Instruksjonsbok Volvo A25D - A30D

Transmission

Volvo PowerTronic Volvo A25D and A30D are equiped with fully automatic Volvo PT 1560 planetary transmissions, with six forward gears and two reverse gears. Six forward gears optimize rimpull over the whole speed range for high performance and production. Two reverse gears provide high rimpull and high speed in reverse. A torque converter with lock-up is mounted between the engine and transmission. Rugged, heavy-duty planetary gears and clutch plates in the transmissions are designed for long service life. Torque converter (C) The torque converter features a built-in lock-up function. Torque amplification or speed difference between engine and transmission is only needed at the beginning of acceleration or when operating very slowly in rough off- road conditions. In all other operating conditions, a direct link, lock-up, is desirable between the engine and trans- mission to reduce power losses and fuel consumption. Automatic control of lock-up in combination with a well- matched torque converter gives optimized acceleration and low power losses as well as reduced fuel consump- tion. Automatic shift Automatic gearshifting makes the operator’s work much easier and the operator can concentrate on the job instead of shifting gears. This eliminates operator fatigue and increases safety and productivity. At the same time, the integrated transmission protection reduces the risk of operator error. A computer (ECU) controls shifting and lock-up functions according to operating conditions. The right gear will always be engaged which gives faster work cycles and lower fuel consumption.

Advantages • Planetary transmission with low power losses and long service life. • Fully automatic transmission is easy on the opera- tor and gives increased productivity. • Transmission protection functions increase safety and reduce the risk of operator error for longer transmission service life. • Torque converter with lock-up for fast acceleration, low power losses and better fuel economy.

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