358-5004/397-3941 Hydraulic Pump for Caterpillar CAT307D/CAT307E excavator

product parameters

Part No：358-5004 / 397-3941
Type：Variable Displacement Axial Piston Hydraulic Main Pump
Applicable Equipment：CAT307D, CAT307E Excavator
Material：High strength alloy cast iron housing, alloy steel piston & slipper assembly
Surface Treatment：Anti-rust coating, internal cavity flushing & cleaning
Control Mode：Load sensing variable control
Feature：High efficiency, low internal leakage, stable pressure output, low noise, strong anti-shock capacity
Working Temperature：-20℃ ~ +110℃
Max working pressure：32MPa
Displacement：Variable displacement
Package：Independent anti-rust packing + Standard export carton
Storage suggestion：Keep dry, avoid moisture, rust and collision, indoor constant temperature storage, stay away from corrosive gas

• High-strength alloy cast iron housing. Precision casting plus stress relief annealing treatment. Excellent structural rigidity and shock resistance. It reliably withstands fluctuating hydraulic pressure and cyclic load impact during excavator operation. It is not prone to deformation under continuous heavy-duty working conditions and maintains stable pressure output.
• Precision ground internal friction pairs. Pistons, slippers and valve plate are processed to tight tolerance. It achieves higher volumetric efficiency and lower internal leakage. Fast response to load change, automatically adjusting flow to match digging, lifting and travel demand.
• Strong adaptability to harsh construction environments. Outer surface is coated with anti-rust protective layer. It can resist dust, mud, temperature fluctuation and continuous vibration on job sites, reducing risks of abrasion, cavitation and premature wear during long service cycles.
• Protect the whole hydraulic circuit. Stable pressure & flow output ensures smooth operation of boom, arm and bucket. Prevent system pressure surge, protect hydraulic cylinder, control valve and pipeline, cutting down secondary damage of hydraulic related parts.
• Direct replacement with good cost performance. All mounting dimensions, port layout and spline specs fully match OE specs. No cutting, drilling or modification needed during installation. Fast field replacement. A trusted aftermarket spare part for overhaul and routine maintenance, balancing quality and procurement cost.

FAQ 

Q1: Which machine does 358-5004/397-3941 hydraulic pump fit? Can it replace other part numbers?
A1: It is specially designed for CAT307D and CAT307E excavator. Not universal for other CAT models. Mismatched pumps may cause insufficient digging power, slow movement, pressure loss, abnormal noise and damage to valves or cylinders. Please carefully verify machine model and OEM part number before purchase.

Q2: What tests are performed before shipment?
A2: Every hydraulic pump is 100% inspected on hydraulic test bench. Tests include pressure test, flow measurement, internal & external leakage inspection and dimensional verification. Simulated load assessment to guarantee stable performance after installation.

Q3: Is special adjustment required after installation?
A3: Precisely manufactured according to OE dimensions, direct installation normally. After fitting, bleed air from hydraulic circuit, set pressure according to service manual. If machine power is weak or pressure unstable, check system setting and oil cleanliness.

Q4: What pre-installation work helps extend service life?
A4: Clean hydraulic pipeline thoroughly, flush old contaminated oil. Replace hydraulic filter and check oil cleanliness. Inspect control valve, hoses and seals. After installation, run no-load test and monitor pressure and temperature before heavy load work.

warehouse