Forklift Idler Gear YQX30-0013 — Transmission Timing Gear for 1.0-1.8T A273/A279 Series

The YQX30-0013 is an idler gear (also called a reverse idler or intermediate gear) for the A273 and A279 series hydraulic transmissions used in 1.0-1.8 ton compact forklifts. An idler gear in a powershift transmission does not transmit power directly to the output shaft — instead, it serves as an intermediate gear that reverses the direction of rotation between two other gears, most commonly enabling the reverse gear function without adding an additional gear to the countershaft. This YQX30-0013 gear is manufactured from case-hardened 20CrMnTi alloy steel with a surface hardness of HRC 58-62 and shot-peened tooth roots for fatigue resistance — critical because the idler gear experiences full torque load during every reverse operation, which can account for 15-20% of total transmission operating hours in warehouse applications. The gear features a needle roller bearing bore with a 0.02-0.04mm running clearance — this allows the gear to rotate freely on its stationary shaft when not engaged, but the tight clearance prevents the “rattling” noise that occurs when an idler gear with excessive bearing clearance oscillates during forward operation.

Idler gear replacement requires the transmission to be partially disassembled to access the idler gear shaft. The idler shaft is typically a press-fit into the transmission case, and removing it requires a slide hammer or hydraulic puller — never hammer on the end of the shaft, as this will mushroom the shaft end and make removal impossible without damaging the case bore. Before installing the new gear, the needle bearing must be packed with transmission assembly grease that is compatible with the ATF specification — using general-purpose wheel bearing grease will clog the transmission filter within the first 50 hours of operation. The idler shaft end-play after installation must be checked: 0.05-0.15mm is the acceptable range, set by a selective-thickness thrust washer. Common failure symptoms: a loud rattling noise from the transmission in neutral that disappears when reverse is engaged (worn idler gear needle bearing allowing gear oscillation), metal particles in the transmission oil with a needle-like shape (needle bearing roller spalling), and reverse gear grinding or failure to engage (idler gear teeth worn to a knife-edge profile from insufficient lubrication).

This YQX30-0013 idler gear fits A273 and A279 transmissions in 1.0-1.8 ton forklifts including Heli CPCD10-CPCD18 series. Verify your transmission model and gear part number before ordering. For related transmission gears, visit our Forklift Hydraulic Transmission section.

Technical Specifications

• Part Number: YQX30-0013
• Transmission: A273, A279 Series
• Material: 20CrMnTi, Case-Hardened HRC 58-62
• Bearing Type: Needle Roller, 0.02-0.04mm Clearance
• Shaft End-Play: 0.05-0.15mm (Thrust Washer Selected)
• Application: 1.0-1.8T Compact Forklifts

Compatible Forklift Models

Each gear is inspected for tooth profile and bearing bore dimensions, packed in rust-preventive packaging, and ships within 1-2 business days. 12-month warranty. Browse our Forklift Hydraulic Transmission catalog.