Product Overview

The 31Y1-18110 arm cylinder seal kit is a factory-manufactured aftermarket replacement kit cross-referenced against the genuine Hyundai part number 31Y1-18110, described in Hyundai parts systems as “SEAL KIT” / “SEAL KIT-CYL” for the arm (crowd) cylinder. It is designed for the arm cylinders of Hyundai R140 series excavators and is intended to restore leak-free sealing performance and consistent holding pressure during an arm cylinder overhaul.

The arm cylinder handles the digging and crowd function, pulling the bucket toward the cab under excavation load. DJF Seals manufactures and supplies the 31Y1-18110 at factory-direct wholesale pricing for Hyundai equipment dealers, independent repair shops and fleet maintenance programs.

Verified Application

The following application data was cross-checked against public OEM references, dealer parts stores and marketplace listings:

Note: specific material grades, pressure rating, temperature range, exact piece counts, certifications and service life are factory data and are not independently verified. Confirm these details with the factory before ordering.

Replacement Scope

This kit covers the sealing elements required for a full arm cylinder rebuild, including the rod seal, piston seal, wiper (dust seal), O-rings and backup rings for the 31Y1-18110 cylinder configuration. Exact kit contents and piece counts should be confirmed with the factory against your cylinder before ordering.

Fitment Verification

The part number, cylinder position and fitments were verified through multiple independent sources:

• 777parts.com (Hyundai spare parts database): part 31Y1-18110 SEAL KIT, unit ARM CYLINDER; listed models R140LC-7, R140LC-7A (crawler excavator) and R140W-7, R140W-7A (wheel excavator).
• Modern Equipment Parts and BuyAftermarketParts: Hyundai 31Y1-18110 SEAL KIT-CYL, genuine Hyundai construction equipment part number.
• eBay listings: “31Y1-18110 Cylinder Seal Kit For Hyundai R140LC-7 R140W-7” and “31Y1-18110 Arm Hydraulic Cylinder Sealing Kit for Hyundai R140LC”.
• DeepParts and SoonParts: Arm Cylinder Seal Kit 31Y1-18110 / 31Y118110 for Hyundai Excavator R140LC-7, R140LC-7A, R140W-7, R140W-7A, rod 80 mm, bore 115 mm.
• Colorfulparts: Hyundai R140W-7 wheel excavator arm cylinder seal kit 31Y1-18110.
• 80 mm rod x 115 mm bore is confirmed by multiple third-party listings.
• Materials, pressure, temperature, piece counts, certifications and service life are not independently verified.

Factory Inspection & Packing

Each 31Y1-18110 kit is assembled and checked at the DJF factory before packing. Sealing elements are placed in labeled poly bags marked with the part number, then packed into export cartons for protection during international shipping. Kits can be packed under DJF branding, neutral packaging, or your own private label for distribution.

Wholesale Ordering

DJF Seals supplies the 31Y1-18110 kit at factory-direct wholesale pricing for distributors, dealers and repair shops. To request a quotation, send your part number and quantity to [email protected] or [email protected]. OEM/ODM service, custom packaging and bulk container shipping are available for regular programs.

MOQ

MOQ: 5 kits.

FAQ

Q: Which machines does the 31Y1-18110 seal kit fit?
A: Verified fitments are Hyundai R140LC-7 and R140LC-7A crawler excavators, plus R140W-7 and R140W-7A wheel excavators, for the arm cylinder. Confirm with your machine serial number and parts book before ordering.

Q: Is 31Y1-18110 a genuine Hyundai part number?
A: Yes. The OEM number 31Y1-18110 is listed in Hyundai parts systems as a SEAL KIT for the ARM CYLINDER. This page sells a factory-made aftermarket replacement cross-referenced to that number.

Q: What are the cylinder dimensions for this kit?
A: Independent listings confirm the arm cylinder configuration as 80 mm rod x 115 mm bore.

Q: What is the minimum order quantity?
A: MOQ: 5 kits.