4-47
Published 3/26/2018, Control # 596-05
GRT8100 SERVICE MANUAL BOOM
ensure all sections bottom out properly and do not drift
out when the hydraulic valve is in neutral.
NOTE: Add or remove shims as required so that stop
blocks on a given section (both sides) bottom out
on the next section at the same time.
a. If tele 3 bottoms out prior to tele 4, loosen tele 3
extend and retract cables. Extend and retract the
boom a few feet. Tighten tele 3 extend cables.
Extend the boom a few feet and tighten tele 3 retract
cables. Retract the boom fully. Repeat until the
section bottoms out properly. Re-torque the tele 3
retract cables and the tele 3 extend cables to verify
that the minimum torque value is achieved as
specified in Table 4-1.
b. If tele 3 does not bottom out completely, loosen tele
3 extend and retract cables. Extend the boom a few
feet. Tighten tele 3 retract cables. Retract the boom
a few feet and tighten tele 3 extend cables. Extend
and retract the boom a few times. Repeat until the
section bottoms out properly. Re-torque the tele 3
retract cables and the tele 3 extend cables to verify
that the minimum torque value is achieved as
specified in Table 4-1.
c. If tele 4 is fully retracting early, loosen the tele 4
extend and retract cables. Extend and retract the
boom a few feet. Tighten the tele 4 extend cables.
Extend the boom a few feet and tighten tele 4 retract
cables. Retract the boom fully. Repeat until the
section bottoms out properly. Re-torque the tele 4
retract cables and the tele 4 extend cables to verify
that the minimum torque value is achieved as
specified in Table 1.
d. If tele 4 does not bottom out completely, loosen tele
4 extend and retract cables. Extend the boom a few
feet. Tighten tele 4 retract cables. Retract the boom
a few feet and tighten tele 4 extend cables. Extend
and retract the boom a few times. Repeat until the
section bottoms out properly. Re-torque the tele 4
retract cables and the tele 4 extend cables to verify
that the minimum torque value is achieved as
specified in Table 1.
e. If tele 2 extends (drifts) back out after the hydraulic
valve is in neutral, extend the boom a few feet.
Loosen tele 3 retract cables slightly. Extend and
retract the boom a few times. If tele 2 continues to
drift out, extend and then retract the boom. Tighten
tele 3 extend cables slightly. Extend and retract the
boom fully. Repeat until tele 2 does not drift back
out.
f. Ensure all extend and retract cables achieve the
minimum torque value as specified in Table 4-1.
g. Add jam nuts and tighten. Coat threads with anti-
seize. All threaded cable ends must be equipped
with retainer nuts and jam nuts.
Table 4-1 Cable Tensioning Minimum Torque Values
Cables (Extend/Retract) Minimum Torque Values
Tele 4 Retract Cables 16 lb-ft (192 lb-in)
Tele 4 Extend Cables 10 lb-ft (120 lb-in)
Tele 3 Retract Cables 16 lb-ft (192 lb-in)
Tele 3 Extend Cables 15 lb-ft (180 lb-in)
All torque values shown are minimums and are calculated with the use of a standard
crow foot attached to the torque wrench in a straight-away position.
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