Another Meyer E-47 Plow Pump Rebuild

Another customer that bought a used pump and brought it in for service. He just had the motor replaced at a local electric motor shop. The first thing we noticed is that they did not put any silicone sealant on the heads of the two motor screws. This can allow moisture to get in the motor. We also noticed that somebody had the top cap off the unit at one time, and did not use the Nylite washers under the 3 nuts. This allows moisture into the reservoir.  When we got the pump in the vise, this is what we found. (Not pictured is the missing seal on the top of the lift cylinder. No wonder there was water in the pump.)

Strawberry milk anyone? the pump was filled with automatic transmission fluid, and a lot of water.

Apparently they thought the O Ring they had on hand would work... You can see it is in pieces.

With the lift cylinder removed, you can see it better. Surprisingly it was pretty clean inside.

We had to use a rubber mallet to free up the lift cylinder to remove it. Somehow it was jammed into the Sump Base. Must have had something to do with the wrong O Ring being used.

Never saw this before. Some type of sand in between the angle block and the Sump Base?

This is the bottom of the Lift Cylinder. There were two spots that were peened over interfering with the lift. When the piston was fully retracted (all the way down) it would stick there. Now we know why. We still have no idea why it would be necessary to peen or hit the lift cylinder with a hammer??? There was also quite a bit of rust in the cylinder that we honed off. We hand filed the peened areas to allow proper operation. The customer did not want to replace the lift cylinder.

The top cap was corroded so badly we had a hard time installing the wiper seal. We also found the C Valve expanded (Which is due to hitting an object at high speed with the very end of the moldboard. The fluid cannot flow through the Crossover Relief Valve fast enough, so it shoots up into the valve and expands it.)

The Moral of this story is that if you don't know what you are doing as far as opening up these Meyer Plow Pump units, then take it to someone that does! The other thing is to be very wary when buying a used power unit. I am not sure what this customer paid for the unit, but the motor had to be around $100, plus his bill from us, and had we replaced all the parts we should have (he declined) then he would be at around $500 for repairs.

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