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 Front differential actuator
#1056423
01/30/13 07:41 PM
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Joined: May 2011
Posts: 38
OP
Getting the Wheeling Fever
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How does the front differential actuator work? I'm troubleshooting my 4x4 system, as it makes crunchy noises up front when trying to engage.
The vacuum system is good, I replaced the check valve, and when I tested vacuum to the actuator it did the following:
When vacuum applied to nipple facing rear of truck, rod moved into the differential. When vacuum was removed, rod came out of the differential.
When vacuum applied to nipple facing towards the differential nothing happened.
I'm not sure if my issue is mechanical or electrical. I swapped the solenoids from my parts truck with no change.
I'll go though the wiring diagrams tonight for the electrical portion.
92 Montero SR
84 Maserati Biturbo
89 Mercedes 190E
77 Fiat X1/9
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Re: Front differential actuator
[Re: m4ff3w]
#1056424
02/02/13 06:51 AM
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Joined: Jan 2004
Posts: 918
Rock Warrior
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Do you have auto, manual, or fixed hubs? How about CV joints What kind of shape are they in?
99 Montero....15mpg! Sold (so sad)
02 Jetta TDI....48mpg!
03 2500 Ram QCLB Cummins....18mpg
02 2500 Yukon XL, We out grew the montero, at least it has one locker.....13mpg (sold)
01 montero limited
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Re: Front differential actuator
[Re: m4ff3w]
#1056425
02/02/13 02:01 PM
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Joined: Mar 2005
Posts: 1,006
Body Damage is Cool
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The actuator is engaged/disengaged with vacuum only. The yellow vac hose with vacuum shifts to 2H and the blue vac hose with vacuum shifts to 4H. There is a sequence of operation for the solenoids (A&B). My manual has the test procedure using a vacuum pump, if you want it PM me.
92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles
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Re: Front differential actuator
[Re: motero]
#1056426
02/12/13 09:24 PM
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Joined: May 2011
Posts: 38
OP
Getting the Wheeling Fever
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Do you have auto, manual, or fixed hubs? How about CV joints What kind of shape are they in? They are the stock (auto?) hubs that came on the '92 SR. If I put the truck in the air, 4WD engages and disengages without making the violent crunch noises. I can turn the wheel about 10* before the front drive shaft starts to turn, this is on both sides.
92 Montero SR
84 Maserati Biturbo
89 Mercedes 190E
77 Fiat X1/9
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Re: Front differential actuator
[Re: pcc]
#1056427
02/12/13 09:26 PM
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Joined: May 2011
Posts: 38
OP
Getting the Wheeling Fever
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I see the actuator move, so I've isolated that it isn't my issue. I'm unsure of where to go from here though.
92 Montero SR
84 Maserati Biturbo
89 Mercedes 190E
77 Fiat X1/9
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Re: Front differential actuator
[Re: m4ff3w]
#1056428
02/12/13 11:53 PM
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Joined: Jan 2001
Posts: 13,649
Web Wheeler
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Put all 4 wheels in the air. Shift into 4wdlo. Hand rotate the front driveshaft and feel the front hubs lock up and feel for graunchy stuff as they do. You may have a bad hub lock. Also possible you have a bad front diff, badd cv joint, bad bearings, or bad transfer case, and hand rotation may reveal such.
Last edited by fasteddy; 02/12/13 11:58 PM.
Not responsible for advice not taken...
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Re: Front differential actuator
[Re: fasteddy]
#1056429
02/12/13 11:55 PM
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Joined: Jan 2000
Posts: 16,227
Web Wheeler
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Put all 4 wheels in the air. Shift into 4wdlo. Hand rotate the front driveshaft and feel the front hubs lock up and feel for graunchy stuff as they do. You may have a bad hub lock. Also possible you have a bad front diff, or bad transfer case, and hand rotation may reveal such. I believe there are no hub locks on the stock gen II. It's all centrally actuated by the CAD (Central Axle Disconnect). <img src="/forums/images/graemlins/kewl.gif" alt="" />
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Re: Front differential actuator
[Re: off-roader]
#1056430
02/13/13 05:37 AM
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Joined: May 2011
Posts: 38
OP
Getting the Wheeling Fever
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I did not get a chance to get it in the air tonight, but I did play with it for a bit.
I can go into 4WD Lo-Loc and 4WD Hi-Loc. But 4WD-Hi is what gives me issues.
To get to 4WD Hi-Loc I have to go into Lo-Loc first though.
92 Montero SR
84 Maserati Biturbo
89 Mercedes 190E
77 Fiat X1/9
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