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Author Topic: Jake Buffer Switch  (Read 4798 times)
tomhamrick
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« Reply #15 on: October 07, 2010, 09:45:09 AM »

Hey Paso, It is a Jacobs part. Friend of mine who has worked on 2 strokes all his life ordered it for me and advised me to install it.

Hey Clifford, The only disadvantage I can see to it is the possiblility to press the peddle while having the throttle depressed and that could, I understand, damage the valves.  Anything else I need to know about? The peddle is in front of the high/ lo / off switch on the dash and provides 12 volts to that switch.

Thanks,
Tom hamrick
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Tom Hamrick
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« Reply #16 on: October 07, 2010, 12:23:54 PM »



Tom

 I have the switch on my dash. It supplies the 12 volts to the buffer switch. if it is off no jackes   if on jackes work through the buffer switch.

wish I was at the rally hope all is doing good.

uncle ned
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« Reply #17 on: October 07, 2010, 02:22:11 PM »

The whole point of the buffer switch is to turn the Jakes off when you use the accelerator.  This is important.  You could do it manually, but it is probably asking for trouble.  Anyway, it does not matter whether your Jake on/off switch is on the dash or floor.  Whatever your preference there does not erase the need for the buffer switch.  Since the buffer switch uses the same port as used by the high idle, you can choose to get the simple buffer switch and do without high idle.  If you really think you need high idle, then you use a buffer switch the incorporates both functions.  That is the one that is so expensive.  In any case, there are lots of places to try to save some money, but I do not think that doing without a buffer switch is a good one.
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« Reply #18 on: October 07, 2010, 02:53:11 PM »

I'm I correct in surmising that the high idle buffer switch detects high idle and turns the jakes off (as well s functioning as a regular buffer)..  In that case could one not simply turn off the jakes when idling/high idling?  Does one not need to have operational OTR OEM AC for the high idle to be useful?
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Rick 74 MC-8
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« Reply #19 on: October 07, 2010, 04:05:46 PM »

Huh
« Last Edit: October 07, 2010, 04:17:07 PM by Rick 74 MC-8 » Logged

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Rick 74 MC-8
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« Reply #20 on: October 07, 2010, 04:15:56 PM »

Zub

     The combo switch just lets the fast idle air cyl push on the buffer rod that comes out of the governor pass Thu the switch the switch only closes went the rack is a no fuel and really has nothing to do with the fast idle except using the buffer rod fast idle pushes it in switch closes when full out (no fuel)



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« Reply #21 on: October 07, 2010, 05:55:47 PM »

  Anyway, it does not matter whether your Jake on/off switch is on the dash or floor.  Whatever your preference there does not erase the need for the buffer switch.  Since the buffer switch uses the same port as used by the high idle, you can choose to get the simple buffer switch and do without high idle. 

I wasn't looking to elimanate the buffer switch or it's cost. I was thinking I wouldn't have to put down my Diet coke to get a free hand to switch the toggle Smiley I have two feet that hardly do anything with the automatic Smiley
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tomhamrick
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« Reply #22 on: October 08, 2010, 08:09:56 AM »

Hey fellas,
I did not replace the dash high/lo switch with the foot pedal, just added it in front of the switch to supply 12 volts to the switch. The foot pedal replaces the buffer switch so that I can coast without the jake coming on or turning the dash switch off and on.  I actually use it as an additional brake pedal. This way may not be for everyone but it works for me.
If there are warnings that I need to be aware of please let me know. I am always open to learn.
Tom Hamrick
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Tom Hamrick
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« Reply #23 on: October 08, 2010, 08:15:20 AM »

What I do is either toggle the dash switch on and off manually, or just barely crack the throttle pedal and the buffer switch turns the jakes off.  If you have a buffer switch to make sure that you never have the jakes on when the throttle is open, then I don't see the difference between using a foot switch, using the  dash switch or cracking the throttle to open the buffer switch.  The electrons get interrupted the same either way.  My setup also has the clutch switch, I can get the same effect by riding the clutch pedal a bit, taking up free play. but I don't do that.

