Toro 4100-D service manual Engine Coolant and Hydraulic Oil Temperature Senders

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. 58).

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. 59).

6.Check and fill system (coolant or hydraulic) to proper level.

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2

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 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 68oF (20oC).

B.The meter should indicate from 2.3 to 2.5 kilo ohms at 140oF (60oC).

C.The meter should indicate from 605 to 669 ohms at 212 oF (100oC).

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).

1

2

Figure 58

1. Hydraulic tube 2. Oil temp sender

C. Reconnect harness wire to sender.		Figure 59
Electrical System	Page 5 -- 36 Rev. A	Groundsmaster 4100--D