- EN
| 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
Q: What Hitachi models use this hydraulic pump wiring harness?
A: The COGENG industrial-grade hydraulic pump wiring harness is specifically designed for Hitachi ZX200-3 and ZX240-3 excavator models, connecting the hydraulic pump control solenoids and sensors to the machine's main electrical system. Always verify the part number on your original harness tag and consult your machine's parts manual to confirm exact compatibility before ordering.
Q: What are the symptoms of a failing hydraulic pump wiring harness on a Hitachi ZX200-3 or ZX240-3?
A: Common symptoms include erratic or unresponsive hydraulic pump operation, abnormal pump control behavior, reduced hydraulic performance or slow implement response, active diagnostic trouble codes related to pump control solenoids or pressure sensors, the machine entering a failsafe or limp mode, or intermittent hydraulic power loss. The pump harness is exposed to high heat, vibration, and hydraulic fluid mist in the pump compartment, making it particularly susceptible to degradation over time.
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