ADAPTER 1138148 - Caterpillar

Illustration 1 g01141839
(7) Fan motor The fan motor is a typical piston motor with fixed displacement. The swashplate of the fan motor is at a fixed maximum position. Case drain oil from the fan motor is shared with the swing motors and the travel motors. Return oil from the motor is sent to the return filters and into the hydraulic tank. A internal check valve in the pump is used to supply makeup oil to the motor when flow from the pump is shut off. The makeup oil allows the motor to get oil when no flow is present in order to prevent the motor from spinning dry. The makeup oil prevents damage and premature wear.