caution - Toro

Engine Coolant and Hydraulic Oil Temperature Senders
The Groundsmaster 4100--D uses two (2) temperature
senders as inputs for the TEC--5002 to identify if either
the engine coolant or hydraulic oil temperature has
reached an excessive level. These senders are identical.
The coolant temperature sender threads into the radiator
(Fig. 57). The hydraulic oil temperature sender is
attached to the hydraulic hydraulic tube on the left side
of the machine (Fig. 58).
6. Check and fill system (coolant or hydraulic) to proper
level.
1
Testing
1. Locate temperature sender that is to be tested. Disconnect
wire harness connector from sender.
2
2. Thoroughly clean area around temperature sender
and remove sender.
3. Put sensing end of sender in a container of oil with
a thermometer and slowly heat the oil (Fig. 59).
Figure 57
1. Radiator 2. Coolant temp sender
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
NOTE: Prior to taking resistance readings with a digital
multimeter, short the meter test leads together. The meter
will display a small resistance value (usually 0.5
ohms or less). This resistance is due to the internal resistance
of the meter and test leads. Subtract this value
from from the measured value of the component you are
testing.
4. Check resistance of the sender with a multimeter
(ohms setting) as the oil temperature increases.
A. The meter should indicate from 11.6 to 13.5 kilo
ohms at 68 o F(20 o C).
1
2
Figure 58
1. Hydraulic tube 2. Oil temp sender
B. The meter should indicate from 2.3 to 2.5 kilo
ohms at 140 o F(60 o C).
C. The meter should indicate from 605 to 669 ohms
at 212 o F(100 o C).
D. Replace sender if specifications are not met.
5. After allowing the sender to cool, install sender:
A. Install new O--ring on sender.
B. Install sender into port and torque from 9to11ftlb
(12.3 to 14.9 N -m).
C. Reconnect harness wire to sender.
Figure 59
Electrical System
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Rev. A
Groundsmaster 4100--D