Product name: Komatsu V-Belt Belt Set
Part No: 04120-21747
Model Number:For PC200 PC200LL PC210 PC220 PC220LL Engine 4D95L S4D95LE
Material:Lron+Rubber
Packing:PP bag inside, carton box outside
Payment Terms:Western Union, L/C, T/T, MoneyGram, D/A, D/P
MOQ:Acceptable trial order
Shipping Mode:By air, by sea, by express(Fedex, UPS, DHL, TNT, etc.)
Place of Origin:Guangdong, China
Brand name: COGENG
The COGENG 04120-21747 V-belt is a high-grade, direct-fit power transmission belt engineered specifically for Komatsu hydraulic excavators equipped with the 4D95L or S4D95LE engine series. This belt serves as a critical component in the engine’s accessory drive system, transferring rotational power from the crankshaft to the alternator, water pump, and cooling fan. Designed to meet or exceed OEM specifications, this V-belt ensures reliable operation under the high heat, heavy vibration, and continuous-load conditions typical of construction and mining job sites.
Crafted from a specially formulated chloroprene rubber compound with embedded polyester tensile cords, the COGENG 04120-21747 offers exceptional resistance to oil, grease, ozone, and thermal aging. Its precision-molded profile guarantees optimal friction contact with pulley grooves, minimizing slippage and maximizing energy transfer efficiency. Unlike generic aftermarket belts that may stretch or crack prematurely, this COGENG belt undergoes dynamic endurance testing to simulate over 5,000 hours of real-world excavator duty. Each belt is checked for dimensional accuracy, tensile strength, and dynamic elongation before packing, ensuring that you receive a product that starts correctly, fits perfectly, and performs consistently throughout its service life.
For fleet managers and owner-operators, choosing the COGENG 04120-21747 means reduced unplanned downtime, lower maintenance costs, and peace of mind that your critical cooling and charging systems remain fully operational even in the most demanding environments. Whether you are performing scheduled preventive maintenance or an emergency field repair, this belt is the reliable choice for keeping your Komatsu PC200, PC210, or PC220 working at peak productivity.
| Figure | Description |
|---|---|
| Figure 1 | Isometric view – Shows the belt’s overall trapezoidal cross-section, smooth back surface, and the precision-ground sidewalls that engage the pulley grooves. |
| Figure 2 | Cross-section diagram – Illustrates the internal polyester cord reinforcement layer, the compression rubber base, and the fabric-covered top surface, highlighting the structural integrity that resists lateral cracking. |
| Figure 3 | Installation routing guide – Overlay diagram on engine front end, indicating the belt path around the crankshaft pulley, alternator, water pump, and tensioner pulley (for models equipped with manual adjustment). |
| Figure 4 | Wear indicator comparison – Side-by-side visual of a new belt (sharp edges, uniform ribs) vs. a worn belt (glazed sidewalls, frayed cords, bottom cracks) to assist with field diagnosis. |
| Figure 5 | Dimension annotation – Highlights length (nominal 41.20 inches / 1046 mm), top width, and angle (40° included angle per ISO 4184) for verification against original equipment. |
| Figure 6 | Bending test demonstration – Shows the belt flexed around a minimum pulley diameter to prove flexibility without internal delamination. |
The COGENG 04120-21747 V-belt is compatible with the following Komatsu excavator models fitted with the 4D95L or S4D95LE naturally aspirated or turbocharged diesel engines. This belt is also suitable for certain crawler carriers and wheel loaders sharing the same engine platform – always confirm with your machine’s serial number prefix.
| Komatsu Model | Engine Series | Typical Application |
|---|---|---|
| PC200-5 | 4D95L / S4D95LE | Standard hydraulic excavator (12–14 ton class) |
| PC200-6 | 4D95L / S4D95LE | Updated model with improved hydraulic system |
| PC200-7 | 4D95L / S4D95LE | Tier 2 equivalent emission configuration |
| PC210-5 | 4D95L / S4D95LE | Heavy-lift variant with reinforced boom |
| PC210-6 | 4D95L / S4D95LE | Popular mid-size unit for quarry work |
| PC210-7 | 4D95L / S4D95LE | Electronic governor version |
| PC220-5 | 4D95L / S4D95LE | Higher horsepower variant for mass excavation |
| PC220-6 | 4D95L / S4D95LE | Upgraded cooling package requiring same belt |
| PC220-7 | 4D95L / S4D95LE | Latest mechanical fuel injection system |
Note: For models with a dual-alternator or air-conditioning compressor configuration, the auxiliary belt may differ – refer to the installation diagram in Section 4.
