More Common Problems We Find When Rebuilding Meyer E-47 Pumps - 2
Wiper installed upside down. This is VERY common. For some reason it is hard for people to understand that the purpose of the WIPER is to wipe crud off the Lift Ram as it retracts, and well as help keep water out of the unit. It is NOT used as a "seal". So no, your "top seal" is not "leaking" if you see oil coming out here. It is the O Ring under the cap that makes the actual seal.The Wiper looks identical to many common axle seals. The difference is on an axle, its job is to keep oil IN. That is not what it is for in this application, it is to keep water OUT.
Here is both the original design, and current design with brass insert installed correctly. The brass type was actually used in the 1970's and for some reason they stopped using it. Then with the E-58H they started using it again. The brass helps knock off any ice that formed on the Lift Ram as it retracts.
Next we have the Vent. Someone who does not understand tapered pipe threads thought they had to force the bushing in ALL the way. This often cracks the hole in the Top Cap. Tapered pipe threads do not have to be "bottomed out" to seal. Yes, we use liquid thread sealant on the bushing and vent, more as a thread lubricant than to seal.
For some reason it is also hard for people to understand the purpose of the Tooth Washer on the ground bolt. Yes, Tooth Washers are a type of Lock Washer, BUT in this case, the purpose is to have the teeth bite into the Aluminum Sump Base and Tin plated Brass Ground Lug to make a good ground connection. Putting the Tooth Washer between the bolt head and the lug does not help the connection at all. It actually serves no purpose at all. The threads in the Sump Base will begin to form Galvanic Corrosion due to dissimiliar metals (Steel bolt in Aluminum threads) so even though the Tooth Washer is Steel biting into Aluminum, you can just remove the bolt, clean the lug and Sump Base with a piece of sandpaper or Scotchbrite and put the bolt back in. You can't clean the threads in the Sump Base that easily (we chase them with a tap here in the shop to remove the corrosion).
Here is another, not as common but I have seen it a few times. Someone thought they could just remove the Acorn Nut from the Pump Relief Valve and use it as a ground location. As you can see above, there is a washer and O Ring under the Acorn Nut. This is to seal the adjusting screw. You can also see there is not much thread sticking out, so they will loosen the adjusting screw to get more thread to put the ground there. When they loosen the adjusting screw, they lower the pump pressure.
Corrosion in the Top Cap where the Guide Bushing seats. This makes it a tighter fit on the Lift Ram. Clean off the corrosion!
Water in the fluid. This one is VERY common. ANY milky color (regardless of fluid color) is a sign of water in the fluid. The more milky, the more water. As you can see above, this unit was loaded with water. You can also see that by the color, the unit either had Meyer M1(which is yellow and has been since 2001) fluid in it, or more likely, plain hydraulic fluid. I just had a unit in that clearly had MOTOR OIL in it! To clarify, YES, Meyer M1 Fluid has been yellow (almost the same as motor oil) since 2001. There is no "meyers blue". IF the fluid is blue, it is NOT Meyer M1 fluid. Meyer M1 looks more like vegetable oil, but it is thin as water. It is a Naphthenic based fluid. Naphta isa solvent, and yes, the fluid is solvent based unlike the old blue fluid which was paraffin based (like motor oil).
Not very common, but not very uncommon
Swollen C Valves are VERY common. C Valves that are so swollen that the only way to remove them is by unscrewing the C Coil with giant channel lock pliers is less common. You can see where I tried to pry the Coil off. Which leads to a more severe problem...
Hitting SO hard that the bottom ofthe C Valve is snapped off, and still in the bottom of the cavity in the PA Block. If you change a C Valve and it seems like the new one won't screw in all the way, there may be a piece of the old on still in the bottom of the cavity.
Hit so hard that the bottom shattered into pieces. You can see the broken O Ring. the backup was not found in the unit, it must have made it to one of the PA Rams. One note is that when you find damage like this, and the driver tells you they don't know what happened, or they do not recall hitting anything, they might not be truthful. Hits this hard are plain abuse. They are not an "oops" situation, they are beating the hell out of the plow and vehicle, with 99.9% of the time excess speed (they are flying) being involved. The C Valve pictured above happened when the driver hit a stump plowing a $20 driveway he never plowed before, going too fast. He hit so hard, he popped a ball out of the PA Block. He did about $500 worth of damage to the E-47. It needed a new PA Block, C Valve and C Coil. He also destroyed the Spring in the Pilot Check Valve, so he got a new Pilot Check Valve too.
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