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3E-7859 Starter Solenoid Switch for Caterpillar CAT Heavy Equipment
Product Overview
This 3E-7859 starter solenoid switch is a widely used starting relay for Caterpillar heavy-duty machines and diesel engines. Mounted on the starter motor, it receives low-current start signals from the ignition key or ECM, closes heavy-duty internal contacts to deliver power to the starter, and engages the starter pinion with the engine flywheel ring gear. Our replacement starter solenoid assembly matches the electrical and mounting specifications for reliable equipment starting repair.
Key Specifications
| Item | Details |
|---|---|
| OEM Number | 3E-7859 (3E7859) |
| Part Type | SOLENOID AS-STARTER |
| Operating Voltage | 24V DC |
| Compatible Starter | Delco 37MT series heavy-duty direct drive starter |
| Cross Reference Part Numbers | 9X-0301, Delco 1115619, 1115621, D915A |
| Condition | New Aftermarket |
| MOQ | contact us |
Compatible Models & Engines
- Core Diesel Engines: CAT 3116, 3126, 3126B, C7 electronically controlled and mechanical fuel injection engines
- Excavators: 320B, 322B, 322C, 325B, 325C, wheel excavator M318
- Motor Graders: 120H, 135H
- Wheel Loaders: 938F, 938G, 950F, 950G, 960F, 962G, tool carriers IT28G, IT38G, IT62G
- Crawler Loaders: D5M, D6M, 953B, 953C, 963C
- Cross-brand Application: Bell 670CH motor grader equipped with CAT or John Deere engines
FAQs
Q: What function does this 3E-7859 starter solenoid perform?
A: It acts as a heavy-duty relay for the starter motor. It takes a small electric signal and switches high current power to the starter, while mechanically pushing the starter gear to mesh with the engine flywheel to crank the engine.
Q: What symptoms mean this starter solenoid has failed?
A: Common signs include no cranking sound when turning the key, only a single click at the starter, intermittent starting failure, or the starter spins but fails to engage the engine flywheel.
Q: Can this replace the cross reference part numbers listed?
A: Yes, it works as a replacement for 9X-0301, Delco 1115619, 1115621 and D915A. Please confirm your original part number and starter model before ordering.
Q: Any safety tips for installation?
A: Always disconnect the battery before working on the starting system. Verify terminal wiring strictly following the equipment service manual to avoid short circuit and component burnout.
3E7859-starter-solenoid-switch
Free Inquiry Now
If you have any enquiry about quotation or cooperation, please feel free to email us at info@solenoidvalvecoil.com or use the following enquiry form. Our sales representative will contact you within 24 hours. Thank you for your interest in our products.
