Lull 6K Service Manual - Manual (Page 173)

Supply, Pressure, and Return Hydraulics
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K 5-29
Checking Filter Element Condition
Fig. 5-20: Pressure Filter Service Indicator
Note: Not all pressure filter assemblies have a pressure filter service indicator.
Note: Check indicator with the engine on.
The pressure filter service indicator (1) is located on the top of the
pressure filter assembly.
The indicator shows the relative amount of restriction in the pressure filter
element.
When restriction is within acceptable limits, the green indicator (3) is fully
visible in the window (2). As contamination accumulates in the element,
the green indicator (3) will drop, exposing the red indicator (4). If the red
indicator (4) is exposed, the filter must be replaced.
FILTER OK SERVICE NEEDED
K1010 K1011
1
2 2 3
3
4