Echo 72928 Owners Manual v.4 - Manual (Page 22)

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S E C T I O N 3
Figure 3.3 Figure 3.4
(20 lbs.)
7/16" Deflection
Rotor Housing
Chipper Anvil
Spacer
3.1.3 Adjusting Drive Belt
Check the condition of the drive belt annually or after
every 25 hours of operation, whichever comes first. If
the belt is cracked, frayed, worn, or stretched, replace it.
Only replace belt with original banded type belt, do not use
single type belts. To adjust the belt, proceed as follows:
1. Depress foot clutch pedal. Shut engine off and
disconnect battery cables.
2. Remove large belt guard (three 5/16 inch bolts).
3. 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).
4. Replace belt guard.
5. Start engine and test belt for looseness. Replace the
belt if no adjustment is left.
3.1.4 Replacing Drive Belt
1. Remove large belt guard (three 5/16" bolts).
2. Loosen bolts on hydraulic pump and remove belt.
3. Lift belt idler pulley off drive belt and remove drive
belt from pulleys.
4. Install new belt on pulleys and lower belt idler.
Check alignment of pulleys and adjust if needed.
5. 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).
• The base of the cutting edge is worn or has been re-
sharpened so that it is too close to the rotor chipping
slot.
3.1.2 Setting Chipping Blade Clearance
The four chipping blades should clear the chipper anvil
located directly under the chipper chute by 1/16 inch to
1/8 inch. The chipper anvil is adjustable and reversible.
To adjust:
1. Lift rotor access cover and expose rotor (see figure
3.2). Loosen the three 1/2 inch bolts that hold the
chipper anvil to the frame (see figure 3.3).
2. Measure the amount of clearance between chipping
blade and chipper anvil from inside of housing.
3. Adjust inward or outward to desired measurement.
4. Tighten bolts on chipping block to 75 ft. lbs. and
resume operation.
If chipper anvil edge is damaged or worn unevenly,
remove the three bolts holding the anvil and use one of
the other three edges. Adjust for correct measurement.