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Nortrac NT25 4 wheel drive won't engage; axle and shaft are intact. How to diagnose/repair transfer case?

I have a NorTrac NT25 tractor and the 4 wheel drive won't engage. The front tires (in the air) are operating as expected without grinding, popping or locking but the transfer case never locks in. How do I remove the transfer case to repair, or is there another alternative to pulling the whole transfer case as it looks to be a very large job.

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Posted on Jan 02, 2017

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SOURCE: can not remove axle cover,

Hi, easy fix you have to pry the cover off. you can use a screw driver, or a pry bar.

Posted on Nov 23, 2008

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SOURCE: four wheel won't engage

Theres a vacume dash pot under the battery box. It pulls a cable that engages the front diff. Put the vacume line and you'll have lights and four wheel drive. (it happened to my blazzer)

Posted on Dec 29, 2008

Thunder55
  • 318 Answers

SOURCE: 1991 F150 front axle not locking in.

Front hubs need to be taken off and inspected for damage,
Replace as necessary.

Posted on Jan 19, 2009

  • 1 Answer

SOURCE: 4 wheel drive not working

when you engage it in 4 wheel make sure you are getting vacuum to the acuator just pull the hose off and feel to see if there is vacuum if not check all vacuum hoses

Posted on Jan 25, 2009

  • 11 Answers

SOURCE: john deere 2010 tractor. pto grinds and wont engage

The PTO usually has a clutch that has to be engaged so that you can select the PTO rotation setting. I had a problem like that on my tractor and all it needed was a little adjustment on the PTO clutch lever, so it could disengage the PTO gearbox properly.

Posted on Mar 11, 2009

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I have a nortrac 204 tractor. Water in transmission. I caint find A drain plug for the transmission. Can anyone help me?? Thanks


There has been an ongoing fashion among some manufacturers to delete the transmission (and cooling system) drain plugs to discourage people from changing the oil. It was reckoned the transmission with it's original oil and additives on average would give a longer life than with repeated refills of possibly unapproved oils without special additives. Research has shown more dirt is often introduced putting in new oil than gets drained out.

Draining such a transmission usually means removing an oil pan, various bolts that might not have a blind hole or using suction with a dip tube through the filler/level plug hole.

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Is there an electric or vacuum switch on a 2001 chevy blazer


There are 2 models here the push button will flash if the system is not engaging or disengaging properly . If front drive shaft is turning. That is with car raised and supported . if front drive axles do not turn then the axle actuator is not engaging axle shaft passenger side. Remove actuator and manually engage shifting collar with a screwdriver still does not turn then inner axle is twisted.

Mar 21, 2014 | 2001 Jeep Grand Cherokee

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2003 gmc envoy 4x4 problems. 4200 vortec engine. my front diff doesnt seem to be


The Selectable Four Wheel Drive (S4WD) Front Axle consist of the following components:
• Differential Carrier Housing
• Differential Case Assembly
• Inner Axle Shaft
• Intermediate Shaft Bearing Assembly (located on the right side of the oil pan)
• Electric Motor Actuator
The front axle on Selectable Four Wheel Drive (S4WD) model vehicles uses a disconnect feature mounted on the right side of the oil pan in order to engage and disengage the front axle. When the driver engages the 4WD system, the Transfer Case Control Module sends a signal to the electric motor actuator to energize and extend the plunger inside. The extended plunger moves the clutch fork and clutch fork sleeve across from the clutch fork outer gear that is splined to the right side wheel drive shaft to the clutch fork inner gear that is splined to the inner axle shaft. The locking of the two gears allows the axle to operate in the same manner as a semi-floating rear axle. A propeller shaft connects the transfer case to the front axle. The differential carrier assembly uses a conventional ring and pinion gear set to transmit the driving force of the engine to the wheels. The open differential allows the wheels to turn at different rates of speed while the axle continues to transmit the driving force. This prevents tire scuffing when going around corners and premature wear on internal axle parts. The ring and pinion set and the differential are contained within the carrier. The axle identification number is located on top of the differential carrier assembly or on a label on the bottom of the right half of differential carrier assembly. The wheel drive shafts are completely flexible assemblies consisting of inner and outer constant velocity CV joints protected by thermoplastic boots and connected by a wheel drive shaft.

How To Install Repair Replace 4x4 Front Axle Actuator Chevy Trailblazer...

