Muzza
Member Since: 24 Sep 2007
Location: Sale
Posts: 10
  
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Hi all,
The D3 is my first 4x4 with centre diff and I wonder how you are supposed to stop on a very steep and slippery slope to get out and check the track ahead. With a transfer case (on my old 4WD'd) rather than a centre diff the rear wheels handbrake is also stopping the front wheels from turning so the vehicle stays put. With a centre diff the front wheels can roll by rotating the shaft into the transmissin from the centre diff. The obvious answer is to put the transmission into park. This works but in effect you are holding the vehicles weight on the transmission park brake. Is it strong enough? Most cars insist on the handbrake being used to hold the weight so as not to damage the transmission park mechanism.
Any clues, if I dont use park then the D3 just slides down the hill and beeps "Help me, I am falling" but keeps sliding.
THANKS If the EARTH was flat I would not need my DISCO 3
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 31st Mar 2008 11:50 am |
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Gareth
Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26742
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I had this happen to me on an icy slope. The Park Brake was applied, gear to neutral. Took foot off brake and she slid forward with the rear wheels locked. When gear is put into Park, it locked the transmission and she held ok.
There is no ice around here at the moment to try this out, but I suspect if you select Rock Crawl on the TR dial, it will lockup the centre diff anyway. I'm not 100% sure on this, but give it a try 
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| 31st Mar 2008 12:19 pm |
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norto
Member Since: 10 Apr 2006
Location: batemans bay
Posts: 1605
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Im not the sharpest tool in the shed, but
Why wouldnt you leave an automatic vehicle in park Pete
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| 31st Mar 2008 12:36 pm |
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ianv
Member Since: 20 Dec 2007
Location: Bungendore, New South Wales
Posts: 338
 
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Hi Norto,
The logic of not putting an Auto 4wd in Park on a steep slope is that the force on the lock mechanism can make it not possible to take back out of park. This was an issue in most vehicles, I have not tested to see if Landrover has got around it. You need to try this with some one else around or a winch to tow your self up the slope again if need be.
I suspect that it won't be an issue based on the amount of design work around the rest of the vehicle.
Ianv TDV6
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| 31st Mar 2008 12:44 pm |
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Muzza
Member Since: 24 Sep 2007
Location: Sale
Posts: 10
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Using the park position in the auto certainly stops the car but if it is not strong enough and gives way when you are outside the car then good by D3.
I suspect that it is strong (everyting else is) but I have read other posts that refer to a little pin and all the landrover warnings that it might brake.
I just want to be sure. I am talking about really steep stuff.
The Rock crawl does not lock the centre diff. It only locks as required. I am sure that it could be done with software because the car knows it is in deep sh^&t and beeps like crazy. If the EARTH was flat I would not need my DISCO 3
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| 31st Mar 2008 12:51 pm |
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Slimer
Site Moderator
Member Since: 06 Jan 2005
Location: Last Exit to Nowhere
Posts: 16295
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Surely if you put it in Park and apply the Park Brake it's not going to move unless you're somewhere really slippery  The End
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| 31st Mar 2008 12:59 pm |
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Pelyma
Member Since: 06 Jan 2005
Location: Patching, Sussex
Posts: 15496
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I was told to put the car in N holding on the footbrake, apply epb, foot off foot brake and into park. That way it doesn't put pressure on the pin. DS3 TDV6 HSE - Silver with Alpaca (old one) Gone
DS3 TDV6 HSE- Silver with Alpaca (new one) Gone
D4 HSE Lux - Montalcino Red Gone
Porsche Cayenne V8 Diesel S
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| 31st Mar 2008 2:55 pm |
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caverD3
Member Since: 03 Jul 2006
Location: Oberon, NSW
Posts: 6922
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I was about to say that.  “There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely gamesâ€
Ernest Hemmingway
D4 3.0 Active Diff, Adaptive Lights, High Beam Assist, Surround Cameras, Privacy Glass.
