Truck Driving Jobs

kimoyo · #1 12-31-2007, 05:55 AM

I having a slight issue that I'm trying to figure out. After shifting when I'm coming off the clutch I sometimes get a bump. It doesn't feel like the jolt when coming off the clutch too quick. My instructor says he's off the clutch when he pushes on the gas pedal, he also feels sometimes I'm not running up the rpm's enough before shifting. Any ideas what that bump is? The next time I'm driving I'll try some different approaches but it seems when I start gasing the truck while I'm coming off the clutch I get the smoothest response. Or is my foot just coming off to quick? I feel like I'm already taking forever to get my foot off the clutch and on the gas. Thanks!

Part Time Dweller · #2 12-31-2007, 12:34 PM

Who uses the clutch for shifting? Is that some training school thing? :?

DaveP · #3 12-31-2007, 12:48 PM

Quote:

Originally Posted by Part Time Dweller

Who uses the clutch for shifting? Is that some training school thing? :?

Have to use the clutch during CDL road test in Alabama

Roadhog · #4 12-31-2007, 01:10 PM

Are you feeling the bump in the clutch pedal, or the shifter?

kimoyo · #5 12-31-2007, 02:11 PM

I actually got use to power shifting for a few days and then tried to go back clutching and had the worse day. I have a 7 classes until my dmv test so I'll make sure I get it back though.

roadhog - I'm not sure how to tell where the bump is coming from. Its like the truck jumps forward a little or jolts. The jolt is only slight (not a smooth ride) but not as bad as when someone just jerks their foot off the clutch. On Wednesday I'll just ask to do a bunch of clutching on an isolated road. Maybe I'm still not taking my foot off slow enough at the engage point or having a good feeling for exactly where the engage point is. I just spoke with the owner of my school and he also doesn't gas until his foot is off the clutch entirely. I might be imagining my engage point too low and pushing the clutch in to far when shifting.

Thanks for the help so far everyone.

DaveP · #6 12-31-2007, 02:53 PM

Sounds like you may be "jamming" it into gear slightly under the correct rpm.

ben45750 · #7 12-31-2007, 09:48 PM

Does the bump feel like it's coming from the drive-trane? Sometimes you can feel a bump in the drive line when you "stomp" on the throttle instead of smoothly applying the throttle after shifting a gear.

Just as if you quickly tap the throttle at 55-60 in high gear when your empty.

kimoyo · #8 12-31-2007, 10:33 PM

DaveP - It could be, thats what my instructor was saying but it happens sometimes when I'm going up to 2000 rpm.

ben45750 - It does feel like that little jolt/knock. So your saying after my first clutch and its in neutral, when I make my second clutch I pushing down to hard and thats causing the bump regardless of how I release the clutch after its in gear. If thats what your saying then that could be it. Because when I was floating sometimes I would do a clutch but it was extremely light because everything was so smooth and I wasn't pushing down on the clutch that far. Then when I went back to double clutching I started messin up and everything went down hill from there.

When you say apply the clutch smooth you still mean quickly though? Is it the speed or depth that is the issue? I try to get the adams familly song in my head and go with a 1,2 speed

Thanks for the help, I really appreciate it.

TruckerChris · #9 01-01-2008, 03:58 AM

Quote:

Originally Posted by kimoyo

DaveP - It could be, thats what my instructor was saying but it happens sometimes when I'm going up to 2000 rpm.

ben45750 - It does feel like that little jolt/knock. So your saying after my first clutch and its in neutral, when I make my second clutch I pushing down to hard and thats causing the bump regardless of how I release the clutch after its in gear. If thats what your saying then that could be it. Because when I was floating sometimes I would do a clutch but it was extremely light because everything was so smooth and I wasn't pushing down on the clutch that far. Then when I went back to double clutching I started messin up and everything went down hill from there.

When you say apply the clutch smooth you still mean quickly though? Is it the speed or depth that is the issue? I try to get the adams familly song in my head and go with a 1,2 speed

Thanks for the help, I really appreciate it.

2000rpm? That's a little high to be shifting at whether it's down or up...

Uturn2001 · #10 01-01-2008, 06:47 AM

My guess is that you are a little too fast getting back on the throttle after a shift.

It sounds like what is happening is that you are not fully off the clutch pedal before giving the truck some juice.