OPERATION 3.7 ELECTRICAL EQUIPMENT IN CAB BASE Switch Board "X2" in Cab Base (continued) Service Switches for ”QMIN” and ”QMAX” Control of the Main Hydraulic Pumps (S150 and S151), illustration Z 22467 The Service switches ”S150” and ”S151” are used for testing and adjusting procedures of the hydraulic system and should only be operated through authorized service person- nel (S150) Service switch for Qmin position of main hydraulic pumps. When this switch is actuated, the main pumps remain in Qmin position i.e. minimum oil delivery to the hydraulic system. (S151) Service switch for Qmax position of main hydraulic pumps.
When this switch is actuated, the Qmin control is by- passed and the main pumps move to maximum delivery position. NOTICE Make sure that the switches (S150) and (S151) are switched off as soon as the testing and adjusting procedures of the hydraulic system are finished. Indicator Lights (H63), (H138), (H143.1) and (H143.2) (H63) Electronic pump control module (E32) active and program information. (H138) This light pulses if there is a failure in the electronic pump control module (E32) (H143.1 for rear engine 1) (H143.2 for front engine 2) Monitoring light of the automatic engine oil supply system "Reserve" G Steady light: oil is pumped from engine oil pan to reserve oil tank.
G Regular blinking: oil is pumped from reserve oil tank to engine oil pan. G Irregular blinking: oil is pumped in both directions, oil level in engine oil pan is correct. REMARK If the indicator lights (H143.1 and H143.2) are off with the engines running, there is a failure in the reserve systems. Have the reserve systems checked and repaired through authorized service personnel. 193 CAUTION