| Specification Category | Detailed Specification |
|---|---|
| COGENG Set Number | CG-KOM-SET-62519910-9930 |
| OEM Reference Numbers | 6251-81-9910 (Main Engine Harness) & 6251-81-9930 (Auxiliary Engine Harness) |
| Engine Compatibility | SAA6D125E-5BR-W, SAA6D125E-5CR |
| Wire Insulation Material | High-Temperature Oil-Resistant XLPE |
| Connector Protection Rating | IP67 (Submersible up to 1m, 30 minutes) |
| Operating Temperature Range | -45°C to 165°C |
| System Voltage Rating | 24V DC System |
| Harness Type | Main Engine & Auxiliary Engine Harness Set |
| Quality Verification | 100% Paired Circuit Testing & Compatibility Validation |
| Warranty Protection | 18-Month Limited Warranty |
| NO | Number | Name | Qty |
| 1 | 6251-81-9910 | WIRING HARNESS | 1 |
| 1 | 6251-81-9930 | WIRING HARNESS | 1 |
| 2 | 6251-81-9940 | WIRING HARNESS | 1 |
| 3 | 6251-81-9740 | BRACKET | 1 |
| 4 | 01435-01065 | BOLT | 1 |
| 5 | 01435-01075 | BOLT | 1 |
| 6 | 6631-11-5630 | SPACER | 1 |
| 7 | 6166-11-5391 | SPACER | 1 |
| 8 | 600-051-2280 | CLIP | 2 |
| 9 | 01435-01040 | BOLT | 1 |
| 10 | 01435-01050 | BOLT | 1 |
| 11 | 01643-31032 | WASHER | 2 |
| 12 | 6218-81-8440 | CLAMP | 1 |
| 13 | 01435-01025 | BOLT | 1 |
| 14 | 6218-81-8490 | BAND | 1 |
| 15 | 08193-20010 | CLIP | 1 |
| 16 | 6631-11-5630 | SPACER | 1 |
| 17 | 01435-01035 | BOLT | 1 |
| 18 | 6251-81-9670 | BRACKET | 1 |
| 19 | 01435-01020 | BOLT | 1 |
| 20 | 6218-81-8440 | CLAMP | 1 |
| 21 | 600-051-2280 | CLIP | 1 |
| 22 | 01435-01025 | BOLT | 1 |
| 23 | 01643-31032 | WASHER | 1 |
| 24 | 6218-81-8490 | BAND | 1 |
| 25 | 6144-11-5630 | SPACER | 1 |
| 26 | 6218-81-8440 | CLAMP | 1 |
| 27 | 01435-01065 | BOLT | 1 |
| 28 | 6218-81-8490 | BAND | 1 |
| 29 | 6218-81-8490 | BAND | 3 |
| 30 | 6251-81-9270 | BRACKET | 1 |
| 31 | 01435-01020 | BOLT | 3 |
| 32 | 6218-81-8440 | CLAMP | 1 |
| 33 | 600-051-2200 | CLIP | 1 |
| 34 | 01643-31032 | WASHER | 1 |
| 35 | 6218-81-8490 | BAND | 1 |
| 36 | 6251-81-9660 | BRACKET | 1 |
| 37 | 01435-01090 | BOLT | 1 |
| 38 | 6218-81-8440 | CLAMP | 1 |
| 39 | 600-051-2180 | CLIP | 1 |
| 40 | 01435-01020 | BOLT | 1 |
| 41 | 01643-31032 | WASHER | 1 |
| 42 | 6218-81-8490 | BAND | 1 |
| 43 | 6152-11-9990 | SPACER | 1 |
| 44 | 600-051-2180 | CLIP | 1 |
| 44 | 600-051-2140 | CLIP | 1 |
| 45 | 01436-01060 | BOLT | 1 |
| 46 | 421-62-11940 | PLATE | 1 |
| 47 | 01435-01020 | BOLT | 1 |
| 48 | 01643-31032 | WASHER | 1 |
| 49 | 08193-20010 | CLIP | 1 |
| 50 | 6631-11-5630 | SPACER | 1 |
| 51 | 01010-81090 | BOLT | 1 |
| 52 | 01643-31032 | WASHER | 1 |
| 53 | 600-051-2180 | CLIP | 1 |
| 54 | 01435-01020 | BOLT | 1 |
| 55 | 01643-31032 | WASHER | 1 |
| 56 | 600-051-2140 | CLIP | 2 |
| 57 | 01435-01020 | BOLT | 1 |
| 58 | 6631-11-5630 | SPACER | 1 |
| 59 | 01435-01035 | BOLT | 1 |
| 60 | 01643-31032 | WASHER | 2 |
Disconnect battery and engine control modules before installation
Replace both harnesses together for optimal engine system performance
Follow exact OEM routing around engine components and through protective conduits
Ensure all sensor, injector, and actuator connectors are fully engaged and locked
Perform comprehensive engine system diagnostic after installation
Q1: Which Komatsu equipment models use the 6251-81-9910 and 6251-81-9930 engine wiring harness set?
A: This dual harness set is designed for Komatsu equipment powered by SAA6D125E-5 series engines, including excavators, dozers, and wheel loaders requiring OEM part numbers 6251-81-9910 and 6251-81-9930. Please verify compatibility with your machine model and serial number before ordering.
Q2: Why does this come as a dual harness set?
A: The SAA6D125E-5 engine uses two interconnected wiring harnesses – typically one for main engine management (6251-81-9910) and one for fuel injection/sensor systems (6251-81-9930). Both are required for complete engine electrical function.
Q3: Is this an OEM or aftermarket harness set?
A: It is an OEM-compatible replacement set, manufactured to meet or exceed original Komatsu quality standards for durability, electrical performance, corrosion resistance, and precise fit.
Q4: What is included in the COGENG dual engine wiring harness set?
A: The set includes both harness assemblies (6251-81-9910 and 6251-81-9930) with all necessary connectors, terminals, and wiring for complete engine management, fuel injection, and sensor systems.
Q5: What symptoms indicate I need to replace these engine harnesses?
A: Common signs include engine starting problems, injector fault codes, sensor communication errors, intermittent stalling, loss of power, poor fuel economy, and check engine lights.
Q6: Are these harnesses plug-and-play?
A: Yes, both harnesses are designed for direct plug-and-play fitment with OEM-spec connectors – no cutting, soldering, or modifications required for installation.
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
