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I want to replace these Trans. oil cooler lines. Looks like I’ll have to have them fabricated at a local shop. My question is when I disconnect the fittings am I going to get a lot of fluid coming out of these lines? And when I put the new ones on, is there an issue or concern with air in the lines? Do I need to do anything special or just top off the tranny fluid and start the engine?
Thanks
PS.- Engines are Cummins QSB 5.9 with ZF80-IV V-drives.
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Replacing Transmission Oil Lines
As Justin said, not to worry about bleeding them. That will take care on itself. Check your oil level after running at the dock for a minute of so.. DO NOT over fill.. “MORE IS NOT BETTER”
At the Hyd shop– Just use Hyd Hose rated to R1, #6 or #8 size ( does not really matter, but #6 is easier to route) . Your cooler circuit on this particular gear runs below 50 PSI, but you still want high-pressure hose for “safety” and ease of connections.. …
You do not need ” Blue” Aeroquip or Parker hose unless you “like the color”. Plus both of those hoses are rated “less” that common R1. Standard “crimp” or swage fittings work great– Gear Cooler side in typically JIC/SAE #8 swivel, and the gear side 3/8″ NPT. Just matching what you have now is usually the easiest
Tony
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I have installed and plumbed several of these in our shop. We don’t do anything to “bleed” the air out of the cooler or anything… I think that’s what you are asking. About all we do is fill the gear totally up to the full line and check the gear oil after warming up and running a bit.
You will get some draining out of the cooler when you take off the hoses, have something absorbent nearby. In my experience its usually not a lot. Most usually seems to drain back into the gear.
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