CAT 078-2234 ELBOW

CAT 078-2234 is a Caterpillar genuine 90° hydraulic/fuel line elbow fitting, compatible with the hydraulic or fuel lines of various CAT excavators, loaders, and other equipment. It is used to change the direction of the pipeline and ensure a high-pressure seal, making it a key connector for changing the flow direction in fluid systems.

Core Parameters (Original Manufacturer Nominal)

Item Details
Part Model: CAT 078-2234 (0782234) 90° Elbow Fitting
Fit Type: JIC 37° External Thread × External Thread, 90° Bend, Suitable for High-Pressure Hose/Rigid Pipe Connections
Specifications: Thread Size: 1/2″-20 UNF (JIC Standard), Suitable for 16mm Outer Diameter Oil Pipe, 25mm Elbow Center Radius, 32mm End Face Spacing
Material and Process: Forged carbon steel, galvanized and passivated surface treatment, corrosion resistant ≥300 hours salt spray test; precision ground sealing surface, suitable for NBR/FKM seals
Operating Parameters: Rated Working Pressure: 35MPa (5075psi), Burst Pressure: 105MPa, Applicable Temperature: -40℃ to +120℃, Suitable for Mineral Oil/Synthetic Hydraulic Oil
Compatible with: CAT 320D, 336D Hydraulic pilot lines, return lines, or fuel lines for excavators, 950H loaders, and other equipment; Matching seals: 4T-0967, ferrules: 222-0345. Weight: Approx. 0.12kg (0.26lbs). Suitable for: Pipe reversal connections: Used for 90° reversal connections between rigid pipes and flexible hoses in hydraulic systems. Suitable for high-pressure conditions such as excavator boom and stick cylinder lines, and loader steering lines, reducing pipe interference and optimizing layout.

High-pressure sealing guarantee: JIC 37° conical seal design, combined with dedicated ferrules and seals, effectively prevents high-pressure fluid leakage, suitable for continuous high-pressure operation.

Compatibility: Requires corresponding high-pressure hoses (e.g., SAE 100R2AT), JIC ferrules, and seals. Installation torque: 18-22 N·m. Perform the procedure to ensure a reliable seal.

Installation and Maintenance Points

Installation Steps:
Clean the connector threads and sealing surface. Before installation, apply a small amount of hydraulic oil to the threads (do not use Teflon tape/sealant);
Tighten the connector to a torque of 18-22 N·m, ensuring the 37° conical surface fits snugly against the oil pipe/connector without gaps;
After installation, perform a pressure test at 1.5 times the working pressure. A pressure hold of 5 minutes without leakage indicates it is合格 (qualified).

Maintenance Cycle: Under standard operating conditions, inspect every 2000 hours, focusing on thread damage, surface corrosion, and sealing surface wear; under harsh operating conditions (high dust, high temperature), shorten to 1500 hours.

Replacement Standard: If thread stripping, scratches/dents on the sealing surface, or surface corrosion cause seal failure, the entire connector must be replaced; it cannot be repaired.