Ametek 387 - Page 4

iv 072-40245 B
3.6.4 Tachometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
3.6.4.1 Ammeter....................................................................................................................3-9
3.6.4.2 Voltmeter .................................................................................................................3-10
3.6.4.3 Pyrometer................................................................................................................3-11
3.6.4.4 Transmission and Axle Temperature Gauges ...........................................................3-12
3.6.4.5 Fuel Level.................................................................................................................3-13
3.7 Backlighting . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
4 Service Procedures 4-1
4.1 Some Important Dos and Donts . . . . . . . . . . . . . . . . . . . . 4-1
4.2 Replacing the Speedometer and Tachometer . . . . . . . . . . . . . . . . . 4-1
4.3 Servicing the Two-Inch Gauges . . . . . . . . . . . . . . . . . . . . . 4-2
4.3.1 Removal and Reinstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.3.2 Disassembling a Two-Inch Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.3.3 Reassembling a Two-Inch Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.4 Reprogramming a Two-Inch Gauge . . . . . . . . . . . . . . . . . . . . 4-5
4.5 Servicing the Interface Module . . . . . . . . . . . . . . . . . . . . . 4-5
4.5.1 Removing the Interface Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4.5.2 Reinstalling the Interface Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4.5.3 Reprogramming the Interface Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4.6 Spare Parts Listing . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
5 Troubleshooting Procedures 5-1
5.1 Required Test Equipment . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.2 Troubleshooting Procedure Start Point . . . . . . . . . . . . . . . . . . . 5-2
5.2.1 The Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
5.3 Troubleshooting Procedures for Two-Inch Gauges . . . . . . . . . . . . . . . 5-4
5.3.1 Two-Inch Gauge Fails Initialization, No Pointer Movement, LED Never Lights. . . . . . . . . 5-5
5.3.2 Two-Inch Gauge Passes Initialization but LED Flashes . . . . . . . . . . . . . . . . . . . . 5-6
5.3.2.1 Air and Fuel Pressure Gauges....................................................................................5-7
5.3.2.2 Temperature Gauges..................................................................................................5-9
5.3.2.3 J1708 Data Bus Gauges ..........................................................................................5-11
5.3.2.4 Vacuum Gauges.......................................................................................................5-11
5.3.2.5 Voltmeter Gauge ......................................................................................................5-13
5.3.2.6 Ammeter Gauge.......................................................................................................5-14
5.3.2.7 Fuel Level Gauge......................................................................................................5-16
5.3.2.8 Pyrometer................................................................................................................5-17
5.4 Troubleshooting Procedures for the SMC. . . . . . . . . . . . . . . . . . 5-19
5.4.1 SMC Pointer Never Moves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-20
5.4.2 Speedometer and Odometers Inaccurate . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21
5.4.3 Speedometer Accurate, Odometer Inaccurate . . . . . . . . . . . . . . . . . . . . . . . 5-21
5.4.4 Odometer Advances When PTO Engaged . . . . . . . . . . . . . . . . . . . . . . . . . . 5-22
5.4.5 Speedometer Does Not Change Speed When Two-Speed Axle Engaged . . . . . . . . . . 5-23
5.4.6 Engine Hours Do Not Advance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24