Relief Valve For Head End Of Tilt Cylinder

TM-5-3805-258-24-1 Loader Scoop Type DED 4x4 Articulated Frame Steer 2 1/2 Cubic Yard Bucket (CCE) Airborne/Airmobile Manual
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H Y D R A U L I C S Y S T E M TM 5-3805-258-24-1 T E S T I N G A N D A D J U S T I N G 2. After oil does not drain out of loosened plug (1), remove the plug. Install an 8J8559 Plug where plug (1) was removed. Install a 6V3965 Valved Nipple in the plug. Use a 6V4143 Coupler to connect a hose and pressure gauge (0 to 50000 kPa (0 to 7500 psi) to the valved nipple. 3. Start the engine and lift the lift arms until they are parallel with the ground. Move the tilt con- trol lever to DUMP position until the bucket is fully dumped. Release the tilt control lever. R E L I E F V A L V E F O R T H E R O D E N D O F T HE T I L T C Y L I N D ER 2. Cap (on relief valve). 4. Increase engine speed to high idle rpm. Look at the test gauge and move the lift control lever to RAISE position. The high reading on the test gauge is the pressure setting of the relief valve. The high reading on the test gauge must be 20 700 ± 340 kPa (3000 ± 50 psi). 5. If it is necessary to change the pressure setting of the relief valve, lower the bucket to the ground and stop the engine. 6. Remove cap (2) from the relief valve and turn the plunger either clockwise for an increase or counterclockwise for a decrease in the pres- sure setting of the relief valve. 7. When the pressure setting is correct, install cap (2) on the relief valve, remove the hose with the pressure gauge. The plug and valved nipple can be left on the machine. NOTE: The pressure setting of a new relief valve for the rod end of the tilt cylinder is 20700 ± 340 kPa (3000 ± 50 psi) with an oil flow of 38 ± 4 liter/ min (10 ± 1 U.S. gpm). NOTE: If a test is to be made for the relief valve for the head end of the tilt cylinder, do not install the cover over the control valve. Relief Valve For Head End Of Tilt Cylinder The relief valve for the head end of the tilt cyl- inder has a higher pressure setting than the main relief valve. Because of this high pressure setting an 8S3033 Electric Hydraulic Pump is used to test the relief valve. 1. Stop the engine. Loosen, but do not remove, plug (1) in the elbow to decrease the pressure of the oil in the lines to the head end of the tilt cylinder. R I G H T S I D E O F T I L T C Y L I N D ER 1. Plug in head end circuit. 2. Hose assembly to head end of tilt cylinder. After the oil does not drain out of loosened plug (1), remove the plug. Install an 8J8559 Plug where plug (1) was removed. Install a 6V3965 Valved Nipple in the plug. Use a 6V4143 Coupler to connect hose to the valved nipple. Install a tee (8), a 50,000 kPa (7500 psi) pressure gauge (3) with the necessary fittings to the hose assembly and the hose from the 8S3033 Electric Hydraulic Pump. T Y P I C A L G A U G E A N D F I T T I N GS 3. Pressure Gauge. 4. Coupler. 5. Coupler. 6. Adapter. 7. Nipple. 8. Tee. 9. Nipple. 4-77

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