505-5179 Fan Motor for Caterpillar 336GC excavator

product parameters

Part No：505-5179
Type：Fixed Displacement Hydraulic Piston Fan Motor
Applicable Equipment：CAT336GC Excavator
Material：High strength cast iron housing, alloy steel piston assembly
Surface Treatment：Anti-rust coating, internal cavity flushing & cleaning
Control Mode：Hydraulic flow control
Feature：Large output torque, low internal leakage, smooth rotation, excellent shock resistance, high wear resistance
Working Temperature：-20℃ ~ +110℃
Max working pressure：28.5MPa
Displacement：Fixed 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 cast iron housing. Precision casting plus stress relief annealing treatment. Excellent structural rigidity and shock resistance. It reliably withstands fluctuating hydraulic pressure and cyclic torque impact during excavator operation. It is not prone to deformation under continuous heavy-duty working conditions and maintains stable torque output.
• Precision lapped internal friction pairs. Pistons, slippers and valve plate are machined to tight tolerance. It achieves higher volumetric efficiency and lower internal leakage. Rotation runs smoothly, responding rapidly to hydraulic flow change to adjust fan speed.
• 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.
• Strict multi-stage inspection before shipment. Each motor is tested on hydraulic bench to check pressure, output torque and external leakage. Shaft dimension and assembly quality are fully verified. Batch consistency is guaranteed, and non-conforming products are eliminated before packing.
• Direct replacement with good cost performance. All mounting dimensions, port layout and shaft 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 505-5179 fan motor fit? Can it replace other part numbers?
A1: It is specially designed for CAT336GC excavator. Not universal for other CAT models. Mismatched motors may cause insufficient fan torque, fan stalling, engine overheating, pressure surge and damage to fan pump. Please carefully verify machine model and OEM part number before purchase.

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

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 from contaminated oil, cavitation, wrong piping, overpressure, oil shortage 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. If engine temperature remains high, check system pressure and motor rotation condition.

warehouse