May 11, 2017 | 2003 GMC Envoy

2 Answers

Got. A 2003 f150 4x4 got problems with 4 wheel drive locking in and stay in drive shaft turning front wheels not


Operationally vacuum shifts the front axle between 2WD and 4WD mode. The GEM ( Generic Electronics Module ) applies ground to the solenoid needed for the mode selected on the switch ( for ESOF ) or when the transfer case shift lever is moved ( MSOF ).The contact plates in the transfer case signal the GEM that the transfer case is engaged, and the Vacuum solenoids need to be activated ( either 2WD to 4WD or 4WD to 2WD ).

Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
- If it turns it is a problem with the transfer case.
- If it doesn't it is a front axle engagement problem ( this is what you seem to have, the transfer case is engaged and will drive the front shaft mine was a key on engine off test ).

- If the front drive shaft does not turn :
•With the truck running ( with front wheel back on the ground ), switch from 2WD to 4WD and back again, the vacuum shift motor should move the lever on the front axle.
sscullys_185.jpg
-- If the vacuum shift motor does not move:
1.Check for vacuum on the lines while shifting between modes. Pink vacuum line is 2WD mode, Light Blue vacuum line is 4WD.
2.Check the fuses for the 4WD system and the solenoids.
3.Check the vacuum lines from the vacuum shift motor to the solenoids on the firewall.
sscullys_187.jpg
4.Check the vacuum lines from the solenoids to the vacuum reservoir box behind the battery.
5.Check the vacuum reservoir box for cracks.
6.Typical solution is the vacuum lines ( to the solenoids or to the vacuum shift motor ) are cracked or the vacuum shift motor has a cracked diaphragm and has water in it.
7.Could be the shift plate contacts in the transfer case are corroded / not making good contact, and not activating the solenoids.
sscullys_186.jpg

Usually the case is cracked vacuum lines from the solenoids, the next common is a cracked vacuum reservoir box, and 1 time I have seen the mount for the vacuum disconnect motor broken ( motor floating free so it could not push against the axle )
sscullys_188.jpg

Aug 28, 2011 | 2003 Ford F150 Regular Cab

2 Answers

4 X 4 does not engage front wheel drive when I move the 4x4 Shifter. Transfer case does shift into low range/high range ok, just no front wheel drive?


older GM's have an electric motor on the transfer case to engage the front wheels. Since it is under the truck they do corrode. Look there first. Easy to fix if so.

May 02, 2011 | 1992 GMC Suburban

1 Answer

Transfer case on 2006 F150 will engage but no power to front wheels?


SOUNDS LIKE A BAD HUB TRY THIS TO DIAGNOSE THE PROBLEM

Put the transmission in park, set the parking brake and raise the chassis so one of the front wheels is off the ground while the other is still on the ground. When the transfer case is in two-wheel drive, the hubs should be released allowing the wheels to turn freely when spun by hand. If the axle shaft turns when you spin the wheel, it means the hub has not disengaged.
To check engagement, rotate the axle shaft backwards. This should lock the hub. Try turning the wheel by hand again. The axle shaft should now turn with the wheel if the hub is locked. If the hub fails to lock, the hub will have to be disassembled and inspected or replaced.
To check release, hold the axle shaft steady and rotate the wheel backwards. You should hear a click as the locking mechanism slides back out and disengages the hub. Rotate the wheel forward again and it should turn freely.
Another way to check the hubs is to raise the vehicle on a frame contact lift so all four wheels are off the ground. Then start the engine and place the transfer case in four-wheel drive and the transmission in drive. If the front wheels don't turn, look at the front axle shafts. If both shafts are turning, but one wheel is not, the problem is a bad hub on the wheel that isn't turning. If the front driveshafts are not turning when the transfer case is in four-wheel drive, the problem is inside the differential (broken side gears) or the transfer case (broken chain, shift linkage, etc.). If the driveshaft between the transfer case and differential is turning, the problem is in the differential. If the driveshaft is not turning, the vehicle is going to need repairs to the transfer case.
Hope this helps.

Dec 28, 2010 | 2006 Ford F-150

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May 19, 2010 | 2000 Jeep Grand Cherokee

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Is it right for your front drive shaft to turn by hand when in park


i'm assuming you have a 4 wheel drive. If that is the case then yes cause when your in two wheel drive mode the front is in neutral

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