JLG G12-55A Service Manual - Manual (Page 114)

Engine
7-16 G10-55A, G12-55A
17. Install the engine cover and adjust.
18. Install and properly connect the battery. Install and
properly connect the second battery if equipped.
19. Check that all hydraulic system, electrical system,
cooling system, fuel system and exhaust system
connections are correct and connected tightly.
20. From within the cab, lightly depress the throttle pedal
to full-throttle position. As needed, adjust the limit-
stop screw until it touches the pedal bracket.
Note: Have an assistant stand by with a Class B fire
extinguisher.
21. Start the engine and run to normal operating
temperature then shut off the engine. While the
engine is cooling, check for leaks.
22. Allow the engine to cool. Check the radiator coolant
level and add coolant if required. Replace the
radiator cap.
23. Check for leaks from the engine, main hydraulic
pump and lines, transmission, hydraulic reservoir
and fuel tank. Check the levels of all fluids and
lubricants. Fill as required.
Note: During the full throttle check:
• DO NOT operate any hydraulic function.
• DO NOT steer or apply any pressure to the steering
wheel.
• Keep the transmission in (N) NEUTRAL.
24. Obtain and connect an appropriate engine analyzer
or tachometer. Check the engine rpm at full throttle.
25. Purge the hydraulic system of air by operating all
boom functions through their entire range of motion
several times. Check the hydraulic oil level.
26. Check for proper operation of all components.
27. Turn the engine OFF.
28. Install the oil pan cover underneath the engine
compartment.
29. Close and secure the engine cover.
30. Remove the Do Not Operate Tags from both the
ignition key switch and the steering wheel.