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For Trackers (and Sidekicks) of this era (1989 to 1998) the front axle locking device is a locking hub on each front wheel. (There are no actuators until the model change in 1999.) Locking hubs come in two flavors, Manual and auto locking hubs. A look at the from wheel should tell you what you have. Manual hubs have a knob like lever with the word "lock" and "free." Auto hubs say "Auto-Locking" right on them. Both types of hubs require servicing periodicity. (Normally annually.) This means removing and disassembling. Then cleaning and light greasing before reassembling. There are some good videos on the web on how to service the manual hubs. Auto hubs are a little harder to ensure they are working properly, but some people like them. (Not me.)
Please note two things:
1. Due to differential action, BOTH hubs need to be locked for any power to be applied to the front wheels.
2. Trackers of this era are PART TIME 4x4, NOT all wheel drive. They have nothing providing for different wheel speeds front to back like a center differential. This means they should NOT be used on non-slippery surfaces like dry pavement. Beside causing handling and braking issues, it can destroy your transfercase driving on dry pavement in 4x4 due to what is called "driveline wind up".
PLEASE if you do not understand this, look it up... if you still do not understand, ask and do not use the 4x4 until you do.
I assume they are manual locking hubs? Once you engage the hubs and select 4WD you must reverse a few meters and you will hear them click into place, If they don't lock in your hubs may need servicing, They are quite easy to dismantle and re-grease which you can do yourself if you are handy with mechanical buts and pieces.
Your hubs may not be locking. With your hubs in the locked position, raise the front tires off the ground, manually rotate each front tire and see if the axle connected to the tire spins along with the tire. If not your hubs may not be locking the wheel to the axle. Good luck.
Hubs do quit working. Jack both front wheels off of the ground and lock the hubs but leave the transfer case in 2wd. If you spin one wheel the other should spin backwards. If not replace the hubs. If they do spin correctly, you may have a transfer case problem or a front chunk problem.