Hydraulic oil contamination from rented equipment

[traktorz]

We have a 3-ton trailer with an electrical winsch on an arm, that has been used with our former tractor, a Ferguson TEA-20.
For bringing wood to the local sawmill, I am considering to borrow/rent a bigger forest trailer (~5-7 ton) with a hydraulic lift.

A neighbour has an old trailer, that could do the work, however it's been standing unused for some years. Having a new tractor with ~70 hours and with clean fluids, I'm hesitating to connect the hydraulics right away.

I've heard that the biodegradable hydraulic oil clogs and sediments if unused for some time. I don't want to dilute the quality mineral oil in our 27 liter hydraulic system either. Is there a way to rinse the old trailers hydraulic system, before connecting it to our own new tractor? Or should I attach an inline filter (if those exists) to the return hydraulic quick connector? If so, how?

Foton FT404 spec:


Foton FT404 hydraulic quick connecors:

[jeep]

they make a hyd filter base with the spin on filter that you can put quick connectors on the in and out so you can put wright inline Jeep

[linus69]

Northern Tool has them in 20GPM and 35GPM

www.northerntool.com/webapp/wcs/stores/servlet/product_6970_12006_12006

www.northerntool.com/webapp/wcs/stores/servlet/product_6970_25131_25131

Paul

[psj12]

While the filters will stop particulates from the old oil they will not stop the organic oil from mixing with the mineral oil. If the lift cylinder on the trailer is removeable it could be operated with air pressure to flush the fluid from the old system. Remove the quick disconnects from the lines on the trailer and blow them down with compressed air also. This should remove most all the contaminated oil from the old trailer.

After hooking up your tractor and operating the dump several times to get the air out of the system don't forget to top off your tractor fluid.

[traktorz]

Thanks for the replies with suggestions.

We have now taken one step further on this topic regarding a hydraulic return filter.
We have purchased a spin-on filter with a holder (containing a bypass valve).
In Europe BSP is the standard, so the filter is a Baldwin BT366-10.
(In US NPTF is the standard, with an equivalent BT839-10).

To my knowledge, the only connectors on our tractor that isn't Chinese millimeters are the ½” Quick Disconnect Hydraulic Connectors. Our next step is to get an adapter to fit between the 3/4" BSP (filter holder) and the ½” (QD).