One of our member’s sent me this troubleshooting story:

“The company I worked for had invested in a complete overhaul of the engine on an older Mack truck, sleeper version in otherwise poor cosmetic shape. In addition, they were the proud owner of a mechanically poor, cosmetically good Mack in a non-sleeper configuration. The decision was made to do a … Read more

Back in 1991, the hydraulics company I was working for had supplied conversion kits to change the hydraulic piston pump on an ROV (remotely operated [submersible] vehicle) from an obsolete brand to Linde.

The kits had been supplied as an in-field replacement, so that the changeover could be done when necessary. In other words, when the existing hydraulic pump failed. … Read more

In the case of AC electric coils, the resistance or impedance of the coil is lowest when the solenoid is open, i.e. when the plunger is out. Impedance increases as the plunger is pulled into the closed position. As a result, the current draw of an AC solenoid is highest when the solenoid is open (plunger out) and lowest when … Read more