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1977 R685


blackbelt5

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Can anyone tell me what power steering box will fit this truck. 1977 R685 I have everything but the box. My box mounts on the inside of the frame.Someone said Ross HFB70 but it looks like it mounts on the outside.Any help much appreciation. Thanks

[/quote

]Is the truck an RS or RD RS is usually on the outside of the frame RD on the inside!Usually ross on the outside ,shepherd on the inside!There were some ross on the inside as well in older trucks!

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fjh Not sure if it is a RS-RD RS but its mounts on the inside. Trying to fine a box that will work. Thanks

I assume you are looking for an integral power steering gear. That series of truck if using a Ross gear, (now TRW/Ross) will use an HF64 series gear. R.H. Sheppard gears were used but much less common of the R models in your vintage. I've only heard of one using a Sheppard, but never seen it personally.

The R685 series of truck is a standard R model with an inside frame mount steering gear. Be sure to also acquire the pitman arm for the steering gear also.

Rob

Dog.jpg.487f03da076af0150d2376dbd16843ed.jpgPlodding along with no job nor practical application for my existence, but still trying to fix what's broke.

 

 

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My old man worked at Mack in the parts dept. for 30 years.

He says the HFB70 box is a late 80's heavier box. You should require a SGP49.

part # 20QC4257P2

This is very true but the HFB70 series box will be quite a bit more costly and requires a little frame modification to mount. The existing frame will need two holes welded up and then reboring as the later gear has a different mounting pattern. The cost will be greater in the used market also. If the truck is to be worked it very well may be worth the extra cost and effort to install the larger gear as the HF64 always seemed to leak. I have three and they all leak.

Rob

Dog.jpg.487f03da076af0150d2376dbd16843ed.jpgPlodding along with no job nor practical application for my existence, but still trying to fix what's broke.

 

 

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I hope I wasn't misunderstood. The old man was saying the HFB70 box is NOT the right box for that series of R model.

The SGP49 is what it should call for made by ross. Mack part # 20QC4257P2

Hope that helps.

Edited by bbigrig
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