Genuine Hyundai 31YC-23050 Ring-Cushion | R320LC-7 R450LC-7 Arm Cylinder

Genuine Hyundai 31YC-23050 Ring-Cushion — R320LC-7 & R450LC-7 Arm Cylinder

The Hyundai 31YC-23050 is a genuine OEM cushion ring (Ring-Cushion) used inside the arm cylinder assembly of Hyundai R320LC-7 and R450LC-7 large excavators. This precision-engineered component acts as a hydraulic cushion at end-of-stroke, absorbing impact energy as the cylinder rod reaches full extension or retraction. Worn or cracked cushion rings cause cylinder end-of-stroke banging, premature seal wear, and eventual cylinder damage. Replacing with the correct genuine Hyundai part ensures proper hydraulic cushioning, protects downstream seals, and restores smooth operation to your excavator's arm circuit. This part is sourced directly from Hyundai Construction Equipment (HCE) and stocked at our Kelowna, BC warehouse for fast Canada-wide shipping.

Part Specifications

• Part Number: 31YC-23050 (also referenced as 31YC23050)
• Part Name: Ring-Cushion (Hydraulic Cylinder Cushion Ring)
• Application: Arm Cylinder Assembly
• OEM Brand: Genuine Hyundai Construction Equipment (HCE)
• Condition: New Genuine OEM
• Position in Assembly: Piston cushion ring, installed at cylinder end-cap cushion circuit
• Material: High-durability polyurethane/rubber compound per HCE specification

Fitment

• Hyundai R320LC-7 — Arm Cylinder
• Hyundai R450LC-7 — Arm Cylinder

Always confirm fitment against your machine's serial number and HCE parts catalog before ordering. This part fits within the arm cylinder sub-assembly (ref: 31Y1-19050 / 31Y1-19051 cylinder sub) as position 13 in the HCE EPC.

Frequently Asked Questions

What does the 31YC-23050 cushion ring do?

The Ring-Cushion (31YC-23050) is a hydraulic cushioning component installed inside the arm cylinder. It creates a metered restriction near the end of the cylinder stroke, decelerating the piston smoothly instead of allowing it to slam into the end cap. This reduces shock loads on the cylinder, seals, and the excavator's boom structure.

How do I know if my cushion ring needs replacement?

Common signs of a failed cushion ring include a hard metallic bang at the end of the arm stroke, rapid seal wear or recurring leaks from the cylinder gland, and visible jerking or shock in the arm linkage at full extension or retraction. If your R320LC-7 or R450LC-7 arm cylinder shows these symptoms, inspect and replace the cushion ring as part of your cylinder rebuild.

Is this a genuine Hyundai part or an aftermarket replacement?

This is a genuine Hyundai Construction Equipment (HCE) OEM part — not an aftermarket substitute. Genuine HCE parts are manufactured to exact tolerances, ensuring proper fit and hydraulic sealing performance. Using genuine parts also preserves your warranty and avoids compatibility issues common with off-brand cylinder seals and rings.

Do you ship this part outside British Columbia?

Yes. AIM Rentals stocks this part in Kelowna, BC and ships Canada-wide. Most orders within BC arrive in 1–3 business days; other provinces typically 2–5 business days depending on carrier availability. Contact us for urgent same-day or freight shipping options on larger orders.