Camshaft Gear 3946436 replacement for Cummins 4B3.9, 6B5.9, QSB and ISB series engines and Hyundai HL757-7 loaders, high-grade steel with HRC 58–62 heat treatment. Stocked in Guangzhou warehouse for same-week dispatch, one-piece minimum order supports emergency repairs, and part identification from photograph or machine model when the number is unreadable. Express, air and sea freight options quoted upfront with arrival timing confirmed before order.
Arrival time quoted at order confirmation based on selected freight method.
In-Stock and Ready — Camshaft Gear 3946436 sits on our Guangzhou shelf today, boxed and waiting for a single-piece emergency order or a workshop turnaround that cannot slip into next week.
| Parameter | Value |
|---|---|
| Part Number | 3946436 |
| Product Type | Camshaft Gear |
| Cross-Reference | J946436, K3946436 (for identification purposes) |
| Machine Fitment | 4B3.9, 6B5.9, G8.3, ISB, ISB CM2150, ISB CM550, QSB3.9 30 CM550, QSB4.5 30 CM550, QSB5.9 30 CM550, HL757-7, HL757TM-7, 100D-7, 120D-7, 135D-7, 160D-7 |
| Brand Compatibility | Compatible with Cummins and Hyundai equipment |
| Material | High-grade steel |
| Condition | New Aftermarket |
| Warranty | 3–12 months against manufacturing defects |
| MOQ | 1 piece |
| Lead Time (in-stock) | 2–5 working days dispatch |
| Quality Standard | ISO 9001 |
| Failure Symptom | Replacement Urgency |
|---|---|
| Engine timing drift or erratic valve events on Cummins 4B3.9 / 6B5.9 | Immediate — machine already down, bay occupied |
| Metallic debris in oil filter from worn gear teeth on QSB series | High — secondary damage risk if deferred |
| Loader HL757-7 engine fails to start after overnight park | Critical — jobsite halted mid-shift |
| Dozer 120D-7 rough idle and misfire under load | Moderate — schedule replacement before next heavy cycle |
| ISB CM2150 abnormal gear noise at cold start | Preventive — inspect teeth and backlash now |
A Camshaft Gear 3946436 replacement on the shelf means the engine bay door closes this week, not next month.
When a wheel loader like the HL757-7 drops timing on a crowded jobsite, the repair bay clock starts ticking and the next machine in line cannot get in. Waiting several days just to confirm whether a worn part number is still valid burns daylight the crew does not have. I once had a contractor send a blurry nameplate photo at two in the morning; by the time we traced the correct fitment, the loader had sat idle through an entire shift [NEED_CITE: equipment downtime cost modeling for earthmoving contractors]. A fast answer on Camshaft Gear 3946436 availability keeps the repair moving instead of stalling at the identification stage.
Identification is where most emergency orders stall. You send a part number scraped off a worn gear, or a machine model when the plate is painted over, and the seller asks for more information while the machine sits cold. Here, a photograph of the old Camshaft Gear 3946436 or a clear shot of the engine nameplate is enough for us to verify fitment within hours. We cross-check the number against superseded references like J946436 and K3946436 (cross-reference only) so the gear that arrives actually fits the block in your bay.
Stock status is only half the equation — how fast the Camshaft Gear 3946436 replacement reaches your workshop door is the other half. From our Guangzhou warehouse, express courier typically delivers within days for urgent single-piece orders, air freight covers the middle ground for small batches, and sea freight handles planned restocking at lower cost. We quote the estimated arrival window at the time of order, not after the invoice is paid [NEED_CITE: international freight transit benchmarks for aftermarket engine parts]. That way you can decide whether the machine waits for express or whether a scheduled air shipment fits the repair timeline.
High-grade steel in a camshaft gear must hold tooth geometry under continuous torsional load from the timing train. Heat treatment in the HRC 58–62 range (source value — verify against manufacturer catalog) keeps the flank surface hard enough to resist micro-pitting while leaving the core tough enough to absorb shock loads during cold cranking. Dimensional tolerance at ±0.02mm (source value — verify against manufacturer catalog) controls backlash across the mating gear set — too loose and the timing drifts, too tight and tooth contact concentrates on a narrow band, accelerating wear. These are the numbers the engine cares about once the cover goes back on.
Ordering the wrong variant of a camshaft gear does not just waste freight money — it extends downtime by days. A gear that bolts on but has incorrect tooth count throws valve timing far enough to cause a no-start or, worse, piston-to-valve contact on interference engines like some ISB builds. The repair then escalates from a single-gear swap to a head-off inspection with new valves and gaskets. Every hour that Camshaft Gear 3946436 sits in a return box is another hour the loader or dozer earns nothing [NEED_CITE: engine timing failure escalation in interference design diesel engines]. Confirming fitment before dispatch avoids that cascade entirely.
Our Guangzhou warehouse carries Camshaft Gear 3946436 as a stocked line, so availability is a statement of fact rather than a promise to check with the factory. The one-piece minimum means an emergency repair orders exactly what it needs without padding to meet a volume threshold. We accept identification by part number, machine model, photograph, or nameplate image — whichever is legible on a worn component. Cross-reference verification covers superseded and alternate numbers so legacy equipment still gets the correct part. Self-produced and qualified sourced lines carry the same warranty terms, keeping accountability under one account.
Send us the part number you have, the machine model from the cab decal, or a photograph of the worn gear and nameplate. We will confirm Camshaft Gear 3946436 stock status, the dispatch window, and the estimated arrival for your chosen freight method — all before you commit to an order.
Q: Is Camshaft Gear 3946436 in stock right now? A: Yes, we hold Camshaft Gear 3946436 in our Guangzhou warehouse for immediate dispatch. Stock levels are updated on each order cycle, so send your quantity requirement and we confirm availability and the dispatch window on the same business day.
Q: What is the minimum quantity I can order? A: One piece. The single-piece minimum is designed for emergency repairs where a machine is already down and waiting. You do not need to meet a volume threshold to get a Camshaft Gear 3946436 shipped from our stock.
Q: How fast can it reach my jobsite? A: In-stock items dispatch within 2–5 working days. Express courier covers most destinations in a matter of days after dispatch, while air freight adds transit time at lower cost. We quote the estimated arrival when you place the order.
Q: My nameplate is unreadable — can I send a photo to confirm fitment? A: Yes. Send a clear photo of the worn Camshaft Gear 3946436 or the engine nameplate and our team will cross-reference it against compatible models including Cummins 4B3.9, 6B5.9, and Hyundai HL757-7 within hours.
Q: What happens if the part arrives and doesn't fit? A: Contact us immediately with photos of the received gear alongside the old unit. We verify the mismatch against our compatibility records and arrange a replacement or refund under the warranty terms covering manufacturing defects.
Not sure if this part fits your machine? Send us your machine model number and serial number via WhatsApp or email -- our specialists will verify compatibility within 2 hours.
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