SYSTEMS OPERATIONDIFFERENTIAL AND BEVEL GEARTM 5-3805-263-14&P-2DIFFERENTIAL LOCK VALVEThe electric differential control switch (18)controls a solenoid activated hydraulic valve lo-cated on the differential carrier. When switch (18)is in the off (LOCK) position, the indicator light(17) is off. No current flows to the solenoid coilconnector (16) and the valve is held open by springforce. P1 pressure oil from the transmission reliefvalve group flows through a hose to opening (15).The internal passages of the solenoid valve act as anorifice.When the differential control switch (18) is inthe on (UNLOCKED) position, the indicator light(17) is on and current flows to the solenoid coilconnector (16). The solenoid force then moves thevalve spool against its spring force. The pressure oilin cavity (2) goes through opening (11) to thereservoir. Pinions (7) and side gears (8) and (9) arenow free to turn when traction under each tandemis different.The differential with the electric control can belocked in any speed since the P1 pressure source istaken direct from the transmission relief valve.P1 oil goes into opening (15) and out opening(12) to the differential lock clutch. The oil goesinto the differential through the differential cageassembly to cavity (2) in the differential housing.The P1 oil pushes piston (1) against clutch plates(3) which cause side gear (9) to turn with bevelgear (4). Pinions (7) do not turn on spider (5) butturn with side gears (8) and (9).The speed of the wheels will be equal, even ifthe traction under each tandem becomes different.2-28
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