So at max speed,is it the norm to be on the edge of the green band on the rev counter ?(tachometer)
Frecin sure the gearbox has been a wrong un since new.
12 speed Arocs running @ 1700 rpm 55.9mph.
1700 does seem a bit on the high side. I’d have thought 1200 would seem a bit more likely, but the Arocs is more of a grafter than a cruiser.
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My old atego used to do the same, like she was searching for a final gear…
PaulNowak:
1700 does seem a bit on the high side. I’d have thought 1200 would seem a bit more likely, but the Arocs is more of a grafter than a cruiser.Sent from my iPhone using Tapatalk
1200 is the start of the Green ,thank frec i don"t do much distance work anymore.
It can be an involved calculation between final drive ratio v transmission ratio.Generally it would be geared for top speed on the flat to co incide with the engine’s torque peak.It might then have a final drive option which trades higher engine speed on the flat in top for better performance and economy in the hills. 
Carryfast:
It can be an involved calculation between final drive ratio v transmission ratio.Generally it would be geared for top speed on the flat to co incide with the engine’s torque peak.It might then have a final drive option which trades higher engine speed on the flat in top for better performance and economy in the hills.
So is it revving too high or what then ?
put some bigger wheels on it; seriously though it does seem as though it has been spec’d for hilly countryside with the ratios closer together than standard, or does it also have stupidly low gears?
Arocs is normally shorter geared, higher reving, than the equivalent Actros, due to the more arduous work it’s designed for.
If you tell me the exact model it’s easy to check if it has the standard diff or if it is even lower geared than standard.
Suedehead:
Carryfast:
It can be an involved calculation between final drive ratio v transmission ratio.Generally it would be geared for top speed on the flat to co incide with the engine’s torque peak.It might then have a final drive option which trades higher engine speed on the flat in top for better performance and economy in the hills.So is it revving too high or what then ?
Probably not.Subject to the gearing it was supplied and ordered with.Bearing in mind that Germany has a 50 mph motorway limit and hilly terrain on many routes in and around the place.IE geared for German market conditions might explain it.
1700rpm is on the high side, that gearing would be suited to an urban vehicle or one that worked around the Peak District or similar, where low gearing wouldn’t matter as it seldom reached maximum speed.
It could well be specced for Europe, the MB spec program has lots of anomalies in it and you really have to check what you’re getting before you press go and send the order to the factory. I’ve seen chassis turn up with things like 1300x20 sand tyres instead or 295/80 22.5s because the salesman didn’t double check what he ordered.
Carryfast, you make an interesting point about Euro spec, people often used to quote that their lorry was “Dutch spec” as a way of saying it pulled like a train and a proper “Dutch spec” would pull better by virtue of its lower gearing, bearing in mind that with the exception of Belgium and Spain at 90km/h and GB at 60mph, all the other countries in Europe were 80km/h maximum speed.
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Suedehead:
Carryfast:
It can be an involved calculation between final drive ratio v transmission ratio.Generally it would be geared for top speed on the flat to co incide with the engine’s torque peak.It might then have a final drive option which trades higher engine speed on the flat in top for better performance and economy in the hills.So is it revving too high or what then ?
Without knowing either which engine it has or what it is it’s impossible to say.
If it has the 8 litre engine then that gearing may be right, if it’s a 16 litre then it’s definitely wrong. Likewise a 33■■ 6x6 will be much shorter geared than a 4x2 tractor. More information is required for an answer.
Suedehead:
Carryfast:
It can be an involved calculation between final drive ratio v transmission ratio.Generally it would be geared for top speed on the flat to co incide with the engine’s torque peak.It might then have a final drive option which trades higher engine speed on the flat in top for better performance and economy in the hills.So is it revving too high or what then ?
BEST REPLY AND ANSWER IVE SEEN ON THIS YET…WORLDS APART FROM BOTH ENDS OF THE SPECTRUM…PURE CLASS 
dieseldog999:
Suedehead:
Carryfast:
It can be an involved calculation between final drive ratio v transmission ratio.Generally it would be geared for top speed on the flat to co incide with the engine’s torque peak.It might then have a final drive option which trades higher engine speed on the flat in top for better performance and economy in the hills.So is it revving too high or what then ?
BEST REPLY AND ANSWER IVE SEEN ON THIS YET…WORLDS APART FROM BOTH ENDS OF THE SPECTRUM…PURE CLASS
SPEAK UP CALLER…
stupid question maybe, is it actually in top gear at 55mph and is it an auto?. I ask this because I had a demo scania 410 and it went up to 56mph but wouldn’t actually go into top at 56mph , manually putting it into 12th, it would hold for about a minute then drop straight down to 11th, and this is on the flat dual-carriageway or motorway.
now this thing had been driven for a couple of weeks like this and nobody had picked it up . went back to scania and it was a fault, sorted with a laptop.
tonyj105:
stupid question maybe, is it actually in top gear at 55mph and is it an auto?. I ask this because I had a demo scania 410 and it went up to 56mph but wouldn’t actually go into top at 56mph , manually putting it into 12th, it would hold for about a minute then drop straight down to 11th, and this is on the flat dual-carriageway or motorway.
now this thing had been driven for a couple of weeks like this and nobody had picked it up . went back to scania and it was a fault, sorted with a laptop.
Its a 12 speed auto and when on the limiter ,the display indicates 12,so i presume it has not got any more gears.
When it was in for its first inspection,i did mention that i thought the gearbox was seemed too be set up wrong but it fell on deaf ears.
Even in manual mode the gear change is ,shall we say . . sluggish.
Think its running on 385/80/22.25 tyres .
Edit . 315/70/22.5 tyres.
I’m with acd1202 on this then , must be due to it being an arocs, lower gearing for heavier duty work.
acd1202:
Suedehead:
Carryfast:
It can be an involved calculation between final drive ratio v transmission ratio.Generally it would be geared for top speed on the flat to co incide with the engine’s torque peak.It might then have a final drive option which trades higher engine speed on the flat in top for better performance and economy in the hills.So is it revving too high or what then ?
Without knowing either which engine it has or what it is it’s impossible to say.
If it has the 8 litre engine then that gearing may be right, if it’s a 16 litre then it’s definitely wrong. Likewise a 33■■ 6x6 will be much shorter geared than a 4x2 tractor. More information is required for an answer.
.
Its a 6x2 tag 300 hp.
As an aside,why is it badged as a 2530,when its a 26t gross?
Our manual 'box Isuzu Urban does 2700rpm at 55 mph. Quite why I don’t know but a mate used to drive an auto one (which he could stall rather easily) and that screemed in top gear.
Maybe to silence the rattles?
The exhaust brake on ours is very good though.