Document Version: 1.0
Date of Issue: November 05, 2026
Product Category: Electrical Components / Speed & Position Sensor
Brand: COGENG
Manufacturer Reference: Caterpillar OEM Reference
Application: Transmission Gear Position / Speed Sensing
This document serves as the comprehensive technical specification for the magnetic speed sensor identified by part number 338-1462 (also formatted as 3381462), supplied by COGENG. This part is a critical electronic sensing component used in a wide range of Caterpillar heavy equipment, including off-highway trucks, wheel tractor-scrapers, and articulated trucks.
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 sensor.
The 338-1462 is a precision-engineered Hall Effect Position/Speed Sensor designed as a replacement for the Caterpillar OEM part. In Caterpillar terminology, this unit is described as a "Gear Position Sensor" or "Position Sensor" that utilizes the Hall Effect to accurately detect gear speed position, enabling smooth shifting .
This sensor is essential for the proper functioning of the machine's transmission control system. It provides critical feedback to the ECM (Electronic Control Module) regarding gear position and speed, allowing the system to execute precise shifts and maintain optimal drivetrain performance. A malfunctioning sensor can lead to erratic shifting, incorrect system responses, or activation of safety interlocks .
The sensor is engineered to withstand the demanding operating conditions of heavy equipment, including vibration, temperature extremes, moisture, and contamination.
Key Functional Characteristics:
Hall Effect Technology: Provides accurate, non-contact position and speed detection.
4-Pin Connector: Standard Caterpillar connector configuration .
Transmission Application: Specifically designed for gear position and speed sensing in transmissions .
Heavy-Duty Construction: Built to withstand severe vibration and environmental conditions.
COGENG Quality: Manufactured to meet or exceed OEM specifications.
ISO 9001 Certified: Manufactured under a certified quality management system.
Direct OEM Replacement: Designed to replace Caterpillar 338-1462, 120-9288, and 216-0280 .
Hall Effect Sensing: Accurate detection of magnetic targets for position and speed.
18-32 V DC Operation: Compatible with 24V heavy equipment electrical systems.
4-Pin Connector: Standard interface for Caterpillar wiring harnesses.
Transmission-Specific Design: Optimized for gear position and speed feedback.
Durable Construction: Resistant to vibration, oil, and temperature extremes.
Easy Installation: Direct fit for the specified applications.
Quality Assurance: Manufactured under ISO 9001 quality management system.
The following list details the components included in or associated with the 338-1462 sensor. This part is typically a complete assembly.
| Item No. | Part Number | Description | Quantity | Material |
|---|---|---|---|---|
| 1 | 338-1462 | Magnetic Speed Sensor Assembly | 1 | Iron / Rubber / Electronic |
| 2 | 338-1462-H | Housing | 1 | Iron / Metal |
| 3 | 338-1462-C | Connector (4-Pin) | 1 | Plastic / Metal |
| 4 | 338-1462-S | Seal / O-Ring | 1 | Rubber |
| 5 | 338-1462-M | Mounting Hardware | 1 | Steel |
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.
When replacing a speed sensor, the following components should be inspected and replaced if necessary:
Wiring Harness: Inspect the connector for corrosion, damage, or loose pins.
Ground Connections: Ensure clean, tight grounds.
Transmission Fluid: Check level and condition.
Target Gear / Tone Ring: Inspect for damage or debris.
The part number 338-1462 is designed for a wide range of Caterpillar heavy equipment. The following compatibility information is compiled from multiple industry sources.
This sensor is commonly found on the following machine models :
769C
769D
773B
773D
773E
775B
775E
777D
785D
789C
789D
793B
793C
793D
Based on cross-reference data, the 338-1462 may also be compatible with :
Wheel Tractor-Scrapers: 621G, 623G, 627G, 631G, 637G, 657E, 657G
Articulated Trucks: 735, 740, AD45B, AD55, D250E, D300E, D350E, D400E
Other Trucks: 770, 771C, 771D, 772, 776C, 776D, 777C, 784B, 784C, 785B, 785C, 789B
When searching for this part, you may encounter the following interchangeable or superseded part numbers :
338-1462 (Primary part number for this document)
3381462 (Alternate format)
120-9288
1209288
216-0280
2160280
20R-7465 (Remanufactured version)
Warning: While these numbers are often interchangeable, the specific suffix number may denote a specific revision or remanufactured status. Always confirm the exact part number before ordering.
Installing a speed sensor is a precision operation. Failure to follow these precautions can result in immediate damage to the sensor, electrical system damage, or personal injury.
Verify Part Number: Ensure the new sensor matches the old unit exactly. Check the connector type and part number.
Cleanliness: The transmission area and sensor mounting location must be clean. Clean the area before removal to prevent debris from entering the transmission.
Battery Disconnect: Disconnect the battery before beginning work to prevent electrical shock or short circuits .
Inspect Mating Parts: Check the wiring harness connector for corrosion, damage, or loose pins. Inspect the target gear or tone ring for damage.
Safety First: Ensure the machine is parked on level ground, the engine is off, and the transmission is in neutral. Lower all attachments.
Disassembly: Carefully disconnect the old sensor from the wiring harness and remove it from the transmission housing.
Cleaning: Thoroughly clean the mounting area and the sensor bore. Remove any debris, oil, or metal particles.
