ENGINE AR-COMPL 20R0184 - Caterpillar

The design of the probe ends does not permit excessive torque; do not exceed 40 N m (30 lb - ft) torque when tightening.
(4) Check the 5P1719 Meter to make sure it is on zero with the power off. Adjust the thermistor thermometer battery voltage before each use. Turn selector knob (1) to "V. ADJ." and align needle with the mark on the meter face by turning slotted screw (2).(5) Refer to the following chart that lists system areas to be compared, expected temperature readings, problems and probable causes of the problems. To obtain accurate readings, measure temperatures during actual working conditions. If the machine is being tested in a rain-storm or partially submerged in water, the electrical connectors will tend to short out. To prevent this, apply a liberal quantity of 5N5561 Silicone Grease to the electrical connectors before the cable is attached to the thermistor probe.Calibration Instructions
The following conditions will make it necessary to calibrate the thermometer readout: Three to six months use of the thermistor thermometer; replacement of the 5P1719 Meter; thermistor thermometer has been dropped or otherwise damaged.(1) To calibrate the thermistor thermometer read-out, turn selector knob (1) to "OFF". The needle should be within one increment of the 0°C (32°F) mark. Turn slotted screw (2) until the needle is aligned with this mark.(2) Adjust the battery voltage. Turn selector knob (1) to "V. ADJ." and align the needle with the mark on the meter face by turning slotted screw (3).(3) Remove the panel from its case. Using a 1% tolerance resistor with a rating of 2000 ohms, turn selector knob (1) to an input position and connect the resistor to the corresponding input jack as shown. The meter should read 101°C (214°F).(4) If the temperature reading in Step 3 is not accurate, adjust potentiometer R6 (4) to get the correct calibration. Use an additional 10.00 K ohm 1% resistor to check instrument linearity. This resistor should produce a reading of 51-54°C (124-130°F); if not, replace the 5P1719 Meter.Troubleshooting The Electrical Components
This section is written as an aid for electronic technicians to troubleshoot the thermistor thermometer. It must not be used by service personnel with no training or knowledge of electronics. A circuit board illustration is included showing the position of each of the components. Also included is a schematic of the electrical circuit so the technician can easily follow the sequence of the circuit.Checking For Shorts In Battery Circuit
(1) Remove six screws and lift the panel out of the carrying case. Remove batteries (1). Check the batteries for corrosion or low voltage. Replace batteries as necessary. Check at locations (B) and (C) for broken or pinched wires. Check the battery solder tabs at location (A) for a short against either the battery mounting bracket or the carrying case. Bend the tabs if necessary and cut-off any excess wire or solder that is on the tab. Install the meter face panel in the carrying case. Check for, and correct, any interference at