Echo 74520 Owners Manual v.1 - Manual (Page 23)

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4. Remove drive belt from pulleys.
5. Install new belt on pulleys and lower belt idler. Check alignment of pulleys and
adjust if needed.
6. Check belt tension before start-up. Adjust the eyebolt that anchors the idler spring
to adjust the belt tension. Tighten the eyebolt until the belt deflection at the center of
the belt is 7/16" when a 20 lb. load is placed against the belt (see figure 4). Move
the engine on the mounting stand if unable to attain proper tension.
7. Replace belt guard.
8. Depress foot clutch pedal, start engine, release foot clutch pedal to engage belt, and
test unit.
9. Readjust pulleys and belt tension if needed.
Feeding too much chipable material at once can plug the chipper. To clear plugged
rotor, proceed as follows:
1. Depress foot clutch pedal and stop engine. Release foot clutch pedal when engine
is stopped.
2. Remove the one 3/8" retaining bolt holding the access cover to the main frame
assembly.
3. Lift up rotor access cover.
4. Clean the debris from the chipper rotor. Release idler and turn the rotor by hand to
be sure it is free to rotate.
5. Close rotor access cover and replace bolts.
6. Depress foot clutch pedal, and start engine.
7. Release foot clutch pedal when engine is running to engage drive belt and resume
operation.
1. Remove the one 3/8 inch retaining bolt holding access cover to main frame
assembly. Tilt access cover over to allow rotor access.
2. Remove large belt guard (three or five 5/16 inch bolts).
3. Lift belt idler pulley off drive belt and remove belt from pulleys.
4. Remove the bushing and pulley from the rotor shaft using the push bolts from the
bushing.
5. Remove the two 1/2 inch bolts on each rotor bearing.
6. Pound 1/4" roll pin out of the rotor shaft on front bearing.
7. Lift the rotor assembly completely out of the frame with an overhead hoist or lifting
device. The complete rotor assembly is 140 lbs.
8. Remove both bearings with a puller when the rotor assembly is out of the frame and
place new bearings on rotor shaft.
If the machine becomes
plugged, depress foot
clutch pedal, shut off the
engine, and allow the
machine to come to a
complete stop before
clearing debris. Do not
operate the machine
without proper guards
and screens in place.
Service and Maintenance-Cont.
Clearing Plugged Rotor
Repairing or Replacing Rotor Bearings