What type of oil should be used in a forklift transmission?
2 Answers
Heavy-duty gear oil or hydraulic transmission fluid should be used in a forklift transmission. Here are the relevant details: Types of forklift transmissions: Forklift transmissions are divided into two types. One is the traditional manual transmission, which has a gear structure inside with fewer gears, so gear oil can be used. However, since forklifts often operate in environments where they lift heavy loads, ordinary oil is insufficient, and heavy-duty gear oil must be used. Different transmission types require different oil specifications, and mixing different types is not allowed. The other type is the hydromechanical transmission, which is essentially a simple two-speed automatic transmission. The engine's power is transmitted to the transmission through a torque converter, and gear shifts are controlled hydraulically inside the transmission. It requires hydraulic transmission fluid for driving and lubrication. Never use ordinary transmission oil. Using the wrong oil can cause significant damage. The main functions of transmission oil: to keep the shifting system clean, lubricate the transmission components, and extend their lifespan. Regular maintenance is essential.
From my years of daily experience operating forklifts, transmission fluid should never be used carelessly. Our company uses automatic transmission fluid, specifically ATF Dexron III, because both manual and automatic transmissions in forklifts require lubrication, cooling, and gear protection. If you add the wrong oil or ordinary hydraulic fluid, the transmission may produce clicking noises, have difficulty shifting gears, or even overheat and get damaged. I once witnessed a colleague use a cheap substitute, which resulted in the entire transmission being scrapped, costing thousands in repairs. So before every oil change, I check the manual to ensure the correct fluid is used; I replace the fluid every 500 hours or six months, while also checking the fluid level and cleanliness. Proper maintenance not only extends the equipment's lifespan but also prevents unexpected downtime during work, which is especially crucial in a busy warehouse—otherwise, it can disrupt logistics efficiency.
