Echo 77412 Owners Manual v.4 - Manual (Page 30)

4.5 INCH CHIPPER 28
SERVICE & MAINTENANCE
BEFORE INSpECTING OR SERvICING ANy pART OF THIS mACHINE, SHuT OFF pOWER SOuRCE,
DISCONNECT SpARk pLuG WIRE FROm SpARk pLuG AND mAkE SuRE ALL mOvING pARTS HAvE COmE TO A COmpLETE STOp.
Warning
rear drive belT
move the engagement lever to the RELEASE posi- 1.
tion.
Disengage pTO and shut off tractor engine.
2.
Remove the pTO shaft from the tractor and disconnect 3.
from the 3 point hitch.
Remove the forward belt shield by removing the eight
4.
5/16" x 3/4" bolts and washers securing the shield to
the chipper housing.
Loosen the eye bolt to release tension on the belt
5.
(Figure 30).
Remove the 3/8" x 3-1/2" hex bolt, washer and nut
6.
securing the idler pulley to the idler weldment. Remove
the idler pulley.
Remove the 3/8" x 4" hex bolt, washers, spacers and
7.
nylock nut securing the idler weldment to the chipper
housing. move the idler weldment out of the way.
Remove the old belt and install the new belt.
8.
Reattach the idler weldment to the chipper housing. 9.
Reattach the idler pulley to the idler weldment. 10.
Tighten the eye bolt until the belt deflection is 7/16" 11.
when a 20 lb. load is placed against the belt.
Reinstall the forward belt shield using eight 5/16" x
12.
3/4" bolts and washers.
Figure 30, Rear belt drive replacement
4.6.1 engine modelS
removing The old bearingS
1. place the chipper engagement lever in the START
position.
2. Shut engine off.
3. Disconnect battery cables (electric start models).
4. Remove the belt guard by removing the 5/16" bolts.
5. Remove the idler pulley.
6. place the chipper engagement lever in the CHIppING
position.
7. For models 77412 and 77412S, the belt guide will
have to be removed. To do this, remove the 1/2" bolt
attaching the belt guide to the rotor bearing and the
5/16" bolt attaching the belt guide to the engine.
8. Remove the belt.
9. To remove the rotor sheave, do the following:
9a. Remove the three bolts securing the rotor sheave
to the rotor shaft.
9b. Reinstall the bolts into the second set of holes.
Gradually tighten bolts equally to push the sheave
off the rotor shaft.
10. To remove the front bearing, do the following:
10a. Remove the snap ring.
10b. Loosen the setscrews securing the front bearing
to the rotor shaft.
10c. Remove the two 1/2" x 1-1/2" carriage bolts and
1/2" centerlock nuts holding the front bearing to
the chipper housing.
10d. Slide the front bearing off the rotor shaft.
10e. Remove the second snap ring.
11. To remove the back bearing do the following:
11a. Remove the seven 5/16" nylock nuts and wash-
ers securing the disk cover to the chipper hous-
ing. Remove the disk cover.
11b. Loosen the set screws securing the back bearing
to the rotor shaft.
11c. Remove the two 1/2" x 1-1/2" bolts and 1/2"
centerlock nuts holding the back bearing to the
chipper housing.
11d. Slide the chipper disk out from the chipper hous-
ing until the bearing slides off the rotor shaft.
4.5 drive belT rePlacemenT (conT.) 4.6 rePlacing roTor bearingS