LMTV air/brake problems

[Oxyacetylene]

If the top diaphragm in the tractor protection valve is bad, it will leak air out of the vent cap on the side of the valve when you are pressing the brake pedal. I'm not sure what other leaks you would have if other parts of the valve are bad. There is a rebuild kit for the valve available at Napa. http://www.steelsoldiers.com/showthread.php?140345-Air-Brake-Info-and-Troubleshooting

 

[Lmtv772]

I saw it do that at any time, not just when the brake pedal is pressed.

 

[Oxyacetylene]

I saw it do that at any time, not just when the brake pedal is pressed.

Oh OK gotcha. On mine it was when the brake pedal was pressed. Good to know!

 

[Suprman]

There is troubleshooting flow charts in the TM but the tractor valve is a likely culprit. There are several diaphragms in it, the rebuild kit has them all I believe. I speak with alot of lmtv owners. All of the trucks that sat unused for a period of time, especially in a hot climate seem to have bad diaphragms all around.

 

[Lmtv772]

Suprman, said it as it is

 

[FloridaAKM]

NAPA has listings for all of the Haldex valves & repair kits, but no available stock anywhere according to my local NAPA store! What is plan "B" for those of us with an airbrake issue with these valves?

 

[RAJ LMTV]

NAPA has listings for all of the Haldex valves & repair kits, but no available stock anywhere according to my local NAPA store! What is plan "B" for those of us with an airbrake issue with these valves?

I just replaced the 3 valves above the drivers wheel and ordered the repair kit for the tractor valve yesterday. All thru NAPA. No problem ordering the parts......

 

[Suprman]

Fleetpride usually has the parts at one days time availability. I'm spoiled I keep parts trucks around so when most things brake I have the parts to swap out.

 

[coachgeo]

NAPA has listings for all of the Haldex valves & repair kits, but no available stock anywhere according to my local NAPA store! What is plan "B" for those of us with an airbrake issue with these valves?

Don't let that fool you. This does not mean they can't get them. Often when the say that...... it is a fact buttt.... they can order them from them manufacture's own warehoused stock.

 

[FloridaAKM]

It also depends on which sales guy you are talking to, some are very helpful & some are........you want parts for that ole army truck, ain't available any where or any more...sorry! They flat said that there is no stock anywhere including the manufacturer.

 

[RAJ LMTV]

It also depends on which sales guy you are talking to, some are very helpful & some are........you want parts for that ole army truck, ain't available any where or any more...sorry! They flat said that there is no stock anywhere including the manufacturer.

Definitely depends on who you get. I've been to the same NAPA for parts, most of the guys are worthless. Happened to get one guy who was interested in military vehicles, knew all about NSN and how to cross reference parts. He's the one that got me the various valves and rebuild kit. You might try a different NAPA if possible.

 

[Lmtv772]

I found all the parts I needed at 'find it parts . Com' (no joke)
i bought shuttle valves instead of diaphragm
part # kn25061 for the shuttle valve
part # RN31BC for the tractor protection valve repair kit
both are haldex parts

 

[Oxyacetylene]

If Napa isn't very helpful at your local store, look for a heavy duty truck parts place. Near me there is Napa (distribution center), Fleetpride, Truck Pro, and one or two others. All of them can look up the same Haldex part numbers to find what you need.

 

[Lmtv772]

Or you avoid all the hassle and order it online.

 

[FloridaAKM]

What is the difference between the Haldex KN25061 & the KN25060 shuttle valves.......you quoted both in this thread. Which one is correct?

 

[Oxyacetylene]

What is the difference between the Haldex KN25061 & the KN25060 shuttle valves.......you quoted both in this thread. Which one is correct?

They both serve the same function. The 25060 is what the trucks came with and is a diaphragm type valve. The 25061 is a shuttle type valve.

 

[Oxyacetylene]

What is the difference between the Haldex KN25061 & the KN25060 shuttle valves.......you quoted both in this thread. Which one is correct?

Also worth mentioning, the thread I linked earlier has the part number for the rebuild kit for the 25060 if you wanted to go that route. Not a huge price difference to just buy a whole valve, and you could rebuild your old ones as spares. Just an option.

 

[FloridaAKM]

Thanks for the help, order is placed for replacement valves & repair kits. Thanks for the help & explanations of the parts & where to order them from! You just stomped my local NAPA as far as being helpful on this brake repair job. I had to order an exhaust pipe clamp from them that goes under the cab, that took them 10 days, cost me $40.00 & it didn't fit anything! Returned with a smile!

Again, thank you for the help!

 

[Lmtv772]

Well the difference is that shuttle valves have a pice inside that slides and seals. Deuces have the same valve. It is the sturdier version. Membrane valves have a rubber seal inside that can be rebuilt. I like shuttle valves a lot better. Since they are not much more Price wise

 

[FloridaAKM]

I have all the parts I ordered last week delivered this morning. Now I can tackle the air leaking problems head on with repair parts in hand. Thanks for the online source!