Echo 74520 Owners Manual v.2 - Manual (Page 25)

Page 21 5" Chipper W/Hyd. Feed Owners Manual
Service and Maintenance
5.6 REPLACING DRIVE BELTS (TOW-
ABLE MODELS) 5.7 REPLACING DRIVE BELTS (PTO
MODELS)
Check the condition of the drive belt annually or after every
25 hours of operation, whichever comes first. Replace
cracked, frayed, worn, or stretched drive belt. Only
replace drive belt with original banded type belt, do not use
single type belts. To adjust the drive belt, proceed as
follows:
1. Depress foot clutch pedal.
2. Shut engine off.
3. Disconnect battery cables.
4. Remove large belt guard (three 5/16 inch bolts).
5. Adjust the eyebolt that anchors the idler spring to
adjust the belt tension.
6. 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 Fig. # 12).
7. Replace belt guard.
8. Start engine and test belt for looseness.
9. Replace the belt if no adjustment is left.
1. Remove large belt guard (three 5/16" bolts).
2. Loosen eye bolt.
3. Push belt idler pulley off drive belt.
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 Fig. # 12). 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.
Fig. # 12, Belt tension
20 lbs
7/16" Deflection