HV4902 vs HV5902 and Connector Type

TonyM

Member
Can someone please advise on if the HV4902 or HV5902 is better to add power to my HD Industrial 1841 steering, which uses a (IHC) Ross Hydrapower Steering Gear?
I believe the steering valve is a normally 'open' valve, and there is no Power Beyond port, just pressure and return ports.

Also are the adaptor elbows that comes with the HV5902 a female NPT to 3/4-16 ORB?
From the picture the female end looks like female JIC, which makes more sense than NPT. The HV4902 ports are 3/8" NPT, no elbow provided. It seems like either the HV4902 or HV5902 would work. Tech Support couldn't tell me for certain.


Just for explanation, the Ross steering gear has 3 parts, a steering wheel pump, a valve body, and a cyl attached to the steering gear.
Turning effort applied to the steering wheel overcomes the valve centering spring and hydraulic reaction which moves the valve spool, restricting the return port. This increases the flow to one of the cylinder ports, actuating one end of the piston giving hydraulic power to the linkage where the cylinder is attached.
 
The only difference is that the 5902 has a power beyond port and the 4902 doesn't. If you're only going to use it for the steering I would go with the 4902.

An 1841 should have had power steering from the factory, so why not use the original power steering pump for the replacement power steering setup?
 
One of the previous owners removed the PS pump, and it is long gone. The original PS system had a wire system that pulled on controls that operated the hyd valves to control the hyd cylinder. I've read that system was trouble prone. So I can't really install a factory rebuilt PS pump, as the wire system is missing also. Also a PS pump system is very pricey to build from scratch.
 
(quoted from post at 22:06:40 02/10/16) The only difference is that the 5902 has a power beyond port and the 4902 doesn't. If you're only going to use it for the steering I would go with the 4902.

After some thought, 4902 seems to be the way to go for this situation. I need to get hyd cables made, and will have a 90 degree swivel 3/8 NPT put on the end. This way I don't have to worry about tightening the elbow, and end up with it pointing in the wrong direction. The ORB elbows on the 5902 are a good idea, but I would't use them, again, cause I can have cables made with those ends attached.
 

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