Komatsu Forklift Torque Converter 3EB-13-31212 – C12 C14

Komatsu Forklift Torque Converter 3EB-13-31212 — C12 / C14 Series Direct Replacement

The 3EB-13-31212 torque converter is the OEM-spec hydraulic coupling for Komatsu C12 and C14 series forklift transmissions. Designed and manufactured in Japan to Komatsu’s original engineering specifications, this 3-element converter (pump, turbine, stator) delivers the exact stall speed and torque multiplication ratio required by the Komatsu powershift drivetrain. The C12/C14 series uses a compact converter design distinct from larger Komatsu models — the 3EB-13-31212 has a specific bolt circle diameter and pilot hub depth that does NOT interchange with FD-series or FG-series Komatsu torque converters. Verify your transmission tag for “C12” or “C14” model code before ordering.

This torque converter weighs approximately 3.8 kg in its compact design for the C12/C14 mid-capacity chassis. Installation requires draining the transmission fluid, removing the flexplate access cover, and unbolting the converter from the flexplate through the access window. The converter pilot hub must seat fully into the crankshaft — if the converter does not slide in the final 3-5 mm by hand, do not force it with the bellhousing bolts, as this will destroy the front pump gears. Apply a thin coat of transmission fluid to the pilot hub and input shaft seal before assembly. Replace the front pump seal and input O-ring with every converter change — these seals are single-use and the labor to re-access them costs far more than the parts. Fill with Komatsu TO-30 or Dexron III ATF and perform the bleed procedure before putting the forklift into service.

Common failure indicators include transmission slipping in forward ranges under load (stator sprag clutch failure), shudder during lockup engagement (glazed friction material), and RPM flare between shifts (worn pump hub bearing). If you detect a burnt smell in the transmission fluid or find metallic particles on the dipstick, the cooler circuit must be flushed before installing the replacement converter — debris from a failed unit will circulate back and damage the new converter’s precision-machined components within the first operating hour. For related Komatsu drivetrain parts including transmission filters, clutch packs, and control valve bodies, browse our Forklift Hydraulic Transmission Parts collection. OEM technical documentation is available at the Komatsu official website.

Technical Specifications

Compatible Forklift Models

Each torque converter is carefully packaged with foam padding in a sturdy export-grade carton. Standard air freight delivery to major ports worldwide in 5-10 business days. For compatibility questions or bulk orders, contact our team with your Komatsu model and serial number.