Fan Motor (Replacement for CAT C9.3B Engine)
1. Product Overview
This hydraulic fan motor is an aftermarket replacement component specially designed for Caterpillar 336GC, 340GC, 345GC, 349GC excavators equipped with C9.3B engine.
It drives the cooling fan of the engine cooling system, controlling fan speed to adjust heat dissipation efficiency. Multiple OEM part numbers are interchangeable for this fan motor assembly, listed as below:
505-5179, 598-7826, 605-5180, 564-9803, 564-9804,
524-0924, 524-0925, 564-9801, 564-9802, 512-5180,
512-0949, 587-1312
Replacement Fan Motor for CAT 336GC / 340GC is a high‑performance Hydraulic piston motor. As a key hydraulic motor, it can also serve as Hydraulic orbit motor option for cooling drive system. Driven by pressure oil supplied from the excavator hydraulic system, it drives the cooling fan assembly to dissipate heat for engine and hydraulic oil. Specially designed for Caterpillar 336GC and 340GC excavators, this replacement component is widely used for equipment overhaul and aftermarket spare‑parts replacement。
High-quality interchangeable aftermarket fan motor can fully replace original CAT parts for equipment maintenance and overhaul.
2. Main Technical Parameters
Item Specification
Product Name Hydraulic Cooling Fan Motor
Applicable Engine CAT C9.3B
Applicable Excavator Models CAT 336GC, 340GC, 345GC, 349GC
Drive Type Hydraulic drive
Working Pressure Matches original factory standard parameters
Rotation Direction Same as OEM requirement
Seal Material NBR, FKM sealing kit optional
Operating Temperature -20℃ ~ +95℃
3. Working Principle
High-pressure hydraulic oil supplied by the fan pump flows into the fan motor. The internal rotor assembly converts hydraulic energy into mechanical rotational power to drive the cooling fan.
The machine ECU adjusts the output flow of the fan pump according to engine water temperature, oil temperature and ambient temperature, changing the rotating speed of the fan motor. It realizes automatic adjustment of cooling capacity to keep the engine working within the optimal temperature range.
4. Core Advantages
1. Strictly manufactured according to original OEM dimensions, installation size, oil port position completely consistent with original parts, direct plug-and-play replacement.
2. Precision internal components, low internal leakage, stable rotation performance.
3. Reliable sealing structure, effectively prevent external oil leakage under long-term continuous operation.
4. Strong structure, shock and vibration resistance, adapt to heavy-load and harsh construction site working conditions.
5. Complete interchangeability for multiple OEM part numbers, convenient model selection and inventory management.
6. Cost-effective aftermarket spare part, shorter delivery cycle compared with original CAT genuine parts.
5. Application Range
Fit for Caterpillar excavators with C9.3B engine:
CAT 336GC, CAT 340GC, CAT 345GC, CAT 349GC
Used for engine cooling system to drive cooling fan.
