177-7517 Cat Hydraulic Piston Pump 250Bar

Product Overview

The 177-7517 is a premium axial variable displacement piston pump assembly designed specifically for Caterpillar (Cat) H-Series motor graders, including models 140H, 160H, 14H, and 16H. Cross-referenced with OEM numbers 6E-3139, 6E-3136, and 6E-3137, this pump assembly delivers 100% direct drop-in interchangeability with original Caterpillar units. Every unit undergoes 100% full-load simulated factory testing prior to shipment to ensure exceptional volumetric efficiency, fast dynamic response, and long-term durability in rugged earthmoving applications.

Technical Specifications

• Primary Model Code: 177-7517 (Cross-reference: 6E-3139, 6E-3136, 6E-3137)

• Brand Compatibility: Caterpillar (Cat)

• Pump Design: Swashplate Axial Variable Displacement Piston Pump Assembly

• Displacement: 75 cm³/rev

• Rated Continuous Pressure: 250 bar (3625 psi)

• Peak Operating Pressure: 315 bar (4560 psi)

• Maximum Drive Speed: 2200 rpm

• Control System: Load Sensing (LS) & Pressure Compensator (PC)

• Unit Weight: Approx. 52 kg

Key Technical Advantages

• Micro-Finished Tribological Metallurgy: Cylinder block and piston shoes feature high-strength alloy steel with micro-ground nitrided surfaces, providing extreme resistance to wear and cavitation under continuous high pressure.

• Precision Load-Sensing Efficiency: Integrated high-response LS control valves automatically adjust output flow based on real-time grader blade load demand, minimizing heat dissipation and fuel consumption.

• 100% Direct Drop-in Fit: Fully standardized Caterpillar mounting flanges, shaft splines, and port interfaces match OEM specs exactly, enabling seamless plug-and-play replacement without modifications.

• 100% Simulated Factory Load Testing: Each pump is dynamically tested under maximum working pressure and rated RPM to guarantee zero external leakage and optimal volumetric performance.

Application Areas

• Caterpillar Motor Graders: Main hydraulic power source for Cat 120H, 135H, 140H, 160H, 14H, and 16H land graders.

• Heavy Construction Equipment: High-pressure hydraulic supply for heavy-duty leveling, grading, and earthmoving machinery based on the Cat platform.

Expert Maintenance Tips

Flush the main hydraulic system and replace all inline filters before installation. Use ISO VG 46/68 anti-wear hydraulic oil while maintaining fluid cleanliness to ISO 18/16/13 (NAS Class 8) or cleaner. Always pre-fill the pump cavity with fresh hydraulic oil through the highest case drain port before initial start-up to prevent dry friction damage to internal bearings and valve plates.