Yanmar 240D Hydraulic intermittent total fail to lift

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Steve Kiblinger
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Yanmar 240D Hydraulic intermittent total fail to lift

Postby Steve Kiblinger » Mon Jun 15, 2020 10:31 am

I am stumped - :?:
At start-up my front loader and rear Woods brushhog will not lift - after (sometimes) days of retrying the controls the system will work and sometimes continue to work for days?

I have cleaned the filter at the bottom of the rear drive gearbox and changed the 4 gallons of John Deere hydraulic oil twice... The only other anomaly seems to be a general weak & slow speed movement of the loader... The rear attached Woods brushhog moves fast and robustly... Both systems fail together...

Your help please... :!:

Aaron
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Re: Yanmar 240D Hydraulic intermittent total fail to lift

Postby Aaron » Mon Jun 15, 2020 12:01 pm

Do you have any quick disconnects in your system that could be failing to open completely? Is you loader plumbed like below?

Image

Steve Kiblinger
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Re: Yanmar 240D Hydraulic intermittent total fail to lift

Postby Steve Kiblinger » Mon Jun 15, 2020 2:22 pm

Thanks for your Reply Aaron:

The unit is plumbed per the diagram... I only find a manufactured hose break in the suction line and no quick disconnect in the pressure line...

While waiting for your consideration, I opened one of the two lines noted in your diagram that go to the loader... The engine was running and high pressure air followed by fluid came out of the cracked connector...! :D

The front and rear tools now move with the loader still yielding lazy action...!!! Now, what is causing the air lock?... Steve with the curious mind 8)

Steve Kiblinger
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Re: Yanmar 240D Hydraulic intermittent total fail to lift

Postby Steve Kiblinger » Mon Jun 15, 2020 2:33 pm

This is where we sit:
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Yanmar 2.jpg
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winston
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Re: Yanmar 240D Hydraulic intermittent total fail to lift

Postby winston » Mon Jun 15, 2020 5:16 pm

Air would come in on the suction side only. Fluid level correct? Check suction line starting at transmission and going to pump. Especially the rubber hose.

Steve Kiblinger
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Re: Yanmar 240D Hydraulic intermittent total fail to lift

Postby Steve Kiblinger » Mon Jun 15, 2020 7:42 pm

Thanks Winston,
We will check suction side closely... Will be a few days before I get back...
Steve

BTW: The suction side is dry all the way to the pump and the rubber hose coupling seems intact... I will check the clamps for security more closely...
The book says 4 gals of fluid... I put 4 - 1 gal jugs in and the dipstick says it's full with the stick just siting on the case opening...


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