JLG G12-55A Operator Manual - Manual (Page 142)

Section 7 - Lubrication and Maintenance
7-20 3126018
Hydraulic Return Filter (Before S/N 0160039451 excluding
0160039394 & 0160039397)
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 normal operating temperature.
3. Have an assistant open the engine cover.
4. With the engine at full throttle and the 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.
5. 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.
6. Close and secure the engine cover.
10
OW0970
OW1060
915 6-3 220 RE V A
2
1
OW0870