Echo 72928 Owners Manual v.5 - Manual (Page 26)

9 INCH CHIPPER 24
SERVICE & MAINTENANCE
4.7 rePlacing roTor bearingS
Remove the two retaining bolts holding the access 1.
cover to main frame assembly. Tilt access cover over
to allow rotor access.
Remove large belt guard.
2.
loosen bolts on hydraulic pump and remove hydraulic 3.
pump belt.
Take the tension off the drive belt by depressing the
4.
belt engagement pedal. Then, remove the drive belt
from pulleys. Using the push bolts from the bushing,
remove the bushing and pulley from the rotor shaft.
Remove the four 1/2" bolts on each rotor bearing and
5.
take off the sensor bracket.
Using an overhead hoist or lifting device, lift the rotor
6.
assembly completely out of the frame. The complete
rotor assembly is 275 lbs.
Once the rotor assembly is out of the frame, remove
7.
both collars and bearings. Place new bearings on rotor
shaft. Reinstall front collar onto shaft.
Use the overhead hoist or lifting device to return the
8.
complete rotor assembly to the chipper frame.
Slide rotor back until the front collar is tight against the
9.
front bearing. Attach the front bearing to the frame with
four 1/2" bolts. Tighten bolts to 75 ft-lbs. Check and
adjust chipper anvil if needed. Bolt the rear bearing to
chipper frame. Reattach sensor bracket to rear bearing
using a top bearing bolt.
Slide rear collar on shaft against rear bearing. Make
10.
sure the collar bolt lines up with the sensor. Slide bush-
ing onto shaft with flange against collar and lock bush-
ing to shaft. Attach large pulley to bushing. Replace
drive belts on pulleys.
Check pulley alignment with a straight edge and adjust
11.
engine if needed. Check belt tension. Belt deflection
at the center of the belt should be 7/16" when a 20 lb.
load is placed against the belt (Figure 6.3).
Replace hydraulic pump belt. Readjust hydraulic pump
12.
belt tension by sliding the hydraulic pump in the mount-
ing slots. Tighten bolts.
Replace belt guard and resume operation.
13.
Depress belt engagement pedal, start engine, engage 14.
drive belt, and test unit. Readjust pulleys and belt ten-
sion if needed.
cauTion
Failure to maintain proper fastening torque on bolts
may result in damage to the chipper and/or personal
injury!
4.9 greaSeable bearingS
The chipper has seven greaseable bearings and pivots
that require grease every 25 hours:
• Two bearings on the rotor shaft.
• Two bearings on the hydraulic feed roller.
• One bushing on the belt engagement pedal pivot.
• One grease zerk on idler pivot.
• One grease zerk on discharge chute.
4.8 hYdraulic feed mainTenance
Check the reservoir daily for proper fluid level, the presence
of water (noted by a cloudy to milky appearance, or
free water in bottom of reservoir), and rancid fluid odor
(excessive heat).
The hydrostatic pump normally does not require regular
fluid changes. The system filter should be changed at
either 250 hour or annual intervals, whichever comes
first. The fluid and filter should be changed and system
cleaned if the fluid becomes contaminated with foreign
matter (water, dirt, grease, etc.) or if the fluid has been
subjected to temperature levels greater than the maximum
recommended.
4.10 Trailer mainTenance
Check wheel bolt torque every 10 hours of towing 1.
use.
Check air pressure in tires every 10 hours of towing.
2.
Check and repack wheel bearings with grease every 3.
year.
When towing, always connect the safety chains. Make
4.
sure trailer hitch bolts are tight and secure.
Check trailer lights.
5.