David Cron

Hello all, I contacted Allison and was informed that the part I am looking for is not any part for the Allison shift as it is completely electronic controlled by internal solenoids per Allison. They have informed me the part in the picture mentioned is actually the control valve for the parking brake. When the park brake is applied by cable, the hydraulic flow is shut off utilizing spring pressure. This flow is from the power steering system and is activated with the engine running, when the parking brake control cable is pushed in to release the parking brake. After researching where the hoses went from the valve, they go to the p/s reservoir, p/s pump pressure and one to the hydraulic motor that controls the parking brake apply and release. When I checked the level of the p/s reservoir, I found it about 2 quarts low. I still need to find this valve however, so the hunt is on now starting with Magnum Chassis, unless one of you greats have any ideas or recommendations. Thanks for all your alls help.

No I have not called Allison yet. But it was.But that was my next move. Thanks guys

Looking for this part in the lower picture. 1996 Beaver Monterey M3060 Allison Transmission. This is the valve that shifts the transmission from N, D, R Need a part number, what it is called and maybe where I can get it. Thanks

Sorry for this late addition for the above belt question and Rayin’s comment, I was able to secure a new serpentine belt and also the tensioner at Advance Auto parts. I took the old belt in to make sure I got the correct one and I got the tensioner number from a Cat technician friend. That problem solved. Almost a year later, now, my alternator is only putting out 12.4 volts without any load. Also failed the alternator amperage output test, showing weak diodes. As soon as I get the replacement, and if it fixes my issue, I will post all part numbers in case someone else finds this issue for their rig. Thanks again for the help guys!

Thanks Rayin, I will do that.

On this same Motorhome, anyone know what the serpentine belt number might be?

I have found a steering box for my RV at Wheller Truck Parts. It will take 5 days to come in but it is a new unit, not a reman. $1100 with my core, but problem solved. A reman was $900 and would take 10 days to make it and then another 10 to get it to the store. I elected to order the new one and drive 2 hours to the store, take my core in( worth $500) at the same time, so with tax about $1300 total. Hope this post will help someone else too. Thanks again for all of the help here!

Thank you, rayon, for the information. I will start with them. I also understand they make a TRW change over kit for this. I found the rest of the number today on the steering box. It is a Sheppard M80PAW1 automatic adjusting. Any help on the TRW would be helpful too. Thanks in advance.

I have a 1996 Beaver Monterey 36 foot, Cat 3126, Allison Automatic DP. My sector shaft seal started pouring fluid out when I backed into my driveway to park the RV. I have been researching everything and everywhere for information on this M80 steering box from Shepherd. So far I have found that these M80’s are not as available as the M100. My Beaver has an SMC Magnum S series chassis, (S26A330, S24E250, S24E300), and I have found one place I can order a seal repair kit (#5543461). My problem is two things. I cannot locate any place that sells the Shepherd M80, and I can’t find the series number on the steering box as of yet, for the other numbers for the M80. I have taken photos of the box still on my unit which I will try to post here. Any help would be greatly appreciated. The Dream Machine 1996 Cat 330DP