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Old 09-01-2015, 01:55 PM   #1
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Join Date: Dec 2007
Location: Southern California
Posts: 72,178
Default Tech notes. Inside the solenoid

Tech note from Carts Unlimited.
It has come to my attention that a few users of the MZJ200 solenoid are experiencing failure.
This solenoid was extensively tested under the harshest conditions possible with an engineer at the wheel. The solenoid met all requirements and is today recommended for all Alltrax controls 400a and less.

I spoke with the testing engineer today who explained how the installer may cause the solenoid to fail. This is what I want to share with you.
The solenoid has side mount main terminals. these stud terminals are double nutted on the outside of the case. The nut against the case has 2 functions:
1. light tension against the case or housing holds the inside contact in place.
2. when held with 1 wrench a second wrench can be used to tighten the outward nut against the cable terminal without spinning the solenoid stud.

If 2 wrenches are not used when tightening the outer nuts, there is a risk the stud may turn. The slightest turning of the stud will greatly reduce the available contact surface. Reduced contact will cause solenoid failure.

Just like a motor stud, always use 2 wrenches when tightening solenoid nuts on solenoids with side mount studs. Top mount studs have round contacts and are not susceptible to the same problem.

MZJ200 inside.jpg
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