Grove Published 11-10-2014, Control # 524-00 4-3
RT880E SERVICE MANUAL BOOM
NOTE: The boom assembly must be rotated 180° (upside
down) before performing any assembly or disas-
sembly procedures.
3. On the top front of the base section, remove the cap-
screws, flatwashers and cable pad.
4. Repeat step 3 on the inner mid.
5. Repeat step 3 on outer mid.
6. On the right side of the base section, remove the cap-
screw, two nuts, and the trigger weld from the brackets.
7. Remove the bolt, bolt insert and clamps securing the two
hydraulic tubes to the rear of the base section. Tag and
disconnect the two hydraulic tubes from the lower tele-
scope cylinder. Cap or plug all openings.
8. Remove the capscrews and washers securing the lower
telescope cylinder rod to the trunnion mounting plate at
the rear of the base section.
NOTE: The combined weight of the boom inner mid, outer
mid, and fly sections, including the telescope cylin-
ders, is approximately 21,342 lb (9680 kg).
9. Slide the assembly out of the base part way.
10. Remove the bolts and washers and the two set screws
and locknuts securing each front top wear pad to base
section. Remove two bolts and washers securing each
adjusting plate to top of base section. Remove two
adjusting plates. Remove upper wear pad assembly. If
necessary, remove four bolts securing front upper wear
pad to pad plate.
11. Remove the capscrews and washers securing the bot-
tom and side wear pad keeper plates to the bottom of
the base section. Remove the keeper plates.
12. Remove the capscrews and washers securing each
front top wear pad to the base section. Remove the wear
pads.
13. Remove the capscrews and washers securing the bot-
tom and side wear pad keeper plates to the inner mid.
Remove the keeper plates.
14. Lift up on the front of the inner mid and remove the bot-
tom and side wear pads and shims from the base sec-
tion, noting quantity, size, and location of shims.
15. Continue to pull the assembly from the base section
removing the top rear wear pads from the inner mid sec-
tion as they clear the base section. Support remaining
assembly on cribbing.
16. Remove the capscrews securing the rear side wear
pads to the inner mid section. Remove the wear pads
and shims, noting quantity and size of shims.
17. Remove the mounting plates from the lugs on the lower
cylinder rod.
18. Tag and disconnect the hydraulic hoses and tubes from
the telescope cylinders and the two cam valves. Cap or
plug all openings.
19. Remove the capscrews and washers securing each cam
valve to its mounting plate and remove the valves.
20. Place blocking under the lower cylinder barrel.
21. Remove the bolts and washer securing the lower cylin-
der barrel mounting plates to the inner mid.
22. Remove the capscrews and washers securing the upper
cylinder rod mounting plates to the inner mid.
23. On the left side of the inner mid, remove the valve
pusher rod.
24. On the right side of the inner mid, remove the valve
pusher rod. Disassemble as necessary.
25. Slide the assembly out of the inner mid part way.
26. Remove the bolts and washers and the two set screws
and locknuts securing each front top wear pad to base
section. Remove two bolts and washers securing each
adjusting plate to top of base section. Remove two
adjusting plates. Remove upper wear pad assembly. If
necessary, remove four bolts securing front upper wear
pad to pad plate.
27. Remove the capscrews and washers securing the bot-
tom and side wear pad keeper plates to the inner mid.
Remove the keeper plates.
28. Remove the capscrews and washers securing each
front top wear pad to the inner mid. Remove the wear
pads.
29. Continue to pull the assembly from the inner mid, remov-
ing the top rear wear pads from the outer mid as they
clear the inner mid. Support remaining assembly on crib-
bing.
30. Remove the capscrews securing the rear side wear
pads to the outer mid section. Remove the wear pads
and shims, noting quantity and size of shims.
CAUTION
Possible Equipment Damage!
A rollover fixture with webbing is recommended to rotate
boom and sections. Chains are not recommended. If a
rollover fixture is not available, rotate sections using
adequate support with webbing. Damage to the boom
may result from improper rotation.
A secure fixture that will prevent damage to the boom is
recommended to stabilize and hold the boom from moving
during removal of section or sections.
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