my friends max IV has no power

[Jacob 6x6]

I live in FL and a friend and i were out at a mud hole today and his max has no power its very sluggish no lowend at all tires wont even turn in mud or go up hills what should he do? I have a 1996 argo bigfoot and it walks the dog on it but i changed my belt and shortened my gov spring we did the same with his gov spring but never changed the belt. or could it be in his clutch

[Mike]

Check for proper tension on his belt and shim the motor up if it needs to be tightened. If it's his motor that is lacking power under load then perhaps start by looking at the carburetor and seeing if there is any trash in it. Also, this may seem obvious but make sure he is pushing forward hard on his laterals when going up hills or in any terrain that has more than usual resistance.

[Jacob 6x6]

The motor runs good in nutral revs some high rpms just under a load it falls on its a##
I guess we will try and shim the motor and see what happens thank you for the reply

[jpswift1]

Also check your clutches, both drive and driven. If the rollers, sliders, or other components are worn the symptoms you described will certainly happen. Good luck with it.