GUARD-IDLER 1761281 - Caterpillar

(b) Remove positive (+) source voltage from terminal 1. Use a stop watch and check the time from the moment of removal to verify chart that follows: 3.(a) Apply positive (+) source voltage to terminal 2. If bench testing, Step 3 can be used as stated. When the unit is installed on the engine, all wires must be disconnected from Terminal 2 to prevent a direct short.Check the time from the moment voltage is applied to verify chart that follows (do not leave voltage on terminal 2 for more than 60 seconds): (b) Remove positive (+) source voltage from terminal 2. Check the time from the moment of removal to verify chart that follows: 4. Remove wire from terminal 4 and verify chart that follows: Instruments And Gauges
Oil Pressure Sending Units
SENDING UNIT FOR OIL PRESSURE
1. Terminal. 2. Fitting.1. Connect the sending unit to a pressure source that can be measured with accuracy.2. Connect an ohmmeter between fitting (2) and terminal (1).3. Take resistance readings at the pressure shown in the chart. 4. If a unit does not have the correct resistance readings, make a replacement of the unit.Water Temperature Sending Unit
1. Connect an ohmmeter between terminal (1) and nut (2). Put bulb (3) in a pan of water. Do not let the bulb have contact with the pan.2. Put a thermometer in the water to measure the temperature.
SENDING UNIT FOR WATER TEMPERATURE
1. Terminal. 2. Nut. 3. Bulb.3. Take resistance readings at the temperatures shown in the chart. 4. If a unit does not have the correct resistance readings, make a replacement of the unit.Electric Gauges
1. Put the gauge in position with the letters horizontal and the face 30° back from vertical.
WIRING DIAGRAM FOR TEST
1. Terminal (for test voltage). 2. Test resistance.2. Connect the gauge in series with the power source and the middle test resistance shown in the chart.3. Let the gauge heat at the middle resistance for 5 minutes, then check the pointer position for all of the resistances given. Mechanical Gauges For Temperature
To check these gauges, put the bulb of the gauge in a pan of oil. Do not let the bulb touch the pan. Put a thermometer in the oil to measure the temperature. Make a comparison of temperatures on the thermometer with the temperatures on the direct reading gauge.
DIRECT READING GAUGEMechanical Gauges For Oil Pressure
To check these gauges connect the gauge to a pressure source that can be measured with accuracy. Make a comparison of pressure on the gauge of test equipment with the pressures on the direct reading gauge.
DIRECT READING GAUGEPower Take-Off Clutches
Clutch Adjustment
1. Disconnect linkage (if so equipped) from the clutch lever.2. Use a torque wrench and apply torque to the splined clutch lever shaft until the clutch engages. Make reference to the chart to find the correct amount of torque needed for the clutch assembly. 3. If the torque needed to engage the clutch is not correct, make an adjustment as follows:4. Remove the inspection plate from the clutch housing.5.