Engine and Hydraulic Fluids for case 448?

This can be a somewhat loaded question, but, for simplicity sake, I recommend looking at the owners manual for your vintage of 448. In general though, if your 448 still has the Onan engine, SAE30 oil is good for warmer weather use, 10W30 for winter use (if the machine is stored in an unheated space). Case prescribed 20W40 for The hydraulic system but since that’s hard to find, many use Shell Rotella 15W40 oil in the hydraulic system.
There are plenty of threads on this site about oil and they can make for some interesting, informative and sometimes entertaining reads…..

Thank you very much. I’ve seen the varies threads and had a good chuckle. Really appriciate you taking the time and to help me out.

Onan did market a 15W40 engine oil called Onamax. I only have one Onan powered machine at this time which is an Ingersoll 6018L. As I don't put much time on it, I switch it to 10W30 in the fall and back to 15W40 in warmer weather with out changing the oil filter. When I do use the 6018L I work it hard which I will be doing again soon. I will switch it back to 15W40 before the upcoming jobs. 15W40 stays in the hydraulic system and transaxle year round. I do let it warm up prior to using it regardless of the season.😎

Sorry but the answer always needs a question answered... Do you live in a climate that gets cold in the winter? I.e do you get snow? In that climate you have basically two options for the hydraulics - change the oil to the season or pick an oil that has a viscosity that spans the whole season. Case recommends 5W-20 for winter season and 15W-40 for summer. For me that basically sucks! I use 5W-50 synthetic in the hydraulics summer and winter. If you live far south where temperatures are above freezing then that's different. I use Mobil 1 5W-50 in my system summer and winter and change my oil out every 3-5 years!

Oh BTW I have just ordered 5 Quarts of Mobile 1 5-50 from Amazon for $24 dollars!!! It will last probably 5 years! yeah less than $5 per year! how much are you spending changing out conventional oil every 6 months or so?

Hu Go said:

Hi all,

I just rebuilt the engine and changed all the hydraulic lines. Just want to confirm that the same oil is used in the hydraulic system as it is in the engine?
if not can someone confirm what is used in the hydraulic system and what is used in the engine b48m?

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From Manual Attached.

That is great to know. I will get some for myself. Currently ran in to an issue with the carburetor. I put in an electric pump and everything but the gas isn't going through to the cylinders i’m at a loss.

Hu Go said:

Currently ran in to an issue with the carburetor. I put in an electric pump and everything but the gas isn't going through to the cylinders i’m at a loss.

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Does your engine have a Marvel-Schebler DD series carb (the type with the built-in fuel pump) or is it a later model with a Nikki carb & separate pump?

If it has the Marvel-Schebler carb, remove the top (4 screws) and take a look at the float. They originally used a composite type float that can crack, swell up, and then rub on the side of the float bowl. Rubbing on the side of the bowl can cause the float to stick, holding the inlet valve shut, and preventing gas from entering the carb.

I had that happen on my 446. I fixed it by replacing the old cracked/swelled float with a new brass one.

Ray, totally agree. I had exactly that issue with my 1977 446 but also found I had to replace the valve membrain and a number of other things in the carb too. I ended up doing all those upgrades before I blocked off the fuel pump0 in the carb and moved on. Ended up with fitting a low pressure electric pump to the system and never looked back. I know others bought and fitted an external pressure pump too.

Lots of info here When You First Get Your Tractor Home | Case Ingersoll Tractors