Search results

well changed the fluid and it is quieter and thinner but u have no idea what fluid was in there other than it was some kind of ATF. can still hear the pump tho so going to try and sound proof it next I'll report back when I get around to doing it.

Working pressure or circulation pressure? I know on my hydraulic gear pump the amount of pressure is RPM dependent till it reaches the pressure that the relief valve is set to then it bleeds off the extra pressure back to the tank. I'm unsure how power steering regulates pressure

but if you change the fluid or pulley wouldn't it adjust the circulating pressure along with the working pressure?

ya your right that's all I'm doing with fluid is making it thinner to reduce pressure. I wonder if they build them to run way higher than needed at all times so when u use say a winch, outlanders, or whatever they have its not a issue.

tho that would probably help with the noise it would also reduce operating pressure. I'll change the fluid out and see how it does then I'll wrap the pump in sound deadening material and call it good as it looks like it's gonna be a noise pump by design so blocking the noise is the best option.

Well with the picture above it's clear that humvee's don't use a gear pump at all they have the standard civilian style vane pump and the beefy version of a vane pump pictured above but nothing that resembles a gear pump. I'm actually going to be testing that as I had that same thought and I...

Wow thanks for the pics, ya that's not your standard gear pump looks like a vane pump using hydraulic pressure maybe but neat none the less. Ya sound proofing it wouldn't be easy or pretty i'm sure because of the pulley there won't be a lot room to get much on that side of the pump. I'll...

PM sent

ya not sure I would want to go away from the gear pump but gear pumps aren't all that noisy either I have a 40ton and 20ton hydraulic gear pumps on my wood splitters and you can't hear the pumps running and both of the engines make less noise than the diesel. If these pumps are just a bad...

Been sound proofing the humvee and the quieter it gets the more I notice the power steering. I was thinking about rebuilding or replacing the pump even tho there is no foam or air bubbles in the reservoir I'm not sure it's not sucking a small amount of air around a seal that I can't see evidence...