JLG 1500SJ Service Manual - Manual (Page 326)

SECTION 4 - BOOM & PLATFORM
4-80 – JLG Lift – 3121262
4. If the Fly Boom needs extended:
a. Loosen the Fly Boom Retract Adjustment Nuts
by an amount equal to twice the distance the
boom needs to move to be in tolerance.
b. Extend the boom 3-4 feet (1-1.5m).
c. To remove the slack caused by the previous
step, tighten the Fly Boom Retract Adjustment
Nuts until they just contact the plate.
d. Fully retract the boom sections.
5. Verify that the exposed boom section dimensions
meet the dimensions and tolerances of Figure 4-22.,
Wire Rope Tensioning.
a. If the Fly Boom still does not fall within the
dimension and tolerance of Figure 4-22., repeat
the Fly Boom Section Repositioning procedure.
b. If the Fly Boom falls within the dimension and
tolerance of Figure 4-22., proceed to the Wire
Rope Tensioning Procedure.
Wire Rope Tensioning Procedure
NOTE: Verification of the rope tension should be determined
by proper function of the boom assembly and by the
dimensions and tolerances of Figure 4-22., Wire
Rope Tensioning.
REPEAT WIRE ROPE TENSIONING PROCEDURE ONLY AS NECES-
SARY TO ACHIEVE PROPER TENSION.
IF THE BOOMS HAVE BEEN PROPERLY POSITIONED AND THERE
IS NOT ENOUGH ADJUSTMENT REMAINING ON THE WIRE ROPES
TO ACHIEVE TORQUE, THE SERVICE LIFE OF THE WIRE ROPES
HAS BEEN CONSUMED. DO NOT PROCEED WITH THE REMAIN-
DER OF THIS PROCEDURE. REPLACE THE WIRE ROPES AND
SHEAVES.
1. Remove any covers necessary to access the wire
rope adjustment nuts.
2. If not already done, remove the lock plates and
nylon collar locknuts from the wire rope adjustment
nuts.
3. Position the boom so that it is horizontal within ±5°.
If the boom is below horizontal, ensure that the
boom is not on the boom rest.
4. Extend the boom so the platform moves 4 feet (1.3
m) from the fully retracted position. This is done to
position the boom so the ropes to be tensioned are
not under load.
5. When extending the boom in the previous step, if the
boom reaches the end of travel and then automati-
cally retracts a small amount, the ropes may still be
under load. If so, perform the following steps:
a. Note where the boom hits the end of stroke.
b. Retract 3-4 feet (1-1.3 m).
c. Extend the boom and stop just before the boom
hits the end of stroke.
Fly Boom Retract Adjusting
Nuts and Lock Plates