Echo 72928 Owners Manual v.4 - Manual (Page 23)

20
6. Replace hydraulic pump belt. Readjust hydraulic
pump belt tension by sliding the hydraulic pump in
the mounting slots. Tighten bolts.
7. Replace belt guard.
8. Depress foot clutch pedal, start engine, release foot
clutch pedal to engage belt, and test unit. Readjust
pulleys and belt tension if needed.
3.1.5 Clearing Plugged Rotor
WARNING: 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.
Feeding too much chipable material at once may 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 two 3/8" retaining bolts holding the
access cover to the main frame assembly.
3. Lift up rotor access cover.
4. Clean the debris out of the chipper rotor. Turn the
rotor by hand to be sure it is free to rotate.
DANGER: Blades are sharp; avoid contact with
chipper blades.
5. Close rotor access cover and replace bolts.
6. Depress foot clutch pedal, and start engine. Release
foot clutch pedal when engine is running to engage
drive belt. Resume operation.
3.1.6 Repairing or Replacing Rotor
Bearings
1. Remove the two 3/8 inch retaining bolts holding
access cover to main frame assembly. Tilt access
cover over to allow rotor access.
2. Remove large belt guard (three 5/16 inch bolts).
3. Loosen bolts on hydraulic pump and remove hydrau-
lic pump belt. Using the push bolts from the bushing,
remove the bushing and pulley from the rotor shaft.
4. Lift belt idler pulley off drive belt and remove belt
from pulleys. Using the push bolts from the bushing,
remove the bushing and pulley from the rotor shaft.
S E C T I O N 3
WARNING: The rotor assembly has a lock
mechanism. When working on the rotor assembly,
use the lock mechanism at all times. Remove plastic
bearing cover under the chipper chute. There is a hole in
the rotor jack shaft and a matching hole in the bracket
mounted to the rotor bearing front side. Install a punch
through the rotor shaft and bracket to lock the rotor in
place.
5. If a rotor bearing needs repair, it is best to remove
the complete rotor assembly from chipper frame.
6. Using an overhead hoist or lifting device, remove the
four 1/2 inch bolts on each rotor bearing and lift the
rotor assembly completely out of the frame. The
complete rotor assembly is 275 lbs.
7. Once the rotor assembly is out of the frame, both
bearings can be removed by a puller and replaced
on the shaft.
8. Use the overhead hoist or lifting device to return the
complete rotor assembly to the chipper frame.
9. Install the four 1/2 inch bolts on each bearing to
secure them to the frame. Tighten bolts to 75 ft. lbs.
10. Replace drive belt on pulleys and lower belt idler.
Check alignment of pulleys and adjust engine if
needed.
11. 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 3.4, page 15).
12. Close cover and replace bolts.
13. Replace hydraulic pump belt. Readjust hydraulic
pump belt tension by sliding the hydraulic pump in
the mounting slots. Tighten bolts.
14. Replace belt guard and resume operation.
15. Depress foot clutch pedal, start engine, release foot
clutch pedal to engage belt, and test unit. Readjust
pulleys and belt tension if needed.