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Rev. A
Groundsmaster 4000--D/4010--DPage 5 -- 46Electrical System
Engine Coolant and Hydraulic Oil Temperature Senders
The Groundsmaster 4000--D and 4010--D use two (2)
temperature senders as inputs for the TEC--5002 to
identify if either the engine coolant or hydraulic oil tem-
perature has reached an excessive level. These send-
ers are identical. The coolant temperature sender
threads into the radiator (Fig. 62). The hydraulic oil tem-
perature sender is attached to the hydraulic hydraulic
tube on the left side of the machine (Fig. 63).
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. 64).
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
ohms at 68
o
F(20
o
C).
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 9to11ft--
lb (12.3 to 14.9 N--m).
C. Reconnect harness wire to sender.
6. Check and fill system (coolant or hydraulic) to proper
level.
1. Radiator 2. Coolant temp sender
Figure 62
1
2
Figure 63
1. Hydraulic tube 2. Oil temp sender
FRONT
RIGHT
1
2
Figure 64