 | Home > Puma (Tdci) > Diff lock dissengaged in rough roads |
 
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| Glynparry25 Member Since: 16 Feb 2009 Location: Miserable Midlands Posts: 3015   
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The only way you won't get wind up is if you are loosing traction- means both wheels can turn together. so if you are on a regular dirt track you will either get windup or the vehicle will 'crab' (can result in a roll) where the wheels are trying to go the same speed. I have seen many Land Rovers and trucks with snapped half shafts when they have been going down a track in 3rd gear, diff lock and then BANG.
I advise not to do it as I have spent many an hour recovering and repairing vehicles because of this reason and would never want it to happen to anyone. I have driven defenders on 3 continents, from desert sand to artic snow drifts. The last thing on my mind is diff lock, unless I think I can't get out. If I get stuck because of traction at least I can dig/winch/recover out- once you snap a drive shaft you are stranded. Glyn |
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4th Mar 2009 4:33pm |
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| foz.in.oz Member Since: 31 Jul 2008 Location: Gladstone, QLD Posts: 64  
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Or you can remove the broken shaft engage the central diff lock and drive out Land Rovers are an addiction. Toyotas are for quitters. WWW.CQLROC.ORG |
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4th Mar 2009 10:14pm |
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| mhasting2004 Member Since: 07 Dec 2008 Location: Gosford Posts: 29 
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It might be a typical Aussie thing but I use the diff lock quite often at high speeds (100kmh) if the road has "wash board" corragations. There is no way IMHO you will wind up the drive train in these conditions as the tires are only touching the road half the time
 This is the whole point of increased speed on these types of roads as at slower speeds you will rattle to death. Good smooth and dry dirt roads the diff lock stays out as you will wind up the transmission quick smart as others have said.
With the diff lock in, the fender tends to 4 wheel drift around corners while with it out it can fish tail a bit more... depends on the thrill you are chasing. The Lock engage on my Puma is a bit "weak" compared to our old TD5 so the linkage may be a bit out. Need to check Cheers MArk |
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5th Mar 2009 7:33am |
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| Eduardo Member Since: 28 Aug 2008 Location: Regi贸n Metropolitana Posts: 2110 
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Mark,
We have more less the same problem here with some gravel roads here (in special for those used by heavy forest logging trucks that almost destroy the road corrugating it as you said) under this conditions we feel that the control with the diff lock engaged is better than without it. Anyway, taking the advice of Glyn I will be more cautious of when I will use the Diff Lock Cheers! Eduardo MY 2007 110 SW PUMA 2.4: Big Fog of 64' MY 1994 Jayco 1207 Folding camper: "El Tremendo"  Click image to enlarge |
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5th Mar 2009 11:37am |
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| MK Member Since: 28 Aug 2008 Location: Santiago Posts: 2415 
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I would stick with owners manual instructions on this issue. That is the whole point on having a non-torsen-like centre diff. In my opinion the 110" has enough wheelbase to drive like hell on harsh roads. Puma 110" SW
............................................................. Earth first. Other planets later |
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5th Mar 2009 11:56am |
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| Eduardo Member Since: 28 Aug 2008 Location: Regi贸n Metropolitana Posts: 2110
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Given a look at the Manual
"The differential should be locked when driving off-road on loose and slippery surfaces." "The differential should be unlocked for all normal road driving or as soon as a hard grippy surface is reached when driving off-road." As usual, the problem here is what LR and we considers a normal road driving and loose and slippery surfaces... Cheers Eduardo MY 2007 110 SW PUMA 2.4: Big Fog of 64' MY 1994 Jayco 1207 Folding camper: "El Tremendo" Click image to enlarge |
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5th Mar 2009 12:27pm |
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| MK Member Since: 28 Aug 2008 Location: Santiago Posts: 2415
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how much tire pressure do you use? Anyway, from all 4x4 vehicles I had the chance to drive (88", 109", Suzuki, Terracan, several pick-ups) the long wheelbase LR磗 are far the most stable ones. Puma 110" SW
............................................................. Earth first. Other planets later |
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5th Mar 2009 1:00pm |
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| Fontuin Member Since: 11 Sep 2008 Location: South Africa Posts: 29 
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Loose slippery surface would be ice, snow, gravel even perhaps wet tar, as long as the wheels can slip to make up for any difference in speed between them then you should be fine, I use my CDL and have been using it on gravel roads at 100km/h for over 10 year snow with no problems or even a hint of drive train wind up, the vehicle is far more stable on gravel with CDL locked. Normal driving would be dry tar or concrete where the wheel can not slip to make up for any differnce in speed between them. Drive train wind up is noticable within a few meters on surface like this if you turn, the vehicle stugles to turn. I drive a pretty bad track after a section of gravel once a week, I turn my CDL off on the track because it is quite rocky and although it is uneven I have picked up signs of drive train wind up on this section, on the gravel section it is on becuase the gravel is loose from the high speed driving done on it by many vehicles. |
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5th Mar 2009 1:54pm |
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| Eduardo Member Since: 28 Aug 2008 Location: Regi贸n Metropolitana Posts: 2110
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As per users manual 30 in the front and 45 in the back if I remember well Eduardo MY 2007 110 SW PUMA 2.4: Big Fog of 64' MY 1994 Jayco 1207 Folding camper: "El Tremendo" Click image to enlarge |
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5th Mar 2009 2:04pm |
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| MK Member Since: 28 Aug 2008 Location: Santiago Posts: 2415
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I rekon 45 psi is stated in the manual. I never used that much, at the most 35 on the highway. Just under 30 on dirt roads. Puma 110" SW ............................................................. Earth first. Other planets later |
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5th Mar 2009 3:04pm |
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| Eduardo Member Since: 28 Aug 2008 Location: Regi贸n Metropolitana Posts: 2110
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MK
I also found it high, but I try to stick in the parameters of the users manual (you know, for guarantee issues  )
Regards Eduardo MY 2007 110 SW PUMA 2.4: Big Fog of 64' MY 1994 Jayco 1207 Folding camper: "El Tremendo" Click image to enlarge |
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5th Mar 2009 4:04pm |
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| MK Member Since: 28 Aug 2008 Location: Santiago Posts: 2415
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Which warranty? Your kidneys?
Try with 30 and you`ll have better handling on dirt roads. Puma 110" SW ............................................................. Earth first. Other planets later |
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5th Mar 2009 5:24pm |
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| Sonic3d Member Since: 28 Jan 2008 Location: Ross on Wye Posts: 1505  
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Have you ever tried driving a Defender with only front wheel drive offroad  i can tell you it does`nt go much 
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5th Mar 2009 5:40pm |
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| Eduardo Member Since: 28 Aug 2008 Location: Regi贸n Metropolitana Posts: 2110
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MK In my opinion there is not too much difference between 30 and 45 in the back in bouncing (bounce anyway). But in the front an increase of the pressure is noted inmediately (I put 35 by error instead 30 and was terrible). Why the manual stated 45 instead of a lower pressure? Some thought? May be fuel consumption or something like that? Anyway I will be with the dealers on Wednesday to see this problem and a noise in the clutch. Cheers Eduardo MY 2007 110 SW PUMA 2.4: Big Fog of 64' MY 1994 Jayco 1207 Folding camper: "El Tremendo" Click image to enlarge |
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5th Mar 2009 7:26pm |
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