Forklift Gearbox Assembly YQXD30H-D1 — HC/HL 3T, C240 Engine, RWD Transmission, 185kg

This is the gearbox assembly (part number YQXD30H-D1) — a complete forklift transmission for HC (Hangcha) and HL (HELI) 3-ton forklifts with Isuzu C240 diesel engines in rear-wheel-drive configuration. The gearbox assembly is the complete transmission unit that provides the gear reduction between the engine and the drive axle — on a 3-ton IC forklift with a C240 engine producing approximately 45-50 kW at 2,500 RPM, the gearbox reduces engine RPM through multiple gear ratios (typically 3-4 forward speeds plus reverse) to deliver the correct wheel speed and torque multiplication for load handling, travel, and grade climbing. The YQXD30H-D1 is designed for RWD (rear-wheel-drive) forklift platforms where the engine and transmission are mounted longitudinally with the drive axle at the rear — the most common configuration for 3-ton IC forklifts worldwide. The gearbox assembly includes the transmission case (cast iron housing), the gear train (helical or spur gears on parallel shafts with synchronizers for forward speeds and a sliding gear for reverse), the shift mechanism (shift forks, selector rails, and detent springs), the input shaft (splined to accept the clutch disc hub), and the output shaft (connecting to the drive axle via a universal joint or flexible coupling). A gearbox that grinds during shifting, jumps out of gear under load, or produces a loud whine in a specific gear has internal damage — typically worn synchronizer rings (grinding), worn detent springs or shift fork pads (jumping out of gear), or pitted/spalled gear teeth (whining). Rebuilding a transmission requires precision measurement of every bearing fit, gear backlash, and synchronizer clearance — replacing the complete assembly is often more cost-effective than a rebuild when parts and labor are combined.

Manufactured in Guangdong, China for forklift transmission applications. New condition. 185 kg gross weight (80×60×60 cm package). Applied models: HC (Hangcha) and HL (HELI) 3-ton forklifts with Isuzu C240 diesel engines. Gearbox assembly product name, forklift usage. RWD drive type, forklift transmission parts type. When replacing a gearbox assembly, always replace the clutch assembly (disc, pressure plate, release bearing) at the same time — the transmission must be removed to access the clutch, so the labor is identical. Verify the input shaft splines match the clutch disc hub spline count and diameter before installation. Drain the old transmission oil and flush the case — metal particles from a failed transmission contaminate the oil and will damage the new gearbox if the oil is reused. Fill with the correct grade of gear oil (typically SAE 80W-90 or ISO VG 150 for forklift transmissions). Check the transmission mounting bolts and crossmember for cracks or elongation — a gearbox that has been operating with loose mounts will have damaged the mounting points. Torque all mounting bolts to specification. After installation, check the transmission-to-axle alignment using a dial indicator on the coupling flanges — angular misalignment destroys the universal joint and the transmission output shaft bearing.

Compatible with HC (Hangcha) and HL (HELI) 3-ton forklifts using Isuzu C240 diesel engines in RWD configuration. Browse our gearbox assembly selection for Hangcha electric and HELI reducer options. Visit HELI official website.

Technical Specifications

Compatible Models

Complete gearbox. Replace clutch simultaneously. Confirm your forklift model →