Hydraulic Fan Piston Motor 505-5179

Suitable Applications & Use Cases

• Designed for large excavators where engine cooling is critical—particularly machines like the Caterpillar 336 GC, 345 GC and 349 GC.

• Ideal in high-load environments (mining, quarrying, heavy infrastructure work) where the cooling system must perform reliably.

• Recommended if the existing fan motor is slow, failing, leaking hydraulic oil, or if the original part number matches or has been identified as 505-5179/512-0949/505-5180.

Installation & Maintenance Guidelines

1. Ensure machine is shut off, cooled down, and hydraulic system is depressurized before beginning installation.

2. Remove existing fan motor: note mounting orientation, hydraulic hose positions, and any adapter brackets.

3. Inspect mounting surfaces and clean as necessary. Ensure no debris remains.

4. Install the new motor, torque mounting bolts according to manufacturer’s spec (or OEM excavator manual).

5. Re-connect hydraulic lines; bleed system as needed to remove air.

6. After installation, start the machine and check for:

   • proper fan rotation speed

   • absence of unusual vibration or noise

   • no oil leaks at hose/port connections

   • stable engine temperature under load

7. Regular maintenance: check for hydraulic leaks, ensure fan blades are clean and balanced, monitor motor for abnormal noise or overheating.

Shipping & After-Sales Information

• Worldwide shipping is available; lead times typically 3–5 business days for stocked items.

• Packaged in export-standard cartons or wooden crates to protect during transit.

• Warranty: At least 6 months.

• Returns/Exchanges: Please verify part number, machine model and serial number before installation.

Frequently Asked Questions (FAQ)

Q1: Will this motor fit a Caterpillar 336 (non-GC) model?
A1: This part is listed for Caterpillar 336 GC series. For non-GC models, please verify original part number and whether fan drive system is identical.

Q2: What is the difference between 505-5179 and 505-5180 / 512-0949?
A2: These are listed as interchangeable numbers for the same or very similar fan-drive motor assemblies. Confirm with your machine’s serial number and original part number.

Q3: I installed the motor but the fan still runs slowly and temperature stays high—what could be wrong?
A3: The cause may include insufficient hydraulic flow/pressure, clogged filters, unbalanced fan blades, or incorrect installation orientation. Make sure hydraulic circuit meets spec and fan blades are undamaged.

Q4: Do you have full hydraulic performance data (flow, pressure, rpm)?
A4: Public data is limited. Suppliers list the part as a “piston-type fan motor” but do not always publish full numeric specs. We recommend comparing with your original motor’s spec or asking the supplier directly.

Q5: Is this a brand-new OEM part or a remanufactured unit?
A5: Listings indicate “new” or “OEM-quality replacement”. For example some suppliers indicate “brand new – fits for CAT 336GC” with 6-month warranty.

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