JLG 340AJ Service Manual - Manual (Page 147)

SECTION 4 - BOOM & PLATFORM
3121259 – JLG Lift – 4-15
7. Remove the end cap (4) and carefully set aside for later
inspection.
8. Remove the stop tube (400) if the actuator is equipped
with one. The stop tube is an available option that limits
the rotation of the actuator.
9. Every actuator has two sets of small punched timing
marks that indicate timing between the gear sets. The
location and appearance of the marks can vary slightly
between models. One set indicates the timing between
the piston sleeve (3) and the housing (1) (upper photo),
the second set between the piston and the shaft (lower
photo). To ensure correct rotation and accurate end
positions, it is essential that the actuator be correctly
timed when it is reassembled. The punched timing
marks can be used, but it is easier to highlight punched
marks with a marker before disassembly as outlined in
the steps below.
10. Prior to removing the shaft (2), use a felt marker to
clearly indicate the timing between shaft and piston
sleeve (3). This will greatly simplify timing when the
actuator is reassembled.