The COGENG 3045167 (304-5167) is a premium direct OEM replacement engine wiring harness (chicote do motor) specifically engineered for Caterpillar D6N and D6K track-type tractors (bulldozers). This comprehensive engine harness connects and powers critical engine components including the Engine Control Module (ECM), fuel injectors, sensors, actuators, and charging system. Manufactured to meet or exceed original Caterpillar specifications, this durable, plug-and-play harness ensures reliable electrical performance, optimal signal integrity, and long service life in demanding earthmoving and construction applications.
Direct OEM replacement | CAT D6N / D6K compatible | Chicote do motor | Factory direct | In stock
| Parameter | Specification |
|---|---|
| COGENG Part Number | 3045167 (304-5167) |
| OEM Equivalent | Caterpillar 3045167, 304-5167 |
| Product Type | Engine Wiring Harness / Chicote do Motor |
| Application | Engine electrical system (ECM, injectors, sensors) |
| Harness Type | Complete engine bay harness |
| Compatible Models | Caterpillar D6N, D6K Track-Type Tractors (Bulldozers) |
| Brand | Part Number |
|---|---|
| COGENG | 3045167, 304-5167 |
| Caterpillar | 3045167, 304-5167 |
| Interchange | 3045168, 3045169, 3045166, 198-5056 |
Parts list
| Item | OEM Reference No. | COGENG Part No. | Description | Qty |
|---|---|---|---|---|
| 1 | 304-5167 / 3045167 | CG-304-5167 | Caterpillar Wiring Harness — Complete Assembly, Pre-Terminated, Plug-and-Play | 1 |
| 2 | — | CG-CONN-KIT-304 | Replacement Connector Kit (Main Block + Branch Connectors with Terminals) | 1 Set |
| 3 | — | CG-LOOM-HD-CAT | Heavy-Duty Replacement Protective Loom / Conduit (Per Meter) | As Required |
| 4 | — | CG-TERMINAL-CAT | Assorted Terminal Pin & Socket Kit with Weather Seals for CAT Harnesses | 1 Set |
| 5 | — | CG-CLIP-CAT-D6 | Frame Mounting Clip & Bracket Set for D6 Series Dozers | 1 Set |
| Parameter | Specification |
|---|---|
| Model | Caterpillar D6N Bulldozer |
| Series | N-Series |
| Engine | CAT C6.6 / C7.1 (depending on production year) |
| Engine Power | 105-130 kW (140-175 HP) |
| Operating Weight | 14,000 - 16,000 kg |
| Parameter | Specification |
|---|---|
| Model | Caterpillar D6K Bulldozer |
| Series | K-Series |
| Engine | CAT C4.4 / C6.6 |
| Engine Power | 90-110 kW (120-147 HP) |
| Operating Weight | 11,000 - 13,000 kg |
| Engine Model | Displacement | Cylinders | Fuel System | Found In |
|---|---|---|---|---|
| CAT C4.4 | 4.4L | 4-cylinder | Common Rail | D6K |
| CAT C6.6 | 6.6L | 6-cylinder | Common Rail | D6N, D6K |
| CAT C7.1 | 7.1L | 6-cylinder | Common Rail | D6N (later models) |
| CAT C7.1 ACERT | 7.1L | 6-cylinder | Common Rail | D6N (Tier 4) |
Note: Verify your machine's engine model and serial number before ordering. The D6N and D6K may have different engine configurations depending on production year. Contact COGENG with your machine details for exact application verification.
Compatibility Notes:
Confirmed fit for Caterpillar D6N and D6K track-type tractors (dozers).
Compatible with machines equipped with CAT C6.6 and C7.1 engines (depending on model year).
Replaces OEM part numbers: 304-5167, 3045167.
Also compatible with certain CAT excavators and loaders using same engine platform – cross-reference connector locations before ordering.
Note: Verify your machine's serial number prefix (e.g., ALP, ALT, JML, WMR, PBK, PBR, RAB, RBT). This harness is not compatible with Tier 4 Final machines with different emission sensor layouts unless explicitly confirmed.
