Main pump flow declining on your Caterpillar excavator? A worn 350-0666 variable displacement main pump progressively loses volumetric efficiency as rotating group clearances open, reducing all circuit flow simultaneously. RITO supplies this heavy-duty main pump assembly to restore full system flow and recover excavator work rate.
Item NO.:
350-0666Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In Stock350-0666 Hydraulic Main Pump Assembly for Caterpillar excavators. Variable displacement axial piston pump with factory-calibrated regulator. Precision rotating group, matched valve plate and pre-set power-limit regulator restore rated displacement and fast pressure response from first operation. Complete assembly ready for direct installation.
| Part Number | 350-0666 |
|---|---|
| Part Name | Hydraulic Main Pump Assembly |
| Compatible Brand | Caterpillar |
| Applicable Models | Caterpillar Excavator (350-0666 specification) |
| Application | Main variable axial piston pump for Caterpillar excavator primary hydraulic system |
| Material | Precision alloy steel rotating group and pump housing |
| Product Color | Industrial finish |
| Working Temperature | -25°C~+60°C |
| Key Function | Generates main hydraulic system flow and pressure for all Caterpillar excavator work functions |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
Power-limit regulator factory-set to Cat excavator engine torque curve, preventing engine overload while maintaining maximum hydraulic output under combined load.
New cylinder block, pistons, piston shoes and valve plate restore original volumetric efficiency, reducing fuel consumption and cycle time back to specification.
Barrel face and valve plate supplied as a matched pair to ensure immediate sealing efficiency without break-in leakage loss.
Fully assembled and tested pump ready for direct installation, eliminating the complexity and calibration requirements of component-level pump rebuild.
FAQ
Q: How do I confirm the 350-0666 pump is the cause of excavator flow loss?
A: Test combined case-drain flow from both pump sections at rated speed. Above OEM specification simultaneously confirms rotating group wear rather than control valve or relief valve faults.
Q: What should I flush before fitting the new 350-0666 pump?
A: Drain the hydraulic tank, replace all filter elements including suction strainer and return-line filter, clean tank interior, and refill with fresh hydraulic oil. Debris from the old pump will destroy the new rotating group within hours if filters are not replaced.
Q: Does the 350-0666 pump include the coupling and drive plate?
A: The 350-0666 assembly is the pump only. Inspect the existing coupling and drive plate for wear or imbalance before reuse; replace if either shows damage to prevent early bearing failure on the new pump.
Q: How to confirm 350-0666 is the correct pump for my Cat excavator?
A: Match the existing pump model plate reading 350-0666. Provide machine model and serial number to our team for cross-reference confirmation.
Q: What quality options are available?
A: We provide original, OEM and high-quality aftermarket versions with stable supply capability.
Q:Why Choose RITO?
A:Listed Factory
Stable&Reliable Quality
OEM Factory for Chinese Top Excavator Brands
Supplier to Fortune 500 Companies
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