PUMP GP-MAIN HYDRAULIC 1979996 - Caterpillar

Illustration 1 g00910203
The hydraulic tank is located on the right side of the machine. Press the button on breaker relief valve (1) in order to relieve any tank pressure.
At operating temperature, the hydraulic tank is hot and under pressure.Hot oil and components can cause personal injury. Do not allow hot oil or components to contact skin.Remove the filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. Remove the filler cap slowly to relieve pressure.
Slowly remove filler cap (2) .
Clean the filler strainer and the filler cap in a clean nonflammable solvent.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Illustration 2 g00622528
Remove the oil drain plug. The oil drain plug is located on the front of the hydraulic tank.
Attach a hose to a swivel. Install the swivel and the hose into the drain plug opening. A pipe nipple 10 cm (4 inch) and a hose can also be used. Use a 25.4 mm (1 inch) pipe with 1-11 1/2 NPTF threads. Do not tighten the pipe.
Rotate the swivel clockwise in order to open the internal drain valve. Allow the oil to drain into a suitable container.
Remove the swivel. The valve for the hydraulic tank will close.
Clean the drain plug and install the drain plug. Tighten the drain plug to a torque of 90 15 N m (65 10 lb ft).
Change the hydraulic oil filter. Reference: For the correct procedure, refer to Operation and Maintenance Manual, "Hydraulic System Oil Filter - Replace".
Install the filler strainer.
Fill the hydraulic oil tank. Reference: For the hydraulic tank capacity, refer to Operation and Maintenance Manual, "Capacities (Refill)".
Inspect the filler cap gasket. Replace the gasket if damage or wear is evident.
Install filler cap (2) .
Start the engine. Run the engine for a few minutes.
Illustration 3 g00581645
Maintain the oil level at the "FULL" mark on the sight gauge. Add oil, if necessary.
Stop the engine.