Towing a auto Prado 90

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george
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Sat Feb 13, 2016 8:22 am

I am new to automatic gearboxes. I always taught you can not tow a auto with a normal rope.
My understanding was that you need to disconnect the prop shafts or put on a lowbed truck.

I read in the manual that you put the box in neutral and then you can tow the vehicle.
They do mention that you can only do it for short distances.

So my question is.Lets say I am 200km away and someone can tow me back. Can I tow the prado for 200-300km with the box in neutral or do I have to disconnect the propshaft.
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Knuppel
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Sat Feb 13, 2016 8:36 am

Geoge, 20 km is ok but 200 km is a big no! You will need to remove the props.
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george
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Sat Feb 13, 2016 8:50 am

Knuppel wrote:Geoge, 20 km is ok but 200 km is a big no! You will need to remove the props.
Shot :thumbup:

Just for interest sake. What will go wrong. Is it to do with box not getting lubrication or what do you damage
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Dowe Koos
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Sat Feb 13, 2016 9:54 am

Hallo George, kyk wat Wikipedia sê
https://en.wikipedia.org/wiki/Automatic_transmission" onclick="window.open(this.href);return false;
Neutral / No gear (N)
This disengages all gear trains within the transmission, effectively disconnecting the transmission from the driven wheels, allowing the vehicle to coast freely under its own weight and gain momentum without the motive force from the engine. Coasting in idle down long grades (where law permits) should be avoided, though, as the transmission's lubrication pump is driven by non-idle engine RPMs. Similarly, emergency towing with an automatic transmission in neutral should be a last resort. Manufacturers understand emergency situations and list limitations of towing a vehicle in neutral (usually not to exceed 55 mph and 50 miles). This is the only other selection in which the vehicle's engine may be started.
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Sat Feb 13, 2016 2:55 pm

Put the transfer box in neutral. Tow an automatic will cause damage because the torque converter must turn to lubricate the box so you can tow it if the engine is running .

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Knuppel
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Sat Feb 13, 2016 3:43 pm

I am speaking under correction here but as far as i know that transfer box also has an oil pump in and by putting the t/box in neutral then it also stops that pump from turning and after a while the high bearings and gears seize!

Rather remove the propshafts unless you are sure
If you would like to check then use toyodiy or pm me your vin number and i will tell you for sure.

The manual mentions the prop removal for a specific reason. ;-)
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Sat Feb 13, 2016 8:49 pm

My auto V6 broke a fanbelt which really damaged an already leaking front crank seal.

This happened in Atlantis on the dunes.

Luckily I had Francois from 4xLux there with me. We put on a new belt that Allan (Hoppy) brought to us.

Only when we got the petrol station to pump the tyres did we see how much oil I was loosing due to the damaged seal. Francois then said that we needed to tow the vehicle to avoid any damage to the motor.

We then put the transfer box in neutral and kept the normal box in park. I then let the motor idle as we were towed home to Brackenfell.

According to Francois it is a safe way to tow an auto vehicle and said that Allan confirmed it as well.

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Knuppel
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Sat Feb 13, 2016 9:09 pm

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Sun Feb 14, 2016 8:51 am

George, don't break your head about it. My Prado is hitting 400 000 and apart from towing other vehicles, that is the closest it has come to any kind of towing.
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Sun Feb 14, 2016 9:35 am

The oilpump in the transfer case will still work if towing gets turned by the propshafts.

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Knuppel
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Sun Feb 14, 2016 11:19 am

I just love the crap they write in the owners manual :bye:
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Knuppel
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Sun Feb 14, 2016 12:04 pm

Before i finaly shut my trap on this matter and for the innocent, the transfercase on a cruiser has an oil pump. The oil pump is driven by an idler gear that sits between the high & low range selector. If you select neutral the pump is not driven. The major components in the bottom of the box wil get lubricated but the idler gears running on the high and low range shaft have the possibility of running dry. Or thats how i have it the last time i checked.
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Sun Feb 14, 2016 3:21 pm

Ok lets see when you drive the vehicle the oilpump in the transferbox is driven by the output shaft from the gearbox . Now if you select neutral the drive from the gearbox is gone. If the vehicle starts moving drive to the internals from the transferbox is from the propshafts and that will turn the transferbox oil pump gear witch will supply oil pressure and lubricate the needed parts

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Knuppel
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Sun Feb 14, 2016 4:00 pm

Two gearboxes,
One, the automatic gearbox, that needs drive from the engine to keep the oil pumping in the gearbox and cannot be kept alive from the propshaft end.
Two, the transfer box, the oil pump needs to be driven from either the engine side or the prop shaft side. Puting the auto box in neutral stops drive from the engine side and then if the vehicle still moves the prop side propvides drive for the oil pump, unless you put the transfer box in neutral, then there is no drive for the oil pump in the transfer.
If you can keep the engine running on an auto then you can put autobox in neutral, leave the transfer in high range and tow as far as you wish.
If not then lift it on a roll back or remove the prop connections to the diff/s . Not necessary to remove complete prop, just remove diff side and hang it up on a rope or wire ensuring it does not slip out on the splines. On a part time 4x4 only need to remove rear prop. On full time 4x4 disconnect both props.
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pietpetoors
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Sun Feb 14, 2016 9:03 pm

I agree with Jan on this one.
If they could tow 4x4Bees' Hilux with the main box in Park and the short kiere in neutral it means your main box is completely out of the picture when the short kiere is in neutral.

If the transfer case pump is driven by the main output shaft it will work as long as the prop shafts are turning, whether it is from internal or external.

If one is not sure the safest is always to remove the propshafts, rather safe than sorry.
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Knuppel
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Mon Feb 15, 2016 8:43 am

:silent:
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george
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Mon Feb 15, 2016 8:48 am

Ek sal liewers propshaft losmaak as ek ooit n tow sou benodig
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