COGENG 117-2763 Engine Harness CAT E345B 345B

For Part Number: 117-2763 (1172763)

COGENG Engine Harness — Caterpillar E345B & 345B Excavators

Document Version: 1.0
Date of Issue: October 21, 2026
Product Category: Electrical Components / Excavator Spare Parts
Brand: COGENG
Manufacturer Reference: Caterpillar OEM Reference
Application: Engine Wiring Harness

1. PRODUCT OVERVIEW

1.1 Introduction

This document serves as the comprehensive technical specification for the engine harness identified by part number 117-2763 (also formatted as 1172763), supplied by COGENG. This part is a critical electrical component used in Caterpillar E345B and 345B excavators. The engine harness is responsible for transmitting power and signals between the Engine Control Unit (ECU), sensors, injectors, and other engine-mounted electrical components.

The purpose of this document is to provide engineers, mechanics, procurement specialists, and maintenance teams with a complete understanding of the physical specifications, compatibility, installation protocols, and maintenance requirements for this specific engine harness.

1.2 Product Description

The 117-2763 is a precision-engineered Engine Wiring Harness manufactured by COGENG as a direct replacement for the Caterpillar OEM part. This harness is a complete assembly of electrical wires, connectors, and terminals that routes power and signals throughout the engine's electrical system.

The Caterpillar 345B is a 45-ton class excavator widely used in construction, mining, quarrying, and large-scale earthmoving applications. It is equipped with the Caterpillar 3176C or C-10 diesel engine, known for its reliability and fuel efficiency. The engine harness is essential for the proper functioning of the engine's electronic control system, including fuel injection, timing, and emissions control.

The harness connects:

• Engine Control Unit (ECU): The brain of the engine management system.

• Fuel Injectors: For precise fuel delivery.

• Sensors: Including crankshaft position, camshaft position, coolant temperature, oil pressure, and boost pressure sensors.

• Actuators: Including the wastegate, EGR valve, and throttle actuator.

• Diagnostic Connector: For connecting diagnostic tools.

The harness is engineered to withstand the demanding operating conditions of construction equipment, including vibration, temperature extremes, moisture, dust, and chemical exposure. It is manufactured using high-quality copper wire, durable insulation materials, and weatherproof connectors.

Key Functional Characteristics:

• Complete Assembly: Includes all wires, connectors, and terminals required for the specific application.

• High-Quality Materials: Copper wire with durable insulation for long service life.

• Weatherproof Connectors: Sealed connectors resist moisture and contamination.

• Vibration Resistance: Designed to withstand the vibration of engine operation.

• High-Temperature Resistance: Suitable for the high-temperature environment of the engine compartment.

• OEM-Compatible: Direct replacement for Caterpillar 117-2763.

• COGENG Quality: Manufactured to meet or exceed OEM specifications.

1.3 Key Technical Features

1. Direct OEM Replacement: Designed to replace Caterpillar 117-2763 without modification.

2. Precision Manufacturing: All wires, connectors, and terminals manufactured to exacting tolerances.

3. High-Quality Copper Wire: Stranded copper wire for excellent conductivity and flexibility.

4. Durable Insulation: Cross-linked polyethylene (XLPE) or high-temperature PVC insulation for resistance to heat, oil, and abrasion.

5. Weatherproof Connectors: Sealed connectors with high-quality seals to prevent moisture ingress.

6. Color-Coded Wires: Wires are color-coded for easy identification and troubleshooting.

7. Heavy-Duty Design: Engineered for the demanding 45-ton class 345B excavator.

8. Quality Assurance: Manufactured under ISO 9001 quality management system.

2. PARTS LIST

The following list details the components included in or associated with the 117-2763 engine harness. This part is typically a complete assembly, but the following table details the main components.

2.1 Main Assembly Components

Note: The specific components and part numbers may vary slightly based on the specific production batch. Always verify with the serial number of your machine.

2.2 Related Service Components

When replacing an engine harness, the following components should be inspected and replaced if necessary:

• Fuses: Inspect for blown fuses.

• Relays: Inspect for proper operation.

• Battery: Inspect for corrosion or damage.

• Alternator: Inspect for proper charging.

• Starter: Inspect for proper operation.

• Ground Straps: Inspect for corrosion or damage.

• Electrical Connectors: Inspect for corrosion, damage, or loose pins.

• ECU: Inspect for damage or corrosion.

2.3 Material Specifications

3. COMPATIBLE MODELS

The part number 117-2763 is primarily designed for Caterpillar E345B and 345B excavators. The following compatibility information is compiled from multiple industry sources.

