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If you're referring to the 4.0 I-6, there is an idler pulley located directly under the airconditioning compressor pulley.
However, tension is adjusted through the power steering pump. You will have to loosen the two bolts behind the power steering pump, two or three bolts which attach to the power steering bracket, as well as the one under the front of the pulley.
There is also another bolt under the driver's side of the power steering pump. This one actually controls the belt tension
you are incorrect. on a 91 jeep cherokee the belt is adjusted pivoting the power steering pump assembly. loosen the top bolt on the PS bracket, the 2 bolts on the back of it, and the bolt holding the adjustment bolt tight (the long bolt threaded into the bracket under the pump on the drivers side. turn the long bolt (adjustment bolt) to tighten or loosen the bolt.
the power steering pump has a seperate adjuster bolt ont the bottom left of the pump if you loosen this off then loosen the pulley bolt it iwill move in to allow for the belt then tighten the adjuster bolt till the tension on the belt only allows for a 1/2 inch movement up or down then tighten pulley bolt
not the pump may be stiff to move at first
I see this is a two part question... In replacing the alternator, there is no reason at all to be messing with the pulley on the power steering. That pulley is pressed on and though you could remove it with a puller it is far more difficult to re-install without the proper tools. (it is not hammered on). Power steering pulleys don't just fall off. They are so tightly pressed onto the shaft that they don't even require a retaining bolt to hold them on. Without the benefit of being able to examine it myself, I'd have to guess that either you originally had a mis-match of pulley to pulley shaft and the pulley was sliding on the shaft (so remote a concept that you may be hit by a meteorite if you buy that) Or someone removed it for an unknown reason and did not properly re-install it.
If for any reason the pulley is in your way, remove the pump not the pulley. Alternator is on the other side of the engine...why remove it? The pump is the adjustment for the belt. (loosen bolts and use the transverse bolt underneath to adjust tension)
To replace belt, first loosen the pivot and slide bolt on the steering pump, then use the jack bolt below the pump to move it. Belt goes (ccw) around outside of ps pump, under idler pulley, over a/c compressorover alternator over fan pulley, over crank pulley over water pump and back to the ps pump. best bottom (grooved area) should match with any pulley with grooves, back of belt should contact smooth pulleys. 9example...grooved part contacts ps pulley, smooth back goes under idler pulley) When finished the water pump should spin ccw (I've seen them put on incorrectly so it turns backwards) Tighten jack bolt till the long strech of belt is giving about 1" deflection, then lock pivot and slide bolts down.
If you have the same pulley arrangement that most 4.0 engines have that pulley is an idler not a tensioner. Your power steering pump has a pivot bolt, and a slide under the pump. You adjust belt tension using the pump.
James, I believe the pulley is just bolted to the pump shaft, so u should be able to remove it and reuse it. The play in it is in the shaft of the water pump, so the pulley should be fine, just remove and bolt to the new pump.