Caterpillar CAT 188-0128 191-9663 Fan Pump | Gear Pump for 216 226 232 242 Loaders

The 188-0128 / 191-9663 Series external gear pumps from Chengyuan Hydraulic are precision-engineered power components fully compatible with Caterpillar (CAT) industrial standards. Primarily utilized as fan drive pumps or auxiliary hydraulic pumps, these units are installed in the cooling circuits of various CAT Skid Steer Loaders (SSL) and Multi Terrain Loaders (MTL), including models 216, 226, 232, and 242. Designed for the harsh, dusty, and high-temperature environments typical of loader operations, we utilize high-strength aluminum alloy bodies and specially hardened gear sets. Every pump undergoes 100% simulated load condition testing before delivery to ensure pressure stability and flow output match OEM standards, guaranteeing 100% original-place interchangeability.

Technical Specifications:

• Core Part Numbers: 188-0128, 191-9663, 172-5503 (Compatible)

• Brand Compatibility: Caterpillar (CAT)

• Pump Type: High-Pressure External Gear Pump (Fan/Auxiliary)

• Displacement: Approx. 10 cm³/rev to 25 cm³/rev (SKU specific)

• Rated Operating Pressure: 210 bar (21 MPa)

• Peak Pressure: 250 bar (25 MPa)

• Maximum Rated Speed: 3500 rpm

• Housing Material: High-strength die-cast Aluminum Alloy

• Sealing Material: High-temperature Fluororubber (Viton/FKM)

• Rotation: R (Clockwise looking from shaft end)

Key Technical Advantages:

• Nitrided High-Hardness Gears: Gears are crafted from premium alloy steel, precision-hobbed and nitrided for extreme surface hardness and core toughness. This prevents gear scoring even with minor particulate contamination, ensuring long-term operational efficiency.

• Floating Bushing Pressure Compensation: Utilizing hydraulic feedback, the bushings automatically adjust the axial clearance against the gear faces. This design maintains volumetric efficiency above 90% even at 210 bar, significantly reducing energy loss.

• Excellent Thermal Stability & Dissipation: Engineered for the continuous duty cycles required by loader fan systems. The high-thermal-conductivity aluminum housing, combined with optimized internal flow paths, rapidly dissipates heat, preventing premature seal failure caused by overheating.

• 100% Rigorous Condition Validation: Chengyuan subjects every pump to dynamic testing that simulates the heavy-duty cycles of CAT loaders. We focus on pressure stability under instantaneous shock loads to ensure “out-of-the-box” reliability for the end-user.

Application Areas:

• CAT Skid Steer Loaders (SSL): 216, 226, 228, 232, 236, 242, 246, 248, 252, 262, etc.

• CAT Multi Terrain Loaders (MTL): 247, 257, 267, 277, 287, etc.

• Cooling System Drives: Providing hydraulic power for the engine radiator fan motor.

Expert Maintenance Tips:

• Contamination Control: Due to dusty operating environments, replace hydraulic filters every 500 hours. Maintain oil cleanliness at NAS Grade 9 to prevent hard particles from entering the gear meshing zone.

• Pre-Start Priming Procedure: When installing a new pump, prime the unit with clean hydraulic oil through the inlet/case port. Run at low speed for 3-5 minutes to purge air, preventing cavitation-induced wear.

• Inlet Line Inspection: Periodically check the suction hose for aging or collapse. Restricted suction will cause high-frequency vibration and accelerate shaft seal damage.