Tractor Backhoe Drooping in under 5 hours, rebuilt cylinders, no leaks

[TWD]

Kubota wisdom! I have a question...

My Kubota M59 has approx 1000 hours on it (purchased new), overall, great machine, only issues were common (well, noted on this forum) with the backhoe randomly swinging left\right and then my caused issues from heavy use or heat.

This question is in regards to the backhoe, specifically why it's bleeding down in around 5 hours?? The boom cylinder is bleeding off and the bucket is on the ground in under 5 hours.

I had the dipper cylinder rebuilt 2 years ago as it had a slight seal leak, and then this year I had the Boom cylinder rebuilt from the same issue. The cause was my own fault, over-using the backhoe for 4+ hours in 100* weather w\out aux cooling, and semi-clogged radiators... (my assumption, maybe not true).

Anyway, the tractor\backhoe works functionally perfect, does not leak out of any cylinder or hose, can be parked in the same spot for weeks with no fluid on the ground at all.

So why is the backhoe bleeding enough that it's drooping in very short time period?
Bad or stuck check valve? Can I buy this without buying the entire $700 valve like I did for the left\right swing issue or is this another part?

 

[Rosher18]

Possibly leaking through the spool valve back to the reservoir/transmission?

 

[4570Man]

Bleeding down in 5 hours really isn’t a big deal and it may still do it after repairs. Use the boom lock and don’t worry about it.

 

[bdhsfz6]

That is about the same bleed down time as my BH92 hoe. Kubota is notorious for leaky spool valves, so don't necessarily blame the cylinders.

 

[Carl_NH]

Yep - its normal on my little TLB too after 5-6 hours its on the ground - so mine is either pinned up or I put it down when I park it. It's 24 years old now so doesn't stay up as long as it used to.