I am still using an E47 that is about 30 years old. It has needed very little repair. The key to keeping these things alive is to change the oil once or 2X per plowing season. The blue Meyers oil works well and has some alcohol in the oil that picks up the water that will form ice crystals, especially on the screen of the "C" solenoid. Water gets into the system by way of the rust pits in the turn rams. Every time you turn the blade, one ram goes "in" and the wet snow is on the surface of the ram. Some of it melts into the rusty pits and is then pulled into the fluid and pump. Once I put on new turn rams, but due to the salt on the roads, the new ones had rust pits in a few years. The inside of the E47 can be flushed out with mineral spirits. I bought replacement solenoid cartridges to have on hand, but have never used the new ones. I clean the old ones about every 5 years. I did change the pump oil yesterday.
I experienced "pump" failure a few days ago in that it would lift, drop, and turn left, but would not turn right. On pushing the right turn switch, the pump motor would run and push against the pressure relief valve, dimming the truck lights considerably. I thought the C solenoid was froze up, but not this time. I disconnected the hydraulic quick connects from the pump motor and hooked the ram cylinders together. Normally, I can push the blade right or left, but nothing would move, even with the propane torch on the rams. I thought I had a siezed up ram on the right side and began taking the quick connect off so I could use it on one of the older rams. As I loosened the quick connect, the oil began squirting around the threads. I had created pressure on the ram by using a come along between the right side of the blade and the truck frame. Suddenly the cable tension went slack and the blade easily moved to the right. This is the first time in 45 years of plowing that I have had a quick connect fail. It would allow oil to go into the right ram, but not allow oil to go out. Over the years, I have had dozens of quick connects on the many tractors and equipment, and the only failure I had seen was for them to begin leaking oil. This one did not leak, and the compression ball moved as it should. Mystery!! Replaced Q.C. and everything worked fine. If I had not been persistant, I might have gotten into the pump for a rebuild, and still had the problem.
As my son and I have about 30 plowing accounts, we keep a spare E47 and parts and hoses on the shelf. No time to visit the Meyer dealer when it is time to plow!
Good luck with your system. I do not know about the interchange with the newer pump, but I suspect it'll work fine.
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