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| Specification Category | Technical Specifications |
|---|---|
| Compatible Applications | Hitachi Excavator Models (Compatible with 4681837 & 4449447 applications) |
| COGENG Part Number | CG-HITACHI-PMH12 |
| Replaces OEM Part Numbers | 4681837, 4449447 |
| Product Name | Premium Main Wiring Harness Assembly |
| Application Scope | Complete excavator electrical system integration |
| Wire Specifications | XLPO insulation (-40°C to 150°C), oil/fuel/abrasion/chemical resistant |
| Connector System | IP68 rated sealed connectors, OEM-specification compliant |
| Quality Assurance | 8-stage testing protocol including thermal cycling and vibration testing |
| Warranty Coverage | 3,000-hour premium warranty |
| NO | Number | Name | Qty |
| 1 | 0005473 | HARNESS;WIRE | 1 |
| 01A | 4423418 | FUSIBLE LINK(65A) | 1 |
| 01B | 4315323 | FUSIBLE-LINK(45A) | 1 |
| 01C | 4690816 | CONNECTOR | 1 |
| 01D | 4690815 | CONNECTOR | 1 |
01E |
4449447 | HARNE5S;WIRE | 1 |
| 4681837 | HARNESS;WIRE | 1 | |
| 1 | 0006494 | HARNESS;WIRE | 1 |
| 01A | 4423418 | FUSIBLELINK(65A | 1 |
| 01B | 4315323 | FUSIBLE-LINK(45A) | 1 |
| 01C | 4690816 | CONNECTOR | 1 |
| 01D | 4690815 | CONNECTOR | 1 |
| 01E | 4449447 | HARNE5S;WIRE | 1 |
| 4681837 | HARNESS;WIRE | 1 | |
| 02 | J950010 | NUT | 5 |
| 04 | A590110 | WASHER;PLANE | 5 |
| 05 | 4055311 | CLIP;BAND | 16 |
| 07 | 4259220 | CLIP | 1 |
| 08 | 4192035 | CLIP | 4 |
| 09 | 4449250 | CLIP | 8 |
| 10 | 4190275 | CLIP | 2 |
| 11 | 4450494 | CLIP | 3 |
| 13 | 4190261 | CLIP | 3 |
| 14 | 4254600 | CLIP | 5 |
| 15 | 4190273 | CLIP | 4 |
| 16 | 4257159 | BRACKET | 1 |
| 17 | 3106886 | BRACKET | 1 |
| 18 | 4452158 | RELAY | 1 |
| 19 | 4681233 | RELAY | 1 |
| 20 | 4190277 | CLIP | 3 |
| 22 | 4190264 | CLIP | 10 |
| 25 | J271020 | BOLT;SEMS | 29 |
| 25A | J901020 | BOLT | 1 |
| 25B | J222010 | WASHER | 1 |
| 26 | 4418301 | BRACKET | 1 |
| 27 | J450520 | SCREW;SEMS | 2 |
| 29 | J260616 | BOLT;SEMS | 3 |
| 29A | J900616 | *BOLT | 1 |
| 29B | A590106 | WASHER;PLANE | 1 |
| 30 | J260612 | BOLT;SEMS | 1 |
| 30A | J900612 | *BOLT | 1 |
| 30B | A590106 | WASHER;PLANE | 1 |
| 31 | J260816 | BOLT;SEMS | 2 |
| 31A | J900816 | *BOLT | 1 |
| 31B | A590108 | WASHER;PLANE | 1 |
| 36 | 4651943 | SENSOR;THERMO | 1 |
| 37 | 4651944 | SENSOR;PRES. | 1 |
| 40 | 4449250 | CLIP | 2 |
| 66 | 4257159 | BRACKET | 1 |
| 66 | 4190261 | CLIP | 1 |
| 75 | J271020 | BOLT;SEMS | 1 |
| 75A | J901020 | BOLT | 1 |
| 75B | J222010 | WASHER | 1 |
| 75 | 4257159 | BRACKET | 1 |
Complete Electrical System Shutdown: Perform full power down procedure including battery disconnection, main power isolation, and verified capacitor discharge period (minimum 15 minutes)
Detailed Pre-Installation Documentation: Create comprehensive photographic records of existing harness routing, connector positions, and all securing point locations
Proper Connector Handling Procedure: Carefully release all locking mechanisms before disconnection - always pull on connector housings, never on wires
Systematic Component Inspection: Conduct thorough examination of all sensors, control units, and mating connectors for damage, corrosion, or pin issues
Exact Factory Routing Compliance: Follow precise OEM routing path, ensuring proper placement in all clamps, guides, and protective conduits
Comprehensive Connection Verification: Implement step-by-step connection process, verifying all connectors are fully seated with positive locking confirmation
Full System Functional Testing: Perform progressive power-up sequence and complete operational testing of all electrical systems before returning to service
