OSK™ O-Ring Service Kit for CAT 4C4782 (270-1528)

OSK™ O-Ring Service Kit for CAT 4C4782 / 270-1528 | 580pcs SAE STOR & ORFS Hydraulic O-Rings – Buna-N 90

Product Description:

• Complete OSK™ Service Kit built for Caterpillar® 4C4782 (270-1528) hydraulic systems
• Contains 580 total O-Rings across 32 OEM-referenced sizes
• All O-Rings are Buna-N (Nitrile) 90 durometer, black color, engineered for high-pressure performance
• Designed for use in SAE STOR (Straight Thread O-Ring) and ORFS (O-Ring Face Seal) connections, common in Series 61 and 62 hydraulic systems
• Buna-N 90A properties:
  • Temperature Range: -40°F to +250°F (-40°C to +121°C)
  • Excellent resistance to petroleum oils, diesel, hydraulic fluids, and automatic transmission fluids
• Assembled in the USA in a rugged kit with size chart, refill list, and individual compartments
• Ideal for field mechanics, hydraulic shops, and equipment maintenance teams working on Caterpillar® machines
• Equivalent to CAT® Seal Kit 4C4782 and 270-1528 – NOT manufactured or endorsed by Caterpillar Inc.

Kit Contents – 580pcs Total / 32 Sizes (All Buna-N 90A O-Rings)

• 10pc – 4J0527
• 20pc – 4J7533
• 20pc – 7J0204
• 20pc – 3J7354
• 20pc – 1J9671
• 20pc – 3J1907
• 20pc – 4K1388
• 20pc – 4J0526
• 15pc – 4J0522
• 15pc – 4J0520
• 20pc – 4J5267
• 20pc – 2M9780
• 20pc – 7M8485
• 10pc – 4J0525
• 15pc – 4J0519
• 20pc – 4J5140
• 20pc – 3D2824
• 20pc – 2S4078
• 15pc – 4J0524
• 20pc – 6V9746
• 20pc – 5K9090
• 20pc – 6V8400
• 20pc – 8T0315
• 20pc – 6K6307
• 15pc – 4J0523
• 20pc – 4J5477
• 20pc – 6V8397
• 20pc – 6V8398
• 20pc – 7J9108
• 20pc – 3K0360
• 20pc – 304606

Why Buy from The O-Ring Store LLC?

• ISO 9001:2015 Certified Quality and full material traceability
• Family-owned, U.S.-based distributor with millions of O-Rings in stock
• Precision vulcanized O-Rings, custom kitting, barcode labeling, and packaging
• Rapid fulfillment, expert technical support, and industry-specific service
• Trusted by heavy equipment operators, repair technicians, and OEM suppliers worldwide