70 Series 4x4 operation (hubs, buttons, switches etc.) (1 Viewer)

[PaulGrant]

Hi there guys,

This may seem like a silly question since one would assume that if you own a 4x4 then you should have all of this under your belt.

I just cannot figure this out since my truck has manual locking hubs.

My truck has manual locking hubs. It also has the 'HUB LOCK' switch. I also have rear (RR) and front (FR) diff lockers.

What I would like to know is:

1. How do I engage H4 (Do I need to manually lock my hubs, press the 'H4' AND the 'HUB LOCK' buttons?)
2. When can I engage RR and FR lockers (must I have my hubs manually locked, the 'H4' and the 'HUB LOCK' buttons pressed?

What are the stages of getting out of the mud, ie.?

1. H4 (What hubs, buttons, switches need to be engaged?)
2. H4 + RR (What hubs, buttons, switches need to be engaged?)
3. H4 + RR + FR (What hubs, buttons, switches need to be engaged?)
4. L4 (What hubs, buttons, switches need to be engaged?)
5. L4 + RR (What hubs, buttons, switches need to be engaged?)
6. L4 + RR + FR (What hubs, buttons, switches need to be engaged?)

Disparaging comments are welcome based on my stupidity!

 

[chappohj47]

Lock the hubs for high4 and press high 4 button. It must of had electric hubs in it befor e
So lock your hubs when you go off road
Press high4 button then drive. If you know it’s going to be a hard mud pit or obstacle lock in rear diff lock. I would only lock the front as last resort

 

[PaulGrant]

Lock the hubs for high4 and press high 4 button. It must of had electric hubs in it befor e
So lock your hubs when you go off road
Press high4 button then drive. If you know it’s going to be a hard mud pit or obstacle lock in rear diff lock. I would only lock the front as last resort

Can I use Rear Lockers without engaging H4?

 

[coldtaco]

Can I use Rear Lockers without engaging H4?

if you don't lock your hubs that would work. there probably is also a work around to allow you to lock the axles without being in 4wheel drive. I know our Tacoma's have a work around and I would think the 80's would have a work around.

 

[JuanJ]

Hello,

Your Cruiser once had electric locking hubs. Along the way some PO swapped them for manual locking ones.

A short guide:

1. Engaging H4: move both hubs to LOCK and depress the HUB LOCK button before pressing the H4 button. A PO may have deleted the electric hubs circuitry after the hub swap, but there is no way to be sure about it without disassembling the instrument panel.
2. Engaging L4: stop the vehicle, depress the clutch and move the transfer lever to L4. Make sure the hubs are in LOCK.
3. Shifting from L4 to H4: stop the vehicle and move the transfer lever to H2. Press the H4/Hub Lock buttons if necessary.
4. Shifting from H4 to L4: stop the vehicle, engage the clutch pedal and move the transfer lever to L4.
5. It is better to use the Differential Lockers with L4. At least that is my experience.
6. Engaging the Rear Locker: make sure the transfer is in L4. Stop the vehicle, push the switch and turn it to RR.
7. Engaging the Front Locker: make sure the transfer is in L4. Stop the vehicle, push the switch and turn it to FR.

Do not exceed 8 km/h (5 mph) when driving with the lockers engaged. Thread carefully: locking differentials can take a lot of abuse but break in a million pieces when not used properly.

Your truck may have a 4WD ECU. This module receives feedback from the Hub Lock switch to operate. That is the reason why you should push the Hub Lock button when using 4WD. And a good excuse to take the instrument panel apart and check the wiring...

Hope this helps.





Juan

 

[JuanJ]

Hello,

One more thing.

You cannot engage the front locker only. Either you use the rear locker or both front and rear.

The rear locker will get you out of most difficult places. However, sometimes front and rear will be your only choice.

Steering is difficult when one or both lockers are engaged.






Juan

 

[PaulGrant]

Hi

Hello,

Your Cruiser once had electric locking hubs. Along the way some PO swapped them for manual locking ones.

