Stuck in 4WD

[Pika1971]

Had to use low range to pull a v heavy trailer up a steep windy hill recently and now I cannot get it out of 4WD.
Tried reversing backwards pushing the button and nothing, the button has been off for about 2 days now and still stuck in 4WD.
Its a nightmare on tarmac at the moment and really need to get it working before I break something.

Any ideas would be appreciated guys...

Cheers

[cataclysm]

Sounds like the Auto-disconnect front hubs are stuck on. I think that vacuum line damage would cause them to jam off (disconnected), but check with other forum members.
Make sure your diff fluid levels are good and there's no crud around the front diff.

If the disconnects are jammed, you might be able to shock them loose without dismantling the diff.
Be careful when you do this, otherwise you'll end up in hospital or dead:

Wedge up the rear wheels *really well*
Handbrake on tight.
Put transmission in N, put transfer box in N (both gear sticks)
Jack up the front of the truck on axel stands
Give the two sides of the front diff a damn good thump with a rubber mallet or small lump hammer where the drive to the wheels comes out; do this while turning the wheels forward and backward.

[Pika1971]

Thanks Cat,

Intrigued as to why this can cause one harm?

Cheers

[nero279]

Lo range and hard surfaces don't mix well on 2nd gen surfs, in low range 4wd is automatically engaged and as there is no centre diff, the transmission will wind up unless one or more wheels can slip to compensate for the different distances travelled by each wheel. In a straight line it would be fine, but as you say a windy hill i'm guessing this wasn't the case.

You also suggest you've been driving it around on tarmac since then still in 4wd, this won't have done you any favours. I don't know the ins and outs of it but you will be suffering from wind-up, someone will be along to advise on what damage may have been done and what's likely to need repairing or replacing to put it right.

[cataclysm]

Wind-up will probably just wear-out your tyres, but it can break drive shafts, diff teeth etc.
One thing it might do is distort the teeth on the auto-disconnect hubs.

>>> Intrigued as to why this can cause one harm?
You'll have to whack it pretty damn hard, and I've know of people dropping cars on themselfs before. Broken ribs, arms, crushed head... fun!

[Vagrant No2]

Jack up one of the front wheels to release the wind up , if any ,and then try to disengage 4wd .Go backwards and forwards as well , after letting the vehicle off the jack.

[jax]

Hi, this happened to my truck a while ago. The 4wd button was out for days and the green 'wheel' lights were still on, on the dash and it was definately still in 4wd. Many ££££s later it was discovered that the electrical wire that goes over the diff that works the sleeve thingy had broken - sorry this is not all that technical. Once the wire was fixed everything was working fine again. Although my truck is a 3rd gen, I hope this might help you.

.......................
Jacqueline

[KERRSURF]

Wind-up will probably just wear-out your tyres, but it can break drive shafts, diff teeth etc.
One thing it might do is distort the teeth on the auto-disconnect hubs.

>>> Intrigued as to why this can cause one harm?
You'll have to whack it pretty damn hard, and I've know of people dropping cars on themselfs before. Broken ribs, arms, crushed head... fun!

use really good secure axle stands and chock back wheels.

[Pika1971]

Thanks guys, I think I may ask Tony to take a look at it as I need a service anyway.

Problem is that I am going to need to use low range again on steep windy roads and I guess the problem will just occur again...

[Gupster]

Dont reall know much about surfs apart from the MK1. But its sounds like you need yo use low range on tarmac quite often. Just like me when towing my boat (18ft, $$$$$$ heavy and always towing it down very very steep windy hills). All i have to do is put the lux in 4WD low but not lock the manual hubs you then have 2WD low range. (With the front driveline turning but not connected to the wheels, so it dosent make a diffrence).

Not sure if you can fit manual hubs to a surf but it sounds like you definatly need them.

You may not have a clue what im going on about....... (I drive a hilux pickup, manual hubs are great)

HTH,

Gupster

[nero279]

You can fit manual hubs to a surf speak to TonyN...

...there was also a little talk at the back end of last year of a wiring plug/sensor you could disconnect somewhere which would stop it engaging 4wd when you selected low ratio, giving you 2wd hi/lo and leaving 4wd on the button for either hi/lo ratio when needed, i assume this would then mean you could pull away in a straight line in 4lo if necessary, then press the button to disengage 4wd on-the-fly once moving and continue in 2wd lo ratio without winding the transmission up.

[sv1000spilot]

This post http://www.hiluxsurf.co.uk/forums/sh...ad.php?t=33270 ?

Although the pics have gone missing, but if 2WD in Lo is what you are after I will repost the pics here.

[nero279]

This post http://www.hiluxsurf.co.uk/forums/sh...ad.php?t=33270 ?

Although the pics have gone missing, but if 2WD in Lo is what you are after I will repost the pics here.

yes please

[chrisinflight]

[QUOTE=cataclysm]Sounds like the Auto-disconnect front hubs are stuck on. I think that vacuum line damage would cause them to jam off (disconnected), but check with other forum members.
Make sure your diff fluid levels are good and there's no crud around the front diff.QUOTE.

Toyota stopped fitting Auto-disconnect hubs in 1989 because they were $$$$. You probably have standard hubs and therefore the ADD (automatic differential disconnect) for the 4wd system. Confusing- yes, but two different systems. I think the problem, like mentioned, is due to a loose vacuum hose or wire within this ADD system.
Have a read of this article:
http://www.4x4wire.com/toyota/tech/add/

Also, fitting manual hubs is a simple job!
cheers,
chris

[Gupster]

If there easy to fit do it, there so much better