JLG 340AJ Operation And Safety Manual page 40

SECTION 2 - USER RESPONSIBILITIES, MACHINE PREPARATION, AND INSPECTION
11. Have an assistant check to see that right front or left rear
wheel remains elevated in position off of ground.
12. Carefully activate Swing control lever and return boom to
stowed position (centered between rear wheels). When
boom reaches center, stowed position, lockout cylinders
should release and allow wheel to rest on ground, it may be
necessary activate Drive to release cylinders.
2-12
13. If lockout cylinders do not function properly, have qualified
personnel correct the malfunction prior to any further oper-
ation.
– JLG Lift – 3121258