Installation Steps (Visual Summary):
Isolate power – Disconnect the battery negative terminal and allow the engine to cool.
Release tension – Loosen the alternator pivot bolt and adjuster locknut, then pivot the alternator inward to relieve belt tension.
Remove old belt – Slip the worn belt off the pulleys; inspect all pulleys for grooves, wear, and alignment.
Clean pulleys – Use a wire brush or compressed air to remove debris from pulley V-grooves – contamination accelerates belt wear.
Install new COGENG belt – Route the belt around the crankshaft pulley first, then over the water pump, fan hub, and alternator pulley per the routing diagram (Figure 3).
Apply tension – Move the alternator outward until the belt deflection at the longest span is approximately 10–12 mm (0.39–0.47 inch) under moderate thumb pressure (≈98 N / 22 lbf).
Torque fasteners – Tighten the alternator pivot bolt to 37–44 N·m (27–32 lbf·ft) and the adjuster locknut to 18–25 N·m (13–18 lbf·ft).
Recheck tension – Rotate the engine manually two full revolutions and re-measure deflection; adjust if necessary.
Final inspection – Ensure belt is seated fully in all grooves; run engine at idle for 2 minutes and observe for abnormal noise or flutter.
| Important Consideration | Detail |
|---|---|
| OEM Cross Reference | Replaces Komatsu part number 04120-21747 (identical form, fit, and function). Also compatible with 04120-21746 (supersession) and certain aftermarket variants, but always verify length. |
| Engine Family | Designed solely for the 4D95L and S4D95LE four-cylinder, direct-injection diesel engines. Not compatible with the 4D95S (supercharged) without verifying pulley count. |
| Pulley Condition | Worn or grooved pulleys will reduce belt life significantly. COGENG recommends replacing the tensioner pulley bearing and inspecting the fan hub bearing simultaneously. |
| Tension Type | This belt is used with a manually adjustable alternator bracket – not suitable for automatic spring-loaded tensioner systems found on later PC200-8 models unless retrofitted. |
| Operating Temperature | Rated for continuous ambient temperatures from –30 °C to +100 °C (–22 °F to +212 °F). For extreme heat (>50 °C ambient), increase inspection intervals to every 250 hours. |
| Fluid Exposure | Resistant to engine oil, diesel fuel, and coolants. However, prolonged soaking (e.g., leaking oil seal) will deteriorate rubber – correct any leaks before installation. |
| Storage Life | Store in a cool, dry place away from direct sunlight and ozone sources (e.g., electric motors). Shelf life is 5 years from date of manufacture when stored at <30 °C and <60% RH. |
| Break-in Period | During the first 2–3 hours of operation, re-tension the belt after the engine reaches operating temperature, as new cords may settle slightly. |
| Shipping Detail | Description |
|---|---|
| Shipping Methods | By Air, By Sea, By Express (FedEx, UPS, DHL, TNT, etc.). The specific arrangement will be based on the cargo situation and destination. |
| Estimated Delivery Time | Based on the shipping time of the logistics company. The arrival time shown by the carrier's tracking system shall prevail. |
| Packing | Inner: PP bag. Outer: Export-grade carton box with protective foam. Multiple belts are banded together to prevent abrasion during transit. |
| Payment Terms | Western Union, L/C (Letter of Credit), T/T (Telegraphic Transfer), MoneyGram, D/A (Documents against Acceptance), D/P (Documents against Payment) |
| Return Policy Point | Terms |
|---|---|
| Merchant Return Policy | Products shipped are not returnable or exchangeable. |
| Quality Guarantee | Every belt is dimensionally verified, visually inspected, and dynamically tested on a simulated pulley rig before shipment to ensure it is not Dead on Arrival (DOA). A test report is available upon request. |
| Pre-Shipment Confirmation | Photos and testing videos can be provided upon request before shipment to confirm correct part numbers and operational condition. We encourage customers to validate machine serial numbers prior to ordering. |
Q1: How do I know if this belt fits my PC210 with a 4D95L engine?
