12V 10T Starter Motor 4996706 | Verified Fitment for Cummins

Variant-Level Fitment — Every 4996706 starter motor we ship is checked against your specific Cummins engine serial number and CM designation before dispatch, eliminating wrong-variant deliveries.

Technical Specifications

Application Suitability

Why the Same Starter Number Ships in Multiple Variants Across Cummins Generations

The base part number alone does not guarantee the starter will physically fit your engine build.

I have spent years pulling parts from European and North American distribution channels, and one pattern keeps repeating: the starter motor 4996706 appears in service manuals spanning the 4B3.9 through the QSB6.7, yet the flange hole spacing, connector direction, and solenoid clocking can differ between a CM850 and a CM2350 build of the same displacement. Copied cross-reference tables on aftermarket listings frequently carry forward errors from superseded numbers, so a buyer ordering from a screenshot of an online table may receive a unit that bolts up but cannot connect to the existing harness. [NEED_CITE: Cummins service bulletin practices for superseded electrical component numbers]

When the machine is already on a construction site or in a mining pit, discovering a fitment mismatch after the old starter is out means the equipment stays down while a replacement ships. That downtime compounds quickly when the machine is on a critical path.

Engine Serial Range and CM Designation Coverage

This Starter Motor 4996706 is listed across a wide span of Cummid engine families — from the compact B3.3 and 4B3.9 through the mid-range QSB4.5 and QSB5.9, up to the QSB6.7 and ISB/ISD6.7 platforms. The coverage is broad, but broad does not mean universal. Each engine generation introduced changes to the flywheel housing interface and the electrical connector specification. The CM designation on your engine dataplate — whether CM850, CM2150, CM2250, or CM2350 — is the single most important data point for confirming that this starter will engage your specific ring gear and connect to your wiring harness without modification. Providing the engine serial number allows us to pull the exact build record and verify the variant before anything ships.

Mounting Pattern, Connector Orientation, and Gear Mesh Verification

The physical interfaces on a starter motor are where most wrong-part situations surface. For this unit, the critical checks are the flange mounting bolt pattern relative to the flywheel housing, the solenoid terminal orientation relative to the existing cable routing, and the 10-tooth drive gear engagement depth with the ring gear. Across the QSB4.5 and QSB6.7 variants, the bolt circle may remain constant while the connector clocking rotates to accommodate different harness layouts on different equipment installations. A starter that bolts on but forces the cable into a sharp bend will see premature terminal failure. We verify port position and spline count against your existing unit or the engine build sheet so that the replacement arrives ready to install. [NEED_CITE: starter motor drive gear engagement specifications for medium-duty diesel engines]

Voltage, Tooth Count, and Sealed Housing Explained

The 12V rating places this starter squarely in the standard electrical system range for Cummins-powered construction and industrial equipment — matching the alternator output and battery bank configuration typical across wheel loaders, excavators, and gensets using these engine platforms. The 10T drive gear specification must match the tooth pitch and module of the flywheel ring gear; a mismatch here will not simply cause noise but will prevent cranking entirely or damage the ring gear within the first engagement cycle. The sealed housing construction addresses the operating reality of equipment in dusty quarry environments, high-humidity port logistics sites, and cold-weather agricultural applications where moisture ingress into the solenoid or brush chamber accelerates internal corrosion. These are not optional upgrades — they are baseline requirements for any starter expected to survive beyond a single season in off-road service.

The Hidden Cost of a Fitment Mismatch

Ordering a starter that physically bolts on but has the wrong connector orientation or incorrect drive gear mesh creates a cascade of problems. The machine may crank once or twice before the gear strips, or the harness may be stretched to reach a misaligned terminal, introducing a resistance point that causes intermittent starting failures weeks later. In a mining or heavy-construction context, that second failure often happens under load on a shift change, when the operator attributes the no-start to batteries or fuel and wastes further diagnostic time before the root cause surfaces. The return shipment, replacement lead time, and accumulated idle hours on dependent equipment typically dwarf the cost difference of doing the fitment check correctly the first time. [NEED_CITE: equipment downtime cost factors in heavy construction operations]

