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97 Explorer 4x4 intermittenly doesn't work

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My 97 Explorer 400 works fine the majority of the time except for when driving through mud and water. Once I get into some water the engine starts to bog and run no faster than 5-10 km/h in 4x4. As soon as I hit the 4x4 switch and put it in 2 wheel drive it runs fine. It usually takes approx a half hour before the 4x4 will start to allow the quad to work again and it will work fine up until the quad getting wet again. Any thoughts on what's failing or what to look for?

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here are instructions how to change the hub oil

1.Place a drain pan beneath the hub

2.Remove check/fill plug

3.Turn the hub check/fill plug to the 6 o'clock position and drain the fluid

into the drain pan

4.Turn wheel until front hub fill/check plug is either in the 4 or 8 o'clock postion.

5.Add Polaris Demand Drive Hub Fluid (PN 2871654) until fluid trickles out.

NOTE:Do not force the fluid into the hub under pressure or seal damage

may occur.

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Anything that only works when the machine is in 4wd could be suspect. I would look for ANY loose connections, plugs, or other connectors, bare or damaged wires. Unfortunately tracking these kinds of problems is sometimes time consuming and frustrating. A multimeter will most likely be helpful.

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