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I called another dealer and they allegedly can still get them. I placed and order and we will see. My next option would be to have one scanned and reproduced.

Does anyone have a source for the 6 speed shift pattern decal? My local dealer cant get them and ProGear shows them but after I placed an order it was cancelled stating no stock. I'm hoping to locate one somewhere. I might try to call a couple dealers and maybe there is a NOS one sitting on a shelf somewhere.

Well I finally rectified the issue. When the previous owner replaced the rotted out top of the relay he probably didn’t realize the new one had a check valve in the top plug. I didn’t catch that difference either. I went ahead and ordered another relay of the same model the previous owner had purchased which was actually the incorrect model. There was a divider in the bottom housing between two ports that isn’t suppose to be there for this application. Long story short I milled that divider out and removed the check valve in the top brass cap and everything functions as normal.

I figured there would be some members here that also have interest in old cats too.

Quick update - Took the truck to the local dealer and they looked it over. The tech found that my relay was mislabeled on the box and I didn't pay attention to the actual tag so he thinks it might be the incorrect relay. He found it has an extra port under the brass fitting on top. I'm going to swap my old top onto the new base or simply purchase another one and confirm its the correct one this time! The problem appears to be with the service brake and not the emergency brake like I was originally thinking. It only affects the front drive axle though when everything is hooked up.

Thanks guys, Ill do that later this week and keep ya updated. Appreciate the help as always!

Yes the driver side looks pretty new but the passenger side one looks like it could be original.

I didn't get that far. The service brakes appear to work great though with that rubber hose unhooked and relay capped. It appears to just be an issue with the parking brake? Could I possibly have a bad air chamber on the front drive axle? This is the only place that uses the parking brake style air chambers.

Well I installed the new relay and still have the same problem. Possible bad quick release was mentioned. I will have to dig further into this.

Understood!

Here are a couple pics from this spring of my Caterpillar D2's. The one on the right was the most recent purchase, Made the trip from NE to MN. I think I may have a hoarding problem! HaHa

Just want to confirm these parts: Seal: 370025A Shoes: 4515Q 16.5x7 Drums: Anyone able to tell what size the drum is or do I have to remove them and get a measurement? I will check with my parts stores but sometimes like to order online as to get a better quality part the my local jobber stacks. I cant speak for commercial vehicles but seems like everything at my local automobile parts store is china made and I try hard not to support that. Thanks everyone for the help.

Nice looking truck. Keep us updated on your progress!

I hear ya!

Just looking under the relay and it looks pretty cruddy.

I can give that a try too. The brake relay will be here tomorrow so I will probably put that on. The brakes act like normal with that hose removed and port capped. Makes me think it’s the relay.

Yes the brakes lock on with 1 application of the foot brake. The cap that was put on the relay is the wrong threads but it kinda seals. After the brakes lock on I can hear constant air blowing out of that port. I purchased the truck in this condition. The original owner died and his wife consigned the truck through the local CAT dealer. The brakes were locked and the mechanic removed that hose and capped the relay so it could get loaded on the lowboy.

Very good! That's a great referance.

Sounds good!

Can I just unscrew the nut holding the air line and pull it out? Can they then be reinserted and reused as is?

That's good advice! Pretty much confirmed my plan to start with new. I have a number of weeks until harvest so shouldn't be an issue to get it done.

Correct yes the front drive axle. I would have to follow the other lines but I know one or two go back to another relay for the brakes on the rear drive axle. After first applying the service brakes there is air coming out of this plugged port regardless if the pedal is pressed or not. I assume it should only be pressurized when the pedal is pressed as to activate the brake cans.

I have what I believe to be a faulty front relay valve. When I first air the truck up and release the parking brake I can move the truck as normal until I first press the service brake then the brakes are locked on. We removed and capped the air line that goes from the relay and feeds the front axle and then the brakes act as normal. Does this sound like a bad relay valve? I found the same one on ebay and it should be here today. Haldex 28071. When I remove the nylon air lines can I reuse them as is or do they need to be cut shorter with a new ferrule added? They are already as short as can be so that would involve making a junction on all lines or replacing the whole length which I hope I don't have to do.