MAINTENANCE Air Bleeding Procedures IMPORTANT: If the hydraulic pump is not filled with oil, it will be damaged when the engine is started. 5 The machine is equipped with two main pumps. Bleed air from these pumps after changing hydraulic oil. 1. Remove air bleed plugs (5) on each pumps. 2. Fill the pump with oil through air bleed plugs (5) port on each pumps until oil flows out of air bleed plug (5) hole. 3. Temporarily tighten air bleed plugs (5) on each pumps, start the engine and run at slow idle. Loosen one of air bleed plugs (5) slightly until oil flows from plug port to release trapped air completely. Tighten air bleed plug (5). Repeat this step for the rest of plugs. 4.
Purge air from the hydraulic system by running the en- gines at slow idle and operating the control levers slowly and smoothly for 15 minutes. M1U1-07-035 5. Position the machine as illustrated in the oil level check- ing procedure. 6. Lower the bucket to the ground. 7. Turn the auto-idle switch off. 8. Stop the engines. Remove the key from the key switches. 9. Pull the pilot control shut-off lever to the LOCK position 10. Check the hydraulic oil tank gauge. Remove cover (2) to add oil if necessary. 7-42