Echo 73454 Owners Manual v.3 User Manual

Page 29

4 INCH CHIPPER

SERVICE & MAINTENANCE

4.4 adJuSTing/rePlacing drive belT

Check the condition of the drive belt annually or after every
25 hours of operating, whichever comes first. If the belt is

cracked, frayed, or worn, replace it. To replace or adjust
drive belt, proceed as follows:

4.4.1 engine model drive belT

Shut off engine and disconnect spark plugs.

Remove belt guard.

take the tension off the drive belt by depressing the
belt engagement pedal, loosening the engine bolts,
and sliding the engine back. then, remove the drive
belt from pulleys (Figure 4.4).

Install the new belt on pulleys. Slide engine back into
place and tighten bolts to proper torque.
Check pulley alignment with a straight edge and adjust
if needed.

Figure 4.6, Belt tension

Figure 4.5, PTO model drive belts

Figure 4.4, Engine model drive belt

4.3 SeTTing blade clearance (conT.)

To adjust chipping anvil:

1. lift rotor access cover and expose rotor. loosen the

two 1/2 inch bolts that hold the chipper anvil to the
frame.

2. Measure the amount of clearance between chipping

blade and chipping anvil from inside of housing.

3. Adjust inward or outward to desired measurement.

4. tighten bolts on chipping anvil to 75 ft-lbs. Make sure

all blades clear the anvil by 1/16" to 3/16" before op-
erating.

If the chipping anvil edge is damaged or worn unevenly,
remove the two bolts holding the anvil and use one of the

other three edges. Adjust for correct measurement.

Check belt tension and adjust if needed. The belt de-
flection at the center of the belt should be 7/16" when
a 20 lb. load is placed against it (see Figure 4.6).

Reinstall belt guard.

depress belt engagement pedal, start engine, engage

drive belt, and test unit. Readjust pulleys if needed.

4.4.2 PTo model drive belTS

disengage pto and shut tractor engine off.

Remove belt guard.

Remove idler pulley by removing its 1/2" x 4-1/2" bolt,
spacers, washer and nut. take the drive belt off the
pulleys (Figure 4.5).

Install the new belts and reinstall idler pulley.
Check pulley alignment with a straight edge and adjust
if needed.
Check belt tension and adjust if needed. The belt de-
flection at the center of the belt should be 7/16" when
a 20 lb. load is placed against it (see Figure 4.6).

Reinstall belt guard.

Start tractor engine and engage pto drive clutch
(see tractor owner's manual). Increase engine speed

to rated PTO RPM. Test unit and adjust pulleys if
needed.