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Reelmaster 7000 Page 5 -- 39 Electrical System
Engine Temperature Sender
The engine temperature sender is located near the al-
ternatoron thewaterflange attachedtothe enginecylin-
der head (Fig. 57). There is a gray wire attached to the
terminal of the sender.
The resistance of the temperature sender reduces as
the engine coolant temperature increases. The chang-
ing resistance of the temperature sender signals the
console temperature gauge to indicate engine coolant
temperature during machine operation.
Engine Temperature Sender Test
1. Park machine on a level surface, lower cutting units,
stop engine, apply parking brake and remove key from
ignition switch. Open hood to gain access to engine.
CAUTION
Make sure engine is cool before removing the
temperature sender from engine.
2. Lower coolant level in the engine and remove the
temperature sender from water flange.
3. Put sender in a c ontainer of oil with a thermometer
and slowly heat the oil (Fig. 58).
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
NOTE: Prior to taking resistance readings with adigital
multi meter, short themeter testleads 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
fromfrom themeasured valueof thecomponentyou are
testing.
4. Check resistance of the sender with a multimeter
(ohms setting) as the temperature increases. Replace
sender if specifications are not met.
OIL TEMP
TEMP SENDER RESISTANCE
100
o
F(38
o
C) 460 ohms (approximate)
160
o
F(71
o
C) 140 ohms (approximate)
200
o
F(93
o
C) 54 to 78 ohms
221
o
F (105
o
C) 50 ohms (approximate)
5. Install sender to the water flange.
A. Clean threads of water flange and sender thor-
oughly. Apply thread sealant to the threads of the
sender.
B. Screwsender into the waterflange. Torque send-
er from 16 to 20 ft--lb (22 to 27 N--m).
C. Connect gray wire to sender. Apply skin--over
grease (Part Number TOR50547) to sender termi-
nal.
6. Fill engine cooling system.
7. Close and secure hood.
Figure 57
1. Temperature sender 2. Alternator
2
1
Figure 58
Electrical
System