Doosan Forklift Hydraulic Seal Kit 401107-02654 — D30NX(M) / D33NX(M) / D35NX(M)

The 401107-02654 hydraulic seal kit contains the complete set of seals for Doosan D30NX(M), D33NX(M), and D35NX(M) forklift hydraulic cylinders. This OEM seal kit includes all piston seals, rod seals, wiper seals, O-rings, and backup rings required for a complete cylinder rebuild — every seal that contacts hydraulic fluid or the cylinder rod during operation is included. Using a complete kit ensures all wear components are replaced simultaneously, preventing the common scenario where a cylinder is rebuilt with only the obviously failed seal, only to have another aged seal fail weeks later requiring a second disassembly.

This seal kit fits the Doosan D-NX(M) series forklifts in the 3-ton to 3.5-ton capacity range. The “(M)” suffix in the model designation indicates specific cylinder variants within the NX series — the kit is compatible with both standard and M-variant cylinders on D30NX, D33NX, and D35NX models. Common seal failure indicators that call for this kit include: external hydraulic oil dripping from the cylinder rod area (rod seal failure), mast drift or slow lowering under load (piston seal bypass), oil-contaminated exterior of the cylinder (wiper seal failure allowing dirt ingress that damages internal seals), and reduced lifting capacity at rated load (internal seal leakage). Always replace all seals as a complete kit — partial replacement guarantees premature failure of the remaining old seals.

Installation requires complete cylinder disassembly, thorough cleaning of all components, and inspection of the cylinder bore and rod surface for scoring or pitting before installing new seals. Lubricate all seals with clean hydraulic fluid during assembly. The rod surface must be free of scratches, rust, or chrome damage — a damaged rod will destroy new seals within the first operating hour. For related Doosan hydraulic components, browse our Forklift Hydraulic System catalog.

Technical Specifications

Compatible Forklift Models

Each seal kit is packaged for clean storage and safe transport. Standard air freight delivery to major ports worldwide. For compatibility verification or bulk orders, contact our team with your Doosan model and cylinder specifications.