paul b:
i’ve yet to see a tyre fitter anywhere use a torque wrench! they’ll all tigten up with the gun and then give you a nice disclaimer warning that you must check the wheel after x amount of k’s covered and anything other than brand new whell rims WILL want tightening again.
always wonderd about torque settings, when you tighten the nut you actually stretch the the stud, the torque setting is there so you dont over stretch it but if the the studs have aready been over tightened previously surely that torque setting is no good?
Sorry Paulb,but it is down to you as the driver to go back to the tyre fitter’s to have the re-torque carried out.
hitch:
always put a bit of oil on the threads
this keeps them tight
How ironic. Shurley shome mishtake?!?!?!
Not entirely untrue.
Dust, grit and corrosion can inhibit the free rotation of a nut thereby ‘signalling’ back to the torque wrench a resistance that is not consistent with a correct clamping force.
An explanation I have found, in relation to vehicle wheels,
Applied torque is a measure of the tightness of a nut and bolt, but it is not actually the torque that holds the parts together. In fact the thread of a the fastener converts rotary motion into an axial load that stretches the bolt. This in turn creates a clamping force between the the face of the nut and the head of the bolt. It is this force that holds the joints together.
Therefore debris on the threads will resist the rotary motion and the correct clamping force will not be achieved.
it also stops the things seizing on for when you do need to get them off.
Here’s a question. From what i’ve seen all truck wheels seem to be standard types and use standard nuts. ie. you could take the wheel off a Scania and put on a merc. So do they all have a standard Torque for the wheel nuts and if so what is it?
The manual for the unit would probably tell you the torque setting for the unit wheels, but how would you know the trailer settings? they rarely come with a manual?
Dennis, not all wheels are the same, and nor are the types of fixings. From memory there are essentially three types of fixings, but I can’t remember the names of them. However, because the diameter of the studs are the same, then the torque setting for each type of fixing will be the same.
In the 1980’s, the then Institute of Road Transport Engineers, with money funded by the Transport industry itself, carried out an exhaustive research project regarding ‘wheel loss’. The results of the research, carried out over a period of years rather than months, was published under the title, “The lost Wheels Mystery”.
The DfT recently announced that it was to fund research into ‘wheel loss’. The response from the SOE (IRTE) was “Why?”
It’s already been done. The technology hasn’t changed. The nature of materials hasn’t changed. So why are our civil servants wasting money on researching matters that have already been fully investigated.
paul b:
i’ve yet to see a tyre fitter anywhere use a torque wrench! they’ll all tigten up with the gun and then give you a nice disclaimer warning that you must check the wheel after x amount of k’s covered and anything other than brand new whell rims WILL want tightening again.
always wonderd about torque settings, when you tighten the nut you actually stretch the the stud, the torque setting is there so you dont over stretch it but if the the studs have aready been over tightened previously surely that torque setting is no good?
Sorry Paulb,but it is down to you as the driver to go back to the tyre fitter’s to have the re-torque carried out.
my point was i’ve never seen a “tyre fitter” use a torque wrench!
However, because the diameter of the studs are the same, then the torque setting for each type of fixing will be the same
Sorry Krankee not true,the gun torque’s them up to 550,but on a re-torque it is a different setting depending on the type of truck.IE a setting for scania wiill be different from a MAN.How do i know this well my lad is a tyre fitter for ATS bellshill,and i’ll; get the setting’s for each truck from his manual on monday and hopefully get them up on here monday night for all to read.
. So why are our civil servants wasting money on researching matters that have already been fully investigated
no change here then m8,I’m sure it’s them trying to justify them being in a job.
my point was i’ve never seen a “tyre fitter” use a torque wrench
Well paul,the next time you get a tyre fitted/changed wait 30mins and you’ll see the fitter’s using it.They ( the fitters) will do a re-torque 30mins after tyre has been changed if you ask them to,but your truck must sit for 30mins before they can do it m8.So make sure you can affoard to wait that length of time before you ask them to.Failing that you are duty bound to ensure the re-torque is carried out after you have travelled the distance which they allow before re-torque is required.
It’s to allow the nut’s time to settle down,then they get re-torqued which saves you coming back to have this done or trying to find a dealer to do it for you whilst out on the road.Company’s like Exel,Bibby distribution and Somerfield’s have this policy.
i check mine myself on a regular basis, never heard of this wait half an hour bit before, always done mine after twenty or so miles
And how do you check your’s Paul I take it you have the correct tools to check them with you ie a re-torque tool
Fred:
Ever since one of our drivers accepted the word of the staff driver who handed him the keys with the words “I’ve done your checks mate” and eventually found himself following one of the trailer wheels down the road we’ve told all drivers that they should check everything, themselves. Some clients (inculding the one who had the lucky escape) provide a torque wrench, most don’t. Many don’t even allow time for the inspection before they start pushing the driver to “get yourself away”
I also tell drivers to inspect the wagon and trailer for any damage that may be blamed on them at the end of the shift - mobile phones with cameras are very handy in that respect.
worked already by a firm where i had to buy engine oil myselfe.
when i overtook the Lorry where already 10 liter missing.the driver before me said the computer will tell me when oil is needed,as no one did know how to check engineoil
paul b:
i check mine myself on a regular basis, never heard of this wait half an hour bit before, always done mine after twenty or so miles
20 miles or 50 km
if wheelnuts settle down and you can turn they further without driving means that that thirt is between the wheels.outerwise will steel or aluminium not settle down like rubber
However, because the diameter of the studs are the same, then the torque setting for each type of fixing will be the same
Sorry Krankee not true,the gun torque’s them up to 550,but on a re-torque it is a different setting depending on the type of truck.IE a setting for scania wiill be different from a MAN.How do i know this well my lad is a tyre fitter for ATS bellshill,and i’ll; get the setting’s for each truck from his manual on monday and hopefully get them up on here monday night for all to read.
. So why are our civil servants wasting money on researching matters that have already been fully investigated
no change here then m8,I’m sure it’s them trying to justify them being in a job.
sorry
first:“Wheelnuts on 10 ton Axle usually fixed with 64kilogram per meter!” or 640NM
If Tyrefitter waits before he retorques Wheelnuts has that to do that Compressor has to pump Air,as last few Wheelnuts may not really ok fixed,as pistol of that size needs too much Air as they had enough for 10 Wheelnuts
first:“Wheelnuts on 10 ton Axle usually fixed with 64kilogram per meter!” or 640NM
If Tyrefitter waits before he retorques Wheelnuts has that to do that Compressor has to pump Air,as last few Wheelnuts may not really ok fixed,as pistol of that size needs too much Air as they had enough for 10 Wheelnuts
Most wheel nuts on 10 ton axles have a torque setting of 640nm.
If a tyre fitter just does each nut up one after the other with the air wrench then the last ones wont be as tight as the first as the gun will be running low on air after the first 8 nuts, so you should wait a few seconds between each nut for the compressor to catch up. Most places buy the smallest air compressor they can get away with.
first:“Wheelnuts on 10 ton Axle usually fixed with 64kilogram per meter!” or 640NM
If Tyrefitter waits before he retorques Wheelnuts has that to do that Compressor has to pump Air,as last few Wheelnuts may not really ok fixed,as pistol of that size needs too much Air as they had enough for 10 Wheelnuts
quote=“kitkat”] Sorry but can someone translate [zb] this means
I think that is where the ‘Life in the UK Test’ should come in. Hell knows what that is supposed to mean.
I take it you have the correct tools to check them with you 
