JLG 1850SJ Service Manual - Manual (Page 243)

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
3121619 – JLG Lift – 5-73
3. Adjustments Made at the Frame Valve Bank
AXLE EXTEND AND RETRACT, FRONT AND REAR
1. To extend the axles drive the machine back and forth
until extended. A machine that cannot be driven must
be jacked up.
2. On both the front and rear frame valve banks install a
high pressure gauge on ports “MA1” for retract and
“MA2” for extend. The gauge should read 2500 psi. for
both directions.
3. Turn clockwise to increase, counterclockwise to
decrease.