JLG 1250AJP Service Manual - Manual (Page 27)

SECTION 1 - SPECIFICATIONS
3121171 – JLG Lift – 1-9
A - Red = Filter Restricted; Filter Bypassed
B - Green = Filter Good; Not Restricted
Figure 1-2. Hydraulic Return Filter Condition Indicator - Prior to S/N 139396
Red = Filter Restricted; Filter Bypassed
Green = Filter Good; Not Restricted
Figure 1-3. Hydraulic Return Filter Condition Indicator - S/N 139396 to Present