Forklift Transmission Torque Converter 245299 – Clark

Forklift Transmission Torque Converter 245299 — Clark CQ20D/CQ25D/CQ30D Series

The 245299 torque converter serves as the direct-fit hydraulic coupling for Clark CQ20D, CQ25D, and CQ30D forklift transmissions. Unlike generic aftermarket converters, this unit matches the OEM stall speed and torque multiplication curve calibrated specifically for Clark’s powershift drivetrain — installing a mismatched converter can cause overheating, delayed engagement, or premature pump failure. The 245299 interchanges directly with the factory Clark part number and bolts on without adapter plates or fluid circuit modifications.

This torque converter transmits engine power through a fluid coupling that multiplies torque during acceleration and locks up at cruising speed, allowing the Clark forklift to handle sudden load changes without stalling. The three-element design (pump, turbine, stator) provides a stall torque ratio optimized for 2-3.5 ton material handling applications. Common failure points that are often misdiagnosed include stator sprag clutch slippage (causes poor low-speed torque), contaminated fluid degrading the lockup clutch friction material (causes shudder), and worn pump hub bearing (causes whine that changes pitch with RPM). If you’re experiencing delayed forward engagement, transmission overheating under load, or RPM flare during shifts — check the converter before replacing the transmission.

Installation requires draining the transmission fluid completely and flushing the cooler lines to remove debris from a failed converter. The flexplate-to-converter bolts must be torqued to Clark specification (typically 45-55 Nm, cross-pattern) — over-torquing warps the flexplate and causes runout that destroys the front pump bushing within hours. Always replace the front pump seal and input shaft O-ring when swapping the converter; reusing old seals is the number one cause of post-installation leaks. Fill with fresh ATF meeting Clark Type A or Dexron III specification, then perform the Clark bleed procedure: start engine, idle 30 seconds, shift through all ranges with brake applied, recheck fluid level hot.

This torque converter fits Clark CQ20D (2-ton), CQ25D (2.5-ton), and CQ30D (3-ton) diesel forklift models. It is compatible with the Clark powershift transmission used across these model years and does NOT fit earlier Clark C500 or CMP series trucks — check your transmission tag for “CQ” prefix before ordering. For related transmission components including input plates, clutch packs, and transmission filters, browse our Forklift Hydraulic Transmission Parts collection. For OEM technical specifications and service bulletins, refer to the Clark Material Handling official website.

Technical Specifications

Compatible Forklift Models

Each torque converter is carefully packaged in a reinforced wooden crate with internal foam bracing to prevent damage during international shipping. Standard air freight delivery to major ports worldwide in 5-10 business days. For bulk orders, volume discounts, or technical compatibility questions, contact our sales team with your forklift model and serial number.