Question about 2000 Jeep Grand Cherokee

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How Does Quadra Drive Work?

Does anyone know how Quadra Drive works (in my case a 2000 JCG Ltd)? I know in THEORY how the torque gets transferred etc. But I want to know HOW it knows to transfer the torque, the role of any sensors and solenoids, etc. I have scoured the web and can only seem to find high level overviews.

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  • jss_mailingl Jan 08, 2009

    Thanks, but again, this is high level overview. I am looking for something more from an engineering standpoint.

  • jss_mailingl Jan 10, 2009

    Perfect - thanks! One last question - how does it know the speed difference? Is if the sensors in the transmission or something/somewhere else?

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Under normal driving conditions, the system operates conventionally, and the majority of available torque is applied to the rear wheels. However, when front-to-rear wheel speed variations exist, the progressive differential transfers torque to the axle with the better traction, thus minimizing wheel spin and maximizing control.
The key to this design is a progressive coupling Progressive Coupling , which is supplied with pressurized oil by a gerotor style pump. The pump rotor and case are driven by the front and rear driveshafts respectively, and deliver pressurized oil flow to the coupling in proportion to their speed difference. The progressive coupling contains a multi-disc clutch pack that is alternately splined to the front and rear driveshafts, and controls torque variation between the front and rear driveshafts as dictated by the pump.
A set of orifices and valves control the speed-differential starting point and rate of torque transfer rise in the clutch. This allows the system to disregard the normal speed differences between axles that result from variations in front-to-rear loading and typical cornering.
Transfer case operating ranges are selected with a floor mounted shift lever. The shift lever is connected to the transfer case range lever by an adjustable cable. Range positions are marked on the shifter bezel plate

Posted on Jan 10, 2009

  • brian calhoon
    brian calhoon Jan 10, 2009

    when they slip to much to fast the clutches lock together to give power to the axles with the least amount of traction

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Quadra-trac is a fancy name that simply means full time 4wd. Inside the transfer case is a part called the viscous coupler, this part connects the front shaft and the rear shaft. This unit is sealed and can only be replaced. This unit has a thick honey type oil in it that will give you full time 4wd and will also slip when making turns so you don't get that binding feeling you get in a part time 4wd system.

Posted on Jan 08, 2009

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2 Answers

4 wheel drive is not working


so is AWD,? command trac or what trac?

no working means..... using or 4low,?
my wild guess: 1:
Quadra-Trac-II NV 247 Gerodisc system 1999+
got that? what you have for real MATTERS? we cant guess.
the 247 adds LimSlipDiff option to the system got that too>?
symptoms for working are>......
1: lamp dead.
2: lever stuck
3: tires x4 missing torque to earth?
1999 WJ jeep
4 steering binds up.?

say what is there.
and say what not working means , exactly
and say what tires are touching, (pavement , ICE or dirt)
we cant guess, road, either.

Mar 08, 2015 | 1999 Jeep Grand Cherokee

1 Answer

My 4 wheel drive no longer works.


WJ jeeps.
what mode? 4h, 2l lock >?
why not just drive it and get it all loose and happy first.
get the gearlube hot, see if it wakes up, i bet it does.
there is no vacuum hose. that is part time. used long ago.
vacuum ended in 1995 with command trac.
the newer cars the front axle is cut out, inside the transfer case front end. ending vacuum and now electric.

Select track (stay off dry pavement in 4wd)
Quadra-Trac-II NV 247 Gerodisc system 1999+
Quadra-Drive NV247
if quada stay out of low or lock.

read this page,. and discover what you have.
or go under car, see that transfer case, see that silver and red tag
that is the NV number. what is yours>?
we can not guess options. ever.

http://en.wikipedia.org/wiki/Jeep_four-wheel-drive_systems

which one of 4.
http://www.wjjeeps.com/tcases.htm



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1 Answer

Why wont my jep go into 4 wheel drive when I pull th lever?


which system?
we cant guess what is In YOUR CAR, ever.
you must SAY. or RTM, in the glove box.
and why are you using 4wd on dry pavement, now>?


4WD: Select-Trac (or older Select-Drive has a slip coupling too, NP129/229) is AWD in that, "the "4Hi" setting the drive shafts were coupled together using a viscous-type coupler " this anti wind up slipper"
Watch out for exception 1: Select-Trac NP228 based jeeps, it does not have a viscous-type limited-slip coupling. It was used briefly in 1986.
Quada-Trac is full time 4WD (not in lock mode) has a real center differential to shift torque between front and rear. This is the best system , not just a slip clutch as above. Then went BACK to the slipper in 1980. (odd huh?) Up to 1998.
Quadra-Trac-II "4-All Time", "N" or neutral, and "4-Lo". In "4-All Time", torque is applied to the rear wheels under normal driving conditions.
If the rear axle starts rotating at a significantly higher rate than the front axle, hydraulic pressure builds up in the gerotor oil pump and causes the clutch pack, to progressively transfer torque to the front axle, until both axles return to the same speed
Quadra-Trac I was introduced in 2004-10, same as above but is automatic with no driver controls ,like above.
The Quadra-Drive system was introduced in 1999 and is based on the Quadra-Trac II system but adds limited slip differentials (the best full time system ,with great traction to all wheels all the time) 1999 to 04.
Quadra-Drive-II has electronic limited slip differentials or ELSDs 2005 up.

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1 Answer

2000 jeep GC limited front axle problems


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Oil is added to transfer case through a plug usually located about half way up the back of the case.
When making a diagnosis, a good tech relies upon previous experience matching that to known symptoms, then upon teardown to verify his ideas. A good working knowledge is essential so the tech can picture in his mind what is happening inside the unit.(i once knew an old tech who could sit in the shop office and make a correct diagnosis as another tech drove a vehicle into the shop) That's rare, but there are good people out there! Your coupler may have to be removed, but that largely depends upon what the shop sees and feels.
Good luck

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1 Answer

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sounds to me like the transfer case clutches are worn out. also the fluid could be low or dirty. try draining and refilling the transfercase with clean fluid. if it is still not working after driving it around for a few miles then you may need to replace or overhaul your transfercase

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