Why Sourcing This Starter Here Reduces Fitment Risk

Our own production lines and qualified sourced supply operate under one account and one warranty structure, so whether your starter comes from our facility or a verified partner, the QC terms are identical. We cover eight categories of engine and machine parts, which means if your repair list also includes seals, filters, or belt drive components, they ship as one consignment against one set of documents. The one-piece minimum applies — there is no MOQ blocking a single emergency starter. Our Guangzhou warehouse holds stock on fast-failure items for rapid dispatch. Part identification works from a part number, machine model, a photograph of the existing unit, or even a painted-over nameplate image. Cross-reference verification covers superseded and alternate numbers, and we offer sample supply so you can physically confirm fitment before committing to a fleet-level bulk order. Our technical team is available to confirm compatibility and variant grade against your engine serial number.

Documentation & Verification

• Commercial invoice and packing list with part number 4996706 and variant designation clearly stated
• Cross-reference sheet listing 4280007090, 4280007091, and related numbers marked as reference only
• Quality inspection record covering gear tooth profile, voltage draw, and solenoid function test
• Warranty terms document specifying coverage period and manufacturing defect scope
• Packing photographs showing unit condition and protective packaging before crate closure
• HS code and customs documentation support for international shipment of electrical starting equipment

Fitment Check Before Installation

• Compare flange bolt circle diameter and hole count against the removed starter or flywheel housing drawing
• Verify 10T drive gear tooth condition and pitch against the ring gear before final mounting
• Check solenoid terminal orientation matches existing cable routing without forcing or bending harness
• Confirm connector pin count and keying match the engine wiring harness plug
• Bench-test the unit with a known-good 12V source to verify engagement and spin direction before installation
• If any dimension or interface does not match, contact us with photographs before proceeding

Confirm Your Exact Variant Before Ordering

Send us your Cummins engine model, serial number, and CM designation — or a clear photograph of the engine nameplate and the existing starter label. We will verify the correct variant of Starter Motor 4996706 against your specific build, confirm the applicable cross-reference number, and advise on any fitment notes before you commit to an order.

Frequently Asked Questions

Q: How do I confirm this starter fits my Cummins engine when I only have the machine model? A: The machine model gives us a starting point, but Cummins engines within the same machine model can span multiple CM designations and serial ranges. We use the machine model to narrow the engine family, then request the engine serial number or a nameplate photograph to verify the exact variant. This two-step check prevents shipping a starter that matches the base number but has a different flange or connector configuration for your specific build.

Q: Why are there multiple cross-reference numbers for the same starter, and which applies to my engine? A: Numbers like 4280007090, 4280007091, and 4380003110 represent the same base starter across different production runs, equipment OEM installations, and superseded revisions. The correct reference for your engine depends on the build date and CM designation. We verify the applicable number against your engine serial record so the unit we ship matches the variant your wiring harness and flywheel housing expect.

Q: Can I get a sample to test fitment before placing a larger fleet order? A: Yes. We supply a single sample unit so you can physically verify the flange pattern, connector orientation, and drive gear engagement on one machine before committing to a bulk order. This is particularly useful when standardising across a mixed fleet where several Cummins variants are in service and you need to confirm coverage before stocking.

Q: My existing starter has a different number than 4996706 — is it still compatible? A: It may be. Several numbers in this cross-reference family — including 4280007092 and 5128000980 — represent superseded or alternate listings for the same application. Send us the number from your existing unit along with the engine serial number. We will check whether it maps to the 4996706 variant for your specific engine build or whether a different unit is required.

Q: How do you verify cross-reference accuracy when online tables conflict? A: We do not rely on copied aftermarket tables. Each cross-reference number is verified against engine build records and our own fitment database, which tracks superseded numbers, variant changes, and known conflicts across Cummins generations. When two online sources disagree, the engine serial number and physical interface check resolve the question definitively. [NEED_CITE: aftermarket cross-reference verification methodology for engine electrical components]