966M XE and 972M XE Wheel Loaders Power Train, Steering, Braking, Hydraulic, and Machine Systems Caterpillar

Illustration 1	g03693622
(1) Hydraulic line from hydraulic oil cooler (2) Hydraulic line to hydraulic tank (3) Hydraulic lines to rear axle (4) Divider valve (5) Hydraulic lines to front axle (6) Heat exchanger

The axle oil cooler system consists of the following components: divider valve (4), two heat exchangers (6) and hydraulic lines (1, 2, 3, 5).

The rear axle has a temperature sensor which monitors the axle oil temperature. The contacts for the temperature sensor close when the axle oil reaches the actuation temperature of the sensor. The actuation temperature of the temperature sensor is 125° ± 3° C (257° ± 5° F). When the contacts of the temperature sensor close, an alert indicator in the cab will activate.

The hydraulic oil cooler core mounted on the back of the radiator group continuously supplies cool hydraulic oil to the axle oil cooler system. The hydraulic oil flows through hose assembly (1) to divider valve (4). At divider valve (4), the hydraulic oil flows to the front and rear axles through hydraulic lines (3, 5).

At each axle, the hydraulic oil flows through heat exchangers (6). Heat from the axle oil is transferred to the hydraulic oil in heat exchangers (6). Then, the hydraulic oil flows through hydraulic lines (3, 5) to divider valve (4). This oil flows through hydraulic lines (2) to the hydraulic tank.

Two bypass check valves for the axle oil cooler system are located in divider valve (4). The bypass check valves limit the oil pressure in heat exchangers (6). The bypass check valves are rated at 170 kPa (25 psi) at 0.95 L/min (0.25 US gpm). If the bypass check valves open, the hydraulic oil bypasses heat exchangers (6).