Gradall 534B (9103-1390) Service Manual - Manual (Page 89)

HOW TO CHECK AND ADJUST
THE BOOM CABLE
12
THREE SECTION BOOM (RETRACTED)
THREE SECTION BOOM (PARTIALLY EXTENDED)
Two boom cables move the boom secitons. One
cable is fastened to the rear of the main boom and one
to the bottom side of the main boom.
Start engine and run the 3rd section boom all of the
way out, then retract it slightly. Stop Engine. Remove
the cover from the rear of the main boom and visually
check for any sag in the top cable.
If there appears to be excessive sag in the top boom
cable, tighten the rear cable anchor nut. Secure cable
with wrench to prevent it from twisting and tighten
the adjusting nut to approximately 75 foot pounds of
torque. Tightening the rear of the top cable will
automatically take up any slack in the bottom cable.
If total adjustment is taken from rear cable, use front
bottom cable adjustment.