Brian
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« Reply #24 on: October 08, 2010, 08:27:20 AM »

Tom, the governor and buffer controls the Jake's on the 2 strokes they disengage at 900 rpm and that is done to protect the engine just be careful you are a smart guy may not ever be a problem for you, just not my way of installing one  


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« Last Edit: October 08, 2010, 08:37:37 AM by luvrbus » Logged

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tomhamrick
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« Reply #25 on: October 08, 2010, 09:41:56 AM »

Thanks Clifford,  I appreciate the info.  I have the buffer switch and could install it and still use my pedal the same way I do now to provide power to the dash switch. This would offer me the protection of not accidently hitting the pedal during throttle application but still have the control I like of not having it apply on every release of the throttle.
Tom Hamrick
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Tom Hamrick
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« Reply #26 on: October 08, 2010, 09:46:26 AM »

I still don't see why a any old old switch couldn't be used instead `actually in both applications (regular and high idle).  Cruise controls usually have 2 of these for clutch and brake to disengage.  I mention this because this post started with concern for the high cost of the switch.  Plus I know !%&* about jakes and making ignorant suggestions sometimes gets me the info I need.  Oh and I will get jakes one day, and when I do maybe I'll have a clue.
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« Reply #27 on: October 08, 2010, 10:13:40 AM »

I think there are too many switches being talked about!  The buffer switch is required for jake brake control that automatically turns off if the speed lever isn't all the way closed.  Two different kinds of buffer switch - expensive kind that only controls the jake switch, and really expensive kind that also incorporates the high idle air cylinder.  The high idle function is incorporated in the buffer switch, but it's pretty much separate from the jake brake switching function.

The other switches are the control switches on the dash, on the clutch pedal and maybe a foot switch.  These work in combination with the buffer switch so that you have different  ways of controlling the jake operation to suit your taste.  The clutch switch ensures that the engine keeps running if the jake switch is on, throttle pedal is up and the clutch is in, like when you are sitting at a stop light.  You can wire the dash switch so you have high and low jake action, which is either one bank (of a V-engine) is active, or both banks, or the equivalent in a 4 or 6 cylinder engine. 

What I suspect is not usual is having jake brakes and not having a buffer switch at all.  That would let you have the jake on while you were asking for power, with the injectors injecting and all of that, and I have no idea what would happen, probably little that was good.

Brian
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Iceni John
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« Reply #28 on: October 08, 2010, 11:29:47 AM »

And for us folk blessed / cursed with DDEC, is the buffer switch replaced by a function within the DDEC?   Why I'm asking is that my high idle doesn't work, and I'm wondering what it would take (apart from $$$$) to get everything working right.

Many thanks, John
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« Reply #29 on: October 08, 2010, 03:16:46 PM »

[What I suspect is not usual is having jake brakes and not having a buffer switch at all.  That would let you have the jake on while you were asking for power, with the injectors injecting and all of that, and I have no idea what would happen, probably little that was good.
Brian]

I can tell you what happened when my buffer switch failed, if you're interested. Aw heck, I'll tell you anyway since I don't have anything else happening right now. Grin After coming down a long grade with the Jake on, I stepped on the throttle to maintain speed and the coach kept slowing. It felt as though the engine had died. I went from 60MPH down to 35MPH before I realized that the engine was still running but with no power. I flipped off the dash Jake switch and noticed a huge cloud of blue smoke in the rear mirror followed immediately by a surge of power and a huge amount of relief on my part. This is the only time I have had the throttle depressed with the Jake switched on. I think I got lucky because she still runs like a champ after that incident, but now I have to manually switch on the Jakes when I need them and then flip them off before I need power. It's not a big deal to me, since I grew up driving a dump truck that worked the same way. FWIW-my high idle still works, Will Grin
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