Wednesday, Dec 23, 2009 at 01:06
Heres somthing I cut and pasted, Hope it helps
"ALWAYS use the clutch in ALL gear changes".
Some of the older style rto910's and rto913direct boxes could be driven with out a clutch but damage was sill there, Plenty of 'cowboys' out there will tell that "we non't need clutches they are only for sisseys" wrong if you do an endorsment with any Heavey vehcile instructor and do not use the clutch you will FAIL
Here Is some tips from the notes i hand out when training Road Train drivers for thier endorsments.
**** IMPORTANT***.Always preselect all range shifts when upshifting or downshifting. the preselection requieres that the range lever is moved to the needed position before starting the shift.
Preselected range shifts are completed auto maticly as the gear stick is moved through the neutral position and into the next gear, This preselection of ALL range shifts prevents damage to the gear box and provides a much smoother shift.
*The Range lever selects LO or HI
ranger And is used once during the up shift sequence and once during the downshift sequence.
* SPLITTER SHIFT*
* When in LO or HI range the ratios can be split by useing the splitter button The Lo range "L: rearward position privides for LO to 4th gear.the LO range "HI" forward postion splits each of these gears giving 10 ratios in LO range.
The HI range "L" rearward position povides for 5th too 8th gear The HI range "H" forward postion splits each of these gears privding 8 ratios in HI range 18 progressive ratios can be obtained.
*The clutch Brake*
Most trucks will have one of these.the clutch brake is applied be depressi ng the clutch pedal al the way to the floor. When applied the brake slows down and can stop the transmission frount box gearing.This make for easer initial gear selection from standstill.
***NEVER**** use the clutch brake when upshifting or down shifting. Only to be used for initial gear engagment when standing still.
A coulpe of quick tips.
Awayes select an initial starting gear that provided sufficent reduction for load and terrain.
Always use normal double-clutching procedures when making lever shifts.
Never slam or jerk the gear stick to complete gear engagments
Never coast with the gear stick in the neutral position.
Never move the range lever with the gear stick in neutral whilst the vehicle is moving.
Never make a range shift whilst in reverse.
Never downshift at too high a road speed.
Never make a splitter shift whist moving in reverse
UPSHIFT PROCEDURE
CAUTION..Never move the range lever or splitter button with the gearstick in neutral while the truck is moving.
Splitter shift.LO range "L" to LO range "H"(LO "L" to LO "H")
1. preslect just before makingan upshift by moving the button forward while maintaining accelerator position.
2. Then immediately release the accelerator, depress the clutch pedal once to break the torque release the pedal to reengage the clutch, allow the engine to decelerate until the shift is complete. continue driving or upshifting the transmission shifts from "L" to "H" when synchronouns is reached.
Combination lever and splitter shift. LO range"H" to LO range "L"
(LO "H" to 1st "L")
3.Pre select just before making an upshift by moving the splitter button rearwards while maintaing accelerator position.
4.Move the shift leaver, double-clutching to the 1st gear position.
NOTE. if the splitter is not moved the gear box 1st HI once the final clutch engagement is made.
5. Continue upshifting through the shift pattern. Double-clutching during lever shifts, and single -clutching split shifts while the leaver is in the same position.
Comination lever and splitter shift, Lo range "H" to HI range "L" (4th HI to 5th LO) Range change
6.preselect just before making the upshift by moving the button rearwardswhile maintaining accelerator position.
7. pull up the range lever move the gear stick double-clutching to 5th slot . If the splitter is no moved the transmissin will be in 5th "H" once the final clutch engagment is made.
8. splitting the 'top' box is the same as splitting the bottom box.
Time for brekky will put more up soon the down shift sequence
Cheers
AnswerID:
396143
Follow Up By: Richard Kovac - Wednesday, Dec 23, 2009 at 01:30
Wednesday, Dec 23, 2009 at 01:30
10. alway drive someone else's truck
FollowupID:
664855
Follow Up By: Member - David G (WA) - Wednesday, Dec 23, 2009 at 19:26
Wednesday, Dec 23, 2009 at 19:26
Sorry to have to tell you this ole mate but if you preselect the earlier model r/rs 900 and 12.5 series you will most definately have a great deal of noise and no motion as the box will neutralise and you will have to stop the vehicle and start again preselect only arrived on the scene when the 18speed box arrived. also i have owned and driven all makes of truck gear boxes and have yet to have destroyed any through non use of the clutch but as you say non use when taking a
test will fail you.
To you all a safe and happy xmas and new year
Dave
FollowupID:
664941
Follow Up By: Member - ross m (WA) - Thursday, Dec 24, 2009 at 09:12
Thursday, Dec 24, 2009 at 09:12
YES ,when I was learning how to drive a truck,on the last day the instructor (and owner) showed me how to shift the RR without the clutch
FollowupID:
665017