Echo 73454 Owners Manual v.3 - Manual (Page 30)

4 INCH CHIPPER 28
SERVICE & MAINTENANCE
4.6 rePlacing roTor bearingS
4.6.1 rePlacing engine model bearingS
Remove the 3/8 inch retaining bolt holding access
cover to main frame assembly. tilt access cover over
to allow rotor access.
Remove large belt guard.
depress belt engagement pedal, loosen engine bolts
and slide engine to loosen belt tension. then remove
drive belt from pulleys. using the push bolts from the
bushings, remove the bushings and pulleys from the
rotor shaft.
Remove the two 1/2" bolts on each rotor bearing and
remove the roll pin from the rotor shaft.
using an overhead hoist or lifting device, lift the rotor
assembly completely out of the frame. the complete
rotor assembly is 140 lbs.
once the rotor assembly is out of the frame, remove
both bearings and place new bearings on shaft.
Replace roll pin.
use the overhead hoist or lifting device to return the
complete rotor assembly to the chipper frame.
Slide rotor back until the roll pin is tight against the front
bearing. lock the front bearing and install the 1/2" bolts
on each bearing to secure them to the frame. tighten
bolts to 75 ft-lbs. Lock rear bearing. Check and adjust
chipper anvil if needed.
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Slide bushing onto shaft with flange against bearing
and lock bushing to shaft. attach large pulley to bush-
ing. Replace drive belts on pulleys, slide engine back
into place, and retighten bolts. Check alignment of
pulleys and belt tension. Adjust if needed.
Replace belt guard and resume operation.
Start engine, engage drive belt, and test unit. Adjust
pulleys and belt tension if needed.
4.6.2 rePlacing PTo model bearingS
Remove the 3/8 inch retaining bolt holding access
cover to main frame assembly. tilt access cover over
to allow rotor access.
Remove large belt guard.
Remove idler pulley and drive belts. using the push
bolts from the bushing, remove the bushing, spacer
and pulley from the rotor shaft.
Remove the two 1/2" bolts on each rotor bearing and
remove the roll pin from the rotor shaft.
using an overhead hoist or lifting device, lift the rotor
assembly completely out of the frame. the complete
rotor assembly is 140 lbs.
once the rotor assembly is out of the frame, remove
both bearings and place new bearings on shaft.
Replace roll pin.
use the overhead hoist or lifting device to return the
complete rotor assembly to the chipper frame.
Slide rotor back until the roll pin is tight against the front
bearing. lock the front bearing and install the 1/2" bolts
on each bearing to secure them to the frame. tighten
bolts to 75 ft-lbs. Check and adjust chipper anvil if
needed. lock rear bearing.
Slide spacer and bushing onto shaft with flange against
bearing and lock bushing to shaft. attach rotor pulley to
bushing. Replace drive belts and reinstall idler pulley.
Check alignment of pulleys and belt tension. Adjust if
needed.
Replace belt guard and resume operation.
Start tractor engine and engage pto drive clutch (see
tractor owner's manual). Increase engine speed to
rated PTO RPM Position. Test unit; readjust pulleys
if needed.
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4.5 clearing Plugged roTor
1. Shut off power source and disconnect spark plugs.
2. Remove the retaining bolt holding the access cover to
the main frame assembly and lift up access cover.
3. Clean the debris out of the chipping rotor. turn the
rotor by hand to be sure it is free to rotate.
4. Close rotor access cover and replace bolt.
5. Start engine and engage drive belt to resume opera-
tion.
Warning
If the machine becomes plugged, shut off power
source, disconnect spark plugs, and allow the machine
to come to a complete stop before cleaning debris. do
not operate the machine without proper guards and
screens in place.