806950 Mercruiser BREAKER, Circuit - 50 Ampere

Do not attempt to remove the main hydraulic pump with four nuts "X" that hold the pump to the adaptor and the flywheel housing. The bolts are required to be tightened from the coupling side of the adaptor, therefore the main hydraulic pump can only be removed by removing the bolts that hold the adaptor to the flywheel housing.
At operating temperature, the hydraulic oil tank is hot and under pressure. Hot oil can cause burns. To prevent possible personal injury, release the pressure in the implement hydraulic circuits (the boom, the stick and the bucket) before any of the hydraulic lines or any of the components are disconnected or removed.
1. Release the pressure in the implement hydraulic circuits (the boom, the stick and the bucket) before any of the hydraulic lines or any of the components are disconnected or removed. Release the pressure as follows:a. Shut off the engine and place key in the "ON" position. Put the hydraulic activation control lever in the "UNLOCK" position.b. Move the control levers for the boom, the stick and the swing to all full stroke positions. This will release any pressure that might be present in the pilot system.c. Return the key to "OFF" position.d. Slowly loosen the fill plug on the hydraulic tank, and release the pressure.e. Tighten the fill plug on the hydraulic tank.f. The pressure in the hydraulic system has been released, the lines and the components can be removed. Drain the hydraulic tank oil in a suitable container for storage or disposal.2. Drain the oil from the hydraulic oil tank into a suitable container for storage or disposal. The capacity of the hydraulic oil tank is 99 liters (26 U.S. gal). 3. Remove two bolts (1) and the washers that secure plate (2). Remove plate (2) from the machine. 4. Remove five bolts (3) and the washers that secure plate (4). Remove plate (4) from the machine. 5. Remove four bolts (5) and the washers that secure plate (6). Remove plate (6) from the machine. 6. Disconnect electrical connector (7) from the governor motor control. 7. Remove two bolts (8) and the washers that secure the governor cable clamp. 8. Remove two bolts (9) and the washers that secure the governor cable clamp. 9. Remove three bolts (12) and the washers that secure the governor motor control (10) to support (11).10. Remove three bolts (13) and the washers that secure support (11) to the machine. 11. Remove the final two bolts (14) and the washers that secure support (11) the machine. Remove support (11) from the machine. 12. Remove four bolts (15) that secure guard (16).13. Remove bolts (17) that secure wire clamp to guard (16). Remove guard (16). 14. Remove two hose assemblies (19) and (20) from pilot pump (18). 15. Remove five hose assemblies (21), (22), (23), (25), and (26) from the main hydraulic pump (24). 16. Disconnect electrical connector (27) from the main hydraulic pump (24).17. Remove bolt (28) and the washer that secures the wire clamp. 18. Remove hose assembly (29) from the main hydraulic pump (24).19. Remove four bolts (30) and the washers that secure the suction line to main hydraulic pump (24). 20. Attach a suitable lifting device to main hydraulic pump (24) and support the pump with a hoist.21. Remove 12 bolts (31) and the washers that secure main hydraulic pump adapter (32) to the flywheel housing of the engine.
Raise the main hydraulic pump slowly to check for additional lines or connections that could be damaged during the removal.
22. Carefully remove main hydraulic pump (24) from the machine. The weight of the main hydraulic pump is 120 kg ( 275 lb). The following steps are for the installation of the main hydraulic pump.23. Using a suitable lifting device install the main hydraulic pump in the machine. When installing the pump insure that the pump drive coupling is properly aligned with the engine. 24. Install 12 bolts (31) and the washers that secure main hydraulic pump adapter (32) to the engine flywheel housing. 25. Install four bolts (30) that secure the suction pipe to the main hydraulic pump (24).26. Connect hose assembly (29). 27. Install bolt (28) and the washer that secure the wire clip to the hydraulic pump (24).28. Connect electrical connector (27). 29. Connect five hose assemblies (21), (22), (23), (25) and (26) to the main hydraulic pump (24). 30. Connect two hose assemblies (19) and (20) to the pilot pump (18). 31. Install four bolts (15) and the washers that secure guard (16).32. Install bolt (17) and the washer that secures wire clip to guard (16). 33. Install five bolts (13) and (14) and the washers that secure support (11). 34. Install three bolts (12) and the washers that secure governor motor control (10) to support (11). 35. Install two bolts (9) and the washers that secure governor motor control linkage clip. 36. Install two bolts (8) and the washers that secure governor motor control linkage clip. 37. Connect electrical connector (7) to the governor motor control. 38. Install four bolts (5) and the washers that secure plate (6). 39. Install five bolts (3) and the washers that secure plate (4). 40. Install two bolts (1) and the washers that secure plate (2).