3.1 Primary Compatibility (Caterpillar Excavators)

This part is most commonly found on the following machine models:

• Caterpillar E345B (Excavator)

• Caterpillar E345B L (Excavator)

• Caterpillar E345B LN (Excavator)

• Caterpillar 345B (Excavator)

• Caterpillar 345B L (Excavator)

• Caterpillar 345B LN (Excavator)

• Caterpillar 345B MH (Material Handler)

3.2 Additional Compatibility (Caterpillar Excavators)

Based on cross-reference data, the 117-2763 may also be compatible with:

• Caterpillar 345B Series II (Excavator) — Verification required

• Caterpillar 345C (Excavator) — Verification required

• Caterpillar 345D (Excavator) — Verification required

3.3 Engine Compatibility

The 117-2763 is designed for the engines used in the E345B and 345B excavators:

• Caterpillar 3176C (Diesel Engine)

• Caterpillar C-10 (Diesel Engine)

3.4 Cross-Reference Numbers

When searching for this part, you may encounter the following interchangeable or superseded part numbers. If you cannot find 117-2763, check for these:

• 117-2762

• 117-2764

• 117-2765

• 117-2766

• 117-2767

• 117-2768

• 117-2769

• 117-2770

• 117-2771

Warning: While these numbers are often interchangeable, the specific suffix number usually denotes a specific revision or application. Always confirm the exact harness specifications before ordering.

3.5 Related Part Numbers

The following part numbers are related to the 117-2763 and may be used in the same electrical system:

• 117-2762 (Chassis Harness)

• 117-2764 (Cab Harness)

• 117-2765 (Front Harness)

4. INSTALLATION PRECAUTIONS

Installing an engine harness is a precision operation. Failure to follow these precautions can result in immediate damage to the harness, electrical system damage, or personal injury.

4.1 Pre-Installation Checklist

1. Verify Part Number: Ensure the new engine harness matches the old harness exactly. Check the connector types, wire colors, and routing.

2. Cleanliness: The electrical system is sensitive to contamination. Clean the area around the harness before removal.

3. Battery Disconnect: Disconnect the battery before beginning work to prevent electrical shock or short circuits.

4. Inspect Mating Parts: Check the ECU, injectors, sensors, and other electrical components for corrosion, damage, or loose pins.

5. Check Fuses: Inspect all fuses and relays for damage or corrosion.

6. Safety First: Ensure the engine is off, cool, and the battery is disconnected before beginning work.

4.2 Installation Procedure

1. Disassembly: Carefully disconnect the old engine harness from all components. Label connectors if necessary to aid in reinstallation. Remove the old harness from the engine.

2. Cleaning: Thoroughly clean the routing area and all electrical connectors. Remove any debris, oil, or corrosion.

3. Inspection: Inspect all electrical components for wear, cracks, or damage. Replace any damaged components.

4. Harness Routing: Route the new engine harness along the same path as the old harness. Secure with clips and ties as required. Avoid routing near hot surfaces or sharp edges.

5. Connector Installation: Connect all connectors to their respective components. Ensure they click into place and are secure.

6. Ground Connections: Connect all ground straps and wires to the engine block and chassis. Ensure clean, tight connections.

7. Battery Connection: Reconnect the battery. Verify correct polarity.

4.3 Pre-Startup and Testing

This is the most critical step.

1. Visual Inspection: Inspect all connections for security and correct routing.

2. Electrical Test:

   • Turn the ignition on (engine off).

   • Verify that all electrical functions operate correctly.

   • Check for any error codes on the diagnostic connector.

3. Functional Test:

   • Start the engine.

   • Verify that the engine starts and runs smoothly.

   • Check for any misfires, rough idle, or performance issues.

4. Check for Shorts: Inspect for any signs of overheating, smoke, or burning smells.

5. Final Check: Verify all systems are operating correctly. Clear any error codes and verify they do not return.

4.4 Safety Warnings

• Electrical Hazard: Disconnect the battery before working on the electrical system.

• Short Circuit Hazard: Ensure all connections are correct before reconnecting the battery.

• Fire Hazard: Keep sparks and flames away from the battery and electrical components.

• Pinch Points: Keep hands and fingers away from moving parts during installation.

• Hot Surfaces: Allow the engine and exhaust components to cool before servicing.

• Personal Protective Equipment: Wear safety glasses and insulated gloves when working on the electrical system.

• High Voltage: The engine harness may carry high voltage to the injectors. Do not touch exposed wires while the engine is running.

5. COMPATIBLE EXCAVATORS

This section provides a detailed breakdown of the excavators compatible with the 117-2763, including specific model years and regional variations.

