Echo 72854s - Manual (Page 23)

19
2. Remove large belt guard (three 5/16 inch bolts).
3. Loosen bolts on hydraulic pump and remove
hydraulic pump belt. Using the push bolts from
the bushing, remove the bushing and pulley
from the rotor shaft.
4. Lift belt idler pulley off drive belt and remove
belt from pulleys. Using the push bolts from the
bushing, remove the bushing and pulley from the
rotor shaft.
Warning: The rotor assembly has a lock
mechanism. When working on the rotor
assembly, use the lock mechanism at all times.
Remove plastic bearing cover under the chipper
chute. There is a hole in the rotor jack shaft and a
matching hole in the bracket mounted to the rotor
bearing front side. Install a punch through the rotor
shaft and bracket to lock the rotor in place.
5. Remove the four 1/2 inch bolts on each rotor
bearing and remove the punch used to lock the
rotor.
6. Using an overhead hoist or lifting device, lift the
rotor assembly completely out of the frame. The
complete rotor assembly is 275 lbs.
7. Once the rotor assembly is out of the frame,
remove 3/8" bolts and collar from front. Remove
both bearings with a puller and place new
bearings on rotor shaft. Replace collar.
8. Use the overhead hoist or lifting device to return
the complete rotor assembly to the chipper
frame.
9. Slide rotor back until front collar is tight against
the front bearing. Lock the front bearing and
install the four 1/2 inch bolts on each bearing to
secure them to the frame. Tighten bolts to 75 ft.
lbs. Check and adjust chipper anvil if needed.
Lock rear bearing.
10. Slide rear collar on shaft against rear bearing.
Slide bushing onto shaft with flange against
collar and lock bushing to shaft. Attach large
pulley to bushing. Replace drive belt on pulleys
and lower belt idler. Check alignment of pulleys
and adjust engine if needed.
11. Check belt tension before start-up. Adjust the
eyebolt that anchors the idler spring to adjust the
belt tension. Tighten the eyebolt until the belt
deflection at the center of the belt is 7/16" when
S E C T I O N 5
a 20 lb. load is placed against the belt (see figure
10.18).
12. Close cover and replace bolts.
13. Replace hydraulic pump bushing and pulley.
Replace hydraulic pump belt. Readjust hydraulic
pump belt tension by sliding the hydraulic pump
in the mounting slots. Tighten bolts.
14. Replace belt guard and resume operation. Read-
just pulleys and belt tension if needed.
5.10 Adjusting the Hydraulic Feed
Control Cable
Figure 10.19 shows the hydraulic feed control cable
assembly and the detent position slots. The cable is
attached and adjusted from the factory, but it should
be checked and adjusted as needed before use. The
hydraulic feed control lever has three positions:
Forward (lever moved toward the operator)
Neutral (lever in center position)
Reverse (lever moved away from operator; reverse
has no detent position)
When the operator moves the control lever to the
neutral position, the detent ball should be positioned
in the rear detent slot (see figure 10.19). The feed
roller should come to a complete stop when the
control lever is in the neutral position. If it does not
stop, adjust the clevis assembly on the control cable
as follows:
1. If the control lever is in neutral and the roller
creeps forward, the cable is too short; adjust it to
a longer length.
2. If the roller creeps in a reverse direction, the
cable is too long; adjust it to a shorter length.
3. Adjust the cable as needed to compensate for
cable stretch.
5.11 Greaseable Bearings and Pivots
Engine Models: The engine model chippers have
five greaseable bearings and pivots that require
grease every 50 hours:
• Two bearings on the rotor shaft
• One greaseable bushing on the foot pedal pivot