Diode on hydraulic solenoid WM 40 super

[BBTom]

Does anyone have the instructions to install the diode upgrade on the hydraulic solenoid? 

I blew one of them out and lost the instructions between taking the blown one off and getting a new one.  So, now I need the instructions. ;D

I get tired of buying that $40 switch on the valve body, and it is such a pain to install it with my chubby fingers. Gee whiz it seems as though they only last about 1000 hours or so. ;D

[Slabs]

Hey Tom

I wasn't aware that Miser had incorporated a "diode" option on mills but if it's like the "reverse current" diode that I put on Cant Hook's mill it's across the switch terminals though probably mounted on the solenoid.  The anode of the diode goes to ground and the cathode goes to the "solenoid" terminal of the switch or from the small terminal of the solenoid to ground.  The purpose of the diode is to shunt the "reverse current" flash of energy which occurs when a solenoid coil is de-energised, to ground instead of having it arc across the switch contacts and damage them prematurely.

If this doesn't make sense or you can't find better instructions, PM me and I'll gen you up a schematic or pictoral (or both).

Good luck

[BBTom]

Thank you, Slabs.

It is an upgrade that came out in '04 if I remember right.   Seems the microswitch was getting eat up too often.

I put one on last time I changed the switch, but must have reversed the leads, : no more diode.  :'(

I will give it another try. 

[sparks]

BBTom here is a wiring diagram showing how the diode wire is installed.   Thanks

[BBTom]

Thank you Sparks,  That is exactly what I need. 

You are always "The man with the plan" 8)

[LT40HDD51]

Sparks Rules 8)

Sounds like Slabs has things figgered, too... ;)

[Slabs]

Waaal now there LT

I came up a little short on the actual Miser method as shown in the diagram Sparks posted.  The diode was placed across the coil of the solenoid which is actually more popular than the "coil-to-ground" method I described.  The "Diodes-across-the coil" configuration is much more appropriate for the new two-pump system. I had also forgotten that Miser uses solenoids that has both ends of the coil routed out of the solenoid so one terminal is connected to the "battery" input and the other goes through the switch to ground.  I'll learn to look at the book before I describe it next time.

Y'all have a good-un.