Lull 1044C-54 Series II Operation Manual - Manual (Page 131)

Section 7 - Lubrication and Maintenance
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Hydraulic Return Filter
A. Hydraulic Return Filter Indicator Check
1. Apply park brake, shift transmission to "Neutral" and lower forks or attachment
to horizontal position.
2. Check hydraulic return filter indicator with engine at normal operating
temperature.
3. With an assistant observing the indicator (2) located on the hydraulic return
filter (1), extend and retract the boom 10 to 12 ft (3,0 to 3,7 m). The bar gauge
should be within the green area.
4. Replace filter before the gauge reaches the red area on the indicator. If it
reaches the red area, the filter is too dirty and hydraulic oil is bypassing the
filter.
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OW0970
OW1060
OV0600
L O W
H I G H
1
2