The hydro assist install is finished at least until real world testing proves me wrong. After getting the larger reservoir bolted to the engine and all plumbed next came the hydraulic cylinder from West Texas Off-road home of the Redneck Ram.
Their ram and hose kit isn’t the cheapest way to go but their ram is made in house and they carry all repair/rebuild parts.
After measuring numerous times and reading some old threads here on Mud I decided to purchase a 10” ram. It does use up 100% of the available space on the tie rod and maximizes turning radius. In fact, the 10” ram pushed the steering angle a little farther than my current steering stops adjustment would allow even though I measured a full 5” of tie rod travel each direction prior to making the order.
I split the difference by placing three 5/8” washers on the chrome piston as an external limiter to 9.75” total stroke and adjusted the steering stops on the knuckles to match. The steering box pitman arm makes a large arc and has no problem “out stroking” the 10” ram.
The steering box was rebuilt at Redhead and upgraded with the 105 sector shaft as well ported for hydro assist. They put a Made in USA sticker on the gear box which cracked me up but I left it be.
A note about hoses; WTOR makes very HD hoses with a working pressure of 4750 psi and choosing length is up to your choice of routing. The 90* fitting that they crimp onto one end of the hoses has a short radius. When attached to the forward port of the steering gear the short radius won’t reach completely around and past the front of the steering box. It would probably work because the crimped portion of the fitting doesn’t contact the the gear box until it’s threaded on most of the way but I didn’t like it. Add to this the fact that I ordered one hose 37” and the other 43” but receive two hoses 43” plus. I went to a local shop and had two hoses made using power steering hose which has a lower burst rating but our pumps are good for only 1500psi anyway. The 90* fittings in the new hoses are larger and have no problem clearing the front of the steering box.
I’d like to thank
@Broski for some tips as I went through this install. The shiny square “U” bolt that I used and bolted to the frame as a hose guide is basically a copy of what he did. I routed the hose from the top fitting (pressure for right turns) across the top of the steering gear box rearward and then down forward it the engine mount. The hose from the forward port is routed toward the passenger side and then makes an immediate turn aft running parallel to the frame and then joins the other hose down through the guide.
A couple other things to keep in mind are to measure for hoses with the frame supported and the front axle completely dropped. Also, the fitting on the ram that is directly below the oil pan can punch a hole in the oil pan if both front springs are compress far enough simultaneously and the bump stops don’t stop axle up travel first. For this reason I bought a 90 that threads into the ram rather than attaching a 90 to the straight union that WTOR sends installed in the ram. This gained me an inch more distance between the fitting and the oil pan.
I’ve only taken it for a short test drive. My initial impression is that pump modifications to encourage more GPM flow are not necessary. At idle when turning with the vehicle stationary the steering rate may be a bit slow but at least it’s possible where as before turning with vehicle stopped was a struggle at best. Once rpm is up over idle and I notice no appreciable difference in steering speed but an obvious improvement in power assist. I drove it down the country road and yanked on the steering wheel like as if to dodge something in the road and this was not problem although feedback from the road pretty much nonexistent. The wheels will try to return to center with no input at the steering wheel but not completely
My major concern was how my brake hydro booster would play with this new hydraulic cylinder but, there again, I notice no appreciable difference in the small amount of pavement testing I’ve done.
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