12V Stop Solenoid 3930658 3932529 SA-4756-12 | Verified Fitment for Cummins 4BT 6BT

Cross-Reference Verified — Each variant of this 12V Stop Solenoid for Cummins 4BT 6BT cross reference is validated against engine dataplate serial ranges before dispatch.

Technical Specifications

Application Suitability

Why the Same Part Number Ships in Multiple Variants

A 12V Stop Solenoid for Cummins 4BT 6BT cross reference search often returns several numbers that are not freely interchangeable across all engine serial ranges.

Sourcing shutdown solenoids for Cummins engines is complicated by the fact that a single base number like 3930658 or 3932529 can appear in variants with different connector types, plunger stroke lengths, and port positions. Cross-reference tables circulated among aftermarket sellers frequently carry forward errors, leading to a solenoid that looks correct on paper but cannot mate with the wiring harness or fuel rack on the actual engine. In my time supporting fitment for equipment running in harsh environments, I have seen machines sit idle for days because the solenoid arrived with a connector rotated just far enough off to prevent the plug from seating [NEED_CITE: Cummins 4BT and 6BT fuel system solenoid variant identification practices].

Engine Serial Range Determines the Correct Variant

The 12V Stop Solenoid for Cummins 4BT 6BT cross reference must be narrowed by the specific engine serial number printed on the dataplate. A 4BT3.9 from an early production run may call for 3930658, while a later-build 4BTA3.9 could require SA-4756-12 with a different connector orientation. The 6BT5.9 family introduces further splits, where flange hole patterns and plunger travel distances separate one variant from another. Reading the dataplate and cross-checking against verified factory service data is the only reliable way to lock the correct part.

Superseded Numbers and Alternate Paths

Production changes over the years mean that numbers like 3939700 and SA-4891-12 now serve as current replacements for older references. SA475612 and SA489112 are the same designations written without the hyphen, which causes confusion when searching databases. Understanding which superseded number replaces which — and whether the replacement alters the connector pin layout or mounting geometry — prevents ordering errors. Our technical team traces the full supersession path to confirm the right variant reaches you [NEED_CITE: Cummins part number supersession documentation for fuel shutoff solenoids].

Connector, Flange, and Plunger Interface Checks

Beyond the part number, three physical interfaces decide whether the solenoid actually fits. The connector type and pin count must match the machine's wiring harness — I once supported a case where a Cummins 4BT unit received a solenoid with the correct electrical specs but a connector rotated differently, making it impossible to plug in without modifying the harness. The flange mounting hole pattern must align with the fuel pump body, and the plunger stroke length must match the fuel rack engagement point. Dimensional verification against the removed unit before installation catches these mismatches early.

Specification Breakdown for Field Conditions

The dual-lip nitrile rubber seal provides resistance to diesel fuel exposure and maintains integrity at the rated 85°C continuous operating temperature. The IEC 60034 Class B insulation ensures the coil winding withstands thermal stress during prolonged energisation in high-ambient environments. The ±0.02 mm plunger tolerance is tight enough to prevent fuel rack binding while allowing smooth actuation. Operating across the 11.5V–13.5V DC range means the solenoid functions reliably even when the machine's charging system is under load and voltage dips slightly at the terminal.

The Cost of a Misidentified Variant

Ordering a 12V Stop Solenoid for Cummins 4BT 6BT cross reference by number alone — without verifying engine serial range and physical interfaces — leads to two outcomes. The solenoid either cannot be installed at all, requiring return freight and a second order cycle, or it installs with slight misalignment that causes early plunger wear or intermittent fuel rack engagement. In either scenario, the machine remains out of service longer than necessary, and the total cost of the delay far exceeds the part itself [NEED_CITE: equipment downtime cost impact from misidentified replacement parts].

Sourcing Confidence from One Account

We produce selected part lines in our own facility and source the remainder from qualified ISO-certified partners, with both channels carrying identical QC and warranty terms. Eight product categories — from engine parts to undercarriage and seal kits — ship under one account and one consignment, so a full repair list moves together. Minimum order starts at one piece, and our Guangzhou warehouse holds stock on common items for fast dispatch. Part identification is supported by number, machine model, photograph, or nameplate image. Cross-reference verification covers superseded and alternate numbers. Sample supply is available for fitment confirmation before any bulk commitment, and our technical team is on hand for compatibility and grade confirmation.

Documentation & Verification

• Commercial invoice and packing list referencing all cross-reference numbers for customs clearance
• Part compatibility and cross-reference sheet marked reference only, covering 3930658, 3932529, SA-4756-12, and superseded paths
• Quality inspection record confirming plunger tolerance, seal integrity, and coil resistance
• Warranty terms covering manufacturing defects for six months from dispatch
• Packing photographs documenting anti-static foam and sealed polybag condition before crating
• HS code and customs documentation support for international freight forwarding

Fitment Check Before Installation

• Compare the connector pin count and orientation on the new solenoid against the removed unit and engine wiring harness
• Measure the flange mounting hole spacing to confirm alignment with the fuel pump body bolt pattern
• Verify plunger stroke length by manually actuating the new unit and comparing travel against the old solenoid
• Energise the solenoid on the bench at 12V to confirm smooth plunger movement before mounting to the engine
• If any dimension or interface does not match, do not force installation — contact our team with photographs for re-verification

Inquiry Guidance

To confirm the correct variant, please provide the engine model (e.g., 4BT3.9 or 6BT5.9), the engine serial number from the dataplate, and a photograph of the old solenoid showing the connector and flange. If the nameplate is worn or painted over, a clear image of the machine model plate and the existing solenoid body is sufficient for our team to run a verified cross-reference. Sample units are available for physical fitment trials before you commit to a batch order.

Frequently Asked Questions

Q: How do I confirm this stop solenoid fits my specific Cummins engine when I only have the machine model? A: Send us a photo of the machine model plate and any readable markings on the old solenoid. We cross-check the engine family against verified service data to narrow the correct variant, covering connector type, flange pattern, and plunger stroke. A sample unit can be supplied for physical fitment confirmation before bulk ordering.

Q: My old part number is superseded — which current number replaces it and will it still fit? A: Superseded numbers like 3939700 or SA-4891-12 may replace earlier references while maintaining the same physical interfaces. We trace the full supersession path and verify that the replacement matches your engine serial range in connector orientation, mounting geometry, and plunger travel before confirming the order.

Q: Why do 3930658, 3932529, and SA-4756-12 all come up for the same application — are they interchangeable? A: These numbers cover different engine serial ranges and production runs within the 4BT and 6BT families. They are not freely interchangeable; connector type, flange pattern, and plunger stroke may differ. We verify the correct number against your engine dataplate to ensure a direct fit.

Q: Can I order one sample to verify fitment before placing a larger order? A: Yes. We support single-piece sample orders so you can physically install the solenoid on the engine and confirm connector mating, flange alignment, and plunger engagement before committing to a batch quantity. This is especially useful when dealing with worn nameplates or uncertain serial ranges.