from the manufacturer. Yes AOP lines are capped.

From the diagram, it sure looks like it should pull from the reservoir. Even if the return pickup is high, it should pull fluid before overflow can happen. Check valves don't look they would be in play at all. I wonder if the cab latch may have a leak under vacuum as it could pull air from the...

Had this problem for a while now, with two different pumps. When lowering the cab (allowing gravity to do it slowly - no pumping on the way down) I get hydraulic fluid pushing out the vent plug. It will do this on successive raise/lower cycles until it pushes out enough I can't even raise the...