drivers for electric over hyd solenoid

Submitted by Jimmy on Thu, 09/19/2019 - 20:42

I have a Cat 247B skid steer and the ECM that controls the Aux Hyd has quit according to the Cat dealer.    They want an arm and two legs for a rebuild one.   From looking at the schematic I was wondering why you can by pass the ECM all together.   There is a rotary thumb wheel that controls how fast the HYDs operator.   Here is a break out of the schematic.   I tried to paste a schematic but this system would not let me.



Try adding the schematic again, you can use the IMCE button or upload the image else where and share the link here.

Normally pasting the image as such on the text box also works 

  Joined August 11, 2018      36
Saturday at 01:52 PM



A Solenoid valve is used wherever fluid flow has to be controlled automatically. They are being used to an increasing degree in the most varied types of plants and equipment. Solenoid valve is a control units which, when electrically energized or de-energized, either shut off or allow fluid flow. The actuator takes the form of an electromagnet. When energized, a magnetic field builds up which pulls a plunger or pivoted armature against the action of a spring. When de-energized, the plunger or pivoted armature is returned to its original position by the spring action. A further distinguishing feature is the number of port connections or the number of flow paths With a direct-acting solenoid valve, the seat seal is attached to the solenoid core. In the de-energized condition, a seat orifice is closed, which opens when the valve is energized.
Three-way solenoid operated valves have three port connections and two valve seats. One valve seal always remains open and the other closed in the de-energized mode. When the coil is energized, the mode reverses. The 3-way solenoid valve shown in Fig. 2 is designed with a plunger type core.

  Joined November 07, 2019      124
Thursday at 04:25 PM