OPERATION 3.6 POWER HOUSE 3.6.2 CONTROL AND FILTER PANEL OF REAR- AND FRONT POWER UNIT Legend for illustration Z22479 (Rr.1) Control and filter panel of rear power unit, engine 1 (Fr.2) Control and filter panel of front power unit, engine 2 (1) Change over valve for operation mode of pump con- trol system for rear power unit, engine 1. (2) Change over valve for operation mode of pump con- trol system for front power unit, engine 2. (3) Pressure oil filter for fan drive hydraulic motor of coolant radiator for rear engine "1". Filter restriction monitored by differential pressure switch B21-1. (4) Pressure oil filter for pump distributor gear PTO "1" lubricating oil.
Filter restriction monitored by differen- tial pressure switch B27-1. (5) Pressure oil filter for fan drive motor of hydraulic oil cooler "1". Filter restriction monitored by differential pressure switch B28-1. (6) Pressure oil filter for pilot- and pump control oil cir- cuit. Filter restriction monitored by differential pres- sure switch B22. (7) Pressure oil filter for fan drive hydraulic motor of coolant radiator for front engine "2". Filter restriction monitored by differential pressure switch B21-2. (8) Pressure oil filter for pump distributor gear PTO "2" lubricating oil. Filter restriction monitored by differen- tial pressure switch B27-2.
(9) Pressure oil filter for fan drive motor of hydraulic oil cooler "2". Filter restriction monitored by differential pressure switch B28-2. Operation Modes of Pump Regulation System The standard operation mode of the pump control system is the Electronic Operation Mode. For testing purposes the pump control system can be changed to the hydraulic operation mode. In case of a failure in the electronic control system the hydraulic operation mode can also be used for emergency operation. The lever positions for electronic and hydraulic operation mode are marked with corresponding symbols at levers (1) and (2). 187