MacDon R85 Rotary Disc 16 Foot Self-Propelled Windrower Headers - Manual (Page 156)

MAINTENANCE AND SERVICING
7.7.4 Header Drive Speed Sensor
The header drive speed sensor monitors the rotational speed of the bevel gearbox pulley and sends a signal to the
systems monitor in the Operator’s station to display disc speed.
The sensor does not require regular maintenance, and if it malfunctions or is damaged, it can be easily adjusted
or replaced.
Adjusting the Header Drive Speed Sensor
To adjust the gearbox speed sensor, follow these steps:
DANGER
Stop engine and remove key from ignition before
leaving operator’s seat for any reason. A child or
even a pet could engage an idling machine.
1. Lower header to ground, turn off engine, and
remove key.
2. Loosen bolts (A) and slide cover (B) off opening.
Figure 7.58
3. Check gap (E) between sensor (A) and pulley. If
required, adjust gap by loosening bolts (B) and moving
bracket (C) to achieve 0.08–0.12 in. (2–3 mm) gap (E).
When correct gap is achieved, tighten bolts (B).
4. Check position of sensor. If required, adjust position
by loosening bolt (D) and moving sensor to align it with
rim of pulley.
Figure 7.59
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Rev. F