NJ TRUCK Posted April 5, 2022 Share Posted April 5, 2022 Looks like two of the same topics in a row. I have a 1978 Mack power steering box. There is a lot of play in the steering, when you move the steering shaft back and forth there is a ton of play. I am looking to have it rebuilt or replaced. I am unsure if it was factory or added after. So my question is, any ideas of a shop that will rebuild it or replace it? What should the ball park price be? I have it off the truck and will reinstall it. I am in the central NJ area. Only part number I can find is on top of the pump is 402893 if that helps. Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/69485-power-steering-gear-box-mack/ Share on other sites More sharing options...
mowerman Posted April 5, 2022 Share Posted April 5, 2022 One of mechanics told me while back our kenworths are around 1000 bucks rebuild. But we’re around 3000 miles from you . good luck.. bob Quote Link to comment https://www.bigmacktrucks.com/topic/69485-power-steering-gear-box-mack/#findComment-494524 Share on other sites More sharing options...
mowerman Posted April 5, 2022 Share Posted April 5, 2022 My DM has the same problem around 7 inches of play but it looks like outer bearing is most of it.. bob Quote Link to comment https://www.bigmacktrucks.com/topic/69485-power-steering-gear-box-mack/#findComment-494525 Share on other sites More sharing options...
mechohaulic Posted April 6, 2022 Share Posted April 6, 2022 8 hours ago, mowerman said: My DM has the same problem around 7 inches of play but it looks like outer bearing is most of it.. bob outer bearing ? meaning out put shaft bearing not the steering shaft u-joint? 7+- that's considerable play have you tried the fluid/ filter change yet. DM - sheppard box with outer rack and pinion adjuster. Quote Link to comment https://www.bigmacktrucks.com/topic/69485-power-steering-gear-box-mack/#findComment-494562 Share on other sites More sharing options...
mowerman Posted April 6, 2022 Share Posted April 6, 2022 No I haven’t done anything to it but when I move the steering column you can see the out shaft moving or at least that’s what it looks like when I get ready I was just going to take it off and bring it someplace but you’re saying they may be adjustable????? Quote Link to comment https://www.bigmacktrucks.com/topic/69485-power-steering-gear-box-mack/#findComment-494563 Share on other sites More sharing options...
mowerman Posted April 6, 2022 Share Posted April 6, 2022 In other words it appears to be moving around in that case not sure Quote Link to comment https://www.bigmacktrucks.com/topic/69485-power-steering-gear-box-mack/#findComment-494564 Share on other sites More sharing options...
mowerman Posted April 6, 2022 Share Posted April 6, 2022 And no I have not changed the oil in it how did you know it was power steering Quote Link to comment https://www.bigmacktrucks.com/topic/69485-power-steering-gear-box-mack/#findComment-494565 Share on other sites More sharing options...
mechohaulic Posted April 6, 2022 Share Posted April 6, 2022 racking the mental picture section of my brain. the manual box had the side adjuster, big sheppard had the adjusting screws top and bottom ; seems those two adjusters were for the pressure relief settings Quote Link to comment https://www.bigmacktrucks.com/topic/69485-power-steering-gear-box-mack/#findComment-494566 Share on other sites More sharing options...
mechohaulic Posted April 6, 2022 Share Posted April 6, 2022 2 minutes ago, mowerman said: And no I have not changed the oil in it how did you know it was power steering '66 DM with manual steering ;; don't remember one. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69485-power-steering-gear-box-mack/#findComment-494567 Share on other sites More sharing options...
mechohaulic Posted April 6, 2022 Share Posted April 6, 2022 i can't get the proper picture. one unit has a "hole "in the frame behind the box to adjust rack & pinion. manual ? i see the effects of the old age memory situations ; don't remember last nights dinner and seem to be forgetting yrs ago things also. also there is a combo that input shaft goes in=out alot if you turn steering wheel with unit off. Quote Link to comment https://www.bigmacktrucks.com/topic/69485-power-steering-gear-box-mack/#findComment-494568 Share on other sites More sharing options...
mowerman Posted April 6, 2022 Share Posted April 6, 2022 I’m sure my mind is slipping way worse but I still remember in detail shit I did when I was 3-4 years old but why not that’s the important stuff right Quote Link to comment https://www.bigmacktrucks.com/topic/69485-power-steering-gear-box-mack/#findComment-494570 Share on other sites More sharing options...
NJ TRUCK Posted April 13, 2022 Author Share Posted April 13, 2022 So, after some further research, looks like the right part number is TRW/Ross HF 642984 Quote Link to comment https://www.bigmacktrucks.com/topic/69485-power-steering-gear-box-mack/#findComment-495199 Share on other sites More sharing options...
mowerman Posted April 13, 2022 Share Posted April 13, 2022 I think that’s what I had in my cruise liner good luck.. bob Quote Link to comment https://www.bigmacktrucks.com/topic/69485-power-steering-gear-box-mack/#findComment-495216 Share on other sites More sharing options...
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