350-0666/335-8197 hydraulic fan motor For CAT 422E backhoe loader

product parameters

Part No：350-0666 / 335-8197
Type：Variable Axial Piston Hydraulic Fan Motor
Displacement：32 cc/rev
Applicable Equipment：CAT 422E Backhoe Loader, compatible with 414E,416E,428E,434E
Control Mode：Hydraulic pressure proportional control
Material：High-strength cast iron housing, alloy steel piston & cylinder block, copper alloy valve plate, roller bearing, FKM fluorine rubber sealing rings
Surface Treatment：Precision machining, surface hardening, anti-corrosion coating
Drive Method：Hydraulic oil drive
Nominal Working Pressure：24 MPa
Max Instantaneous Peak Pressure：30 MPa
Feature：OEM replacement fan motor, high starting torque, low internal leakage, stable rotation, direct drop-in fit, matched with supporting fan pump for cooling system
Working Temperature：-25℃ ~ +115℃
Rated Rotation Speed：1900 rpm, Max allowable speed:2500 rpm

・350-0666/335-8197 variable piston hydraulic fan motor, OEM replacement, perfectly matched with supporting fan pump for CAT422E backhoe loader cooling system
350-0666/335-8197 hydraulic fan motor is custom fitted for CAT422E backhoe loader cooling circuit. It converts hydraulic pressure into rotary torque to drive cooling fan. Stable torque output ensures fan can adjust speed flexibly under continuous earthmoving and loading operation, preventing engine overheating.
・Precision hardened piston and cylinder block assembly, stable torque output and low flow pulsation
Alloy steel piston and cylinder block adopts precision grinding and surface hardening process. It maintains steady torque output under variable inlet pressure. Volumetric efficiency stays high to guarantee consistent fan rotation for cooling circuit.
・High-rigidity cast iron housing with stress relief treatment, excellent anti-vibration and pressure impact resistance
Cast iron housing after stress relief annealing eliminates internal residual stress. It can resist continuous vibration and cyclic pressure impact on construction sites. The housing is not easy to deform, slowing down wear of internal piston, valve plate and bearing components and extending service life.
・Strong overload resistance, effectively protect radiator and engine assembly
This fan motor features excellent overload tolerance. It provides stable rotary power for cooling fan. It maintains cooling hydraulic system operating normally, preventing radiator overheating caused by insufficient fan torque or unstable rotation, ideal replacement for overhaul and daily maintenance of CAT422E backhoe loader.

FAQ 

Q1: What machine models does 350-0666/335-8197 fan motor fit?
A1: Primary fit CAT422E backhoe loader, also interchangeable for CAT414E,416E,428E,434E E-series backhoe loaders. Please verify part number before ordering.

Q2: What is the difference between piston fan motor and gear fan motor for backhoe loader?
A2: Piston type has higher torque and better high-pressure resistance, suitable for heavy continuous loading work. Gear type is compact and cost-effective for light-duty operation.

Q3: What signs indicate early failure of this piston fan motor?
A3: Gradually dropping fan speed under heavy load, rising engine temperature, obvious internal leakage and abnormal rattling noise when starting up.

Q4: What precautions should be taken during installation?
A4: Clean hydraulic pipeline thoroughly before installation, avoid dirt entering the motor. Confirm fan rotation direction and bleed air from the whole hydraulic circuit after assembly.

Q5: How to judge whether the motor internal parts are damaged?
A5: Carry out bench test to check volumetric efficiency and output torque. If volumetric efficiency drops sharply, piston or valve plate may be scratched and worn.

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