5.1 Caterpillar E345B Excavators (Primary Application)

The 117-2763 engine harness is commonly used in Caterpillar E345B excavators equipped with the 3176C or C-10 engine. These machines are 45-ton class excavators used in construction, mining, quarrying, and large-scale earthmoving.

• Caterpillar E345B: Produced in the late 1990s to early 2000s. This model is known for its reliability and performance. The 117-2763 is a direct fit for the engine harness.

• Caterpillar E345B L: The long-undercarriage version of the E345B. The harness is identical.

• Caterpillar E345B LN: The narrow-undercarriage version of the E345B. The harness is identical.

5.2 Caterpillar 345B Excavators (Primary Application)

• Caterpillar 345B: The standard model designation. The 117-2763 is a direct fit.

• Caterpillar 345B L: The long-undercarriage version. The harness is identical.

• Caterpillar 345B LN: The narrow-undercarriage version. The harness is identical.

• Caterpillar 345B MH: Material handler version. The harness is compatible.

5.3 Caterpillar 345B Series II Excavators (Potential Fit)

• Caterpillar 345B Series II: An updated version of the 345B. The 117-2763 may be compatible. Verification required.

5.4 Caterpillar C/D-Series Excavators (Potential Fit)

• Caterpillar 345C: While the C-Series is a newer generation, some early production units may share components with the B-Series. Always verify by serial number.

• Caterpillar 345D: Verification required.

5.5 Verification Guide

To ensure compatibility with your specific machine:

1. Locate the Serial Number: Find the machine's serial number plate (usually in the cab).

2. Check the Parts Manual: Consult the official Caterpillar parts manual for your specific serial number range.

3. Visual Inspection: Compare the old engine harness with the new harness. Check the connector types, wire colors, and routing.

4. Check the Engine Model: Verify that your machine is equipped with the correct engine (3176C or C-10).

5. Cross-Reference the Part Number: Use the Caterpillar parts catalog to confirm the 117-2763 is the correct part for your machine.

6. FREQUENTLY ASKED QUESTIONS (FAQ)

Q1: What is the part number 117-2763 exactly?
A: The 117-2763 is an Engine Wiring Harness manufactured by COGENG for Caterpillar E345B and 345B excavators. It is a complete assembly of electrical wires, connectors, and terminals that routes power and signals throughout the engine's electrical system.

Q2: What does an engine harness do?
A: An engine harness is the central nervous system of the engine's electrical system. It transmits power and signals between the ECU, injectors, sensors, and actuators, enabling the engine to operate efficiently and meet emissions standards.

Q3: What are the symptoms of a bad engine harness?
A: Symptoms of a bad engine harness include:

• Engine misfires: Rough running or hesitation.

• No start: The engine cranks but does not start.

• Error codes: The machine's computer may display fault codes.

• Poor performance: Loss of power or fuel efficiency.

• Intermittent operation: Functions that work sometimes and not others.

• Overheating: Wires or connectors may become hot.

• Burning smell: Insulation may be burning.

• Corrosion: Visible corrosion on connectors or terminals.

Q4: Is this a direct replacement for the original Caterpillar part?
A: Yes, the 117-2763 is designed as a direct replacement for the Caterpillar OEM part.

Q5: What is the warranty period for this part?
A: Standard warranty for these electrical components is typically 6 to 12 months, depending on the supplier. However, warranty is void if the unit is damaged during installation, if the system was not properly connected, or if the wrong voltage was applied.

Q6: Can I use this engine harness on a different brand of excavator?
A: It is not recommended unless you are a qualified electrical engineer. While the harness might physically fit, the connector types and wire routing may not match the host machine's system, leading to poor performance or failure.

Q7: What type of electrical system does this harness support?
A: The 117-2763 supports a 24V DC electrical system, which is standard for the Caterpillar E345B and 345B excavators.

Q8: Do I need to replace any other components when installing a new engine harness?
A: It is recommended to inspect and replace any damaged fuses, relays, connectors, or ground straps. If the old harness failed due to a short circuit, the affected components should also be inspected and replaced.

Q9: What is the typical lead time for this part?
A: Lead times vary. Standard stock items may ship within 24-48 hours. Custom or non-stock items may take 15-30 days for manufacturing or sourcing.

Q10: How do I identify if I have a genuine OEM part or an aftermarket replacement?
A: Genuine OEM parts will have the Caterpillar logo and part number cast or stamped into the connectors or wire tags. COGENG parts are aftermarket replacements manufactured to meet or exceed OEM specifications. Always source from a trusted supplier.

Q11: What is the difference between 117-2763 and other 117-27 numbers?
A: The base number "117-27" indicates the series. The suffix (e.g., -63) indicates the specific revision, configuration, or application. Always match the complete part number.

