Forklift Hydraulic Oil Filter H24C7-50302 / Y0809A — OEM Return Line Element

The H24C7-50302 (alternate part number Y0809A) is an OEM-specification hydraulic return filter element used in Doosan, Hyundai, and Clark forklift hydraulic systems across the 2-5 ton class. This filter uses a glass-fiber-reinforced cellulose media with a beta ratio of β12≥75 (98.7% efficiency at 12 microns) — calibrated for the sensitivity of the load-sensing hydraulic pumps used on these machines, which have pressure-compensated swashplate clearances of 3-5 microns. The Y0809A designation references the element form factor: approximately 80mm OD and 90mm overall length, with a 15mm center hole and Buna-N end seals. The steel end caps are crimped to the center tube rather than bonded, providing a positive mechanical lock that prevents end cap separation at differential pressures up to 6 bar.

The most critical aspect of H24C7-50302 replacement is verifying the filter bypass valve setting in the housing — Doosan forklifts produced before 2015 use a 2.0 bar bypass spring, while 2015+ models use a 2.5 bar spring. Installing this element in a housing with the wrong bypass spring will cause either premature bypass (under-sprung) or element collapse (over-sprung). The bypass spring color code is stamped on the spring retainer: green = 2.0 bar, blue = 2.5 bar. When removing the old element, note whether the center tube shows any signs of oval deformation — an ovalized tube indicates the element experienced a pressure spike exceeding its rated differential, typically from a cold-start condition with hydraulic oil below 0°C. Always replace the housing cover O-ring simultaneously. Common failure symptoms: hydraulic system pressure fluctuations of ±5 bar during lift operations (restricted return causing erratic pump compensator response), steering wheel “kickback” during low-speed maneuvers (contaminated oil causing steering priority valve sticking), and hydraulic oil discoloration to a dark brown within 200 hours of a filter change (bypass open continuously).

This filter fits Doosan D20S-D50S, Hyundai 20D-50D, and Clark C20-C35 series forklifts. Verify OEM number H24C7-50302 on your existing filter element before ordering. For related hydraulic components, visit our Forklift Hydraulic Components section.

Technical Specifications

• Part Numbers: H24C7-50302, Y0809A
• Filter Type: Return-Line Hydraulic Element
• Filtration Rating: β12≥75 (98.7% at 12 Microns)
• Element Dimensions: ~80mm OD × 90mm Length
• End Cap Construction: Crimped Steel (Mechanical Lock)
• Application: Doosan/Hyundai/Clark 2-5T

Compatible Forklift Models

Each filter is individually packed and ships within 1-2 business days. 12-month warranty. Browse our Forklift Maintenance Parts catalog.