The fact that the steering wheel will only turn 180 degrees from
center in either direction with the engine off suggests a steering
componate failure. All modern GM Hydralic/Power Steering Racks and Gear
boxes are hydralic/power Over Mechanical. Which means with no input from
a boost device, they will still operate, in full range, just with Much
greater effort. It does not matter if the vehicle is equiped with
Hydra-boost or not.
Let me simplify this for you. 180 degrees either way from 12 o'clock on
the steering wheel (known as center) would be one turn lock to lock.
Lock to Lock should be atleast 3 to 3&1/2 turns. That indacates a Bind,
broken steering componate not related to the boost device, or a steering
gear box issue.
The pump maybe toast, as well as the belt. Yet installing a new belt at
this point is akin to changing a bad starter on a seized engine.
Hydra-boost pumps will whine badly if the steering is frozen while the
pump is trying to apply boost. Same as with any GM/Saginaw powersteering
pump if you hold your wheel at lock and increase engine speed above idle.
Not really because when power is off, the further you turn it, the
harder it gets to turn it wwen vehicle is not moving. I have seen
lose/bad belt cause this before because GM varible ratio power steering
take a LOT of boost at low speeds.
This may sound strange but how long has the truck been parked in the same
spot? Maybe the front tires are sunk in the grass and holding them. Just a
thought..............if the steering worked fine when you parked it check
fluid levels maybe the sector shaft seals on the steering box leak and the
fluid is low.
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