9008-07
TM 5-2420-230-24-1
BOOM
Removal
16. Adjust the lifting equipment, if necessary, so that
the lifting equipment will hold the boom when the
1. Start the engine and run the engine at 1000 rpm
pivot pin for the rod eye of the boom cylinder is
(r/min). Roll the bucket in all the way.
removed.
2. Put the boom and the dipper in an acceptable
17. Fasten acceptable lifting equipment to the boom
position for removal of these parts. Make sure
cylinder to hold the boom cylinder when the pivot
that the bucket is on the floor.
pin is removed.
3. Stop the engine. Move the backhoe control
18. Remove the snap ring and the flat washer(s)
levers in both directions to relieve any pressure
from one end of the pivot pin for the boom
in the circuits.
cylinder.
4. For all machines except the 580M without
19. Drive the pivot pin out of the swing tower.
extendable dipper, disconnect the bucket cylinder
20. Lower the boom cylinder until the boom cylinder
hoses at the connections inside the upper end of
rests on the boom. Remove the lifting equipment
the boom. For 580M machines without
from the boom cylinder.
extendable dipper, disconnect the bucket cylinder
hoses at the bucket cylinder.
21. For 580 Super M and 590 Super M machines,
disconnect the backhoe hoses at the
5. Install caps or plugs on all hoses and tubes.
connections inside the lower end of the boom.
6. If the machine has an extendable dipper,
For 580M machines, disconnect the backhoe
disconnect the extension cylinder hoses at the
hoses at the backhoe control valve. Fasten an
connections inside the upper end of the boom.
identification tag to each hose.
7. Install caps or plugs on all hoses and tubes.
22. Install caps or plugs on all hoses and tubes.
8. Fasten acceptable lifting equipment to the dipper
23. On 580M machines only, remove the hardware
cylinder and to the boom or the dipper as
which fastens the vertical clamps near the center
necessary to hold these parts when the pivot pin
of the swing tower. Remove the vertical clamps.
is removed from the rod eye of the dipper
24. Adjust the lifting equipment, if necessary, to hold
cylinder.
the boom when the pivot pins for the boom are
9. Remove the snap ring and the flat washer(s) that
removed.
hold the pivot pin for the rod eye of the dipper
25. Remove the bolts, the hardened washers, and
cylinder.
the spacers that hold the pivot pins for the boom.
10. Drive the pivot pin out of the dipper.
26. Remove the pivot pins.
11. Lower the dipper cylinder to the boom.
NOTE: There maybe flat washers installed between
12. Adjust the lifting equipment, if necessary, so that
the boom and the swing tower. These flat washers fill
the lifting equipment will hold the boom and the
the gaps between the boom and the swing tower.
dipper when the pivot pin for the dipper is
The flat washers also keep the boom centered in the
removed.
swing tower. Put identification tags on these flat
washers so that they can be returned to the same
13. Remove the Self-Locking nut and the hardened
locations during installation.
washer that hold the pivot pin for the dipper.
27. Remove the boom from the machine. On 580M
NOTE: There may be one or more shims installed
machines, carefully pull the backhoe hoses from
between the hardened washer and the boom. If so,
the swing tower as you remove the boom.
record the number and the location of the shims so
that they can be returned to the correct location during
installation.
14. Drive the pivot pin out of the boom.
15. Move the dipper out of the way.
Bur 6-42130
Issued 3-01
Printed in U.S.A.