Belt Tensioner 3976832 3911621 | Fast Dispatch for Cummins Engine
Belt Tensioner 3976832 3911621 — replacement for Cummins 4B3.9, 6B5.9, QSB5.9 engines...
504315786, 504028028, 87803067 Belt Tensioner — high-silicon gray iron housing, sealed double-row angular contact bearing, ±2.5 N·m spring force tolerance. Compatible with New Holland T6080, T6090, T7.210, TS6030, B115B, LB110.B and more. Held in Guangzhou warehouse stock, single-piece dispatch available, compatibility confirmed from machine model or photo within hours. Express and air freight options with arrival timing quoted upfront.
Arrival timeline provided with your quote, not after.
Immediate Dispatch — Guangzhou warehouse stock of belt tensioner units for New Holland T-series tractors verified on-shelf before payment confirmation.
| Parameter | Value |
|---|---|
| Part Number | 504315786, 504028028, 87803067, 2856945, 4892866, 504315781, 534026610, 2855622, 2852161 |
| Product Type | Belt Tensioner |
| Cross-Reference | 504315786, 504028028, 87803067, 2856945, 4892866, 504315781, 534026610, 2855622, 2852161 (cross-reference only) |
| Machine Fitment | T6080, T6090, T7.170, T7.185, T7.200, T7.210, TS6030, TS6.110, TS6.120, TS6.125, TS6.140, TS100A, TS115A, TS130A STANDARD, TS135A, T1804B, TV6070, U80B, T6010, T6020, T6030, T6040, T6050, T6060, T6070, LB110.B, LB115.B 4WS, LB75.B, LB90.B, B100B, B100BLR, B100BTC, B110, B110 TIER 3, B110B, B110BTC, B115, B115 TIER 3, B115B, B90B, B95, B95B, B95BLR, B95BTC, B95LR, B95TC, C190, L190, LS190.B, LT190.B, HW305, HW305S, HW325 |
| Condition | New Aftermarket |
| Housing Material | High-silicon gray iron (ASTM A48 Class 30B) |
| Bearing Type | Sealed double-row angular contact roller bearing (ISO 15:2021) |
| Spring Force Tolerance | ±2.5 N·m |
| Mounting Interface Accuracy | ±0.05 mm |
| Warranty | 3–12 months against manufacturing defects |
| Standards | ISO 9001, ASTM A48 Class 30B, ISO 15:2021, ISO/SAE J1927 |
| Failure Symptom | Replacement Urgency |
|---|---|
| Squealing or chirping noise at engine start-up | Immediate — indicates loss of belt grip |
| Visible belt slippage under PTO load | Same-shift replacement before further operation |
| Tensioner arm wobble or bearing noise | Schedule within next service window |
| Cracked or fatigued tensioner housing | Urgent — risk of sudden detachment |
| Belt tracking off-center on pulley groove | Replace tensioner and inspect belt alignment |
Real-time shelf verification eliminates phantom inventory delays.
When a loader backhoe goes down mid-job, the last thing a site supervisor needs is a system showing "in stock" only to discover the last unit shipped an hour earlier. I have watched machines sit idle for days because a warehouse system failed to reflect actual shelf status. A replacement Belt Tensioner in stock means nothing if the confirmation takes a full business day to arrive [NEED_CITE: aftermarket parts inventory accuracy in agricultural equipment distribution]. The gap between a quoted delivery window and the actual arrival is where downtime costs multiply — especially during harvest windows where each idle hour carries measurable financial consequence.
Every Belt Tensioner in stock at the Guangzhou warehouse is physically counted on the shelf before a quote goes out. I check the bin, not the screen. For New Holland T-series and TS-series applications — from T6080 through T7.210 — common part numbers are held at depth sufficient for single-piece emergency orders. You send a machine model, an engine code, or a photograph of the nameplate, and the identification is confirmed within hours, not days.
Shipping options and estimated arrival dates are presented at the quote stage, not buried in a follow-up email after payment. Express courier, air freight, and sea freight each carry different transit windows, and the right choice depends on how long the machine has already been down. A Belt Tensioner in stock for fast shipping replacement serves little purpose if the logistics leg introduces an unquoted week of transit [NEED_CITE: express freight transit time variability for heavy equipment parts to agricultural regions]. Packaging is structured to survive courier handling without adding dimensional weight penalties.
The high-silicon gray iron housing to ASTM A48 Class 30B provides the dimensional stability needed when the tensioner arm cycles through thermal expansion during sustained PTO operation. The sealed double-row angular contact roller bearing, built to ISO 15:2021, handles both radial load from belt tension and axial thrust generated by slight pulley misalignment common in field conditions. Spring force tolerance held to ±2.5 N·m ensures consistent belt engagement — too loose and the belt slips under load, too tight and bearing life shortens. Mounting interface machining accuracy at ±0.05 mm means the bolt pattern seats without shimming or reaming on the engine block.
An incorrect tensioner forces a choice between waiting for a replacement or attempting field modification. Neither outcome keeps the machine productive. A housing that bolts on but sits a few millimeters off the correct belt plane will shred the belt within operating hours, turning a single-component repair into a belt-and-tensioner job. In quarry loading or demolition contracting where equipment utilization is tracked by the hour, this cascading failure pattern is a familiar and expensive pattern [NEED_CITE: belt drive misalignment failure modes in heavy-duty mobile equipment].
Production on selected lines and qualified sourced supply both carry identical QC and warranty terms, so you are not managing separate vendor relationships for different part origins. Eight product categories sit under one account, meaning the belt, the tensioner, and any adjacent fasteners or gaskets ship in one consignment. Single-piece minimum order quantity removes the bulk commitment barrier that blocks emergency field purchases. Guangzhou warehouse stock on common New Holland numbers means fast dispatch on items that fail predictably. Part identification from a machine model number, engine serial, or a photograph of a worn nameplate eliminates guesswork. Cross-reference verification covers superseded and alternate numbers, and a technical team is available to confirm compatibility and grade before shipment.
Q: Is this Belt Tensioner in stock and when can it ship? A: Common New Holland part numbers including 504315786 and 504028028 are held in the Guangzhou warehouse. Stock is physically verified on the shelf before payment is requested, not pulled from a database that may lag behind actual movement. Once confirmed, dispatch typically follows within one working day, and your quote includes the estimated arrival date based on your selected freight method.
Q: Can I buy just one piece for an emergency repair? A: The minimum order is one piece. There is no bulk requirement or case-pack threshold blocking a single emergency purchase. Whether the machine is a T6090 sitting idle during harvest or a B110 loader backhoe needed for the next shift, a single Belt Tensioner ships without waiting to accumulate a larger order quantity.
Q: How fast will it arrive at my location? A: Express courier options deliver within days to most international destinations, while air and sea freight extend the window depending on distance and customs clearance speed. The arrival estimate is provided alongside the initial quote so you can plan machine downtime around a known delivery date rather than guessing at transit times after payment.
Q: My machine nameplate is worn or painted over — can you still identify the right part? A: Send a photograph of whatever identifying information remains — engine code, machine model designation, or even the physical shape and bolt pattern of the old tensioner. The technical team cross-references machine model against engine serial ranges and known superseded part numbers to confirm the correct unit before it ships.
Q: What happens if the part I receive does not fit? A: Compatibility is verified before dispatch using your machine model, engine serial, or photograph. In the event of a confirmed mismatch caused by a sourcing error on our side, replacement follows under warranty terms. The 3–12 month warranty covers manufacturing defects, and the replacement process is straightforward without extended return shipping disputes.
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