TM 5-3805-261-20PRINCIPLES OF OPERATION. (cont)1-30.GAGES AND INDICATORS (NON-ELECTRICAL). (cont)j.FuelLevelDipstick(Figure 1-64). Located in fuel fill opening. Calibrations show FULL, EMPTY, andpercentage of fuel in tank.Figure 1-64.1-31.BLADE SYSTEM. The blade system uses hydraulic cylinders and a hydraulic circle drive motor to move the blade.The hydraulic system provides power for the cylinders and motor. Refer to paragraph 1-29 for hydraulic system operationand location of components. The blade control levers are located at the sides of the steering console in the cab. Refer toparagraph 1-29 for description of control valve and lock deck valve. Refer to TM 5-3805-261-10 for blade operatinginstructions and exact location of operator’s controls. The blade centershift lock is powered by pressurized air. Refer toAppendix F, Section II, paragraph F-5.When the engine is running, the oil from the variable displacement pump goes through the relief and pressure reductionvalves, through lines to the control valves for the blade system cylinders. The pressure of the oil can get as high as thepressure setting of the relief valve. When the control valves for the blade system cylinders are not being used, thepressure of the oil is 2150 psi.When the engine is running and the cylinders are not being used, the pressure of the pump oil to the control valve isapproximately 2150 psi. The oil in lines and passage is open to the tank and the pressure of the oil in these lines is thesame as the oil in the tank. Lock check valve stops the oil in the lines between pressure reduction valve and cylinder andthe rod in the cylinder cannot move.When the blade control valve lever for the cylinder is held in the forward position, the pump oil goes through control valvethrough lines and lock check valve into the head end of cylinder. The oil in the head of cylinder pushes the piston and rodout of the cylinder which moves the blade. When more force is needed, there is an increase in the pressure of the pumpoil to the head end of cylinder. When the pressure of the pump oil goes to 1500 psi, the oil moves the shuttle valve in thepump and the oil pressure from the pump can go to approximately 3500 psi.1-52
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