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P.S. glad it worked for you. disconnecting the line and running at high speed is kind of a "hail Mary" type situation, may work, but sort of last ditch effort before pulling the compressor.

I don't think the TF501 has that. Replace the elbow from the tube with a T fitting and a pipe to flare adapter and put the relief valve there. Also inspect or replace the copper line. If the head had carbon build up good chance the copper line does also. Be sure to use a high temp relief valve as the outlet temp can be quite hot

97 is when V-Mac changed from 2 to 3, coming out in '98. A whole other animal.. i just packed up a bunch of my books during a home repair project. I may try to look for my drawings. I have a bunch.

I wish i was familiar with that compressor, i cant tell from the pictures. On Bendix Tu-Flo and I think Midlands pumps too, there is a plug in the head on the air side not the coolant gallery. They can accept the releif valve.

Thank you. The transmission is an Eaton 9 speed. I found a E-7 overhaul manual on Ebay so that is a possibility. I think maybe an owners manual that would layout what instruments were in the dash and just general information would be a help. The wiring behind the dash Is terrible. I really need a wiring diagram to try to work that out but in the end I may have to rewire to get the basic things working and be happy. I see books for 1997 RD and later but not the 1992 to 1997.

Just seen that pic now.I dont see a port to fit one on the head... Paul

Yeah a fair bit of black carbon debris came out on the shop rag.No theres no pressure relieh valve on the head,would I fit one to the outlet and adjust the pipes to suit?... Paul

I know what you mean Bob.I woukd say Im the same.I did serve my time as a mechanic but that was 40 years ago.I have restored a number of cars and pick ups over the years but this is my first big truck.Sometimes I need reminding of things I once knew but have forgotten.The guys on this site is just great for that.... Paul

Id say a lot of black carbon like debris was restricting flow out of the compressor. Is there a pressure relief valve on the copressor head ? If not, i suggest adding one. We use 150 PSI releif valves.

Awesome !!

Geoff,Joey I cant thank you guys enough for your tech support.The compressor is now working fine.I sprayed brake cleaner in the exhaust side and blew it out with shop air.I then ran the engine at high rpm and tapped the head gently.It blew out some debris onto a shop rag.After reassembly it worked just fine.Many thank again guys..... Paul

Yup I always followed the parts guys to the parts that way I new I was getting the right part! Nothing pissed me off more than getting the wrong part ! Our boss bless his heart believed any monkey could hand out parts! NOT SO! A good parts Guy is Gold if you can find them ! Just like any trade!

So true fjh. When Mack went WID numbers, the whole parts room was turned upside down. Our shop allowed some of us mechanicsnin the parts room with a parts guy, and many parts were grouped together as they related to each other. For example 'AX' was bolts. I have forgotten a lot, so i dont have many examples. Sorry Freightrain, I felt compelled to divert a bit. Did you download the KSA&A Book ? It is very helpful..

They can't work with out a computer! and vin and even then ................. It doesn't help that the Volvo parts system takes a PHD to run it! the Mack parts system Made most parts guys look like wizards ! The letters in the part number gave you a guide to the parts location! Now is just a number! The system sucks! A parts guy now needs to have a good back ground in puters and numbers! Just ask the Heinz hes had a good mix of hands on!

Fleets usually get rid of them around 500000 because that's around the time warranty runs out and it's hard to get or keep driver's in older high mileage trucks.

I find it seems the guys that really knew the parts they were selling are long gone and most of the parts pushers don't have a clue and don't care that are at the counters now but one number wrong can be a big problem I remember a guy at Cleveland Bros that ordered a part for a tractor in the dirt shop and got in a track frame for a d-9

Shhh. Maybe everyone won’t figure those tricks out. Lol.

I can tell you one thing about the M drive transmission. Mack doesn't sell or manufacture a rebuild kit for it (Was told by our local Mack Dealer) don't know if they do now. But Dealer said they are built to be Bullet proof and if something happens that it fails The owner was doing something wrong with the truck. That's how good they are.

Tampon Tim and Omar, volume up! lol .....Hippy

You're welcome. It can be rough housed just have to push the right dash buttons like taking the hill assist and traction control out of the equation. Also should have a mud snow button which would help as well. Also the plus minus buttons come in handy for controlling performance of the M drive as well. No upgrades required