CAT’s Shifter Transmissions Target Vocational Market

Caterpillar is introducing a line of fully automatic, planetary transmissions designed specifically for vocational applications. Two models are slated to go into production later in 2005, with availability in 2006. The new transmissions are based on existing designs that have proven themselves in Caterpillar articulated trucks.

The 6-speed CX31 transmission will be compatible with Caterpillar C11, C13 and C15 engines, while the 8-speed super-heavy-duty CX35 will match up with higher horsepower C15 ratings for on highway
vocational trucks.

The CX31 transmission features six forward and one reverse speed and can accommodate up to 500 hp and torque of 1,650 lb-ft, matching up to the C11 engine at 370 hp, the C13 at 430 horsepower, and the C15 at up to 500 hp. There are three PTO locations with a rear PTO option producing up to 200 hp.

The super-heavy-duty CX35 transmission features eight forward speeds and one reverse and can accommodate up to 625 hp and torque of up to 2,050 lb-ft. This transmission, which will match up with the C15 engine for on-highway trucks, provides four potential PTO locations, including two optional rear PTOs with up to 200 hp available from each.

Both feature lock-up torque converters, and include optional hydraulic braking retarders and a transmission-mounted or remote-mounted oil filter. Both were designed with a narrow profile for easier packaging by OEMs and various body builders. Each uses the industry standard SAE J1939 communication protocol for improved data linking between critical components.

“When packaged with a Cat on-highway engine, these transmissions will give vocational truck customers the option of one source for a fully integrated power train, which means product support is greatly simplified,” says Caterpillar Group President Gerry Shaheen.

Warranty and extended service coverage for the transmissions will be matched to the engine.