GC2600 whining gone, then came back

[Dinico]

Hooked tiller up. Raising it with lift and driving with the load caused to oil foam. Was clear. Engaging the PTO for 15 seconds, then disengaging caused total foam in eyeglass.

Going to change out the fluid and get a new hydraulic filter.

 

[Dmacleo]

should suck DOWN with eng running. least my 2400 does, manual says too check level fel down, bucket curled down UP (edited to correct), 3pt lowered. with fel off and 3pt up low on glass (eng off) lower 3pt level is where it should be.
your eng running and level is right then eng off level low confuses me.

 

[Dinico]

Is the foam from the PTO gears turning in the oil? If pump was cavitating it would be happening all the time and not just when PTO is engaged.

I know that running the PTO on both the BX1850 I used to have and 2400H I currently have heats the oil up more than just driving around without PTO engaged.

It only foams when the PTOs are engaged. I'm not for sure how the PTO gears work inside the transmission. Are the PTO gears under pressure?

But the steel line #11 that connects to the PTO engage lever constantly whines. Almost screams. Whether engaged or not. The line isn't kinked.

Could it be blocked? Could it be related? Could it be the pressure relief valve? Or PTO valve?

FEL, steering, and 3pt lift cause no foam.

 

[5030]

Have not replied to this thread but I will say, one, its a sightglass, not an eyeglass and two, most all hydrostats whine to a certain extent, it's an inhereht characteristic of the transmission.

Far as the 'bubbles' or foam appearing in the sightglass, sounds to me like you have a compromised suction side hose or a failed suction side pipe going to the pump. Filters have nothing to do with causing foam unless they have a compromised sealing gasket. If it's a flexible hose feeding the pump, remove it and pressurize it with compressed air to say 30 PSI and observe it for air leaks and if it's a hardline, remove it and carefully inspect it for cracks or holes and if you find nothing, reinstall it with NEW sealing washers and make sure the fitting nuts are tight. Kubota's were notorious for cracks in the input hoes to the pump and they even issued a recall - fix for it.Most all quaility hudraulic oil will hava an anti-foaming additive in it to begin with. Cheapo hydraulic oil (fluid) like Tractor Supply Traveler fluid won't. Like everyting in life today, you get what you pay for.

 

[Dinico]

should suck DOWN with eng running. least my 2400 does, manual says too check level fel down, bucket curled down, 3pt lowered. with fel off and 3pt up low on glas (eng off) lower 3pt level is where it should be.
your eng running and level is right then eng off level low confuses me.

With FEL down bucket curled, 3 pt lowered, engine running, glass is middle.

Turn engine off, oil drops to below glass.

I released any pressure on FEL and 3pt, always do when getting off.
Then topped off the oil to middle. Took about 20-25 oz or so.
Start it up and then oil went above 3/4th.

Weird.
I repeated the same process. Oil at over 3/4 while running. Turn off engine. Goes down to slightly under half.

Where does the oil get pull into? Usually, I turn off engine and releave pressure in bucket and 3pt the oil in eyeglass goes up.

How much fluid does the hydraulic filter hold? This foaming didn't start until I changed that filter.

I'm at a loss.

 

[oldnslo]

It only foams when the PTOs are engaged. I'm not for sure how the PTO gears work inside the transmission. Are the PTO gears under pressure?

Gears are not under pressure but turning at high speed in the oil which could cause foaming or some aeration from splash. If you run PTO with engine at idle does oil foam?

Is foaming different when running rear PTO vs mid PTO? Different gears at different speeds so may have different results.

But the steel line #11 that connects to the PTO engage lever constantly whines. Almost screams. Whether engaged or not. The line isn't kinked.

Could be the PTO relief that is unstable causing vibrations in steel line. That could change with engine RPM, fluid temperature, etc.

Could it be blocked? Could it be related? Could it be the pressure relief valve? Or PTO valve?View attachment 3613818

FEL, steering, and 3pt lift cause no foam.

Try driving at full speed for a period of time with PTO off to see if oil shows any signs of foam. Reason for this test is to see if gears from transaxle may also aerate oil at full travel speed operation.

I doubt hydraulic problem since only happens with PTO spinning.

How long does tractor have to sit before oil is clear?

 

[Dmacleo]

does the 2600 come with backhoe? think not,think was 2610 had it, but want to check.

 

[Harry in Ky]

Now I'm curious about the line to the PTO valve and your description of the noise it makes. That can't be right. Does that line get warm to the touch quickly? That would certainly make me wonder what's going on in there.

 

[oldnslo]

Now I'm curious about the line to the PTO valve and your description of the noise it makes. That can't be right. Does that line get warm to the touch quickly? That would certainly make me wonder what's going on in there.

I am curious If the PTO relief is unstable would that steel line resonate? That would kind of explain working then quit but don’t explain why it became unstable. Also not sure if the PTO relief is constantly unloading a little flow or more of a pressure reducing valve maintaining a preset pressure to PTO circuit. Either way could be unstable..

 

[Harry in Ky]

I'm not at all familiar with that tractor, but many similar systems pipe return oil from the steering circuit through a pressure reducing or regulator valve maintaining 200 to 300 PSI. That flow is then used to supply hydrostat charge pressure, PTO, any other clutch packs or low pressure functions. I'm really wondering what's going on in that circuit?