TRANSMISSION HYDRAULIC CONTROLSSYSTEMS OPERATIONTM 5-3805-263-14&P-2TRANSMISSION VALVESThis chart gives a description of the function of the transmission control valves.VALVEDIFFERENTIAL LOCKVALVE (9)MANUAL MODULATIONVALVE (14)DIFFERENTIAL, CHECKAND SAFETY VALVE (15)FUNCTIONControls the engaging of the differential clutch (on machines with adifferential).Lets the operator control P2 pressure to the directional clutches andmove the machine a little distance at a time.Controls the pressure difference between the speed and the directionalclutches.Opens a return passage to release the oil from behind the load pistonduring a shift.Keeps oil from going to the directional clutches if the machine isstarted in any speed except NEUTRAL.PILOT SELECTOR VALVE(16)Sends signal pressure to the two speed selector valves that are neededfor the selection of a specific speed.SPEED SELECTOR VALVE(17) (Two Position)Sends pressure oil to No. 4 clutch or to drain.SPEED SELECTOR VALVE(18) (Two Position)Sends pressure oil to No. 5 clutch or to the transmission reservoir.RELIEF VALVE (20)Keeps the system pressure at 340 psi (2335 kPa).COOLER BYPASS VALVE(24)Keeps the pressure in the cooler at 150 psi (1030 kPa).LUBRICATION RELIEFVALVE (25)Keeps the pressure of oil for lubrication at 75 psi (520 kPa).PRIORITY REDUCINGVALVE (29)Sends signal pressure to the pilot selector valve. After a signal pressureof 83 to 96 psi (570 to 660 kPa) is reached, pressure oil is then sent tothe system.MODULATING REDUCINGControls the increase of pressure in the directional and speed clutchesVALVE AND LOAD PISTONto gradually engage the clutches.(31 and 32)SPEED SELECTOR VALVE(36) (Two Position)Sends pressure oil to No. 3 clutch or to the transmission reservoir.SPEED SELECTOR VALVE(35) (Three Position)Sends pressure oil to No. 6 clutch or No. 7 clutch or it keeps oil fromgoing to the No. 6 clutch and No. 7 clutch.2-16
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
