ENGINE AR 2666193 - Caterpillar

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.
To avoid system damage, make sure that the hydraulic pump is properly filled with hydraulic oil before start-up.
Illustration 1 g00377155
Pump compartment
(1) Vent plug
While the engine is stopped, remove vent plug (1) on the top of the main pump.
Stop the engine and slowly lower the boom until the bucket is on the ground. This pressurizes the hydraulic tank.
Fill the main pumps with oil.
Install vent plug (1). Tighten vent plug (1) and start the engine.
Place the engine at low idle position. Raise the boom and hold the boom in this position.
Stop the engine and slowly lower the boom until the bucket is on the ground. This pressurizes the hydraulic tank.
Slowly loosen vent plug (1) until oil begins to flow from the opening.
Tighten the vent plug to the specified torque.