FREQUENTLY ASKED QUESTIONS (FAQ)
Q1: What is the difference between 21N8-10013 and 21N8-10014?
A: In most contexts, these two numbers represent the Travel Motor Assembly (the hydraulic part) and the Travel Gearbox Assembly (the mechanical reduction part). However, in some catalogs, they denote the Left-hand and Right-hand units. It is essential to check your machine's parts manual to determine which number corresponds to which side or component.
Q2: Can I replace just the hydraulic motor without replacing the gearbox?
A: Yes, provided the gearbox is in good condition. If the gearbox has excessive play, metal debris, or water ingress, it should be rebuilt or replaced simultaneously to prevent damage to the new motor.
Q3: Why does my travel motor make a whining noise?
A: Whining noise can be caused by:
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Air in the system: Bleed the system immediately.
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Low oil level: Check the hydraulic tank.
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Clogged suction filter: Replace the filter.
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Internal wear: If the noise persists, the pistons or cylinder block may be worn, requiring a rebuild.
Q4: What is the warranty period for these parts?
A: Standard warranty for these hydraulic components is typically 6 to 12 months, depending on the supplier. However, warranty is void if the unit is disassembled, if the system was not flushed after a previous failure, or if the wrong hydraulic oil was used.
Q5: How do I know if my travel motor is a two-speed or single-speed unit?
A: Check the number of hydraulic lines connected to the motor. A single-speed motor has 2 main lines (In/Out) and 1 drain line. A two-speed motor has 2 main lines, 1 drain line, and 2 smaller pilot lines (for speed control and brake release).
Q6: Can I use this motor on a different brand of excavator?
A: It is not recommended unless you are a qualified hydraulic engineer. While the motor might physically fit, the hydraulic flow and pressure requirements may not match the host machine's pump, leading to poor performance or failure.
Q7: What type of hydraulic oil should I use?
A: Always use the oil specified by the excavator manufacturer. Typically, this is an ISO VG 46 anti-wear hydraulic oil. Using the wrong viscosity can cause overheating and internal damage.
Q8: Do I need to replace the hydraulic filter after installing a new travel motor?
A: Yes. It is highly recommended to replace the return filter and the suction filter immediately after installation. If the old motor failed, the system should be flushed with a flushing fluid, and the filters replaced again after 50 hours of operation.
Q9: What is the typical lead time for these parts?
A: Lead times vary. Standard stock items may ship within 24-48 hours. Custom or non-stock items may take 15-30 days for manufacturing or sourcing.
Q10: How do I identify if I have a genuine OEM part or an aftermarket replacement?
A: Genuine OEM parts will have the Hyundai logo and part number cast or stamped into the metal. Aftermarket parts may have the part number but lack the logo. Aftermarket parts can be of high quality (e.g., from reputable manufacturers) or low quality. Always source from a trusted supplier.
End of Document
Disclaimer: This document is for informational purposes only. The manufacturer reserves the right to change specifications without notice. Always consult the official service manual for your specific machine before performing any repairs.
