PUMP GP-PISTON 3973967 - 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 Tank Oil
Change the Oil
Operate the machine long enough to warm the oil.The machine should be level. All implements lowered to ground with slight down pressure. Transmission lock lever and parking/secondary brake engaged, and the engine stopped. 1. Remove the hydraulic system oil tank filler cap. 2. Remove the remote tank drain plug. Allow the oil to drain.3. Change the hydraulic system filter. See "Hydraulic System" in the "Every 500 Service Hours or 3 Months" section.4. Remove the fill screen. Clean and install fill screen.5. Remove the pipe nipple and install drain plug.6. Fill the hydraulic system oil tank. See "Lubricant Viscosities and Refill Capacities."7. Inspect the filler cap gasket. Replace the gasket if damaged.8. Install the oil filler cap.9. Start and run the engine for a few minutes. 10. Maintain the oil level to the FULL mark in the sight gauge (1). Add oil through the fill tube (2), if necessary.11. Stop the engine.Differentials and Final Drives
Change the Oil
1. Position each wheel with the drain plug down. Remove the drain plugs and drain the oil. 2. Remove the front differential drain plug and allow the oil to drain. 3. Remove the rear differential drain plug and allow the oil to drain.4. Clean the differential and final drive drain plugs.5. Install the differential and final drive plugs. 6. Remove the front differential fill plug.7. Fill the front differential and the final drives through fill opening. See the "Lubricant Viscosities and Refill Capacities" chart. Clean and install the fill plug. 8. Remove the rear differential fill plug, located in the left rear of the rear axle housing.9. Fill the rear differential and final drives through the fill openings. See the "Lubricant Viscosities and Refill Capacities" chart. Clean and install the fill plug. To aid in filling the differential and final drive compartment, oil can be added through the oil level check plug in each wheel cover.10. If the complete amount of oil listed in the "Refill Capacities" chart will not go into the housing, install the plug. Run the machine on level ground a few minutes to equalize the oil in the differential and final drives.11. Remove the fill plug and add the remaining oil. 12. Operate the machine a few minutes and recheck the oil level. Oil should be to the bottom of the fill plug opening.If the oil level is above the fill plug opening, do not allow the oil to drain to the level of the plug opening. Install the fill plug. The oil level in the differential and final drive compartments can also be checked at the oil level plug in the wheel cover. Use the same method as when checking the oil level at the axle housing fill plug.13. Add oil, if necessary to bring the oil level to the bottom of the fill plug opening.Engine Valve Lash
Adjust
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