Echo 72854s - Manual (Page 27)

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7. Optional Electronic Feed
Sensor Installation
1. Remove belt guard.
If serial number is equal to or greater than 19317,
skip to step 9.
2. Loosen hydraulic pump mount and remove
pump drive belt.
3. Remove chipper drive belt.
4. Remove the pump and chipper-driven pulley
from the rotor shaft.
5. Replace collar (see figure 10.20) with the
sprocket and collar weldment supplied with the
valve kit.
6. Replace the chipper-driven pulley and pump
pulley.
Note: To maintain the chipper rotor position, push
the chipper pulley bushing tight against the collar
and the collar tight against the rotor bearing before
tightening.
7. Replace the chipper drive belt.
8. Replace the pump drive belt, position the pump
to tension the belt, and tighten the pump mount.
9. Attach the sensor and bracket under one of the
rotor bearing bolts so that it lines up with the
sprocket teeth (pickup should be approximately
.020" from the teeth of the sprocket). See figure
10.21.
10. Mount the speed switch bracket to the center bolt
in the chipper base. (Ref #6)
11. Replace the crossover relief valve with the new
valve suppled with the valve kit (serial number
less than 19317 only). (Ref #3)
12. Remove outer and inner plugs from the relief
valve. Install the solenoid cartridge valve and
coil so that the wires lead down (metal side of
valve coil towards relief valve).
13. Connect the solenoid valve and sensor to the
speed switch and attach the ground wires to the
frame. Route positive to engine (see wiring
diagram). (Ref #4)
14. Mount speed switch and route wires according to
wiring diagram.
15. Attach cover over speed switch with two self
tapping screws.
16. Replace the belt guard.
17. Attach the chipper to the tow vehicle.
18. Operate the chipper per manual instructions.
Note: When approaching the end of a log, it might
be necessary to manually override the automatic
feed sensor. Be sure to pay attention to the engine
speed and feeding of the material.
7.2 Operation of the Electronic Feed
Control
When the speed switch senses that the chipper rotor
has slowed to a certain preset level, the speed switch
will open the crossover valve and allow the oil to
return to the tank.
Operate the chipper as instructed in the chipper
manual. The feed control will start and stop the feed
roller automatically. To maximize performance, there
are two adjustments on the Speed Switch to tailor the
unit to your specific engine and needs.
1. The setpoint screw is used to determine the
engine RPM that the switch opens and halts the
feed.
The setpoint screw is used to adjust the RPM that
the feed roller turns off. Turning the screw
clockwise will increase the speed setting. The
setpoint is a very fine adjustment; it is not recom-
mended to go over 1/2 a turn each adjustment.
It is recommended to have this set so that the roller
shuts off when the engine speed is slightly higher
than the maximum torque speed of the engine.
2. The hysteresis is used to determine the amount
of recovery time the engine is allowed. This is
directly related to the setpoint setting.
Turning the screw clockwise will increase the
speed between when the roller stops and when it
turns on.
It is recommended to have this set at the minimum
by turning the screw counterclockwise
approximately 10 turns. If you don't seem to be
getting any adjustment, you have turned screw to
end of its range.
S
E C T I O N
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