Forklift Transmission Input Plate YJH315E-4BJQTXB – CPCD40 CPCD45R HC

Forklift Transmission Flex Plate YJH315E-4BJQTXB — CPCD40, CPCD45R, HC Forklifts

This is the transmission flex plate (part number YJH315E-4BJQTXB) for HC CPCD40RG, CPCD40, and CPCD45R 4-4.5 ton forklifts — the steel flex plate that bolts between the engine crankshaft and the torque converter, transmitting engine torque while absorbing minor angular misalignment and axial movement between the engine and transmission. The flex plate — also called drive plate or input plate — is a thin steel disc with a bolt circle pattern at the outer diameter (matching the torque converter bolt pattern) and a smaller bolt circle at the center (matching the crankshaft flange). The “flex” in flex plate comes from the slight flexibility of the thin steel disc, which accommodates the minor dimensional variations between the engine block and transmission bell housing that are unavoidable in a bolted assembly spanning across two separate castings. A cracked flex plate — typically from fatigue cracking radiating from a bolt hole after being installed with over-torqued or unevenly torqued bolts — produces a metallic clicking or knocking sound that changes with engine RPM but not with transmission gear selection. The crack propagates rapidly once started because the flex plate cycles from tension to compression on every crankshaft revolution (at 2,500 RPM, that’s 42 cycles per second). A completely fractured flex plate disconnects the engine from the transmission entirely — the engine runs but no power reaches the drive wheels, and the forklift is immobile.

New condition, flex plate product name. Part number YJH315E-4BJQTXB. Parts for CPCD40, CPCD45R, and CPCD40RG 4-4.5 ton forklifts using HC (Hangcha) or similar transmission platforms. When installing the flex plate, verify the crankshaft flange and flex plate center bore are clean and free of burrs — any debris between the mating surfaces creates runout that causes vibration and accelerates flex plate fatigue. Apply thread locker to the flex plate-to-crankshaft bolts and torque them to specification in a cross pattern. Then torque the torque converter-to-flex plate bolts to specification. Check the flex plate for visible cracks around the bolt holes before installation — even a hairline crack will propagate under load. Rotate the engine by hand through several complete revolutions after installation and verify there is no binding or interference between the flex plate and the bell housing or starter motor pinion.

Compatible with HC CPCD40RG, CPCD40, and CPCD45R forklifts. Browse our transmission input plate selection. Visit Hangcha official website.

Technical Specifications

Compatible Models

Torque in cross pattern. Confirm your forklift model →