Excessive Hydraulic foam

[selftot]

My dealer replaced the rubber intake line to the hydraulic pump. I think they were grasping at straws to deal with the jerky 3 point hitch.
I have not seen any foaming in 18 years until now. It bubbles excessively when I engage the HST pedal.

The obvious response is to take it back to the dealer and get them to fix it but I have concerns about their competence (for other problems). Still waiting for the manager to call me back. Next closest dealer is 6 hours and an expensive ferry away.

I’m considering removing the new rubber intake hose for inspection and cleaning of surfaces before re-install.

Anything else I should look at first ? Is there a good way to test the (new) rubber intake hose itself ?

Oil is clear after starting tractor but looks like this after driving 20 ft. It looks bubbly and cloudy but go clear again after sitting.

 

[Fedup]

You might start by tightening the hose clamps on said rubber line. That's cheap, simple, and could make a difference.

 

[selftot]

Good call. These have always been spring clamps. Maybe i should put worm drive clamps.

 

[Jsjac]

If there is enough space I would put two cla.ps per end

 

[number two]

Wasn't there a recall/updated hose near the left center of the tractor that would crack and suck air?
And I seem to recall many jerky 3pt complaints that were never resolved.
Good Luck!

 

[Kennyd4110]

These have always been spring clamps. Maybe i should put worm drive clamps.

Spring clamps provide constant tension, unlike worm clamps. They are better is some cases, but not all.

The foam indicates that air is being sucked in somewhere, have you checked around the filter seal?

 

[selftot]

I added extra gear clamps and some grease around the hose interface to block air.
No improvement.

Is it normal for the level in the site glass to drop when the hst pedal is pushed? The level drops and oil gets bubbles. That cant be normal...

Other ideas in my head - maybe i should bypass the valves the dealer installed for 3rd function and rear remotes.

 

[selftot]

What is the best way to test for intake leaks (without expensive equipment).
I read that foaming Dawn dish washing liquid with a bit of glycol is effective and safe.

 

[North Idaho Wolfman]

What is the best way to test for intake leaks (without expensive equipment).
I read that foaming Dawn dish washing liquid with a bit of glycol is effective and safe.

Why would you think soap would make a good suction leak fluid?
It's not like it's going to blow bubbles?
There is no quick intake leak detecting fluid!

If you have that large of a suction leak, wherever it was leaking would be wet when it's not running.

I bet they hooked up a remote or the third function improperly and that is causing flow issues.

 

[selftot]

Why would you think soap would make a good suction leak fluid?
It's not like it's going to blow bubbles?
There is no quick intake leak detecting fluid!

If you have that large of a suction leak, wherever it was leaking would be wet when it's not running.

I bet they hooked up a remote or the third function improperly and that is causing flow issues.

Bubbles would get pulled in. Apparently.

I have a separate thread about the new valves. It was suggested they would not cause foaming. But maybe I documented the setup wrong. I’ll go take another look at the plumbing and report on the valve thread.

 

[selftot]

I bypassed the 3rd function, rear remotes and backhoe is not attached.
Retraced the plumbing to confirm diagram below.

When forward is applied to HST pedal, oil level drops below site glass bottom and foams
When reverse is applied to HST pedal, oil level rises and foams.

I never monitored the level that closely before but i pay enough attention to know there has never been foam at startup or at the end of the day. Not sure what the dealer might have done...

There are no oil leaks. No spills on the floor where its parked.

How can I check for leaks in the low pressure suction lines to the pump ? Or am i looking in the wrong place.

Thanks for any tips.

 

[selftot]

I decided to snug up the hydraulic filter a bit more.
It was tighter than i put it on in December (contact plus 2/3 as per instruction)
The shop gorilla must have had a go at it. I tensioned it correctly again but maybe the seal was damaged.

 

[whatsupdoc]

Water in the oil will cause foam.

 

[selftot]

Water in the oil will cause foam.

Thanks - the oil clears up after sitting for an hour. Tiny bubbles

I went thru the dealers invoice line by line. Turns out they also replaced these 2 0-rings. Just throwing parts at a theory. (their theory was air intake causes jerky 3pt)

I'll test this tomorrow with grease unless there is a better idea.

 

[North Idaho Wolfman]

Again if any of the suction fittings are leaking then they should be wet after sitting for a while.

Oh and i think your barking up the wrong tree.
Run the loader up and down and the three point up and down without moving the tractor and see if it foams.
If it doesn't then you are 100% barking up the wrong tree and you need to look at the plumbing for the HST not the hydraulic system.