31Y1-18170 Boom Cylinder Seal Kit for Hyundai R140LC-7 & R140LC-7A Excavators
Product Overview
The 31Y1-18170 boom cylinder seal kit is a factory-manufactured aftermarket replacement kit cross-referenced against the Hyundai part number 31Y1-18170 (also written 31Y118170). Independent aftermarket listings consistently identify the kit as the boom cylinder seal kit for the Hyundai R140LC-7 / R140LC-7A excavators, with R140W-7 / R140W-7A added by several resellers, in a 75 mm rod x 105 mm bore configuration and cross-referenced to the Hyundai cylinder numbers 31N4-50110 / 31N4-50120.
DJF Seals manufactures and supplies the 31Y1-18170 kit at factory-direct wholesale pricing for Hyundai equipment dealers, repair shops and fleet maintenance programs.
Verified Application
The following application data was cross-checked against aftermarket parts listings (SoonParts, OringsAndMore, HWPartStore, Mottrol USA, SunCar-Seals, eBay, Amazon):
| Part Number | 31Y1-18170 (also written 31Y118170) |
| Product Type | Boom cylinder seal kit (aftermarket replacement) |
| Cylinder Position | Boom cylinder (confirmed by multiple independent sources) |
| Verified Fitments | Hyundai R140LC-7 and R140LC-7A; R140W-7 and R140W-7A added by several resellers |
| Cylinder Numbers | 31N4-50110 / 31N4-50120 (per HWPartStore and Mottrol USA) |
| Rod / Bore (per OringsAndMore & HWPartStore) | 75 mm rod / 105 mm bore |
| Condition | New, aftermarket replacement |
Note: materials, pressure rating, temperature range, exact piece counts, certifications and service life are factory data and are not independently verified.
Replacement Scope
This kit covers the sealing elements required to reseal the boom cylinder of the verified Hyundai models. Independent listings cross-reference the kit to the Hyundai boom cylinder numbers 31N4-50110 / 31N4-50120 (HWPartStore, Mottrol USA) in the 75 mm rod x 105 mm bore configuration. Exact kit contents and piece counts should be verified with the factory against your cylinder before ordering.
Fitment Verification
The part number, boom position and fitments were verified through multiple independent sources:
- SoonParts (soonparts.com): “Boom Cylinder Seal Kit 31Y1-18170 31Y118170 for Hyundai Excavator R140LC-7 R140LC-7A R140W-7 R140W-7A” — OEM number 31Y1-18170 / 31Y118170.
- OringsAndMore (oringsandmore.com): 31Y1-18170 boom cylinder seal kit fits Hyundai R140LC-7A; 75 mm rod x 105 mm bore.
- HWPartStore (hwpartstore.com): Hyundai R140LC-7 excavator boom cylinder seal kit; cylinder numbers 31N4-50110 / 31N4-50120; rod 75 mm / bore 105 mm.
- Mottrol USA (mottrolusa.com): 31N4-50110 / 31N4-50120 boom cylinder seal kit fits Hyundai R140LC-7A — confirms the cylinder number pairing with the 31Y1-18170 application.
- eBay: listings describing 31Y1-18170 for the R140-7 / R150-7 / R150W-7 family and for the R140LC-7A; SunCar-Seals and Amazon listings also describe the kit as the boom cylinder kit for the R140LC-7 series.
- Conflict note: R140LC-7 / R140LC-7A / R140W-7 / R140W-7A are confirmed by SoonParts and match the current page. Some listings extend the fitment to the R140-7 / R150-7 / R150W-7 family; those additional models are not confirmed across the source set and are not claimed on this page.
- Conflict note: the engine reference shown on one reseller page is unrelated to seal-kit fitment and is ignored.
- Conflict note: no independent Hyundai OEM catalog reference was accessible for this part number; the identity and fitments above rely on aftermarket listings.
- Materials, pressure, temperature, exact piece counts, certifications and service life are not independently verified.
Factory Inspection & Packing
Each 31Y1-18170 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 31Y1-18170 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 31Y1-18170 seal kit fit?
A: Verified fitments are the Hyundai R140LC-7 and R140LC-7A excavators, with R140W-7 and R140W-7A added by several resellers. Verify your machine model and serial number before ordering.
Q: Which cylinder does this kit service?
A: The boom cylinder. Every independent listing reviewed identifies the kit as a boom cylinder seal kit.
Q: What are the cylinder dimensions for this kit?
A: 75 mm rod x 105 mm bore, per OringsAndMore and HWPartStore.
Q: Which Hyundai cylinder numbers does this kit cross-reference?
A: HWPartStore and Mottrol USA cross-reference the kit to the Hyundai boom cylinder numbers 31N4-50110 / 31N4-50120.
Q: Does this kit fit the R140-7, R150-7 or R150W-7?
A: Those models appear in some reseller listings but are not confirmed across the source set, so they are not claimed on this page. Please verify your machine model and cylinder part number with us before ordering.
Q: What is the minimum order quantity?
A: MOQ: 5 kits.