Echo 77412 Owners Manual v.4 - Manual (Page 31)

4.5 INCH CHIPPER 29
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
inSTalling The neW bearingS
Slide the chipper disk into the chipper housing. 1.
As the rotor shaft slides through the hole in the chip- 2.
per housing, slide the new back bearing onto the rotor
shaft.
Tighten the two 1/2" x 1-1/2" carriage bolts and 1/2"
3.
centerlock nuts securing the back bearing to the chip-
per housing. Torque to 120 ft-lb.
Slide a snap ring, front bearing and another snap ring
4.
onto the rotor shaft.
Tighten the two 1/2" x 3/4" bolts and nuts securing the
5.
front bearing to the chipper housing.
Tighten the two set screws located on both the front
6.
and back bearings, securing the bearings to the rotor
shaft.
Reinstall bushing and sheave on rotor shaft.
7.
Replace the belt. using a straight edge, check the belt 8.
alignment. The rotor sheave and the engine sheave
must be flush.
For models 77412 and 77412S, reinstall the belt
9.
guide.
place the chipper engagement lever in the START
10.
position. Reinstall the idler pulley.
Reinstall the disk cover using seven 5/16" nuts and
11.
washers.
Replace the belt guard and resume operation.
12.
4.6.2 PTo modelS
removing The old roTor bearingS
move the engagement lever to the RELEASE posi- 1.
tion.
Disengage pTO and shut off tractor engine.
2.
Remove the front belt shield. 3.
Remove the front bearing snap ring. Then, remove the 4.
1/2" x 1-1/2" hex bolts that connect the front bearing
to the bearing support weldment.
Take off the bearing support weldment by removing
5.
four 3/8" nylock nuts.
Remove the front bearing snap rings and loosen the
6.
bearing set screw.
4.6 rePlacing bearingS (conT.)
Slide the front bearing off the rotor shaft. 7.
Remove the 3/8" x 3-3/4" hex bolt, washers and nylock 8.
nut securing the idler pulley to the idler bracket. Re-
move the idler pulley.
Remove the drive belt from the pulleys.
9.
using the push bolts from the bushing, remove the 10.
sheave and bushing from the rotor shaft.
Remove the 1/2" centerlock nuts holding the rear bear-
11.
ing to the chipper frame.
Remove the bearing snap rings and loosen the set
12.
screw. Slide the bearing off the shaft.
inSTalling The neW roTor bearingS
Slide a snap ring, rear bearing and another snap ring 1.
onto the rotor shaft. Tighten the set screw and install
the 1/2" hardware to connect the bearing to the chipper
frame. Torque to 120 ft-lbs.
Reinstall the bushing and sheave on the rotor shaft.
2.
Replace the drive belt. using a straight edge, check the 3.
belt alignment. The two sheaves must be flush.
With the engagement lever in the RELEASE position,
4.
reinstall the idler pulley.
Slide the front bearing and snap rings onto the rotor
5.
shaft.
Install the bearing support weldment with 3/8" hard-
6.
ware. Attach the front bearing to the support weldment
with two 1/2" x 1-1/2" bolts. Torque bearing bolts to 120
ft-lbs. Tighten the bearing set screw.
Reinstall the front belt shield.
7.
noTe
To replace any of the other four bearings on the pTO
chipper, use a method similar to the process in Section
4.6.2. However, these four bearings contain locking
collars. To loosen the lock collar, loosen the set screw and
insert a punch into the collar open hole. using a hammer,
tap the punch in the opposite direction of normal shaft
rotation. To install a new bearing, tighten the set screw
and tap the collar in the direction of shaft rotation.