Echo 72928 Owners Manual v.7 - Manual (Page 18)

9 INCH CHIPPER 14
CONTROLS AND OPERATION
The lOFA control connects to the shaft sensor and solenoid
coil. The sensor (Figure 3.6) should be positioned 1/32"
from the rotor collar bolt. The solenoid coil is attached to
the crossover relief valve (Figure 3.7).
When the system senses that the rotor RPM has dropped
below a certain preset level, it will slow the hydraulic feed.
When the rotor RPM returns to a normal operating level,
the hydraulic feed will return to its previous rate.
3.6 eleCTroniC feeD SenSor
Figure 3.6, Proximity sensor
Figure 3.7, Crossover relief valve