Double Clutch? Hmmmm
Topic 19327 | Page 1
Basically its "clutch neutral clutch shift"... And " clutch neutral accelerator clutch shift" to down shift.
I don't know why. I never drove stick before and did what I was told. Lol
What I'm finding is people stick with what is comfortable for them. Although many drivers say they float. Many others say they clutch. I still clutch most of the time especially downshifting. Especially in traffic I clutch. Its not intentional. Just something I notice. I probably have some thought in the back of my head of more control with the clutch.
Hello OTR ,
As Rainy said, double clutching is merely "clutch, neutral, clutch".
The reason for this is that heavy duty transmissions, such as those found in a big truck, do not have a synchro-mesh transmission. A synchro-mesh transmission has synchronizers on the gears that allows the gears to slow down and mesh together when you shift and also allow you to downshift at any road speed/RPM combination . The synchronizers are typically made of brass I think which is a softer metal than the gears, this may be one reason why heavy duty transmissions lack them; because of the amount of torque that is passed through the gears would be very abusive to the synchronizers and would require a larger transmission case to accommodate them.
By double clutching, you are giving time for the counter shaft in the transmission time to slow down so that the gears will mesh. In a HD transmission without synchros, the gears will grind if the RPM AND road speed are not closely matched. When down shifting you also need to rev match the engine RPM to the road speed for the gear you are selecting. I have driven a stick shift all my life and I rev match the gears in my own car when downshifting, not because I "have" to, but because it is easier on the drivetrain and there is no engine "surge" as the RPM's catch up to the road speed.
At one time, even cars and light duty trucks had to be double clutched.
OTR:
Over The Road
OTR driving normally means you'll be hauling freight to various customers throughout your company's hauling region. It often entails being gone from home for two to three weeks at a time.
Double Clutch:
To engage and then disengage the clutch twice for every gear change.
When double clutching you will push in the clutch, take the gearshift out of gear, release the clutch, press the clutch in again, shift the gearshift into the next gear, then release the clutch.
This is done on standard transmissions which do not have synchronizers in them, like those found in almost all Class A trucks.
Double Clutching:
To engage and then disengage the clutch twice for every gear change.
When double clutching you will push in the clutch, take the gearshift out of gear, release the clutch, press the clutch in again, shift the gearshift into the next gear, then release the clutch.
This is done on standard transmissions which do not have synchronizers in them, like those found in almost all Class A trucks.
HOS:
Hours Of Service
HOS refers to the logbook hours of service regulations.
There are lots of YouTube video's that might make it a little easier to understand. Just do a search on double clutch.
Good luck in your new venture.
Double Clutch:
To engage and then disengage the clutch twice for every gear change.
When double clutching you will push in the clutch, take the gearshift out of gear, release the clutch, press the clutch in again, shift the gearshift into the next gear, then release the clutch.
This is done on standard transmissions which do not have synchronizers in them, like those found in almost all Class A trucks.
As stated within my profile, I'm a class B tri-axle dump truck driver going OTR very soon. Never received formal (CDL school) training. I was never taught double clutching method.
My new company stated that "all DOT driving testing must use the double method". Well I guess not Texas, or at least my Texas DOT examiner. I've floated since day one, albeit a tad painful for the old trick at first!
A bit long winded to get to question, sorry......" what the hack is double clutching and why?"
Thanks in advance for response/ advise...
I think it depends on the DOT examiner. I was taught to float from day 1 and floated during my driving test. The examiner say anything. I passed and still float today. Double clutching seems like a bit too much movement for me
CDL:
Commercial Driver's License (CDL)
A CDL is required to drive any of the following vehicles:
- Any combination of vehicles with a gross combined weight rating (GCWR) of 26,001 or more pounds, providing the gross vehicle weight rating (GVWR) of the vehicle being towed is in excess of 10,000 pounds.
- Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing another not in excess of 10,000 pounds.
- Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver.
- Any vehicle required by federal regulations to be placarded while transporting hazardous materials.
OTR:
Over The Road
OTR driving normally means you'll be hauling freight to various customers throughout your company's hauling region. It often entails being gone from home for two to three weeks at a time.
DOT:
Department Of Transportation
A department of the federal executive branch responsible for the national highways and for railroad and airline safety. It also manages Amtrak, the national railroad system, and the Coast Guard.
State and Federal DOT Officers are responsible for commercial vehicle enforcement. "The truck police" you could call them.
Double Clutch:
To engage and then disengage the clutch twice for every gear change.
When double clutching you will push in the clutch, take the gearshift out of gear, release the clutch, press the clutch in again, shift the gearshift into the next gear, then release the clutch.
This is done on standard transmissions which do not have synchronizers in them, like those found in almost all Class A trucks.
Double Clutching:
To engage and then disengage the clutch twice for every gear change.
When double clutching you will push in the clutch, take the gearshift out of gear, release the clutch, press the clutch in again, shift the gearshift into the next gear, then release the clutch.
This is done on standard transmissions which do not have synchronizers in them, like those found in almost all Class A trucks.
You might have passed but I net you got points for it. Our examiners told us not to wear dark color pantsnso they could easily see the double clutching
Double Clutch:
To engage and then disengage the clutch twice for every gear change.
When double clutching you will push in the clutch, take the gearshift out of gear, release the clutch, press the clutch in again, shift the gearshift into the next gear, then release the clutch.
This is done on standard transmissions which do not have synchronizers in them, like those found in almost all Class A trucks.
Double Clutching:
To engage and then disengage the clutch twice for every gear change.
When double clutching you will push in the clutch, take the gearshift out of gear, release the clutch, press the clutch in again, shift the gearshift into the next gear, then release the clutch.
