leversole

Wonder if the hibs would fit my 1988 38K rears? Anyone know for sure?

I could use the front shocks...but shipping might be ridiculous!

It is so tough it will sharpen pens too!

Thanks to wise guidance I received from youse (central pa for "you all"), I ordered the rebuild kit for my AD-4...

After removal I gave it a bath (I HATE ENVIRONMENTALLY FRIENDLY CLEANERS!!! GIVE ME SOME PETROLEUM BASED SOLVENT!) Anyway, I digress...

Once I got it apart it was not hard to figure out the issue...the check valve had its check missing! It was an orifice!

The bracket was cracked at both mounts so I fixed that up...also used large doublers to prevent reoccurance!

Everything back together and it works like a champ! My compressor actually shuts off until cut in pressure! The dryer was like this when I got the truck...it is a wonder I didnt wear the compressor out!

Lesson here...if your compressor cycles constantly, and you replace the governer to no avail, it is most likely the check valve in the dryer draining the wet tank!!!

yup, with that air cleaner with a roadranger trans im thinkin it might be an R612 with a 300+ or someone put a roadranger in it behind a 285. either way it has an air cooler and looks like he grille is bolted to it?

He told me the tranny was a Mack 9 speed...

Glad you got to spend some time with him at the end...

that wasn't my thong it was Reds! don't tell Ken he'll be hart broken. I was using them to feed apples to the horses .....(kinda like a sling shot)

well any how the one side came loose and spanked o'l Red who was bent over getting another apple outta the bucket , anyhow she thought I did it on purpose! so she grabbed them outta my hand and gave them a toss, that's when they got hung up in the trusses, then ken came out and removed his kilt and tried to knock them down with his kilt .....and well you can figure out the ending!

Glad to hear you gave them the ol'e what for and then was able to walk away.

Did Ken have any drawers on? Most men dont let anything come between them and thier kilts! I dont want to picture Ken naked in your barn...

Passed my Class A CDL written test today and am the proud holder of a Class A CDL learners permit!

Now I just need to figure out how to get some time pulling/backing a trailer!!!

The AD9 will work in same bracket and connect same way as the AD4, however you will need to use a two wire connecter to the heater elemet were the AD4 use one wire.

Thanks for all the input...I'll get the best price for an AD-9, weigh it against rebuilding the AD-4...

Curious, I assume the second wire is ground? I can just run a short jumper to the frame?

Already have a nice air hookup to the wet tank...it is how I get it out of the shop quicker! Air it up and go!

Just got back from a nice long ride, I left the control line off of teh dryer and the air system performed like it should...I have never seen the air below 130 before now! It goes down to cut-in pressure and fill's her back up!

WIll either get a rebuild kit or replace with a reman AD-9...anyone got any experience with the swap? Or insight on how the AD-9 is different than the -4?

Leslie : with the truck shut off remove the wet tank drain and install a air chuck and hook to shop air, then go leak searching

Already have a nice air hookup to the wet tank...it is how I get it out of the shop quicker! Air it up and go!

Wow! THat is cool! Wonder how much he is asking?!? I wonder if Mike is on his way to get it!!!

Had to re-read a few times to get it (maybe I got it!)...anyhow, I downloaded the manual for the AD4...the test for the check valve involves removing and capping the control line to the govenor and monitoring the wet tank pressure...was not real clear on what I was supposed to be observing with an external guage, BUT...without the control line hooked up, the compressor builds to 140 and stops, the if I fan off about 10 lbs, nothing happens just like it supposed to, fan off a little more and the compressor kicks in and builds up like it should. SO...the problem is definitely the dryer, will read more and try to figure it out...Thanks for all the comments...I am half way there!

Had another thought (my brain is getting me closer, albeit very slowly!)...the reason it seems to me like the compressor is not unloading is that I never see a drop on either gauge, WELL, if all my check valves are working, I would never see a drop in the WET TANK! VIOLA! I think I understand! I still dont know where the air is going to drain the wet tank, but I believe I have found the issue!

Another thing that make the drier there purge too often is if the check valve in the drier is leaking draining the wet tank.On the mack like all trucks the air governor gets its air supply from the wet tank.So if the check valve on the drier is leaking back thru the open purge valve in the dreir the pressure drops on the wet tank and then the governor will engage the comp to charge up the wet tank again so it can lose pressure too soon and same old thing over and over. The 88 mack came out with a AD4 which had a plactic flpper check valve inside but the two wire AD9 which will go in the same brackets will have a out side screw in valve on the bottom which can be changed with out a tear down.

Had to re-read a few times to get it (maybe I got it!)...anyhow, I downloaded the manual for the AD4...the test for the check valve involves removing and capping the control line to the govenor and monitoring the wet tank pressure...was not real clear on what I was supposed to be observing with an external guage, BUT...without the control line hooked up, the compressor builds to 140 and stops, the if I fan off about 10 lbs, nothing happens just like it supposed to, fan off a little more and the compressor kicks in and builds up like it should. SO...the problem is definitely the dryer, will read more and try to figure it out...Thanks for all the comments...I am half way there!

Tru-Flo 501...will call the dealer tomorrow! SOunds like a weekend project...my weekend started today...no more Fridays (and not many Thursday for that matter!) for me the rest of the year!

I was thinking that myself, that the unloader was leaking/sticking...what type of compressor is yours and what was the part number for the kit?

I didn't have any trouble getting in or out...

Thats right!