Cutting Unit Position Sensor - Toro Reelmaster 7000 Service Manual

Cutting Unit Position Sensor

The cutting unit position sensor is a normally open prox-
imity sensor that is located on the traction unit frame
(Fig. 36). The sensing plate that closes the sensor is a
gusset on the front right cutting unit (#5) lift arm.
When the cutting units are lowered, the gusset on the lift
arm is located near the position sensor and the sensor
closes. This closed sensor provides an input for the TEC
controller to allow the lowered cutting units to operate.
Sensor Testing
1. Park machine on a level surface, lower cutting units,
stop engine and engage parking brake.
2. Before disconnecting the cutting unit position sensor
for testing, the sensor and its circuit wiring should be
tested as a TEC input with the Diagnostic Display (see
Diagnostic Display in the Troubleshooting section of this
chapter). If the Diagnostic Display verifies that the posi-
tion sensor and circuit wiring are functioning correctly,
no further sensor testing is necessary. If, however, the
Display determines that the position sensor and circuit
wiring are not functioning correctly, proceed with test.
3. Turn ignition switch to the ON position and check
LED on cable end of cutting unit position sensor (Fig.
36). LED should be illuminated when the cutting units
are fully lowered. The LED should not be illuminated
when the cutting units are raised above the turn--around
position.
4. If the position sensor LED did not function correctly:
A. Make sure that the cutting unit position sensor is
properly adjusted (see Cutting Unit Position Sensor
in the Adjustments section of this chapter). If neces-
sary, adjust sensor and return to step 2 above.
B. Make sure ignition switch is OFF and disconnect
the cutting unit position sensor connector from ma-
chine wire harness.
C. Verify that the machine wire harness connector
terminal for black wire is closed (continuity) to
ground.
D. Turn ignition switch to the ON position (do not
start engine) and verify with a multimeter that ma-
chine wire harness connector terminal for pink wire
has system voltage (12 VDC) present.
E. If black wire is closed to ground, pink wire has
system voltage present and sensor LED did not func-
tion, replace cutting unit position sensor. Adjust sen-
sor after installation (see Cutting Unit Position
Sensor in the Adjustments section of this chapter).
Electrical System
5. If the cutting unit position sensor tests correctly and
a circuit problem still exists, check wire harness (see
Electrical Schematic and Wire Harness Drawings in
Chapter 9 -- Foldout Drawings).
6. Make sure that cutting unit position sensor is con-
nected to wire harness when testing is complete.
1. Position sensor
2. Sensor cable
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3
1
2
Figure 36
3. Lift arm (#5)
#1
#2 #3
CUTTING UNIT LOCATIONS
Figure 37
Reelmaster 7000
#5