Q12: Can I rebuild the engine harness instead of replacing it?
A: In some cases, individual wires or connectors can be repaired or replaced. However, if the harness is extensively damaged, replacement is the most reliable option. Rebuilding a harness requires specialized tools, connectors, and technical expertise.

Q13: How do I test an engine harness?
A: To test an engine harness:

1. Visual Inspection: Check for physical damage, corrosion, or loose connectors.

2. Continuity Test: Use a multimeter to check for continuity between connectors.

3. Voltage Test: Use a multimeter to check for voltage at various points in the circuit.

4. Resistance Test: Check for excessive resistance in wires and connections.

5. Diagnostic Scan: Use a diagnostic tool to check for error codes.

Q14: What causes engine harness failure?
A: Engine harness failure can be caused by:

• Vibration: Constant vibration can cause wires to break or connectors to loosen.

• Heat: Excessive heat can cause insulation to crack or melt.

• Moisture: Water ingress can cause corrosion and short circuits.

• Abrasion: Rubbing against metal components can wear through insulation.

• Rodent damage: Mice or rats can chew through wires.

• Improper installation: Incorrect routing or connection can cause damage.

Q15: Can I install this engine harness myself?
A: Yes, if you have electrical experience and the proper tools. However, engine electrical systems are complex and can be dangerous. If you are unsure, consult a qualified mechanic or electrician.

7. TECHNICAL SPECIFICATIONS SUMMARY

8. 🚚 SHIPPING DETAILS & RETURN POLICY

8.1 Shipping Details

We offer worldwide shipping for all our electrical components and spare parts. Our shipping partners include DHL, FedEx, UPS, and EMS to ensure fast and reliable delivery.

• Shipping Methods:

  • Express Shipping: 3-7 business days for urgent orders.

  • Standard Shipping: 7-15 business days for regular orders.

  • Economy Shipping: 15-30 business days for bulk orders.

• Shipping Costs:

  • Shipping costs are calculated based on the weight, dimensions, and destination of the package.

  • For bulk orders, please contact us for a customized shipping quote.

• Packaging:

  • All parts are carefully packaged in protective materials to prevent damage during transit.

  • Each package is labeled with the part number and quantity for easy identification.

• Tracking:

  • Once your order is shipped, you will receive a tracking number via email.

  • You can track your order on the carrier's website.

8.2 Return Policy

We are committed to ensuring your satisfaction with our products. If you are not completely satisfied with your purchase, we offer a hassle-free return policy.

• Return Eligibility:

  • Returns are accepted within 30 days of delivery.

  • The item must be unused, in its original packaging, and in the same condition as received.

  • A valid proof of purchase (order number or receipt) is required.

• Non-Returnable Items:

  • Custom-made or special-order parts.

  • Parts that have been installed or used.

  • Parts that have been damaged due to improper installation or handling.

• Return Process:

  1. Contact our customer service team to request a return authorization (RA) number.

  2. Pack the item securely in its original packaging.

  3. Ship the item back to the address provided by our customer service team.

  4. Once we receive and inspect the item, we will process your refund or exchange.

• Refunds:

  • Refunds will be processed within 5-7 business days after we receive the returned item.

  • Refunds will be issued to the original payment method.

  • Shipping costs are non-refundable unless the return is due to our error.

• Exchanges:

  • If you need to exchange an item, please contact our customer service team.

  • Exchanges are subject to product availability.

9. 📞 CONTACT & ORDERING

For orders, inquiries, or technical support, please contact us using the following details:

9.1 How to Order

1. Identify Your Part Number: Use your machine's parts manual or contact us for assistance.

2. Request a Quote: Send us an email or WhatsApp message with the part number and quantity.

3. Confirm Your Order: We will provide a proforma invoice for your confirmation.

4. Make Payment: We accept T/T, Western Union, and other payment methods.

5. Receive Your Order: We will ship your order promptly and provide tracking information.

9.2 Customer Support

Our team of experienced professionals is available to assist you with:

• Part identification and compatibility verification.

• Technical support and installation guidance.

• Shipping and logistics inquiries.

• Warranty and return requests.

Business Hours: Monday to Saturday, 9:00 AM – 6:00 PM (GMT+8)

End of Document

Disclaimer: This document is for informational purposes only. The manufacturer reserves the right to change specifications without notice. Always consult the official service manual for your specific machine before performing any repairs. Part numbers and compatibility are based on industry cross-reference data and may vary by region and production year. COGENG is an aftermarket supplier and is not affiliated with Caterpillar.

*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.

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