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Rev. A
Groundsmaster 4100--DPage 5 -- 36Electrical System
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 identi-
cal. The coolant temperature sender threads into the ra-
diator (Fig. 57). The hydraulic oil temperature sender is
attached to the hydraulic hydraulic tube on the left side
of the machine (Fig. 5 8).
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 o il with
a thermometer and slowly heat the oil (Fig. 59).
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 m e-
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 57
1
2
Figure 58
1. Hydraulic tube 2. Oil temp sender
1
2
Figure 59