Echo 77412 Owners Manual v.5 - Manual (Page 29)

4.5 INCH CHIPPER 27
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
Figure 29, Front belt drive replacement
4.5.1 engine modelS
place the chipper engagement lever in the START
position.
Shut engine off.
Disconnect battery cables (electric start models).
Remove the belt guard by removing the 5/16" bolts.
Remove the idler pulley.
place the chipper engagement lever in the CHIppING
position.
Loosen the four carriage bolts attaching the engine
plate to the trailer.
Locate the two 5/16" x 3" bolts and 5/16" nuts located
on the side of the chipper between the trailer and the
engine plate.
Loosen both 5/16" flange nuts.
To release the tension on the belt, loosen both 5/16"
x 3" bolts equally and slide the engine towards the
chipper housing.
Remove the old belt and install the new belt. Loosen
the belt guide if needed.
Adjust the drive belt (Section 4.4).
position the belt guide 1/8" over the belt and tighten
bolts.
place the chipper engagement lever in the START
position. Reinstall the idler pulley.
Reinstall the belt guard.
4.5.2 PTo modelS
fronT drive belT
move the engagement lever to the RELEASE posi-
tion.
Disengage pTO and shut off tractor engine.
Remove the pTO shaft from the tractor and disconnect
from the 3 point hitch.
Remove the four 5/16" x 5/8" hex bolts and four 5/16"
x 3/4" hex bolts securing the front belt shield to the
chipper housing. Remove the shield and set aside.
Remove the front bearing snap pin. Then, remove the
1/2" x 1-1/2" bolts that connect the front bearing to the
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4.5 drive belT rePlacemenT
bearing support weldment.
Remove the four 3/8" x 1" carriage bolts, washers and
nylock nuts securing the bearing support weldment
to the chipper housing. Remove bearing support
weldment and set aside.
Loosen the eye bolt to release tension on the belt
(Figure 29).
Remove the 3/8" x 3-3/4" hex bolt, washers and nylock
nut securing the idler pulley to the idler bracket. Re-
move the idler pulley.
Remove the old belt and install the new belt.
Reattach the idler pulley to the idler bracket.
Tighten the eye bolt until belt deflection is 7/16" when
a 20 lb. load is placed against the belt (Figure 28).
Slide the bearing support weldment onto the rotor
shaft. Secure the weldment to the chipper housing
with four 3/8" x 1" carriage bolts, washers and nylock
nuts. Attach the front bearing to the weldment with two
1/2" x 1-1/2" bolts, washers and nuts. Tighten bearing
bolts to 120 ft-lbs.
Reinstall bearing snap ring.
Reinstall the front belt shield using four 5/16" x 5/8"
hex bolts, four 5/16" x 3/4" hex bolts and eight 5/16"
flat washers.
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