My F-1700 testing my patience

[stevewatr]

Rather than start a new thread, I figure I'd try and revive this one with my problem.

My Ford 1920 (Shabura) tractor 3 point hydraulic lift has a ghost in the machine.

When it works, it has no problem lifting a heavy brush hog, and I do not have any issues with jerky lifting, or sudden dropping. The knob in front of the seat that controls rate of fall work perfectly.

Several times now I have encountered a strange issue where the lift 100% stops working. This never happens when working the tractor, only with initial start up.

A couple times I found revving the engine "woke up the hydraulics".

I'm not positive, but I think cold weather is a common factor when this occurs.

And when I say it doesn't work, I mean nada, zilch, zip. lift lever moves easily and has no effect. And since it is at startup, the impliment is on the ground, so there is no weight on the arms (I always lower the impliment when done for the day)

Well the intermittant issue has apparently decided to stay broken.

Fluid level is good, no strange noises as far as I can tell over the diesel noise.

Could a failing cylinder seal start off with intermittant failure like this? Or would a sticking relief valve be more likely?

 

[JC-jetro]

The cylinder head for he lift system has a main bypass back to the difffy. This thing has a stiff pressure and a ball check valve. That would work the same as relief pressure device on the pump discharge circuit before fluid is routed to lift spool on it's way to lift piston head. Those two areas can be suspect. Need to verify also when the system does not work if you have flow passed the spool. I had a ton of pics with this thread that was hosted on a another site rather here and it was lost due to not renewing the subscription. On the right hand of list cylinder head from driver position there is a cap that if you open can verify if the pump is actually working or not. I ended up overhauling my hyd pump that I am sure you can find info about it here at this Site.

JC

 

[stevewatr]

The cylinder head for he lift system has a main bypass back to the difffy. This thing has a stiff pressure and a ball check valve. That would work the same as relief pressure device on the pump discharge circuit before fluid is routed to lift spool on it's way to lift piston head. Those two areas can be suspect. Need to verify also when the system does not work if you have flow passed the spool. I had a ton of pics with this thread that was hosted on a another site rather here and it was lost due to not renewing the subscription. On the right hand of list cylinder head from driver position there is a cap that if you open can verify if the pump is actually working or not. I ended up overhauling my hyd pump that I am sure you can find info about it here at this Site.

JC

Thanks for getting back to me. I was wondering why all those photos did not load, too bad they were lost. I was already thinking my pump is probably okay, just based on the intermitant nature of the failure. My experience with hydraulic pumps is that they loose pressure over time as they wear, or have a catostrophic event they don't come back from.

Is the cap you mention under the seat mount? There is the fill cap to add fluid located at the rear between the lift arms, and a small cap with dipstick attached on the floor up towards the dash/cowl.

But it sounds like you mean something else?