JLG Lull 1044C-54 II Series Service Manual page 92

Supply, Pressure, and Return Hydraulics
5-10
1. The machine must be parked on a level surface and the frame must be
level.
2. Retract all cylinders except frame tilt cylinder, apply the park brake,
and stop the engine.
3. Clean return filter housing (Item 1) and surrounding area.
4. Remove four (4) flange nuts (Item 2) that secure the filter housing
cover (Item 3). Set hardware aside on a clean surface.
5. Lift the cover (Item 3) and spring (Item 4) from housing (Item 1) and set
aside on a clean surface.
6. SLOWLY pour hydraulic oil into filter element (Item 5). It takes several
moments for oil to drain through the element. Continue to add oil until
HIGH mark is reached on hydraulic reservoir sight gauge.
7. Make sure the cover (Item 3) and spring (Item 4) are clean.
8. Place spring (Item 4) in position on filter element assembly (Item 5).
9. Place the cover (Item 3) in position and secure it to the filter housing
(Item 1) with four (4) flange nuts (Item 2). Torque nuts to 35 ft-lbs.
10. Start the engine and allow hydraulic system to warm up. Operate
controls gradually until you can fully extend and retract each cylinder,
including steering cylinders. This procedure removes air from the
system.
11. Retract all cylinders and stop the engine.
12. Recheck oil level and add oil as necessary.
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