It doesn't take long to learn when and how to use your
truck's 4WD system. Follow these steps and you'll feel confident about
engaging the system the next time you need to get out of a slippery
situation.
For a conventional system, where you can select 2WD or 4WD, the
instructions refer to engaging 4WD. For trucks with permanent 4WD, they
refer to locking the center differential. Time
Required: varies
Here's How:
Refer
to your owner's manual to find out how to engage your truck's 4WD
mechanism.
When driving in snow, mud, or just going off
road, shift into 4WD when you get ready to leave solid ground. If you
have lockable front hubs, lock them for those operations.
For
severe conditions, use low range if available. Before shifting into low
range you must either stop or slow down to at least 3 mph to prevent
grinding gears.
When you return to normal conditions,
shift out of 4WD or unlock the center differential. If the shifter
doesn't want to move from 4WD or the differential lock stays engaged,
don't panic, becaue the problem is normal and is caused by pressure on
the gears.
Try backing in a straight line about 10 feet and try to
move
the shifter again.
If the shifter still won't move, try backing in an "S"
pattern while trying to move the shifter.
If
you have lockable hubs, don't forget to unlock them when you return to
dry pavement.
Tips:
Vehicles with
permanent 4WD are set up for everyday driving, but not necessarily for
maximum traction on slick surfaces. Engaging the differential lock
increases the vehicle's traction capabilities.
Do not
operate a locked 4WD on dry, hard surfaces. Doing that could cause
damage to the driveshafts, differentials or transfer case.
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Regarding the hard-to-turn feeling with a H3 Hummer. I had the same problem with one of my Hummers. The remedy was quick and simple, but the actual fix was more involved. The remedy was to push the 2x4 button (take it out out of 4 wheel drive). The 4x4 button is very easy to touch and engage when reaching the right side of the dash (for any reason). If the engage light is burned out, there is no way to know that the vehicle is in high range 4x4, except while turning right or left, or when you notice that the 2 x4 light is not lit. The fix is to replace the switch, which is somewhat costly and labor intensive.
www.elcovaforums.com > ... > General H3 Discussion
Sep 15, 2005 - 24 posts - ‎17 authors
rattling sound inespected in my hummer because ... go uphill or press on the gas pedal to ... same time up to 2500 rpm on my H3. .... Buzz or Rattle Noise While DrivingUnder Load from the Exhaust ... 2006 Hummer H3
Check the relays in the fuse box. It appears that the solenoids for locking the doors are working correctly. However it appears that the lock solenoid is not working properly.
That's the tire pressure monitor system that tells you if a tire has low pressure. Since you have different wheels, there may be nothing really wrong. But check all your tires' pressures. One or more may be low. If they are okay, and light won't go off, you may want a mechanic or the dealership to investigate further.
It doesn't take long to learn when and how to use your
truck's 4WD system. Follow these steps and you'll feel confident about
engaging the system the next time you need to get out of a slippery
situation.
For a conventional system, where you can select 2WD or 4WD, the
instructions refer to engaging 4WD. For trucks with permanent 4WD, they
refer to locking the center differential. Time
Required: varies
Here's How:
Refer
to your owner's manual to find out how to engage your truck's 4WD
mechanism.
When driving in snow, mud, or just going off
road, shift into 4WD when you get ready to leave solid ground. If you
have lockable front hubs, lock them for those operations.
For
severe conditions, use low range if available. Before shifting into low
range you must either stop or slow down to at least 3 mph to prevent
grinding gears.
When you return to normal conditions,
shift out of 4WD or unlock the center differential. If the shifter
doesn't want to move from 4WD or the differential lock stays engaged,
don't panic, becaue the problem is normal and is caused by pressure on
the gears.
Try backing in a straight line about 10 feet and try to
move
the shifter again.
If the shifter still won't move, try backing in an "S"
pattern while trying to move the shifter.
If
you have lockable hubs, don't forget to unlock them when you return to
dry pavement.
Tips:
Vehicles with
permanent 4WD are set up for everyday driving, but not necessarily for
maximum traction on slick surfaces. Engaging the differential lock
increases the vehicle's traction capabilities.
Do not
operate a locked 4WD on dry, hard surfaces. Doing that could cause
damage to the driveshafts, differentials or transfer case.
Hummers are 4WD all the time, you can never take it out of 4WD. Now, you can select between locked 4WD HIGH and locked 4WD LOW. Those are switched by putting the vehicle in Neutral, and pushing the button the dash, waiting till the correct indicator light illuminates and then putting the truck in drive. Based on the above info, what exactly kind of 4WD drive problem are you having?
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