Proper clutch use

Discussion in 'Experienced Truckers' Advice' started by Lucy in the Sky, Oct 19, 2016.

  1. Lucy in the Sky

    Lucy in the Sky Medium Load Member

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    What is the best way to use your clutch to make it last the longest? This includes the clutch brake. I used to keep the clutch fully depressed when stopped until i read a couple posts by @MACK E-6 talking about this wearing the clutch brake out so now i keep it off the floor a few inches.

    Does double clutching help? When learning to drive others told me manufacturers recommend double clutching so the clutch wears faster and needs replaced. Is this true? I never actually learned how to double clutch everyone told me to float

    Obviously riding the clutch is terrible for it everyone knows that but sometimes it's hard not to when backing or going through a wash bay...
     
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  3. not4hire

    not4hire Road Train Member

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    Only use the clutch brake when at a full stop. Only use it when you need to engage the gears. Do not engage it while stopped and do not engage the clutch brake while coming to a stop (the number one reason clutch brakes get toasted).

    Double clutching is necessary (when using the clutch) because North American truck transmissions don't have syncros. That other information is nonsense. If you can float... fine. A properly used clutch should last until the engine needs a rebuild... or longer.

    You're right, slipping the clutch is not the best, but sometimes it is unavoidable.
     
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  4. Voodoo Pyg

    Voodoo Pyg Oink! Oink!

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    I really wish I could answer this. I haven't used a clutch so long in a truck until it's ridiculous. Haven't double clutched since school actually. I prefer to float. But I only use the clutch for starting, stopping, and reversing. That's' all.
     
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  5. JReding

    JReding Road Train Member

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    Do whatever you're most proficient at. Shifting a truck transmission, when properly done, can be as smooth or smoother than the shifting of a typical car transmission.
     
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  6. Final Drive

    Final Drive Road Train Member

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    Keeping clutch properly adjusted also helps on the longevity.
     
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  7. Ke6gwf

    Ke6gwf Medium Load Member

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    My truck has a Start pedal, a Stop pedal, and a Go Faster pedal.

    I usually only use the Go Faster pedal (and the related Go Slower switch), because it is much easier to replace Go Faster consumable than to replace the Start and Stop consumables (I am a diesel mechanic, and every time I have tried refilling the clutch and brake housing, the quarters just fall out the bottom, and then I just have to take it all apart anyway and stuff a bunch of money inside...)

    Yes, there are times when you have to do an extended Start, but that can take years off the time until you have to stuff more money inside, so do your best to avoid it, or moderate it.
     
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  8. x1Heavy

    x1Heavy Road Train Member

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    Clutches are cheap. Clutches never break. They will go out of adjustment now and then giving you fair warning when your pedal lies on the floor every time you tried to use it just before it quits.

    Never engage the clutch retarder or braking unless hunting for a gear at a FULL stop ready to move. The rig should click and lean a little to one side when you get it in.

    Most of the time double clutching or floating done right is not a problem.

    Ive had clutches go out from adjustment over time on older trucks, it's not a big deal, an hour underneath with adjustment and go. I never had a clutch totally fail. I have smoked them badly in racing situations with bobtail which is normal. When they pour black smoke like that, it's about 10,000 miles burned off them... Considering you run hundreds of thousands on em... eh...

    If anything goes out on the final drive it's going to be either the interlock or the axles.
     
  9. MACK E-6

    MACK E-6 Moderator Staff Member

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    Riding the clutch is certainly a bad thing. What you're referring to as far as going through a wash bay is more commonly called "feathering". That isn't as bad as riding and sometimes can't be helped. That's just nature of our job.

    When you double clutch, depressing only about half way is usually sufficient. NEVER push it all the way down.

    As you mentioned, inside the transmission there is a device called a "clutch brake". What this does is stops the rotation of the transmission internals so you can get it in gear. I'm sure you've heard the classic descending grind as a truck prepares to take off. This is because some idiot somewhere along the line wore the clutch brake out.

    The truly sad part is oftentimes drivers haven't a clue why this happens. They just think a truck is for whatever reason SUPPOSED to grind as it goes into gear.

    The only time you EVER want to push a clutch pedal to the floor is while sitting still. If you do this while moving, what little friction material is on the clutch brake will then be used to try and stop the rotation of the entire driveline, which kills them fast.

    Back in olden days, clutch brakes were controlled not by the bottom of the range of pedal travel, but by a button on the shifter. Frankly, I wish we could go back to that.
     
  10. street beater

    street beater Road Train Member

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    My clutch brake was abused by no nothing drivers before my time, luckily it still works but i have to sit on it for longer than I should have to... once in a while i still have to grind bump it into 1st, then it will take 2nd or third....
     
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  11. MACK E-6

    MACK E-6 Moderator Staff Member

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    When it gets to the point of having to shut the truck off, and start it back up with the clutch pedal pressed to get it in gear, I'd say it's time to get that fixed. ;)
     
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