| Parameter | Specification |
|---|---|
| System Voltage | 24V DC (Caterpillar standard) |
| Current Capacity | Up to 45A (main power circuits) |
| Wire Gauge Range | 14AWG - 20AWG (signal) / 8AWG - 12AWG (starter/alternator) |
| Insulation Resistance | ≥100MΩ @ 500V DC |
| Dielectric Strength | 1500V AC/60s No Breakdown |
| Voltage Drop | <0.5V @ rated load |
| Temperature Rating | -40°C to +125°C (engine bay rated) |
| Component | Material Specification |
|---|---|
| Conductor | High-purity tinned copper (99.9%) |
| Wire Insulation | Heat-resistant XLPE / PVC (125°C rated) |
| Outer Wrapping | Automotive-grade cloth tape / Corrugated conduit |
| Connector Housings | OEM-grade Nylon 66 / PBT (UL94 V-0) |
| Terminals | Tin-plated / Gold-plated brass |
| Grommets/Bushings | EPDM Rubber (UV resistant) |
| Shielding | Aluminum foil + copper braid (sensor circuits) |
| Identification | Heat-shrink printed circuit labels |
| Diesel-resistant jacketing | Special compound for engine bay |
| Circuit Type | Components Connected | Wire Specification | Shielding |
|---|---|---|---|
| Engine Control (ECM) | Main ECM, crank sensor, cam sensor | Shielded 18-20 AWG | Yes |
| Fuel System | Injectors (4 or 6), fuel pump, pressure sensors | 14-16 AWG + shield | On sensors |
| Air Intake | Turbo actuator, MAF sensor, boost sensor | 18-20 AWG shielded | Yes |
| Exhaust / Aftertreatment | EGR valve, DPF sensors, temp sensors | 18-20 AWG shielded | Yes |
| Cooling System | Fan motor, coolant temp sensor, fan clutch | 14-16 AWG (fan) + 20 AWG (sensor) | No |
| Charging System | Alternator, starter motor, battery connections | 8-10 AWG (alternator) / 4-6 AWG (starter) | No |
| Engine Sensors | Oil pressure, fuel temp, coolant temp, water in fuel | 18-20 AWG shielded | Yes |
| Connector Type | Location | Pins | Sealing |
|---|---|---|---|
| CAT OEM | Engine Control Module (ECM) | 48-60 pin | IP67 |
| Injector Connectors | Valve cover (4 or 6 injectors) | 2-pin each | IP67 |
| Deutsch DT | Sensors, actuators | 2-4 pins | IP67 |
| AMP/Tyco | Alternator, starter | 2-pin + ring terminal | IP65 |
| Crank/Cam Sensor | Engine block | 3-pin | IP67 |
| Coolant Temp | Thermostat housing | 2-pin | IP67 |
| Oil Pressure | Engine block | 2-pin | IP67 |
| Feature | Benefit |
|---|---|
| OEM-Grade Materials | CAT D6N/D6K spec wire, terminals, connectors |
| Model-Specific Fit | Exact routing for D6N/D6K engine bay |
| Pre-Formed Branches | Matches factory routing paths |
| Color-Coded Wires | Caterpillar-standard wire colors |
| Labeled Connectors | Circuit identification at every junction |
| 100% Tested | Every harness individually verified |
| Shielded Circuits | Critical sensor circuits fully shielded |
| High-Temp Wire | 125°C rated for engine bay |
| Diesel-Resistant | Jacketing resists diesel, oil, coolant |
| Test | Standard | Acceptance Criteria |
|---|---|---|
| Continuity Test | 100% | Zero opens, zero shorts |
| Insulation Resistance | 500V DC | ≥100MΩ |
| Dielectric Withstand | 1500V AC/60s | No breakdown |
| Voltage Drop | At rated load | <0.5V per circuit |
| Connector Insertion | OEM standard | Within spec |
| Terminal Retention | OEM standard | ≥50N |
| Shield Continuity | 100% | <1Ω |
| High-Temp Exposure | 125°C / 1000 hrs | No degradation |
Installation Decomposition Diagram (Step-by-Step Routing Guide):
Below is the logical routing sequence. [For a visual diagram, refer to the machine's service manual – this text outlines each segment's layout.]
| Segment | Component / Zone | Routing & Connection Notes |
|---|---|---|
| 1 | Engine Control Module (ECM) | Main ECM connector (70-pin or 120-pin depending on model). Lock lever must be fully seated – no bent pins. |
| 2 | Engine Harness Backbone | Routes along the engine valve cover, secured with plastic zip-tie mounts (do not overtighten). Keep away from injector fuel lines. |
| 3 | Fuel Injectors (6x) | Individual injector connectors. Label before removal – cylinder order is critical. Push until audible click. |
| 4 | Crankshaft Position Sensor | Mid-engine, flywheel housing area. Check for oil wicking. |
| 5 | Camshaft Position Sensor | Front timing cover. Route harness above, not across, gear case. |
| 6 | Intake Manifold Pressure/Temp Sensor | Intake manifold top. Connector orientation must face away from heat shield. |
| 7 | Coolant Temperature Sensor | Thermostat housing. Use dielectric grease. |
| 8 | Oil Pressure Sensor | Oil filter housing block. Torque sensor body to 20 Nm, not through harness. |
| 9 | Atmospheric Pressure Sensor | Usually mounted near ECM. Ensure vent hole not blocked. |
| 10 | Throttle Position Sensor (if used) | Fuel injection pump or pedal harness junction. Verify shield ground continuity. |
| 11 | Engine Speed/Timing Pickup | Bellhousing or front cover. Air gap non-adjustable – must seat fully. |
| 12 | Glow Plug Relay & Cold Start System | Relay coil control wires – verify heavy-gauge feed not damaged. |
| 13 | Alternator R-Terminal (RPM signal) | Small gauge wire to ECM – prone to breakage. |
| 14 | Chassis Ground Strap Point | Clean metal surface – no paint, rust, or corrosion. Required for ECM reference. |
| 15 | Main Battery Positive Feed to ECM | Fused line – never remove with battery connected. |
Final:
Reconnect battery negative cable last.
