Belt Tensioner 3936202 3917485 for Hyundai Excavator R210LC-7 – Cross-Reference

Cross-reference verified — Belt Tensioner 3936202 (cross-reference only) and 3917485 (cross-reference only) fitment confirmed across Hyundai R-series excavators with Cummins 4BT/6BT engines before shipping.

Technical Specifications

Application Suitability

Why the Same Belt Tensioner Number Ships in Multiple Variants

A single base number can map to different physical tensioner assemblies across engine generations.

In the Guangzhou warehouse, I have handled return shipments where a Belt Tensioner 3936202 for Hyundai Excavator R210LC-7 cross reference looked correct on paper but would not bolt up because the engine build used an earlier variant. Copied cross-reference tables online often list 3917485 and 3936202 as interchangeable without noting that the pulley diameter and spring tension calibration differ between 4BT and 6BT builds [NEED_CITE: Cummins engine accessory drive configuration differences across serial ranges]. A wrong tensioner means the machine sits until the right one arrives, which on a quarry site with a single excavator translates to lost tonnage every hour.

Machine Serial Range and Variant Coverage

The Hyundai R-series excavators covered here span production runs that used different Cummins engine variants under the same machine model designation. A Belt Tensioner 3936202 for Hyundai Excavator R210LC-7 cross reference must account for whether the specific unit carries an early 6BT or a later QSB6.7, because the accessory drive bracket changed between these builds. I always ask for the engine serial number or a photograph of the existing tensioner arm to confirm which variant applies before confirming supply.

Pulley Geometry and Mounting Pattern Verification

The physical differences between tensioner variants come down to measurable details: mounting hole spacing on the bracket, pulley outer diameter, arm pivot angle, and spring preload rating. For the R130LC-3 equipped with a 4BT, the tensioner arm is shorter and the pulley rides a narrower belt path compared to the 6BT-equipped R210LC-3. When an old nameplate is unreadable, a photograph of the existing unit next to a ruler lets us confirm these dimensions against our reference database [NEED_CITE: belt drive system alignment tolerances for diesel engine auxiliary components].

Understanding Superseded Number Chains

The reference numbers 3936202, 3917485, 3918944, 3934817, 3936203, 3967188, and 3964636 form a chain of superseded and alternate identifiers. Some numbers were reassigned when Cummins revised the tensioner spring specification; others reflect bracket geometry updates for different equipment applications. Tracing which number in this chain corresponds to your specific engine serial is the critical step. Our cross-reference sheet maps each number to the engine builds it covers so you do not have to guess.

What Happens When the Wrong Variant Gets Installed

A tensioner that bolts on but has incorrect spring calibration will either over-tension the belt, accelerating bearing wear on the alternator and water pump, or under-tension it, causing slip and heat damage to the belt and pulley grooves. On a machine working in dusty quarry conditions, a slipping belt on the water pump circuit can push coolant temperatures past the threshold before the operator notices [NEED_CITE: thermal derating effects on diesel engines from accessory drive belt slip]. Sending back the wrong part and waiting for the correct replacement compounds the downtime on top of the original failure.

Why Fitment Verification Is Built Into Our Process

We source from qualified ISO 9001 manufacturing partners and carry selected tensioner lines in our Guangzhou warehouse for fast dispatch. Every inquiry starts with a fitment conversation: we verify your machine model, engine designation, and ideally the existing part number or a photograph. Our cross-reference verification covers the full superseded number chain so the Belt Tensioner 3936202 for Hyundai Excavator R210LC-7 cross reference you receive matches your engine build. For buyers placing volume orders across a mixed fleet, we supply sample units for physical trial fitment before bulk commitment, removing the risk of ordering a container load of the wrong variant.

Documentation & Verification

• Commercial invoice listing machine model and confirmed cross-reference number for each line item
• Compatibility sheet mapping your engine serial to the applicable tensioner variant (reference only)
• Dimensional inspection record covering pulley diameter, mounting hole spacing, and arm pivot angle
• Warranty terms specifying coverage period and manufacturing defect claim procedure
• Packing photographs taken before carton sealing for transit condition documentation
• HS code and export customs documentation prepared for destination country requirements

Fitment Check Before Installation

• Compare mounting hole pattern on new tensioner bracket against existing unit or engine block face
• Verify pulley outer diameter and groove profile match the belt specification for your engine model
• Check spring preload by compressing the arm and confirming resistance feels consistent with removed unit
• Inspect pivot bushing for smooth rotation without lateral play before bolting to the bracket
• Route belt per engine service manual diagram and confirm tensioner arm sits within marked operating range

Confirm Fitment Before You Order

Provide your Hyundai excavator model, Cummins engine designation, and engine serial number so we can verify the correct tensioner variant against our cross-reference database. If the nameplate is gone or the existing part number is unreadable, send a photograph of the current tensioner unit and the engine data plate. We will return a confirmed fitment match and a reference-only cross-reference sheet with your quotation.

Frequently Asked Questions

Q: How do I confirm this tensioner fits my specific Hyundai excavator model and engine build? A: Send us your machine model and the Cummins engine designation printed on the engine data plate. If available, include the engine serial number. We cross-reference these details against our fitment database to verify the correct tensioner variant, checking pulley diameter, arm geometry, and spring calibration for your specific engine build before confirming supply.

Q: My old part number doesn't appear — can a superseded number still work on my machine? A: Yes, in many cases a superseded number remains fully compatible. The reference chain for this tensioner includes 3936202, 3917485, 3918944, 3934817, 3936203, 3967188, and 3964636. We trace which number in the chain was current for your engine serial range and confirm the replacement variant that fits your specific build without modification.

Q: Why do multiple reference numbers exist for what looks like the same tensioner? A: Cummins revised the tensioner design across engine generations, changing spring calibration, pulley diameter, or bracket geometry while keeping the same basic function. Each reference number corresponds to a specific engine build or equipment application. Our cross-reference sheet (reference only) maps these variants so you can identify which one applies to your machine.

Q: I only have the machine model, no readable part number — can you identify the right tensioner? A: Yes. We can narrow the correct tensioner variant using your Hyundai excavator model and production era, then ask for a photograph of the existing unit or the engine data plate to confirm the final match. This approach works when nameplates are worn, painted over, or missing entirely, and it avoids the trial-and-error of ordering blind.

Q: Can I order a sample first to verify fitment before buying in bulk? A: We supply sample units for physical fitment trials before volume commitment. This is particularly useful for fleet operators standardizing tensioner supply across mixed Hyundai excavator fleets or repair centres confirming a new cross-reference number. The sample lets you verify bolt pattern, arm geometry, and belt routing on the actual machine before placing the full order.