LEVER 1979461 - Caterpillar

You must read and understand the warnings and instructions contained in the Safety section of this manual before performing any operation or maintenance procedures.Hydraulic System
Change HYDO Oil and Suction Strainer
1. Place the machine on level ground and lower the bucket to the ground with the stick vertical, as shown above. 2. Steam clean the pump, hydraulic lines and hydraulic tank. 3. Remove the hydraulic tank pressure cap. 4. Remove the fill plug. 5. Oil drain valve is located under the hydraulic tank. 6. Remove the bolts, washers and hydraulic tank access cover from under the upper structure.7. Remove the oil drain valve plug.8. Install a pipe (with 1- 11 -1/2 NPSM threads) and hose to open drain valve. Drain into a container.9. Remove the pipe to close the drain valve.10. Inspect the O-ring and replace it if it is worn or damaged.11. Clean and install the plug. 12. Remove the plug from tube and allow oil to drain into a container.13. Inspect the O-ring and replace it if it is worn or damaged.14. Clean the plug. Install the plug and O-ring into the drain port. 15. Change the strainer. Removal and installation procedures are the same for changing the strainer as is given for cleaning the strainer in the Every 500 Service Hour or 3 Months section. 16. Fill the hydraulic system oil tank. See "Lubricant Viscosities and Refill Capacities."17. Inspect the fill plug O-ring for damage. Replace if necessary. Clean and install the fill plug. 18. Inspect, clean and replace the pressure cap, if damaged.19. Install the pressure cap. 20. Unlatch and open the side cover at the right of the machine. 21. Remove the pipe and fitting indicated by the arrow, and add oil up to the opening of the filler port.22. Reinstall the pipe and fitting correctly.23. Close and latch the side cover.24. Start and operate the engine at idling speed for five minutes. 25. Operate the control levers to allow the hydraulic oil to circulate through all hydraulic circuits. Then lower the bucket to the ground with the stick vertical to the ground, as shown above, and stop the engine. 26. Maintain the oil level between the marks on the dipstick in the appropriate temperature range.