Lull 6K Service Manual - Manual (Page 160)

Supply, Pressure, and Return Hydraulics
5-16 Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
Sight Gauge
Description
Fig. 5-10: Hydraulic Reservoir Sight Gauge
Note: When checking oil quantity, the machine must be on a level surface and the
frame must be level.
The hydraulic reservoir sight gauge is located on the side of the reservoir
(see Fig. 5-11, Item 1).
The hydraulic fluid level in the reservoir changes considerably during
operation and a reading should not be taken until the boom is lowered to
the ground, the parking brake is applied, the engine is stopped, and all
hydraulic pressure is released in the system. The hydraulic reservoir sight
gauge should then show the fluid level being near the high level. If
necessary, add hydraulic fluid, being careful not to overfill.
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