A short guide:

1. Engaging H4: move both hubs to LOCK and depress the HUB LOCK button before pressing the H4 button. A PO may have deleted the electric hubs circuitry after the hub swap, but there is no way to be sure about it without disassembling the instrument panel.
2. Engaging L4: stop the vehicle, depress the clutch and move the transfer lever to L4. Make sure the hubs are in LOCK.
3. Shifting from L4 to H4: stop the vehicle and move the transfer lever to H2. Press the H4/Hub Lock buttons if necessary.
4. Shifting from H4 to L4: stop the vehicle, engage the clutch pedal and move the transfer lever to L4.
5. It is better to use the Differential Lockers with L4. At least that is my experience.
6. Engaging the Rear Locker: make sure the transfer is in L4. Stop the vehicle, push the switch and turn it to RR.
7. Engaging the Front Locker: make sure the transfer is in L4. Stop the vehicle, push the switch and turn it to FR.

Do not exceed 8 km/h (5 mph) when driving with the lockers engaged. Thread carefully: locking differentials can take a lot of abuse but break in a million pieces when not used properly.

Your truck may have a 4WD ECU. This module receives feedback from the Hub Lock switch to operate. That is the reason why you should push the Hub Lock button when using 4WD. And a good excuse to take the instrument panel apart and check the wiring...

Hope this helps.





Juan

Hi Juan,

When moving from H2 or H4 to L4 do I have to have the H4 button depressed?

 

[MarkBC]

The rear diff locker on my 4runner stuck on once because of an electrical contact problem. I couldn't get out of it for a few weeks. That was fun driving down the highway at full speed, and taking sharp corners in paved parking lots. It appears that there was no damage done to it. All I had to do was jiggle the connections there on the axle. I was getting ready to pull the whole thing out.

 

[JuanJ]

Hi

Hi Juan,

When moving from H2 or H4 to L4 do I have to have the H4 button depressed?

Hello,

From H2 to L4, just lock the hubs, stop the vehicle and shift to L4.

From H4 to L4, the button is already depressed. Stop the vehicle and shift to L4.

From L4 to H4, make sure the H4 button is depressed.

From L4 to H2, stop the vehicle, shift to H2 and release the H4/Hub Lock buttons. Make sure you set the hubs to FREE.

If the 4WD light does not turn off, drive in reverse a little until the front drive disengages; the light will turn off.

Personally, I prefer to leave the H4 button depressed until I return to the asphalt. I like to stop the truck before shifting the transfer lever and/or engaging the lockers as well. Less wear and tear, but that is just my opinion.

Hope this helps.





Juan

 

[PaulGrant]

Hello,

From H2 to L4, just lock the hubs, stop the vehicle and shift to L4.

From H4 to L4, the button is already depressed. Stop the vehicle and shift to L4.

From L4 to H4, make sure the H4 button is depressed.

From L4 to H2, stop the vehicle, shift to H2 and release the H4/Hub Lock buttons. Make sure you set the hubs to FREE.

If the 4WD light does not turn off, drive in reverse a little until the front drive disengages; the light will turn off.

Personally, I prefer to leave the H4 button depressed until I return to the asphalt. I like to stop the truck before shifting the transfer lever and/or engaging the lockers as well. Less wear and tear, but that is just my opinion.

Hope this helps.





Juan

Hi Juan,

Thanks for all the info, it is really helpful. However I am slightly confused regarding "From H2 to L4, just lock the hubs, stop the vehicle and shift to L4.". Do I also have to press in the H4 Button?
Reason why I ask is because you say "From L4 to H2, stop the vehicle, shift to H2 and release the H4/Hub Lock buttons." implying that H4 Button was depressed when in L4, which makes sense.

 

[JuanJ]

Hello,

My mistake, I forgot to write that. Yes, press the H4 button.

I am glad I can help.





Juan