Inspection: Inspect the target gear or tone ring for damage or excessive wear. Replace if necessary.
Seal Installation: Install a new O-ring or seal on the new sensor if applicable. Lubricate with clean transmission fluid.
Sensor Installation: Carefully insert the new sensor into the transmission housing. Ensure it seats fully and is aligned correctly with the target .
Connector Installation: Connect the 4-pin electrical connector. Ensure it clicks into place and is secure. Apply dielectric grease to the connector pins to prevent corrosion .
Battery Connection: Reconnect the battery. Verify correct polarity.
Visual Inspection: Inspect all connections for security and correct routing.
Electrical Test: Turn the ignition on (engine off). Check for any diagnostic codes related to the transmission speed sensor.
Functional Test: Start the engine and operate the machine through the gears. Verify that shifting is smooth and that no fault codes appear.
Check for Leaks: Inspect the sensor mounting area for transmission fluid leaks.
Final Check: Clear any logged codes and verify they do not return.
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 transmission and engine to cool before servicing.
Personal Protective Equipment: Wear safety glasses and insulated gloves when working on the electrical system.
This section provides a detailed breakdown of the equipment compatible with the 338-1462.
The 338-1462 sensor is widely used in Caterpillar Off-Highway Trucks, including the 769C, 769D, 773B, 773D, 773E, 775B, 775E, 777D, 785D, 789C, 789D, 793B, 793C, and 793D models . These machines are used in mining, quarrying, and large-scale earthmoving.
Compatible with 621G, 623G, 627G, 631G, 637G, 657E, and 657G Wheel Tractor-Scrapers .
Compatible with AD45B, AD55, D250E, D300E, D350E, and D400E Articulated Trucks .
To ensure compatibility with your specific machine:
Locate the Serial Number: Find the machine's serial number plate.
Check the Parts Manual: Consult the official Caterpillar parts manual for your specific serial number range.
Cross-Reference the Part Number: Use the Caterpillar parts catalog to confirm the 338-1462 is the correct part for your machine.
Q1: What is the part number 338-1462 exactly?
A: The 338-1462 is a Hall Effect Position/Speed Sensor used in Caterpillar heavy equipment. It is described as a Gear Position Sensor that detects transmission gear speed position for smooth shifting .
Q2: What are the specifications of this sensor?
A: Key specifications include: Voltage range 18-32 V DC, current draw 250 mA, 4-pin connector, Hall Effect sensing type, and approximate dimensions of 134.8 mm length x 88.9 mm width x 50.8 mm height .
Q3: What machines is this sensor compatible with?
A: It is compatible with a wide range of Caterpillar equipment, including 769C, 769D, 773B, 773D, 773E, 775B, 775E, 777D, 785D, 789C, 789D, 793B, 793C, 793D, and many others .
Q4: What are the symptoms of a bad speed sensor?
A: Symptoms include erratic or incorrect feedback regarding gear position, unintended machine actions, refusal to operate due to safety interlocks, rough shifting, and transmission fault codes .
Q5: What is the warranty period for this part?
A: Standard warranty for COGENG electrical components is typically 6 to 12 months, depending on the supplier. 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: What materials is this sensor made of?
A: The sensor is constructed with an iron/metal housing and rubber seals for reliable performance in demanding conditions.
Q7: Do I need to replace any other components when installing a new sensor?
A: It is recommended to inspect and replace the O-ring/seal, check the wiring harness connector for corrosion, and verify the target gear for damage. Apply dielectric grease to the connector pins during installation .
Q8: 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. COGENG maintains a supply capacity of up to 500 PCS.
Q9: 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. COGENG parts are aftermarket replacements manufactured to meet or exceed OEM specifications. Always source from a trusted supplier.
Q10: Can I use this sensor on a different brand of equipment?
A: It is not recommended unless you are a qualified electrical engineer. While the sensor might physically fit, the electrical characteristics and signal output may not match the host machine's system.
Q11: What is the difference between 338-1462 and 20R-7465?
A: The 20R-7465 is typically a remanufactured version of the 338-1462 . The 338-1462 is the original part number. Both are functionally equivalent.
Q12: How do I test a speed sensor?
A: To test the sensor:
Visual Inspection: Check for physical damage, corrosion, or loose connectors.
Resistance Test: Check the resistance between pins (consult service manual for specifications).
Voltage Test: Check for supply voltage at the connector.
Signal Test: Use an oscilloscope to check for a square wave signal while rotating the target gear.
Q13: What causes speed sensor failure?
A: Sensor failure can be caused by:
Contamination: Metal debris or dirt on the sensor tip.
Vibration: Constant vibration can cause internal damage.
Heat: Excessive heat can damage electronic components.
Moisture: Water ingress can cause corrosion.
Wiring damage: Broken or chafed wires.
Q14: Can I install this sensor myself?
A: Yes, if you have mechanical and electrical experience and the proper tools. However, heavy equipment systems are complex and can be dangerous. If you are unsure, consult a qualified mechanic.
We offer worldwide shipping for all our electrical components and spare parts. Our shipping partners include DHL, FedEx, UPS, TNT, 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.
By Air or Sea: Available 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 PP bags inside and carton boxes outside 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.
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:
Contact our customer service team to request a return authorization (RA) number.
Pack the item securely in its original packaging.
Ship the item back to the address provided by our customer service team.
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.
*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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