Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Bench Testing: Rotor
Connect ohmmeter leads to each of the rotor slip rings. If continuity is present, rotor is okay. If continuity is NOT present, replace rotor. Connect an ohmmeter lead to any rotor slip ring. Connect other lead to rotor core. If continuity exists, replace rotor assembly. Ensure slip ring diameter exceeds minimum specification. See SLIP RING MINIMUM DIAMETER table.
| Application | In. (mm) | |
|---|---|---|
| Hitachi | ||
| LR180-725 (G20) | 1.024 (26.0) | |
| LR190-714 (M30) | 1.205 (30.6) | |
| LR1110-702 (Q45) | 1.205 (30.6) | |
| Mitsubishi | ||
| A2T13894 (G20) | .870 (22.1) | |
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.