Doosan Forklift Torque Converter Housing 110931-02156 – D30NXP

Doosan Forklift Torque Converter Housing 110931-02156 — D20NXP to D35NXP Series

The 110931-02156 torque converter housing serves as the structural bellhousing that mates the Doosan D20NXP-D35NXP series engine to the powershift transmission — it encloses the torque converter, provides the flexplate access window, and aligns the transmission input shaft to the crankshaft centerline. This housing is cast and precision-machined to Doosan OEM tolerances; any deviation in the dowel pin bore locations or the transmission mounting face flatness causes converter pilot misalignment, which in turn destroys the front pump bushing and input shaft seal within the first operating hour. The housing also integrates the transmission fluid cooler line pass-through ports and the starter motor mounting boss — cracked or stripped threads at any of these mounting points render the housing unserviceable.

The 110931-02156 housing fits Doosan D20NXP, D25NXP, D30NXP, D33NXP, and D35NXP diesel forklifts, covering the 2-ton through 3.5-ton capacity range with the NXP-series powershift transmission. This housing is interchangeable across all D-NXP models within this capacity band — the engine block bolt pattern, dowel pin spacing, and transmission mounting face are identical across the series. However, the 110931-02156 does NOT fit earlier Doosan D20S/D25S/D30S models — those use a different bellhousing bolt circle diameter and require housing part number 110931-02153. Always verify your data plate for “NXP” suffix before ordering.

Installation requires removing the transmission assembly from the forklift — this is not an in-frame service. Procedure: drain transmission fluid, remove starter motor, disconnect cooler lines at the housing pass-through fittings, unbolt the torque converter from the flexplate through the access window, support the transmission on a jack, remove bellhousing-to-engine bolts in a crisscross pattern, and separate the transmission from the engine. Before installing the replacement housing, inspect the engine block dowel pins for scoring or wear — damaged dowels must be replaced or they will distort the new housing’s alignment. Torque bellhousing bolts to Doosan specification (typically 75-85 Nm) using a calibrated torque wrench. Apply a thin bead of RTV silicone to the housing-to-engine mating surface only — do NOT apply sealant to the transmission mounting face. Replace the front pump seal and input shaft O-ring as part of this service.

For related Doosan drivetrain components including torque converters, clutch packs, and transmission control valves, browse our Forklift Hydraulic Transmission Parts catalog. OEM specifications and service bulletins are available at the Doosan Industrial Forklifts website.

Technical Specifications

Compatible Forklift Models

Each torque converter housing is packaged in a reinforced carton with foam padding to protect machined surfaces during international shipping. Standard air freight delivery to major ports worldwide in 5-10 business days. For compatibility verification or bulk orders, contact our team with your Doosan model and serial number.