M923 a2

[RECTIFIER]

What type of fluid do I use to top off the power steering? Thanks

 

[R Racing]

I used type F automatic transmission fluid In mine .

 

[MtnSnow]

If clear oil colored it's standard hydraulic oil, If red it is usually just ATF and/or regular power steering fluid.

 

[MtnSnow]

Here is the Lubrication manual for the M939 series trucks which your M923A2 is.
View attachment M939 Lubrication Manual 6-1990.pdf

 

[RECTIFIER]

I used type F automatic transmission fluid In mine .

Thanks. I received another reply that said some use type F & others use hydraulic oil. My fluid looks like hydraulic oil.

 

[RECTIFIER]

If clear oil colored it's standard hydraulic oil, If red it is usually just ATF and/or regular power steering fluid.

Thanks MtnSnow. My oil must be hydraulic because it's not ATF.

 

[idbankrman]

I use engine oil in mine. Just 15w40

 

[Gunzy]

Lube order says use 10wt EO. But 15W40 should be fine also.