137-3746 Fan Motor Mount Shaft for Caterpillar 336D excavator

product parameters

Part No：137-3746
Type：Fan Motor Mount Shaft / Fan Drive Spindle
Applicable Equipment：CAT336D Excavator, C9 Engine Cooling Fan Assembly
Material：Alloy Steel（42CrMo）
Surface Treatment：High frequency quenching, anti-rust oil coating
Machining standard：CNC precision turning & grinding
Feature：High bending strength, anti-fatigue, wear-resistant, precise concentricity, stable torque transmission
Working Temperature：-20℃ ~ +180℃
Tensile strength：≥980MPa
Surface hardness：HRC 48~55
Thread specification：Matched OEM thread standard
Condition：Brand new, 100% dimension checking, concentricity test & non-destructive flaw inspection
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

• Premium alloy steel raw material. Made of 42CrMo and processed by quenching and tempering heat treatment. Excellent bending strength and impact resistance. Effectively withstand cyclic bending load generated by high-speed fan rotation. Not easy to bend or fracture under long-time high-temperature vibrating environment, keeps stable torque transmission continuously.
• Precision grinding for shaft journal. Shaft diameter, taper and thread are strictly machined according to OE drawings. Guarantees ultra-low concentricity after installation, reduces fan runout and eccentric wear. Minimizes extra dynamic load transferred to bearings and fan motor.
• Strong adaptability to harsh construction environments. Treated with high-frequency surface hardening plus anti-rust oil. It can withstand dust, mud, temperature fluctuation and continuous vibration at job sites. Reduce the risk of abrasion, pitting and fatigue fracture during long service cycles.
• Strict multi-stage inspection before shipment. Each shaft is checked for dimension accuracy, concentricity measurement, surface defect inspection and thread integrity test. Surface finish and roundness are fully verified. Consistent dimensional accuracy batch by batch. Non-conforming products are eliminated before packing.
• Protect the whole fan drive assembly. Precise spindle reduces vibration and runout. Shield bearings, oil seals and fan hub from excessive eccentric load. Prevent secondary damage and extend service life of the entire cooling fan package.

FAQ 

Q1: Which machine does 137-3746 fan motor mount shaft fit? Can it replace other part numbers?
A1: It is specially designed for CAT336D excavator C9 engine cooling fan assembly. Not universal for other CAT models. Mismatched shafts may cause fan runout, vibration, shaft bending and damage to bearings and fan motor. Please carefully verify machine model and OEM part number before purchase.

Q2: What tests are performed before shipment?
A2: Every fan motor mount shaft is 100% inspected. Tests include dimension check, concentricity measurement, non-destructive flaw detection and thread verification. Simulated rotation assessment to guarantee stable performance after installation.

Q3: What is your warranty, and what is excluded?
A3: 12-month warranty under correct installation, proper assembly and normal operation. Warranty excludes damage from improper fitting, violent impact, overloading, misalignment and poor lubrication.

Q4: Is special adjustment required after installation?
A4: Precisely machined according to OE dimensions, direct installation normally. After fitting, check fan runout. If obvious vibration exists, recheck assembly concentricity and bearing condition.

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