B2650 Hydro Noise

[KTuk4J]

I'm experiencing a loud whine, more so after lifting several heavy loads or digging with loader. It starts out quiet.
Fluids/maitenance good. 300 hrs.
From my eperience with any machinery, this is most likey casued by trapped air, however I'm not familiar with these machines.
Is there a releif valve or way to purge the air by bypass?
Thanks in advance.

 

[RCW]

Don’t know the use or service history of your tractor, but I would start with a fluid and filter change before anything else.

My BX has had fluid changes multiple times over the years. Each time it lessens the HST whine.

 

[KTuk4J]

Don’t know the use or service history of your tractor, but I would start with a fluid and filter change before anything else.

My BX has had fluid changes multiple times over the years. Each time it lessens the HST whine.

As metioned, fluids/maintenance good.

 

[Russell King]

As metioned, fluids/maintenance good.

What type of fluid is in it? The synthetic UDT is supposed to help quieten the whine down

 

[North Idaho Wolfman]

There is no way to purge the air out of it.
If it's entraining air into the fluid, you either have contaminated fluid, cheap fluid/wrong fluid, a bad/cheap filter, or damage to the suction side of the system.