P.D. 11.07.2025
KMS Type 4×4 Transfer Case is used when a truck has both front and rear differentials and requires four-wheel drive. The 4×4 transfer case is mounted on the truck chassis between the main transmission and the rear differential. The input flange of the transfer case is directly connected to the driveshaft from the main transmission and transmits power to both the front and rear differentials through the lower output shafts, increasing the vehicle’s driving torque.
It is capable of converting existing 4×2 vehicles into 4×4 by adding front differential equipment. The KMS 300 Series 4×4 Transfer Cases are designed for off-road vehicles, rail line maintenance vehicles, and any other applications that require four-wheel drive.
Additionally, some of these transfer cases include a PTO output and are used on fire-fighting trucks. The KMS KTC.301 and KTC.6000 transfer cases feature PTO output capability.
KMS 300 Series Transfer Cases feature a differential locking system that allows the truck to continue driving without difficulty. When the differential lock is engaged, the front and rear differentials receive equal torque. When the differential lock is disengaged, torque is distributed to the differentials as needed.
These transfer cases can provide 100% of input speed during 4×2 drive mode. The KMS Transfer Case enables the truck to operate at two speed ranges: high gear and low gear.
In addition to all these features, the KMS Transfer Case KTC.306 includes a system that enables the vehicle to move continuously in reverse. This system allows the vehicle to drive backward at the required speed and gear while the main transmission remains in the normal forward-drive position.
The Transfer Case built on with lubrication system and preferably can be designed with the cooling system. The cooling system can be a heat exchanger or cooling fan. Engage/Disengage sensor can be installed on PTO output and main drive.
Cooling System With Oil Cooler Fan
Cooling System With Heat Exchanger
The transfer cases are shipped without oil. Oil must be filled into the transfer case using the designated oil filling mechanism before operating the vehicle. The oil filling operation should always be performed on level ground. The required oil level corresponds to the upper mark on the indicator. Only clean oil must be used.
Use only the recommended oil type — SAE 80W-90 EP or an equivalent oil. Using any oil other than the recommended type will void the warranty. Maintenance must be carried out on time, on level ground, and when the vehicle is not running.
If the oil level is below the required amount, add oil until it reaches the correct level. Ensure that the old oil is completely drained before refilling, and that only the recommended (correct) oil is used. Mixing old and new oil may cause serious damage to gearbox components such as shafts, gears, and bearings.
The first oil change must be performed after 250 operating hours from the initial start-up of the transfer case. Oil replacement should be carried out when the oil is cold. Draining can be done by removing the drain plug. To accelerate the process, it is also recommended to remove the filling plug. Before refilling, ensure that the drain plug is properly cleaned.
All subsequent oil changes should be performed every 1,000 operating hours or once a year, whichever comes first.
Check for oil leaks periodically. Check for any oil leaks in the area where the vehicle is operated and the surroundings. In case of detecting any oil leaks, prevent oil leakage, add oil if necessary, and contact us.
