CYL GP-V& 5019587 - Caterpillar

Illustration 3 g06334550Perform this test with the key in the on position. Connect Cat ET and look for diagnostics relating to the control panel (2811-3, 2811-4). Use the following procedure to troubleshoot the diagnostics.Use a 5P-7277 Voltage Tester or use a 257-9140 Digital Multimeter. Connect the negative probe to the pin 6 wire on the control panel using a 7X-1710 Multimeter Probe wire assembly or equivalent and connect the positive probe to the pin 4 wire. Rotate the dial and observe the voltage reading, the voltage should vary between 2 to 4.5 V for a properly working panel.If the panel passes the test, then refer to the machine troubleshooting guide and check for voltage to the motor and driver module if equipped.Test Procedure for Testing Electrical Components in the Air Conditioning System
The air conditioning systems on Cat machines use pressure switches to protect the air conditioning system. Some air conditioning systems on Cat machines use pressure switches and on delay timer assembly for the refrigerant compressor to protect the air conditioning system. Arc suppressors protect other electrical components in the air conditioning system. Arc suppressors are applied to discharge electrical inductance when the compressor disengages. Failure of the arc suppressor can affect the reliability of the pressure switch. Failure of the arc suppressor may cause failure of the pressure switch.The following procedures are for the testing of the on delay timer assembly, pressure switches, and components of the arc suppressor.
Table 2
Required Tools
Part Number Part Description
257-9140 Digital (Fluke 87V Multimeter) Pressure Sensor Tests
Illustration 4 g06191033Test Procedure for 367-9098 Pressure Sensor Gp (OUTLET AIR)
Pressure sensors are used to protect the A/C compressor. The high pressure and low-pressure sensors have three possible sensor positions which are given below:OPEN - System pressure is low.CLOSED - System pressure is correct.OPEN - System pressure is high.The two OPEN positions of the pressure sensor protect the air conditioning system. The OPEN position prevents the compressor from actuating when potentially harmful pressures exist in the system. The CLOSED position is the normal operating sensor position. The following table contains the logic for the pressure sensors:
Table 3
Pressure Range Ambient Temperature System Response Result
High Above 2930 kPa (424 psi) for 500 msec N/A E2292 (2) Slow down compressor until it shuts off.
High Above 2585 kPa (375 psi) and less than 2930 kPa (424 psi) for 5 sec. N/A E2292 (2) Slow the compressor to a desired speed of 1300 rpm (1)
High Above 2585 kPa (375 psi) for 5 sec. Below 45° C (113° F) E2292 (2) Slow down the compressor (2)
(1) Turn of the event if the discharge pressure falls below 2585 kPa (375 psi) for 10 sec
(2) Turn off the event if the discharge pressure falls below 2585 kPa (375 psi) for 10 sec or ambient temperature is above 45° C (113° F).367-9097 Pressure Sensor Gp (INLET AIR)
Illustration 5 g06191034
Table 4
Pressure Range Ambient Temperature System Response Result
Low Above 35 kPa (5 psi) for 10 seconds Above 18° C (64° F) E2293 (2) Slow down compressor until it shuts