D3 2.7:Adaptive Headlights,Electronic Rear Diff,ARB Bar,Blaupunkt Speakers,JVC Powered Subwoofer,Removable Snorkel,Mitch Hitch,Pioneer After Market Head Unit,Steering Wheel Control Adaptor,Remote Adjustable Supension Rod System, Taxside Dual Battery System.
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| 31st Mar 2008 3:39 pm |
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simonsi
Member Since: 14 Oct 2007
Location: Auckland
Posts: 1264
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Pelyma wrote:I was told to put the car in N holding on the footbrake, apply epb, foot off foot brake and into park. That way it doesn't put pressure on the pin.
But surely in his scenario, if the rear wheels with parking brake applied won't hold her she'll slip down the slope until the front wheel movement comes up against....the park pin??? You'd only end up with no load on the pin if she doesn't move in N - which he said wasn't the case (if I understand right ) Cheers
Simon
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| 31st Mar 2008 4:24 pm |
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fakesnake
Member Since: 30 Mar 2006
Location: Leicestershire
Posts: 281
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So what do you do if you have a manual?????
(slide gently down the slope I guess)  Richard
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| 31st Mar 2008 4:32 pm |
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simonsi
Member Since: 14 Oct 2007
Location: Auckland
Posts: 1264
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fakesnake wrote:So what do you do if you have a manual?????
(slide gently down the slope I guess)
Well the park pin on an auto provides what can't be provided by engine braking on a manual...not sure which is more difficult, breaking the park pin or pushing a diesel over compression though.
Efficiency of both will be improved by using low range though. Cheers
Simon
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| 31st Mar 2008 4:36 pm |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50967
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You can have as many brakes as you want but if you're on a poor surface and then combine that with gravity...things can get nasty 
We had a vehicle stuck on the Baskerville course recently.... it was fully braked but started moving sideways under it's own steam on slippery mud ...not pleasant when your only left with a 12inches before the drop. Only the skills of the winch team saved the day
My recommendation would be to walk the whole route first and only consider safe stopping points if you have identified them beforehand... 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 31st Mar 2008 4:41 pm |
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norto
Member Since: 10 Apr 2006
Location: batemans bay
Posts: 1605
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I know all about the logic.....I thought common sense would prevail  Pete
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| 31st Mar 2008 9:00 pm |
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Muzza
Member Since: 24 Sep 2007
Location: Sale
Posts: 10
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OK..SIMONSI seems to understand the problem. Let me try to clear it up.
If I apply the hand brake and leave the auto in neutral the D3 will slide down the hill with the rear wheels skidding and the front wheels rolling. (In a less equipped vehicle like a Nissan Patrol, Jackaroo, Etc, with a transfer case rather than a centre diff, all the wheels are locked by the rear brakes.)
So here we are ready to slide 2.7T of car down the side of the hill if I take my foot off the brake to get out, my only option is to put the transmission into park to stop the front wheels rolling. This stops the car but we have the transmission park brake holding at least half of the 2.7T weight. I am perfectly happy with this as long as I can establish that the mechanism is designed for this type of pressure.
So, if we can establish if the park mechanism is as tough as nails and not a flimsy pin then the problem is gone.
With a manual, the components that would take this load are the same ones that deliver the power so it is OK.
P.S. If I wanted to walk the 30 KM track to check the terrain first i would have taken up bush walking and not 4 wheel driving.
Thanks all for your replies, it is interesting. There have been suggestions on what to do or try but can anyone say what they have actually done in that situation? If the EARTH was flat I would not need my DISCO 3
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| 31st Mar 2008 9:31 pm |
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AndrewS
Tarquin of the Desert
Member Since: 06 May 2005
Location: Y...... because I can
Posts: 10439
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Muzza wrote: but can anyone say what they have actually done in that situation?
Put it into park In the Beginning there was nothing, which exploded.
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| 31st Mar 2008 9:41 pm |
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