jaysm35a2 Posted December 4, 2011 Share Posted December 4, 2011 I cranked the truck today to take it out for a fuel run. Its well below freezing but she cranked ok and ran great, But , I shut it down I heard a air leak. I see that the air is coming from both my air hoses that go between the truck and trailer at the glad hand and a little screw on the bottom of the part the hoses screw into.Heres a pic, would changing it out fix it? Im guessing the ?o rings? inside might have gone bad? Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/ Share on other sites More sharing options...
Rob Posted December 4, 2011 Share Posted December 4, 2011 I cranked the truck today to take it out for a fuel run. Its well below freezing but she cranked ok and ran great, But , I shut it down I heard a air leak. I see that the air is coming from both my air hoses that go between the truck and trailer at the glad hand and a little screw on the bottom of the part the hoses screw into.Heres a pic, would changing it out fix it? Im guessing the ?o rings? inside might have gone bad?That is a TP-1 style tractor protection valve. They are hard to get and obsolte over 20 years ago. I'd go with a TP-3 which is commonplace nowadays.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-92974 Share on other sites More sharing options...
leversole Posted December 5, 2011 Share Posted December 5, 2011 That is a TP-1 style tractor protection valve. They are hard to get and obsolte over 20 years ago. I'd go with a TP-3 which is commonplace nowadays.RobAlso when you change to the TP-3, you should change the "flipper" style control valve to a new PP-3 or 7 to maintain the automatic safety logic... Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-92980 Share on other sites More sharing options...
jaysm35a2 Posted December 5, 2011 Author Share Posted December 5, 2011 Nuts , I didnt want to change it all over but if I have to , I have to. Would that failing be the reason why im getting constant air from my air lines to the trailer. Its only a tiny bit of air but its constant. Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-92989 Share on other sites More sharing options...
Rob Posted December 5, 2011 Share Posted December 5, 2011 Nuts , I didnt want to change it all over but if I have to , I have to. Would that failing be the reason why im getting constant air from my air lines to the trailer. Its only a tiny bit of air but its constant.Exactly. there is a shuttle valve inside the TP valve that is air operated. It is stuck partially open from age/corrosion/leakage. The small air line run to this valve is the pilot air line from the flipper switch in the cab for "normal, or emergency" selection. The port inside the TP valve should be blocked from passing air in the emergency position.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-92997 Share on other sites More sharing options...
jaysm35a2 Posted December 5, 2011 Author Share Posted December 5, 2011 10-4, I looked up the TP-3's and it looks like I can pretty much unbolt the TP-1 and bolt in the TP-3 and connect everything back up with no issues. I dont have a Fleetpride close by so il have to call the IH dealer and KW dealer to see what they have around. Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-92998 Share on other sites More sharing options...
Rob Posted December 5, 2011 Share Posted December 5, 2011 10-4, I looked up the TP-3's and it looks like I can pretty much unbolt the TP-1 and bolt in the TP-3 and connect everything back up with no issues. I dont have a Fleetpride close by so il have to call the IH dealer and KW dealer to see what they have around.Yes, it is basically a "slip fit". They just look a little different.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-92999 Share on other sites More sharing options...
Freightrain Posted December 5, 2011 Share Posted December 5, 2011 Mine started doing the same thing this fall. There is a set screw with a hole in it that is seeping ever so little. If i flip off emergency its fine, but then i have to plug the air lines.By chance a buddy from ATHS forum has one and is going to get it to me.Ive had mine apart, it looks fine, all lubed up still. First time I activate it then it starts to leak. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93052 Share on other sites More sharing options...
jaysm35a2 Posted December 6, 2011 Author Share Posted December 6, 2011 Yeah mines leaking from the screw too Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93088 Share on other sites More sharing options...
Mike Posted December 6, 2011 Share Posted December 6, 2011 Yeah mines leaking from the screw tooJayHave you tried www.anythingtrucks.commike Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93089 Share on other sites More sharing options...
jaysm35a2 Posted December 6, 2011 Author Share Posted December 6, 2011 Mike the link didnt work. Im picking up the TP3 today for it. Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93091 Share on other sites More sharing options...
jaysm35a2 Posted December 6, 2011 Author Share Posted December 6, 2011 Heres what came today , whats the big end that looks open with the rubber ring? Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93101 Share on other sites More sharing options...
leversole Posted December 6, 2011 Share Posted December 6, 2011 That is where the air comes out when you release the brakes... Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93102 Share on other sites More sharing options...
jaysm35a2 Posted December 6, 2011 Author Share Posted December 6, 2011 Thank you sir, I thought it was but my TP1 doesnt have that.Looks like it would wear out faster than the older valve. Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93104 Share on other sites More sharing options...
leversole Posted December 6, 2011 Share Posted December 6, 2011 Did your old one have three air lines to it, or only two? Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93105 Share on other sites More sharing options...
jaysm35a2 Posted December 7, 2011 Author Share Posted December 7, 2011 3! Thats what I was going to ask now.. do I cap that extra line? Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93194 Share on other sites More sharing options...
Rob Posted December 7, 2011 Share Posted December 7, 2011 3! Thats what I was going to ask now.. do I cap that extra line?You don't. One line is the service, (blue). The other is the emergency, (Red). The last line is the actuator which connects to your dash valve to operate the valve.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93195 Share on other sites More sharing options...
jaysm35a2 Posted December 7, 2011 Author Share Posted December 7, 2011 Where would I screw the 3rd line into if the new TP-3 valve doesnt have one? Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93196 Share on other sites More sharing options...
Bollweevil Posted December 7, 2011 Share Posted December 7, 2011 Look at a TP 2 valve. Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93198 Share on other sites More sharing options...
jaysm35a2 Posted December 7, 2011 Author Share Posted December 7, 2011 Yeah , im seeing a TP2 that looks ok online and a TP3/DC on ebay that looks ok , but the regular TP-3 doesnt seem to look like its going to work. Il have to order another one when I can now. Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93200 Share on other sites More sharing options...
leversole Posted December 8, 2011 Share Posted December 8, 2011 The TP-3 valve uses only two lines...the push button on the dash not only charges the trailer, it opens the valve so that the service chambers on the trailer work when you step on the brakes...I dont think you are supposed to use a flip style switch with the TP-3 Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93235 Share on other sites More sharing options...
leversole Posted December 8, 2011 Share Posted December 8, 2011 Maybe this will help... Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93239 Share on other sites More sharing options...
leversole Posted December 8, 2011 Share Posted December 8, 2011 Here is the TP2 style valve...You can also use the trolley valve and double check valve as in the TP3 diagram Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93240 Share on other sites More sharing options...
jaysm35a2 Posted December 8, 2011 Author Share Posted December 8, 2011 I still have an extra line that I need to take out and put on the push button or just put on the TP-2. The tractor park is the push button while my trailer is the flipper. Thanks for putting up the pictures , its nice to see how it all works. Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93259 Share on other sites More sharing options...
jaysm35a2 Posted December 9, 2011 Author Share Posted December 9, 2011 I got the part in today , Bindix and Midland still sells the Reman TP-2 valves. Not a bad price either. Going to try tomorrow to install it. Quote Link to comment https://www.bigmacktrucks.com/topic/21944-air-leak-question-for-you-guys/#findComment-93419 Share on other sites More sharing options...
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