MSF-18-16 Fan Motor for Hitachi ZX350/Kobelco SK550 excavator

product parameters

Part No：MSF-18-16
Type：Fixed Displacement Axial Piston Hydraulic Fan Motor
Theoretical Displacement：18 cc/rev, Max output torque 52 N·m
Applicable Equipment：Hitachi ZX350 series excavator, Kobelco SK550 excavator
Material：High strength ductile iron housing, carburized alloy steel piston, bronze valve plate, reinforced roller assembly
Surface Treatment：Manganese phosphate anti-rust treatment, ultrasonic inner cavity cleaning, remove casting sand and metal debris completely
Control Mode：Flow-controlled stepless speed regulation
Rated Working Pressure：21 MPa
Max Instantaneous Peak Pressure：26 MPa
Feature：Stable output torque, low internal leakage, smooth rotation, low vibration & noise, strong anti-pollution performance, compact structure for medium & large excavator cooling drive
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 ductile iron housing. Integral casting plus stress relief annealing treatment, great toughness and crack resistance. It reliably withstands alternating torque impact and fluctuating hydraulic pressure under quarry and construction site conditions. No easy deformation under continuous heavy-duty operation and keeps steady torque output.
• Ultra-precision machined internal friction pairs. Piston, bronze valve plate and reinforced roller assembly are finished to tight tolerance. Low volumetric leakage, smoother rotation. Speed responds sensitively to hydraulic flow, precisely matching heat dissipation requirement of engine and hydraulic oil.
• Excellent resistance to contaminated hydraulic oil. Optimized flow channel design reduces jam risk caused by tiny particles. Manganese phosphate anti-rust coating protects outer housing against dust, mud and humidity in harsh site environments, cutting down wear and premature failure risks over long service cycles.
• Strict multi-stage inspection before shipment. Each fan motor is tested on hydraulic bench for torque, speed and leakage. Shaft dimension and assembly quality are fully verified. Batch consistency is guaranteed; defective products will be rejected before packing.
• Protect engine, hydraulic assembly and whole cooling system. Constant torque output drives cooling fan reliably. Prevent overheating damage to engine and hydraulic components, protect radiator, hoses and sealing kits, reducing secondary failure risk of related hydraulic spare parts.

FAQ 

Q1: Which machine does MSF-18-16 fan motor fit? Can it replace other part numbers?
A1: It is specially designed for Hitachi ZX350 series excavator and Kobelco SK550 excavator. Not universal for other excavator models. Wrong motor selection may lead to insufficient fan torque, machine overheating, jamming or shaft damage. Please verify machine model and part number before purchase.

Q2: What tests are performed before shipment?
A2: Every fan motor is 100% inspected on hydraulic test bench. Tests include torque test, rotating speed test, internal & external leakage inspection and dimensional verification. Simulated load assessment to guarantee stable performance after installation. Test records can be supplied upon request.

Q3: What is your warranty, and what is excluded?
A3: 12-month warranty under correct installation, clean hydraulic oil and normal operation. Warranty excludes damage caused by contaminated oil, foreign particle jamming, overpressure, improper piping and poor maintenance.

Q4: Is special adjustment required after installation?
A4: Precisely manufactured according to OE dimensions, direct installation normally. After fitting, bleed air from hydraulic circuit, check fan rotation direction. If the machine still overheats, inspect hydraulic supply pressure and oil cleanliness.

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