Power steering pully - shaft has sheered clean?

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Power steering pully - shaft has sheered clean?

Postby subsailor592 [OP] » January 27th 2010, 4:41pm

Just had a water pump replaced on my 99 Astro. The mechanic says while pulling out of the garage, the power steering pully sheered off. He shows me the pully in his hand. Sure enough, the shaft is severed - not bent - just below the pully itself. Good mechanic and a trustworthy guy I'm just trying to figure out how that happens? Anyone ever hear of this? Thanks.
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Re: Power steering pully - shaft has sheered clean?

Postby ihatemybike » January 27th 2010, 4:54pm

New to me. I'd guess a combination of manufacturing defect and fatigue.
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Re: Power steering pully - shaft has sheered clean?

Postby offroad safari » January 28th 2010, 3:42am

it happened to me with my '89 i was driving it and lost power steering, no leaks, had fluid in it, it came out of nowhere, better yet the shaft snapped inside the pump and i drove it home 50 miles, the belt stayed on. it wasnt until i took the belt off that the pulley fell out of the pump
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Re: Power steering pully - shaft has sheered clean?

Postby jeff's93astro » January 28th 2010, 4:55am

same thing here but my was on a 79 chevy pick up
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Re: Power steering pully - shaft has sheered clean?

Postby subsailor592 [OP] » February 4th 2010, 12:00am

Yeah you are right. After my pump came off you could see where the shaft separated inside of the pump. I drive my Astro through the mountains a lot. Sure am glad it happened in the shop and not **** my pants heading for one of those eighteen wheeler runaway truck ramps.
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Re: Power steering pully - shaft has sheered clean?

Postby astro355 » February 4th 2010, 1:30pm

subsailor592 wrote:Yeah you are right. After my pump came off you could see where the shaft separated inside of the pump. I drive my Astro through the mountains a lot. Sure am glad it happened in the shop and not **** my pants heading for one of those eighteen wheeler runaway truck ramps.


Yes, that is exceptional timely. Do didn't notice any funny with the power steering?
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Re: Power steering pully - shaft has sheered clean?

Postby gtkane » February 5th 2010, 4:55am

We see it often enough at the dealer that it doesn't surprise us anymore.
The explanation we got was that the pump is a VERY high presssure unit-capable of 4000psi. Couple that with a real good belt system that doesn't slip...if dirt plugs the passages, something has to give...

Thus the importance of regular maintenance, including a power steering flush.
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