It would help a lot if you told us what truck you have , how old and if possible what hydraboost you have. on the bendix units used on medium duty trucks there is an electrric back up pump for the hydraboost. Smaller gm units used an accumulator. When you talk about pump I assume you mean power steering pump which supplies hydraulic pressure to both the steering box and hydraboost when running. From what you describe it is most likely a power steering pump issue.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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