This is something I've done before. The first time I rebuilt it with new seals/o-rings. This time I decided to go ahead and replace it. I was having problems with the power assist cutting out. First it was kind of random, sometimes at low RPMs (typical symptom), but other times it was at nominal RPMs (not so typical).
So this is not a hard project, but I thought I would contribute a quick DIY thread with some quick photos of the process.
Remove any skid plate you have under the engine bay and from below find the idler pulley on the spring loaded pivot (almost center of the engine block). With a 14mm socket and drive handle rotate the idler pulley CCW and use a small 3-4mm pin to hold the pulley in the "open" position. Remove the serp belt from the PS pump pulley. No need to pull the belt completely from the engine bay. Just tuck the PS pump loop down out of the way, while leaving the rest of the belt where it is.
Pic#1 Ignore the wrench for a moment and concentrate on the hose and spring clamp to the left. A pair of needle nose pliers held alongside the hose work best for squeezing the clamp and sliding this hose off. Be prepared with an oil pan and possibly even a towel under the truck. I tried to use a hose clamp on this to prevent the drainage of PS fluid from the reservoir, but it didn't work. Probably best that I flushed the reservoir anyway.
Pic #2 Using a 14mm wrench, remove this "banjo" fitting on top of the pump and place this out of the way. I was able to hang this slightly behind the pump allowing it to drip into my oil pan. If you let it hang down to the ground, you will drain most of the PS fluid from your steering rack, so try to avoid that.
Pic #3 Now remove sensor wire from the top of the pump by squeezing the clip and gently lifting directly upward. Remove the wiring harness from the bracket. I squeezed the square black retainer clip and flicked it off the metal bracket with a screw driver. **The easier method would be to leave the plastic retainer alone and remove the 10mm bolt from the backside of the pump (ie, leave the retainer attached to the metal bracket). And also remove the ground wire, also a 10mm bolt.
Pic #4 Remove the upper mounting bolt using 14mm deep socket inserted through the access holes in the pulley. It's a long bolt but only about 12-13 threads hold it in place.
Pic #5 Remove the lower mounting bolt the same way as above. This is a much shorter bolt, but also has about 12 threads holding it.
So this is not a hard project, but I thought I would contribute a quick DIY thread with some quick photos of the process.
Remove any skid plate you have under the engine bay and from below find the idler pulley on the spring loaded pivot (almost center of the engine block). With a 14mm socket and drive handle rotate the idler pulley CCW and use a small 3-4mm pin to hold the pulley in the "open" position. Remove the serp belt from the PS pump pulley. No need to pull the belt completely from the engine bay. Just tuck the PS pump loop down out of the way, while leaving the rest of the belt where it is.
Pic#1 Ignore the wrench for a moment and concentrate on the hose and spring clamp to the left. A pair of needle nose pliers held alongside the hose work best for squeezing the clamp and sliding this hose off. Be prepared with an oil pan and possibly even a towel under the truck. I tried to use a hose clamp on this to prevent the drainage of PS fluid from the reservoir, but it didn't work. Probably best that I flushed the reservoir anyway.
Pic #2 Using a 14mm wrench, remove this "banjo" fitting on top of the pump and place this out of the way. I was able to hang this slightly behind the pump allowing it to drip into my oil pan. If you let it hang down to the ground, you will drain most of the PS fluid from your steering rack, so try to avoid that.
Pic #3 Now remove sensor wire from the top of the pump by squeezing the clip and gently lifting directly upward. Remove the wiring harness from the bracket. I squeezed the square black retainer clip and flicked it off the metal bracket with a screw driver. **The easier method would be to leave the plastic retainer alone and remove the 10mm bolt from the backside of the pump (ie, leave the retainer attached to the metal bracket). And also remove the ground wire, also a 10mm bolt.
Pic #4 Remove the upper mounting bolt using 14mm deep socket inserted through the access holes in the pulley. It's a long bolt but only about 12-13 threads hold it in place.
Pic #5 Remove the lower mounting bolt the same way as above. This is a much shorter bolt, but also has about 12 threads holding it.
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