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Hummer Knowledge Base

The Hummer Knowledge Base

Power Steering Pump

After telling people a number of times that there is a pump cartridge available to rebuild the power steering pump, but not having the number, I felt guilty. So here it is. The pump cartridge is the metric version of the pump used in GM trucks. Mine has "metric" cast into the pump body, right by the pulley shaft. They are available remanufactured with a lifetime warranty from Parts America, number 7519606. The rebuilder is "Original Equipment Re-Manufacturer's". I'm sure there are other rebuilders also. The price is $50 exchange and a $10 core charge. This cartridge definitely fits 92, 93 and 94 Hummers. I assume it fits all, but I have no way to verify that.

If you are interested, you should look at the pump you have. On the back side, there are two studs sticking out. If this is the same pump, the stud nuts will be 18 mm. A 11/16" wrench will not fit, but just barely not fit. The outlet fitting that the outlet hose screws into will be 25mm. A 1" wrench will fit on with a little slop. Reservoirs (bodies) differ from year to year, but I don't think the pump cartridge does. It does not matter if you have an additional remote reservoir as in from 94 on.

Replacing the pump cartridge in the reservoir is very easy. Remove the belt pulley with a small puller, remove the two studs on the back and the outlet fitting, push the cartridge out of the reservoir, replace the seals, (new seals come with the remanufactured pump) and put it back together in reverse order. There you go. But I recommend doing it in your garage and not in the Moab Best Western parking lot. :-)


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