2S-4078 O-Ring Seal is a Caterpillar sealing component designed to help prevent fluid leakage and maintain reliable sealing performance in hydraulic and mechanical connections. According to Caterpillar, this O-Ring has a 37.47 mm inside diameter and 3.0 mm cross-section diameter, with an NBR nitrile rubber construction and 90A material hardness.
| Parameter | Description |
| Part Number | 2S-4078 O-Ring |
| Compatible Models | CAT D275A, D375A, D65E Bulldozers; Komatsu WA800, WA900 Loaders; HD465, HD785, HD1500, HM400 Dump Trucks |
| Seal Type | Standard O-Ring Seal |
| Material | NBR (Nitrile Rubber) and Polytetrafluoroethylene (PTFE) |
| Material Hardness | 90A |
| Inner Diameter (ID) | 37.47 mm (1.475 in) |
| Cross Section Diameter | 0.118 in (5.33 mm approx. from other data) |
| Weight | 0.01KG |
| Precision | Fully aligns with CAT OEM specifications |
| Performance | Superior elasticity, compression set resistance, high/low temperature tolerant |
| Packaging | Cartons |
| Lead Time | In-stock: 7 days; Production: Approximately 90 days |
| Warranty | 6 months, includes technical support |
The requested applications are:
Compatibility Note: Caterpillar’s current public Parts Store data does not explicitly show these three models in the compatibility list for 2S-4078. Since fitment can vary by machine configuration and serial number, we recommend confirming the machine serial number and parts diagram before ordering.
Cat’s public database does show 2S-4078 across a wide range of equipment, including various engines, trucks, graders, excavators, skidders and other heavy equipment.
The 2S-4078 O-Ring is suitable for hydraulic fittings and other mechanical joints requiring dependable sealing against fluid leakage and contamination.
The 2S-4078 O-Ring is carefully packed to help protect the rubber seal from contamination, moisture, deformation and handling damage. Standard export cartons are suitable for individual orders and consolidated machinery-parts shipments.
YLCM provides flexible international logistics solutions based on destination, order quantity and delivery requirements:
Suitable export packaging can also be arranged for larger consolidated orders.
Q1: What material is 2S-4078 made from?
A: Caterpillar specifies NBR (Nitrile) as the primary polymer/material, with 90A hardness.
Q2: What are the dimensions of 2S-4078?
A: The O-Ring has a 37.47 mm inside diameter and 3.0 mm cross-section diameter.
Q3: Can 2S-4078 be used on D275A, D375A and D65E?
A: These are the models supplied for this YLCM listing, but Cat’s current public compatibility database does not explicitly confirm them. Please provide the machine serial number for final verification.
Q4: What information should I provide when ordering?
A: Please provide the part number, machine model, serial number and required quantity so the application can be checked before shipment.
Looking for 2S-4078 O-Ring for CAT D275A, D375A or D65E?
Send us your part number, machine model, serial number and required quantity. YLCM can help verify the part information and provide a competitive quotation.
