Engine Coolant And Hydraulic Oil Temperature Senders - Toro Groundsmaster 4000-D Service Manual

Engine Coolant and Hydraulic Oil Temperature Senders

The Groundsmaster 4000--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 identi-
cal. The coolant temperature sender threads into the ra-
diator (Fig. 54). The hydraulic oil temperature sender is
attached to the hydraulic hydraulic tube on the left side
of the machine (Fig. 55).
Testing
1. Locate temperature sender that is to be tested. Dis-
connect wire harness connector from sender.
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. 56).
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 me-
ter will display a small resistance value (usually 0.5
ohms or less). This resistance is due to the internal re-
sistance 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
o o
ohms at 68 F (20 C).
B. The meter should indicate from 2.3 to 2.5 kilo
o o
ohms at 140 F (60 C).
C. The meter should indicate from 605 to 669 ohms
o o
at 212 F (100 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 9 to 11 ft- -
lb (12.3 to 14.9 N- -m).
C. Reconnect harness wire to sender.
Groundsmaster 4000--D
6. Check and fill system (coolant or hydraulic) to proper
level.
1
1. Radiator
1. Hydraulic tube
Page 5 - - 33 Rev. A
2
Figure 54
2. Coolant temp sender
1
2
Figure 55
2. Oil temp sender
Figure 56
Electrical System