LE1erRE:
i saw guy on quite a steep hill trying to reverse into side road with artic. not tight at all and no cars or traffic around but he just couldn’t seem to do it. i gather maybe a newbee. unless downhill reverse is awkward.
trailer needed to go to left.
As Dipper Dave’s spot on post.
So, loaded blindside uphill into an entrance tight enough its getting on for a jacknife, thats the worse reverse you can get, we have one of those where its uphill and up an even tighter slope into the customers gateway.
This is THE scenario where the auto box of whatever make (yes even Volvo) show their maneuvering failings in spades, infinitely more control with a manual for such things, but they are disappearing fast and many new drivers will never find this out for themselves, others on this site don’t agree with me on this, and thats fair enough everyone’s opinion is valid (and shouldn’t be ridiculed but often is), you newer drivers make your own minds up.
We’ve had clutches ruined at this particular delivery point and how we haven’t had a broken half shaft i do not know, and this with experienced drivers.
You have to prepare the vehicle for this type of reverse before attempting it, not preparing is why you see artics struggling on even minor slopes in MSA’s to make relatively easy reverses, let alone attempting on a hill side road.
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get full air pressure up before you start, unless you are an expert, and so called experts ■■■■ reverses up just as often, you aint going to do this in one shove, and you will use lots of air and its debatable even with the fastest two stage compressor whether it will keep up with several heavy shunts without having to stop and blow it up again.
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switch TC (traction control) or ASR (anti skid reduction, i think) OFF, soon as the vehicle senses wheelslip it will cut the power, and its cruel enough to the clutch without it having to make several restarts due to nothing but a slight wheelspin, switching off will allow the drive wheels to slip without cutting power.
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if you have a 3 axle tractor unit dump the tag/mid lift air, this transfers all the weight from that axle onto the drive axle, this cuts down on wheelspin and works hand in hand with point 2, and makes the vehicle easier to turn.
3a. some trailers have a lifting front axle, some of those have a lever to operate that lifter and again on some of those the axle will lift eve if fully loaded, this again transfers weight onto that drive axle, and lessens trailer drag, spo you can see if you can lift the unit tag/mid lfit and the trailer front axle you’re now driving/turning 3 axles with one instead of 5 axles with one.
- Do not be tempted to use the diff lock on the above reverse scenario, serious damage will result almost without fail.
The above applies (except point 4, when using the diff lock sometimes helps) to getting traction on loose surfaces and ice/snow.
Mainly though, learn your vehicle long before you need to make extreme maneuvers like this, and i know i labour this point, for winter driving epecially learn how to drive your auto gearbox in manual mode accurately, and the exact speed that allows dumping of the mid lift/tag axle air, knowing things like this will mean getting up that icy hill with a good run up or coming to a slippery standstill less than half way up…if you can envisage yourself, you’re hitting that hill as hard as you dare, you’re pushing/dragging 5 axles weighing roughly 33 tons combined with one axle weighing 10 tons, as the hill slows you up and you get down to about 20mph the mid lift weight transfer button will come into use (won’t work above its set speed on the vast majority of tractors, but it will on old square Actros ), so if you use that you’ve suddenly got a drive axle weighing around 13 tons pulling pushing 30 tons, its not a great increase but better than 3 tons the other way.
If on a really slippery slope and you happened to have a trailer with a front lifter that will lift loaded (some will, some won’t) you could end up with about 15 tons imposed on the drive axle and 1 less undriven axle on the ground…no you wouldn’t go down the road at warp 6 like this but when its touch and go in a blizzard getting up a steep hill i assure no copper or VOSA officer is going to have a go at you for doing something like this to get up that hill whe the alternative is a blocked road in fast worsening conditions.
Learn your vehicle before you need to know exactly what you can do with it, you cannot learn things like this in the middle of a maneuver or blizzard.