12V 2.2KW Starter Motor 6670727 – Fits Bobcat 325 E35 E50

Fitment Verified by Serial Range — Every 6670727 starter motor cross-reference is validated against Bobcat machine serial breaks, preventing tooth-count or rotation mismatches before dispatch.

Technical Specifications

Application Suitability

Why the Same Part Number Ships in Multiple Variants

Confirm rotation, tooth count, and voltage before assuming any 6670727 listing will fit.

A starter motor for Bobcat 325 328 E35 E50 may share the same base designation across several machine generations, yet differ in drive gear tooth count or rotation direction depending on the engine build installed at the factory. Sellers who copy cross-reference tables between listings often carry forward errors from one variant to another, resulting in a part that physically bolts on but fails to engage the flywheel ring gear. In珠三角 workshops, I have seen a two-tooth difference destroy a ring gear within seconds of cranking. [NEED_CITE: starter motor drive gear engagement failure modes in compact excavators]

Serial Range Coverage Across the Bobcat Compact Line

The starter motor for Bobcat 325 328 E35 E50 spans three distinct equipment families: the numeric-series excavators from 325 through 341, the E-series from E25 to E55, and the S100 skid steer loader. Within each family, serial breaks determine whether the original factory fitment used a 9-tooth or 10-tooth drive gear, and whether rotation is clockwise or counter-clockwise. Verifying your machine serial number against the supersession chain — 6670727 through NDAS228000-6921 and SND0408 — rules out the wrong variant before the unit leaves the shelf.

Mounting Pattern and Terminal Verification

Even when the part number matches, port position and connector type can differ between production runs. The 10-tooth CW drive gear must align precisely with the flywheel ring gear engagement depth, and the wiring harness connector must mate without adapter modifications. When nameplates are worn or painted over, a photograph of the original starter motor — showing terminal posts and mounting flange — allows visual cross-checking against the replacement unit's physical layout. [NEED_CITE: compact excavator electrical connector identification standards]

Decoding the Electrical Ratings for Field Conditions

A 12V system draws peak current during cold cranking, and the 2.2KW output rating determines whether the starter can overcome compression resistance in cold-soaked diesel engines. The 10-tooth drive gear ratio is matched to the flywheel ring gear tooth count, ensuring sufficient cranking RPM for ignition without overspeeding the armature. CW rotation is dictated by the engine's flywheel housing orientation; installing a CCW unit in a CW application will freewheel without engagement. These parameters are non-negotiable — a voltage mismatch burns the solenoid within days, and a tooth-count mismatch strips the ring gear.

The Hidden Cost of Skipping Fitment Verification

When a starter motor arrives with the wrong spline engagement or mounting bolt pattern, the machine remains down while the return shipment crosses borders and the correct unit dispatches. Forced installation of a near-match unit — wrong tooth count pressed into mesh under load — accelerates ring gear wear and can fracture drive gear teeth during the first high-torque cranking event. The resulting repair extends from a single-component swap into a flywheel housing teardown, multiplying labor hours and secondary parts consumption. [NEED_CITE: flywheel ring gear damage from mismatched starter drive engagement]

Why Source This Starter Motor Through XUNPO

Own production lines and qualified sourced partners operate under a single warranty account, so whether your starter motor comes from our facility or a certified partner, the coverage terms are identical. Cross-reference verification covers the full supersession chain — not just the primary number — catching alternate references like 410-52186 and 18447N that copied tables often miss. One-piece minimum order means a single emergency replacement ships without MOQ barriers. Guangzhou warehouse stock enables rapid dispatch on common Bobcat fitments. Sample units are available for physical fitment confirmation before fleet-level commitments, eliminating trial-fitment risk on multiple machines.

Documentation & Verification

• Commercial invoice lists 6670727 with full cross-reference chain marked as reference only
• Part compatibility sheet maps your machine serial number to confirmed starter variant
• Dimensional check on mounting bolt pattern and drive gear tooth count before dispatch
• Warranty terms cover 3–12 months from shipment date with clear claim procedure
• Packing photographs show terminal posts and nameplate before crate closure
• HS code and export documentation prepared for destination customs clearance

Fitment Check Before Installation

• Compare mounting flange bolt hole spacing against the removed starter before wiring connection
• Verify 10-tooth drive gear meshes cleanly with flywheel ring gear by hand rotation
• Match terminal post orientation and connector type to existing harness without adapters
• Confirm CW rotation direction stamped on nameplate matches machine specification
• Bench-test solenoid engagement stroke before final installation in bell housing
• If tooth count or rotation mismatches, halt installation and request cross-reference recheck

Request a Fitment Confirmation

Provide your Bobcat machine model, serial number, or a photograph of the existing starter nameplate. Our technical team will verify the correct variant against the full cross-reference chain and confirm drive gear tooth count, rotation direction, and terminal configuration before quoting.

Frequently Asked Questions

Q: How do I confirm this starter motor fits my specific Bobcat excavator or loader? A: Share your machine model and serial number, or send a clear photograph of the existing starter nameplate. We cross-check the serial break against the supersession chain — 6670727, SND0408, 228000-6921 and alternates — and confirm tooth count, rotation, and terminal layout match your exact build.

Q: My old part number does not match 6670727 exactly — is it still the right replacement? A: Likely yes. Bobcat superseded starter part numbers across production runs, and references like 410-52186, 18447, or NDAS228000-6921 all map to the same 12V 10-tooth CW unit. We verify the full interchange chain to confirm your original number resolves to this fitment before shipping.

Q: Why do different sellers list different cross-reference numbers for the same Bobcat model? A: Cross-reference tables are frequently copied between aftermarket listings without validation, and variant differences within a single machine model — such as engine build changes mid-production — create alternate part numbers. We independently verify each reference against machine serial ranges rather than relying on third-party tables.

Q: Can I get a sample to test fitment before ordering in bulk? A: Yes. A single sample unit ships under the same warranty terms as a bulk order. Install it on one machine, confirm engagement, cranking performance, and terminal compatibility, then proceed with the full fleet quantity once fitment is verified on your specific serial range.

Q: I only have the machine model, no readable part number — can you still identify the correct starter? A: Provide the machine model and serial number. The serial break tells us which engine build was installed at the factory, which in turn determines the correct starter variant. If the serial plate is also unreadable, a photograph of the mounting flange and terminal posts allows visual identification.