Product Name: O-Ring (75.92 mm ID × 1.78 mm CS) – Part No. OR0759017/151 (4100705)

Description:
This component is a precision O-ring with an inner diameter (ID) of 75.92 mm and a cross-section (CS) of 1.78 mm, manufactured to the industry-standard metric size 75.92 x 1.78. It is a high-performance elastomeric sealing ring specifically designed for high-pressure waterjet cutting systems, particularly for BFT brand intensifier pump assemblies. The O-ring functions as a static or dynamic seal between mating metal surfaces, preventing high-pressure water or hydraulic fluid from leaking past critical interfaces. It is a critical consumable component in the high-pressure sealing stack and is typically located within the high-pressure cylinder or hydraulic end assembly.

Applications:

• Seals the interface between high-pressure cylinder components in waterjet intensifier pumps

• Prevents water leakage and hydraulic oil contamination (oil-water mixing) which can cause system failure

• Part of the sealing stack within BFT intensifier assemblies (compatible with CP022001/2 series)

• Suitable for high-pressure applications requiring reliable sealing under extreme pressure cycling up to 60,000–94,000 PSI (approximately 4,137–6,480 bar)

Features:

• Precision Dimensions: 75.92 mm inner diameter × 1.78 mm cross-section, manufactured to exact tolerances for proper fit in designated seal grooves

• High-Pressure Compatibility: Engineered to withstand the extreme pressures and pressure cycling inherent in waterjet intensifier operation

• Critical Sealing Component: Designed as a consumable wear part that requires periodic replacement to maintain system integrity

• Direct OEM Replacement: Interchangeable with BFT part number OR0759017/151 and cross-referenced with manufacturer part number 4100705

• Leak Prevention: When properly installed, provides a reliable barrier against water leakage; failure can lead to "oil-water mixing" or visible external leakage

Maintenance:

Failure Diagnosis (When to Replace):

• External Water Leakage: Visible water weeping from the high-pressure cylinder area is a primary indicator of O-ring failure requiring immediate replacement

• Oil-Water Mixing: Milky or discolored hydraulic oil indicates seal failure allowing water intrusion past the O-ring

• Pressure Drop: Inability to maintain rated cutting pressure may indicate seal degradation or extrusion

• Visible Damage During Inspection: When the pump is disassembled, inspect the O-ring for nicks, cuts, flattening (compression set), hardening, cracking, or deformation. Any visible damage warrants immediate replacement

• Scheduled Preventive Maintenance: It is standard practice to replace O-rings during scheduled pump overhauls or whenever the high-pressure seal stack is serviced

Inspection and Replacement Guidelines:

• Full Depressurization (Critical): Before any maintenance, fully depressurize the waterjet system (high-pressure water, hydraulic system, and air supply) and follow lockout/tagout procedures

• Single-Use Component: Always replace the O-ring with a new one whenever the associated assembly is disassembled. Do not reuse old O-rings

• Clean Installation: Perform the rebuild in a designated clean area. Thoroughly clean the seal groove and all mating surfaces with a soft, lint-free cloth. Remove all debris, old seal residue, and mineral deposits

• Groove Inspection: Inspect the seal groove for nicks, burrs, sharp edges, or damage that could cut or abrade the new seal

• Lubrication: Apply a thin, uniform layer of manufacturer-recommended high-pressure grease to the O-ring during installation to prevent pinching, rolling, or tearing during assembly

• Seating Verification: Ensure the O-ring is not twisted and is fully seated in its groove before reassembling mating components

• Torque Compliance: When reassembling the cylinder components, tighten all retaining hardware to the specific torque values listed in the equipment service manual to ensure proper O-ring compression without over-compression or damage

• Replace as a Set: When servicing the high-pressure sealing stack, it is recommended to replace all O-rings, backup rings, and dynamic seals simultaneously using a complete repair kit

• Storage: Store spare O-rings in a cool, dry environment (15–25°C, humidity <65%) away from direct sunlight, ozone sources, and chemicals to prevent premature aging

Cross-Reference Information:

• BFT #: OR0759017/151

• Manufacturer #: 4100705

• Also known as: O-Ring 75.92x1.78, High-Pressure Seal Ring

• Compatible with BFT intensifier assemblies CP022001/2 and HT022012/172

• Rated Pressure: 60,000–94,000 PSI (4,137–6,480 bar)