Turn key to "ON" (do not start) for 30 seconds – listen for ECM relay cycling. Check for smoke or unusual heat at connectors.
Start engine. Let idle for 3 minutes.
Perform electronic service tool check (CAT ET required): monitor live parameters for all sensors (coolant temp, oil pressure, intake pressure, engine speed). No active diagnostic codes should appear.
Wiggle test: Gently move main harness branches near ECM and injectors while engine idling – any RPM change or fault code indicates loose pin.
Re-route and re-secure any harness segment that contacts hot surfaces (exhaust manifold, EGR pipe, turbocharger heat shield). Minimum clearance: 25 mm (1 inch) from unshielded hot surfaces.
Tie-wrap all slack – no dangling loops. Use adhesive-backed mounts on clean surfaces only.
Q: What Caterpillar models use the 304-5167 wiring harness?
A: The COGENG 304-5167 (also referenced as 3045167) wiring harness is a direct OEM replacement specifically designed for Caterpillar D6N, D6K, and D6M track-type tractor (dozer) models. This harness connects critical electrical components, sensors, and control modules within the machine's electrical system. Always verify this part number against your machine's parts manual or the original harness tag to confirm exact compatibility before ordering, as harness configurations can vary by serial number range and machine options.
Q: What are the symptoms of a failing wiring harness on a Cat D6N, D6K, or D6M?
A: Common symptoms include intermittent electrical faults, multiple warning lights illuminated on the monitor panel, unresponsive implement or transmission controls, erratic gauge or sensor readings, CAN bus communication errors, specific functions not responding, or unexpected machine shutdowns. Wiring harness degradation is often caused by prolonged exposure to heat, vibration, moisture ingress, and physical wear in the demanding dozer operating environment.
Q: What material construction is used for this wiring harness?
A: The COGENG 304-5167 wiring harness is constructed with high-quality wiring materials and durable connector components designed to withstand the harsh operating conditions of track-type tractors. The assembly incorporates robust protective loom covering and is built to match the OEM routing and connection points for Cat D6N, D6K, and D6M models.
Q: Is this harness a direct plug-and-play replacement?
A: Yes, the COGENG 304-5167 harness is manufactured to exact OEM specifications for connector types, pin assignments, wire gauge, and routing length. It is a direct plug-and-play replacement requiring no wire splicing, soldering, or modifications when installed on compatible Caterpillar D6N, D6K, or D6M models.
Q: What are the ordering and shipping options?
A: COGENG accepts trial orders with no minimum order quantity requirement. Payment can be made via Western Union, L/C, T/T, MoneyGram, D/A, or D/P. Shipping options include air freight, sea freight, and international express couriers (FedEx, UPS, DHL, TNT, etc.). Products are packaged in a protective PP bag inside a durable carton box for safe transit. COGENG is ISO9001 certified and ships from Guangdong, China.
Q: What is the warranty coverage for this wiring harness?
A: COGENG provides a standard 12-month warranty against manufacturing defects from the date of installation. Proof of purchase and installation by a qualified technician are required. Warranty does not cover damage caused by improper installation, unauthorized modifications, rodent damage, or use on incompatible equipment.
Q: Does COGENG offer technical support for installation or troubleshooting?
A: Yes, COGENG provides complimentary technical support to assist with installation guidance and basic troubleshooting. For complex electrical diagnostics on Cat D6N, D6K, and D6M dozers, we recommend consulting a certified Caterpillar service technician.
Q: How is the wiring harness protected during shipping?
A: Each COGENG 304-5167 wiring harness is individually sealed in a protective PP inner bag and packed in a sturdy outer carton box to prevent connector damage and wire kinking during transit. All connectors are capped for additional protection. Factory direct shipping ensures the product reaches you in optimal condition.
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