how should I flush hydraulic fluid?

[ray66v]

Yes, of course, you will need to take one end loose of some cylinders.

It's not going to be anyone's idea of fun.

I would be surprised, if 120 psi would not move the FEL on my subcompact. Especially, if I took the bucket off.

Actually, if you ran the FEL up with the engine, and started with it in the full up position, and full curl on the bucket, you could use gravity to push most or all of the oil out.

You will need to let air suck in on the suction side, and be careful bleeding it down.

 

[Coyote machine]

Thanks Luke,
I am just trying to help come up with a simple solution that might work, with possibly less risk of flying oil and disconnecting a bunch of fittings, etc. It doesn't seem that's too likely from what all has been stated so far. Maybe the opposite approach might make headway- what about using a vacuum pump type approach to suck out the fluid instead of pressure to push it out? That's what is used to clean the AC lines in refrigeration systems before adding freon. I realize we're talking about a gas in refrigeration instead of the liquid in the hydraulics, BUT each is able to flow, by either being pushed (by pressure) or pulled (by suction).

Kiotidriver: the OP doesn't have a tractor with dirty HST fluid. What he has is a tractor with new transmission fluid and a new used backhoe that has dirty hydraulic fluid.

From my POV, if one changes the hydraulic filters on a regular basis, and there is no entry into the hydraulics of water, or other contaminants, then the fluid can remain viable for way longer than the manufacturer's recommendations. I have run my DK-40's original HST fluid since day one for over 850 hours of use, including my Kioti backhoe that had run over 350 hours on my prior Kioti DK-35. No problems whatsoever. At the next filter change I do plan to change the HST fluid for the purpose of seeing it's overall condition, and seeing what is evident on the drain plug magnets.Otherwise, I take my selling dealer's recommendation and not worry about HST fluid changes so long as I maintain the filter change intervals.
YMMV.

 

[Kiotidriver]

Hi Coyote Machine. I would like to apologize for having misstated the OP issue, and thank you for correcting me. I'm surprised that you have kept the same HST fluid in your tractor since you got it (I'm assuming since it was new). Kioti recommends replacing all fluids after the first 50 hours of operation, and then every 200 hrs for the transmission fluid. You are stating that your decision of not changing the fluid at recommended intervals is based on your dealer recommendation. What makes you believe that your dealer knows your tractor better that the Kioti engineers who designed it? Personally I would stick with the manufacturer's recommendations for service schedule.

 

[Soundguy]

If a pinned cyl is an issue, un pin..

 

[Luke'sScreenName]

If a pinned cyl is an issue, un pin..

:duh::duh::duh::duh::mur::mur::mur: