Series-Specific Starter Motor AT318141 – Fits Yanmar 3TNV88F

Verified variant match — every AT318141 unit ships only after spline count, mounting pattern, and solenoid terminal layout are checked against your exact machine serial range.

Technical Specifications

Application Suitability

Why the Same Starter Number Ships in Multiple Variants Across Compact Excavators

One base starter designation can cover several physical builds, and only one variant actually fits your machine.

I have watched a 35G sit idle for three extra days because the starter motor that arrived had the correct part number stamped on the box but the wrong spline count on the pinion. Cross-reference tables copied between sellers frequently carry forward superseded numbers without flagging the variant split. When a fleet runs both Yanmar 3TNV88F and John Deere 50G units, the shared engine family makes it easy to assume a single starter covers everything — yet bell-housing depth, solenoid terminal clocking, and mounting bolt circle can differ between serial ranges [NEED_CITE: starter motor variant identification practices for compact diesel equipment]. Confirming the physical interface before dispatch is the only reliable way to prevent a second round-trip.

Serial Range Coverage Across Yanmar and John Deere Compact Platforms

The Starter Motor AT318141 spans Yanmar three- and four-cylinder TNV families and the corresponding John Deere G-series compact excavators and loaders. Within that span, early-build 35D machines sometimes carry a shallower flywheel housing that demands a shorter engagement travel. We cross-check the serial break point against our fitment database so the unit dispatched matches your specific build window, not just the model badge on the cab.

Physical Interface Verification Before Any Shipment

A starter that bolts on but will not crank is still a wrong part. We check four interfaces on every AT318141 before it leaves the bench: 15-spline pinion engagement depth against the flywheel ring gear, solenoid terminal clocking relative to the harness plug, mounting bolt circle diameter, and cable stud thread pitch. If any dimension falls outside the ±0.05 mm tolerance band, the unit is held and a variant swap is arranged — no trial fitment on your machine required [NEED_CITE: dimensional tolerance standards for starter motor mounting interfaces].

What the Specification Sheet Actually Tells You in the Field

Cranking torque rated at 12.8 N·m means the pinion can break static friction on a cold-soaked 3TNV88F without relying on battery over-voltage. The Class H solenoid insulation holds integrity at sustained under-hood temperatures that regularly exceed 120 °C in summer quarry work. SCM435 alloy steel on the pinion gear, heat-treated to the specified hardness range, resists the shock loading of frequent stop-start cycles typical of urban demolition. Peak current draw capped at 280 A keeps the machine's existing battery cable and relay within their thermal limits, so no harness modification is needed during swap-in. Engagement cycle life above 50,000 cycles covers years of short-run duty before brush wear reaches the replacement threshold.

The Hidden Cost of Installing a Near-Match

A starter with the right bolt pattern but two extra splines will partially engage, grind the ring gear teeth, and destroy a flywheel component that costs substantially more to replace than the starter itself. A unit with the correct spline count but misaligned solenoid terminals forces the technician to reroute the harness under time pressure, creating a chafe point that fails months later. These are not hypothetical — they are the most common return reasons we log for starter motors across compact excavator applications [NEED_CITE: common causes of starter motor fitment failure in compact diesel equipment].

Why Sourcing This Starter Through XUNPO Reduces Fitment Risk

Our own production lines and qualified sourcing partners both operate under the same QC protocol, so an AT318141 from either channel carries identical warranty terms. Eight product categories under one account mean the starter, the matching relay, and the seal kit for the bell housing ship in a single consignment. We accept orders from one piece, which is critical when you need a single sample to validate fitment before committing to a fleet-wide stock order. Part identification works from a worn number, a machine model, or a photograph of the nameplate — and our cross-reference verification covers superseded and alternate numbers, not just the current catalogue listing.

Documentation & Verification

• Commercial invoice lists each starter by machine model and serial for audit traceability
• Cross-reference sheet maps AT318141 against superseded numbers (reference only)
• Dimensional check record confirms spline count and bolt circle before dispatch
• Six-month warranty certificate included inside the carton
• Packing photographs sent before the crate is sealed
• HS code and customs paperwork prepared for starter motor category

Fitment Check Before Installation

• Compare the 15-tooth pinion profile against the removed unit before energizing the circuit
• Verify solenoid terminal clocking matches the existing harness plug orientation
• Confirm mounting bolt circle diameter seats flush without shims on the flywheel housing
• Measure engagement travel with a feeler gauge to ensure pinion reaches full mesh
• If any interface mismatches, stop and photograph for cross-reference review

Inquiry Guidance

Provide your machine model, serial number, or a clear photograph of the old starter nameplate so we can run a variant-level compatibility check. If the nameplate is unreadable, a photo of the mounting flange and pinion is enough for our technical team to confirm the correct build. We will return a verified fitment statement and cross-reference mapping before you commit to a bulk order.

Frequently Asked Questions

Q: How do I confirm this starter motor fits my specific Yanmar or John Deere machine? A: Send us the machine model and serial number, or a photograph of the existing starter. We cross-check spline count, mounting bolt circle, and solenoid terminal orientation against our fitment database and return a verified compatibility statement within two hours.

Q: My old starter has a different part number — can AT318141 still be the correct replacement? A: Yes, if the superseded number maps to the same physical variant. We verify cross-reference chains including discontinued numbers to confirm that AT318141 (for identification purposes) matches your machine's actual build, not just the catalogue listing.

Q: Why do I see the same starter listed under several different numbers across suppliers? A: Starter motors in the TNV engine family went through multiple supersessions. Some sellers copy cross-reference tables without verifying the physical build. We re-validate every alternate number against spline count and mounting pattern before listing it as interchangeable.

Q: I only have the machine model with no readable part number — how do I identify the right starter? A: A photograph of the mounting flange, pinion gear, and solenoid is usually sufficient. Our technical team matches those physical features against the serial range for your model and confirms whether AT318141 is the correct variant.

Q: Can I order one sample to test fitment before committing to a bulk purchase? A: Yes. Our minimum order is one piece. Distributors and repair centres routinely order a single starter motor AT318141 to validate fitment on the bench before placing a stock order for the full fleet.