M35a2 hydropac question

[Darwin T]

i am having issues and i did search but did not get a yes on no answer. i am about to order a new hydropac/airpac and i want to get the right one. i want to use an air side brake light switch instead of a fluid side switch, after mine started leaking and smoking. all that being said, here is my question. is either hydropac ending in 255 or 003 already set up for air side switch or will i need to redo my new pac?

i think the 255 one is right but when i think i am usually wrong.

 

[doghead]

Why not ask the seller of the item?

 

[cattlerepairman]

I am not sure I understand the issue. I do understand the question. All the pack needs is a pipe plug instead of the hydraulic switch. If the plug is not already there (caution: do not mix up a spray painted plastic plug with an actual pipe plug!) you can add one in under three minutes before you put the air pack onto the truck. You need to bleed the pack anyway, so no issue "opening the hydraulic side" by removing a cap and adding a plug before the pack goes on. The air side brake switch sits in the line that provides air to the trailer glad hand when the brake pedal is depressed, not on the air pack itself. You will have to modify the electrical connectors that are on your truck.

 

[Darwin T]

i have several i am watching and i am guessing most sellers just know what the lable says. if these is one type that is aready set up i thought this is the place to find out. that way i could buy the right one from the start.

 

[Darwin T]

thanks cattlerepairman i will be replacing my wheel cylinders and brake hoses at the same time so it will be a full system bleed.

 

[doghead]

If you doubt they know there product, why would you think they know the correct NSN?

Is your shift key broke too?

 

[DeucesWild11]

Darwin T, here is a schematic if that helps you out visually. The Brake light switch is part *a all you should need is the plug #7 and the T section #17 if you want to upgrade a standard Airpack. I just did it for mine but I didn't need the T section as I don't have an airline running to the back for trailer brakes.
Good luck!

 

[Darwin T]

"i am guessing most sellers just know what the lable says" thats where the NSN is located or it is stamped on the part. and NO my shift key work fine. i don't know anyone personally that has converted from the fluid side to the air side switch. thanks to cattlerepairman i now know neither hydropac is set up for an air side switch because the air side switch does not go on the hydropac.

cattlerepairman the issue is i could not find the answer after several hours of searching.

 

[Darwin T]

Deuceswild11 thanks that explains what the parts shown in an upgrade kit are for. so either hydro pac has the same connections so there is not a wrong one, because if there was that would be the one i bought.

 

[DeucesWild11]

No Problem, glad I could help..Someone shared that diagram with me when I was upgrading the switch after I broke it the original one, it was a big help.. Always enjoyed your threads on LED lighting upgrades!

 

[Darwin T]

thanks. this is the same truck i am working on now. the plan is new hydropac, master cylinders, wheel cylinders, brake hoses, bearings, gaskets and seals on all 3 axles. i also am adding front wheel locks.

 

[cranetruck]

Why not rebuild the one you have?

 

[Darwin T]

I am going to rebuild it and either put it on one of my M35a2s or keep it as a spare. One of my a2s is starting to have brake issues. As I work on my M109a3 I am putting new parts on it and either rebuilding or just moving the ones I take off to my other trucks. The work I am gatering parts for how all steems from dry rotting brake lines. Instead of just replacing the lines while I have it appart I am going to do a brake/axle rebuild. I want to be able to just get in any one of my trucks and go with out worry of old parts giving out on the road since I have almost no mechanical skills.

I keep spares for most major parts (air compreesor, fuel tank, intank fuel pump, injectors, water pump, full set of spare tires, hoses, belts, battery terminals, altenator, old style head light incase my LEDs fry, 3 switch light switch incase my LED switch fries, side windows for my M109a3 box, door windows for both sides, windshields, and on, and on, and on) i used my spare radiator. i don't have a starter or hydropac yet.

 

[DeucesWild11]

Darwin, incase you want to tackle the Airpack rebuild you may have already seen my thread on my rebuild http://www.steelsoldiers.com/deuce/82753-my-airpack-rebuild-photos.html

I listed all the tools you'll need too. I am somewhat mechanically inclined but am not a mechanic. If you take your time and are patient it's not a bad rebuild..

 

[Darwin T]

Thanks I will when I rebuild the one I take off. I have a great mechanic but now that my daughter has moved off for college I am going to start learning to work on my FMVs myself. I can do anything I set my mind to I just need someone to show me first of someone to make sure I don't screw it up.