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Old 06-07-2022, 12:00   #1
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Transmission oil cooler change Perkins 4108 w/ Hurth Tranny

Hi All,

I recently pulled the dipstick to my transmission to find a chocolate milk substance where transmission oil should be. I believe the oil cooler failed, so i've purchased a new one and it's ready to install. I bought an oil pump to pump the old transmission fluid out through the dipstick hole.

Does anyone know the amount of transmission fluid to add back, and more importantly, do I need to add any additional fluid, to make up what would have been inside the cooler?

Thanks for any help!
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Old 06-07-2022, 15:31   #2
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Transmission oil cooler change Perkins 4108 w/ Hurth Tranny

Iíve only seen Hurth mechanical transmissions on the back of Perkins 4-108 ( not hydraulic Hurth) and they have an oil cooler just bolted onto the outside of the gear housing, just an alloy tank with an in/out hose. A failure into the oil side would have to be through the gear case itself , not just the oil cooler.
The often used Borg Warner transmission however does have an externally mounted tube type cooler that fails ( usually because the anode has dwindled) could your Perkins have this transmission?. If so, the capacity varies according to the configuration.....direct drive: reduction drive and vee drive. Hereís the recommended technique for checking oil level. Click image for larger version

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Old 08-07-2022, 06:02   #3
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Re: Transmission oil cooler change Perkins 4108 w/ Hurth Tranny

Dude, you gotta give us a little more information.

What transmission? There are almost a dozen different Hurth transmissions that could have been used. There is a label on the case if it hasn't fallen off. Or a photo of the transmission if it has.
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