This is done on standard transmissions which do not have synchronizers in them, like those found in almost all Class A trucks.
I failed my first driving test, because I floated all through school, and hadn't gotten my DC'ing down as muscle memory. Our examiners were instructors at the school (they were also a 3rd party testing center).
While NOT in the FMSCA Regs (that I could find) as a REQUIREMENT, but it IS in the states driving manual.
Texas CDL Manual for example:
13.1.11(a) – Clutch Usage (for Manual Transmission)
Always use clutch to shift.
Double-clutch when shifting.
Do not rev or lug the engine.
Section 13 – On-road Driving Page 13-3 Version: July 2013
I suspect ALL STATES are going to be UNIFORM on this. If the vehicle HAS A CLUTCH you must USE IT and you must DOUBLE CLUTCH.
While examiners may vary on how strict they are - it IS actually required.
Rick
CDL:
Commercial Driver's License (CDL)
A CDL is required to drive any of the following vehicles:
- Any combination of vehicles with a gross combined weight rating (GCWR) of 26,001 or more pounds, providing the gross vehicle weight rating (GVWR) of the vehicle being towed is in excess of 10,000 pounds.
- Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing another not in excess of 10,000 pounds.
- Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver.
- Any vehicle required by federal regulations to be placarded while transporting hazardous materials.
Double Clutch:
To engage and then disengage the clutch twice for every gear change.
When double clutching you will push in the clutch, take the gearshift out of gear, release the clutch, press the clutch in again, shift the gearshift into the next gear, then release the clutch.
This is done on standard transmissions which do not have synchronizers in them, like those found in almost all Class A trucks.
Fm:
Dispatcher, Fleet Manager, Driver Manager
The primary person a driver communicates with at his/her company. A dispatcher can play many roles, depending on the company's structure. Dispatchers may assign freight, file requests for home time, relay messages between the driver and management, inform customer service of any delays, change appointment times, and report information to the load planners.
Some examiners just want to see you double clutch one time so you get the credit and then after that you can do what you want. I would just learn it for your drive test because doing one thing consistently is safer than changing things up and risking making mistakes. Check out this you tube video. "Dootson school of trucking double clutching" by Phil. It's very good. Phil explains double clutching so well.
Double Clutch:
To engage and then disengage the clutch twice for every gear change.
When double clutching you will push in the clutch, take the gearshift out of gear, release the clutch, press the clutch in again, shift the gearshift into the next gear, then release the clutch.
This is done on standard transmissions which do not have synchronizers in them, like those found in almost all Class A trucks.
Double Clutching:
To engage and then disengage the clutch twice for every gear change.
When double clutching you will push in the clutch, take the gearshift out of gear, release the clutch, press the clutch in again, shift the gearshift into the next gear, then release the clutch.
This is done on standard transmissions which do not have synchronizers in them, like those found in almost all Class A trucks.
Thanks ALL for the input and feedback. Double clutching it shall be!..Think I've done it by mistake once or twice... Also thinkin' I got some bad habits that will need slight adjusting. All good, I'm all ears and game.
Double Clutch:
To engage and then disengage the clutch twice for every gear change.
When double clutching you will push in the clutch, take the gearshift out of gear, release the clutch, press the clutch in again, shift the gearshift into the next gear, then release the clutch.
This is done on standard transmissions which do not have synchronizers in them, like those found in almost all Class A trucks.
Double Clutching:
To engage and then disengage the clutch twice for every gear change.
When double clutching you will push in the clutch, take the gearshift out of gear, release the clutch, press the clutch in again, shift the gearshift into the next gear, then release the clutch.
This is done on standard transmissions which do not have synchronizers in them, like those found in almost all Class A trucks.
TWIC:
Transportation Worker Identification Credential
Truck drivers who regularly pick up from or deliver to the shipping ports will often be required to carry a TWIC card.
Your TWIC is a tamper-resistant biometric card which acts as both your identification in secure areas, as well as an indicator of you having passed the necessary security clearance. TWIC cards are valid for five years. The issuance of TWIC cards is overseen by the Transportation Security Administration and the Department of Homeland Security.
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As stated within my profile, I'm a class B tri-axle dump truck driver going OTR very soon. Never received formal (CDL school) training. I was never taught double clutching method.
My new company stated that "all DOT driving testing must use the double method". Well I guess not Texas, or at least my Texas DOT examiner. I've floated since day one, albeit a tad painful for the old trick at first!
A bit long winded to get to question, sorry......" what the hack is double clutching and why?"
Thanks in advance for response/ advise...
CDL:
Commercial Driver's License (CDL)
A CDL is required to drive any of the following vehicles:
OTR:
Over The Road
OTR driving normally means you'll be hauling freight to various customers throughout your company's hauling region. It often entails being gone from home for two to three weeks at a time.
DOT:
Department Of Transportation
A department of the federal executive branch responsible for the national highways and for railroad and airline safety. It also manages Amtrak, the national railroad system, and the Coast Guard.
State and Federal DOT Officers are responsible for commercial vehicle enforcement. "The truck police" you could call them.
Double Clutch:
To engage and then disengage the clutch twice for every gear change.
When double clutching you will push in the clutch, take the gearshift out of gear, release the clutch, press the clutch in again, shift the gearshift into the next gear, then release the clutch.
This is done on standard transmissions which do not have synchronizers in them, like those found in almost all Class A trucks.
Double Clutching:
To engage and then disengage the clutch twice for every gear change.
When double clutching you will push in the clutch, take the gearshift out of gear, release the clutch, press the clutch in again, shift the gearshift into the next gear, then release the clutch.
This is done on standard transmissions which do not have synchronizers in them, like those found in almost all Class A trucks.