The hydraulic fan pump drives the cooling fan in heavy equipment. For Caterpillar excavators, the 295-9426 piston pump GP (also referenced as 2959426) is an axial piston pump. It powers the hydraulic fan motor. Therefore, this component is critical for engine and hydraulic oil cooling. A failing fan pump can cause overheating. It can also lead to reduced performance and costly downtime. This OEM-grade hydraulic fan pump GP restores proper cooling system function. As a result, your CAT excavator works reliably in hot and demanding conditions.
What Is a Hydraulic Fan Pump?
A hydraulic fan pump converts mechanical power into hydraulic flow. This flow drives the fan motor. The fan motor then spins the cooling fan. Consequently, air passes through the radiator and oil cooler. The 295-9426 is an axial piston pump. It uses pistons moving in a cylinder block to generate flow. Piston pumps are known for high efficiency. They can also generate very high pressures. For example, rated pressure is typically 20 to 25 MPa (2900 to 3625 PSI). Peak pressure can reach 30 to 35 MPa (4350 to 5075 PSI) for short periods.
This pump is part of an on-demand fan system. The Engine Control Module (ECM) monitors coolant and hydraulic oil temperatures. Then it sends a signal to a fan control valve. This valve adjusts pump output. Hence, the fan only runs as fast as needed. This saves fuel and reduces noise. It also extends fan motor life.
Engineered for CAT Excavator Models
The 295-9426 piston pump GP is specifically designed for Caterpillar 345D and 349D series excavators. It may also be used on some 3512 applications. Below is a detailed compatibility list:
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345D Series: 345D, 345D L, 345D LVG, 345DL, 345DOEM
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349D Series: 349D, 349D L, 349D2, 349D2L, 349D2 OEM, 349DL, 349DLVG, 349DOEM
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Additional Models: 345DLVG, 349D2OEM, 349D2L
This pump assembly is also cross-compatible with C13 and C-13 engines used in these excavator models. The part has multiple cross-reference numbers. For example, 20R-0095, 20R0095, and R986110034 are all equivalents. Always verify fitment with your machine serial number before ordering.
Why Choose This 295-9426 Piston Pump GP?
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Axial piston design for high efficiency. This pump type delivers consistent flow under high pressure. It maintains volumetric efficiency above 90%. Therefore, more engine power is converted into useful hydraulic work.
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On-demand fan speed control. The pump works with the ECM and fan control valve. It only provides maximum flow when cooling is needed. As a result, fuel consumption is reduced. Noise levels are also lower during light load operations.
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Durable construction for harsh environments. The pump uses high-strength alloy steel components. Pistons are hardened to resist wear. Seals are made from high-quality materials to prevent leakage. Consequently, this pump withstands dust, vibration, and temperature extremes.
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Direct fit without modifications. Mounting flanges and port locations match OEM specifications. For example, physical dimensions are approximately 9.80 x 9.80 x 12.70 inches (249 x 249 x 323 mm). Weight is approximately 42 kg (93 lbs).
Technical Specifications
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Pump Type: Axial piston pump (variable displacement)
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Part Numbers: 295-9426, 2959426, 20R-0095, 20R0095, R986110034
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Rated Pressure: 20-25 MPa (2900-3625 PSI)
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Maximum Peak Pressure: 30-35 MPa (4350-5075 PSI)
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Rated Speed: 1500-2000 RPM
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Mounting: SAE flange with 2-bolt pattern
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Seal Material: FKM (Viton) for high-temperature resistance
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Applicable Fluid: Hydraulic oil, ISO VG 46 or CAT specified
Signs Your Fan Pump Needs Replacement
Watch for these common failure indicators:
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Engine or hydraulic oil overheating. The fan may not spin fast enough. This occurs even when temperatures are high.
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Fan runs at full speed constantly. The pump may be stuck in maximum displacement mode. This wastes fuel and increases noise.
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Unusual noise from the pump area. Whining, grinding, or knocking sounds indicate internal wear. Metal particles may be circulating in the hydraulic system.
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Hydraulic oil leaks from the pump housing. Seal failure can cause external leakage. This leads to low oil levels and pump damage.
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Fan speed is inconsistent or intermittent. The pump may have internal damage. Alternatively, the control valve or ECM may be faulty.
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Diagnostic trouble codes related to fan speed. The ECM monitors fan speed via a sensor. Incorrect pump output can trigger codes.
Installation Recommendations
Follow these steps for proper installation. First, release hydraulic tank pressure and disconnect the battery. Second, label all hydraulic hoses connected to the fan pump. This prevents incorrect reconnection.
Clean the pump mounting area thoroughly. Then, remove the old pump. Inspect the drive coupling for wear. Replace it if damaged. Install the new 295-9426 piston pump GP with fresh O-rings. Never reuse old seals.
Tighten mounting bolts to CAT specifications. Typically, use 40-60 Nm for M10 bolts. Refill hydraulic fluid to the correct level. Finally, bleed air from the fan circuit. Start the engine at low idle. Check for leaks and verify fan speed control.
Conclusion
The 295-9426 (2959426) piston pump GP for CAT excavator 345D, 349D, and 3512 is a high-quality hydraulic fan pump assembly. It ensures proper cooling for your engine and hydraulic system. Whether you maintain a 345D L or a 349D2, this direct replacement pump restores on-demand fan control. Consequently, your excavator runs cooler, quieter, and more efficiently.
Order your 295-9426 hydraulic fan pump GP today. Keep your CAT excavator performing in the toughest conditions.
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