A: Confirm your engine model plate – if it reads 4D95L or S4D95LE, this belt is the correct dimensional replacement. Also, check your old belt’s printed number; if it ends with 21747, it is a direct match.
Q2: Can I use this belt on a PC200-8 with a SAA4D95LE engine?
A: No – the -8 series uses a different accessory drive layout with an automatic tensioner. Please contact COGENG for the correct belt for that engine variant.
Q3: What is the recommended replacement interval?
A: Under normal duty (8–10 hours/day), inspect every 500 hours and replace at 2000 hours or earlier if cracks, glazing, or fraying appear. For severe dusty or high-load conditions, reduce interval to 1500 hours.
Q4: Do I need special tools to install this belt?
A: Only standard metric wrenches (14 mm, 17 mm) and a pry bar for tensioning. No specialized pullers or tension gauges are required, though a belt tension gauge (e.g., Burroughs type) is recommended for fleet consistency.
Q5: What if the belt squeals after installation?
A: Re-check tension – squeal typically indicates insufficient tension. Also inspect pulley alignment; a misaligned alternator bracket is a common cause. If squeal persists, check for glazed pulley surfaces and clean with brake cleaner.
Q6: Is this belt oil-resistant?
A: Yes – the rubber compound is formulated to resist petroleum-based oils and hydraulic fluids. However, continuous oil immersion will shorten life; repair any leaks before installing a new belt.
Q7: Can I order a sample before bulk purchase?
A: Yes – COGENG supports sample orders for quality validation. Contact our sales team with your machine details to arrange sample shipment.
Q8: What does the “04120-21747” number signify?
A: This is Komatsu’s original part number. The first five digits (04120) denote the belt family, and the last five (21747) specify the exact length and profile. COGENG manufactures to these exact specifications.
For pricing, bulk orders, or technical support, contact your COGENG supplier today.
Please provide your machine model and serial number for compatibility verification.
Sales Price: Please contact COGENG sales customer service for specific prices.
Shipping method: The specific arrangement will be based on the cargo situation.
Estimated delivery time: It is based on the shipping time of the logistics company, and the arrival time shown shall prevail.
Contact details are at the bottom of this datasheet.
| Feature | Benefit |
|---|---|
| ✅ Direct OEM Replacement | Matches Komatsu 04120-21747 dimensions – no modifications needed |
| ✅ Durable — Built for Job Site Conditions | Resists heat, oil, ozone, and heavy shock loads |
| ✅ In Stock — Fast Shipping Worldwide | Available from multiple warehouses; express delivery options |
| ✅ Pre-shipment Verification | Photos and test videos available – order with confidence |
| ✅ Non-returnable but Quality-Backed | Every unit tested before dispatch – DOA risk eliminated |
| Parameter | Specification |
|---|---|
| Nominal Length (Outside) | 1046 mm (41.20 inches) |
| Effective Length (Pitch) | 1035 mm (40.75 inches) |
| Top Width | 13.0 mm (0.51 inch) |
| Belt Height | 8.0 mm (0.31 inch) |
| Angle | 40° ± 0.5° |
| Material | Chloroprene rubber + polyester cord |
| Tensile Strength (Min.) | 2.8 kN |
| Heat Resistance | Up to 120 °C continuous |
| Static Conductivity | ≤ 10⁶ Ω (anti-static, per ISO 1813) |
| Shelf Life | 5 years in original packaging |
| Weight per piece | Approx. 0.22 kg |
| Country of Origin | Manufactured in ISO 9001:2015 certified facility |
| Certification | REACH, RoHS compliant |
*shipping Details Return Sales*
Sales price:
Please contact COGENG sales customer service for specific prices.
Shipping method:
The specific arrangement will be based on the cargo situation.
Estimated delivery time:
It is based on the shipping time of the logistics company, and the arrival time shown shall prevail.
Contact details are at the bottom.
MerchantReturnPolicy:
The products shipped are not returnable or exchangeable.
Contact COGENG
📞 Phone: +86-185-2913-1515 🌐 Instagram
📧 Email: hugo@cogeng.net 🌐 Facebook：Excavator Parts Selection and Replacement Community
💬 WhatsApp +86-185-2913-1515 Facebook: Excavator Wiring Harness
💬 WeChat: +86-185-7865-1106 Facebook: Excavator Wire Harness
🌐 Website: cogeng.net Facebook: Excavator SolenoidValve
