2014 International ProStar - Heavy Steering and Shuddering

Question

My 2014 ProStar has developed a very heavy steering feel, specifically when I'm backing into a spot or turning at low speeds. It feels like I have no power steering at all for a split second, then it kicks back in. When I turn the wheel while stopped, I get a shuddering through the steering column.

Fluid level is full and doesn't smell burnt. I don't see any leaks around the steering gear box or the pump. The belt is tight and not slipping. Could this be the pump failing internally or is the steering box shot? Truck has 600k miles.

HondaHankk · Accepted Answer

✅ Confirmed fix: The issue was the power steering priority valve located inside the pump housing. It was sticking, causing low flow at low RPMs. Instead of just replacing the valve, I replaced the entire pump assembly and flushed the system. The shuddering and heavy steering at idle are completely gone.

ShopForemanShane · Answer

Check your U-joints on the steering shaft between the cab and the gear box. If they bind up, it feels exactly like the power steering is dropping out. Spray them with some penetrating oil as a test; if the steering gets temporarily better, you found your problem.

2014 International ProStar - Heavy Steering and Shuddering

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