300-9482 367-8077 Cat 988H C18 Hydraulic Piston Pump

Product Overview

The 300-9482 / 367-8077 / 20R-3304 / 10R-0169 / 0R-0912 is a variable displacement axial piston hydraulic pump designed for the Caterpillar 988H wheel loader with C18 engine. It offers true drop-in interchangeability with original CAT units—identical mounting interfaces, ports, and dimensions—so no piping or bracket modifications are required. Every unit is 100% tested under simulated operating conditions to guarantee reliable performance under high-pressure, high-flow conditions. Featuring a precision swashplate axial piston design, flow is proportional to drive speed and displacement and can be steplessly varied. The pump delivers high volumetric efficiency, low noise, and long service life, serving as the core power component of the loader’s implement hydraulic system.

Technical Specifications 

• Model / Part Numbers: 300-9482 / 367-8077 / 20R-3304 / 10R-0169 / 0R-0912
• Compatible Machine: Caterpillar 988H Wheel Loader (C18 engine)
• Type: Axial piston variable displacement pump (swashplate design)
• System Output Flow (reference): approx. 492 L/min at 2010 rpm and 6900 kPa
• System Relief Valve Setting: approx. 31 000–35 000 kPa (310–350 bar)
• Control Type: Electronically controlled variable (Positive Flow Control related)
• Weight: approximately 50 kg (aftermarket reference)
• Mounting: OEM-matched flange and shaft end
• Compatible Fluid: Mineral hydraulic oil

Key Technical Advantages

1. Precision swashplate and rotary group: High-hardness pistons and precision valve plate deliver high volumetric efficiency with minimal internal leakage, optimizing overall system efficiency.
2. Robust bearing design for extended life: Optimized bearings support the rotating group under high speeds and continuous high-pressure operation, significantly increasing service life.
3. Low noise and excellent response: Optimized housing and rotating group reduce operating noise and pressure pulsation; electronic control enables fast and precise flow response.
4. Drop-in interchangeability and system matching: Exact dimensional and port match to original CAT units, fully compatible with the 988H Positive Flow Control hydraulic system for quick replacement.
5. High-strength materials and process: High-strength housing and wear-resistant components withstand the demanding conditions of large wheel loaders with strong contamination resistance.

Application Areas

• Implement hydraulic system of Caterpillar 988H wheel loaders
• Lift and tilt circuits on large wheel loaders
• Mining and heavy-duty material handling equipment
• Similar large construction machinery hydraulic power units

Expert Maintenance Tips

Ensure suction lines are adequately sized, as short as possible, and free of unnecessary bends; maintain inlet pressure within OEM specifications to prevent cavitation. Route the case drain line independently back to the reservoir. Fully bleed the system before first start-up and maintain oil cleanliness at NAS Class 7 or better. Monitor oil temperature and filter differential pressure regularly; use Caterpillar-recommended hydraulic oil. Verify electronic control signals are correct. For long-term storage, fill with clean oil and seal all ports to prevent internal corrosion. After replacement, perform system pressure and flow testing.