HOUSING A. 9F6969 - Caterpillar

Illustration 1 g01068348
Electrical schematic of the automatic lubrication system
(1) TWIN Display. (2) Pressure switch. (3) Pump and control unit.
Table 1
Tools Needed Qty
6V-7070 Digital Multimeter 1 Check for the Pressure Switch
Disconnect the 2 pole connector from the pressure switch.
Use a multimeter in order to measure the resistance between the two contacts. When there is no pressure in the system the contact of the switch should be open. If necessary, remove the switch in order to make sure that no pressure is present below the pressure switch. You will only need to remove the upper part. The diverter valve can be left in place. When the adjusted pressure is reached, the contact should close.
Press the test button on the pump in order to start a test cycle.
When possible, mount a pressure gauge between the diverter valve and the pressure switch in order to check the switching point. Note: Use a pressure gauge that is suitable for a grease pressure of 25000 kPa (3626 psi).
Since the connector of the switch is disconnected, the control unit cannot switch off the pump when the adjusted pressure is reached. Therefore, turn off the engine start switch when the pressure (switching) for the pressure switch has been reached. The test cycle is now complete.
Disconnect the connector for the pump.
Connect both contacts of the connector of the pressure switch with a separate wire.
Measure the resistance between pin 7 and pin 8 of the connector. The measured resistance should be approximately 0 ohms.
Remove the wire between the contacts of the connector of the pressure switch. The multimeter should read "open load". Check for the Pump and the 5/2 Magnetic Valve
Personal injury or death can result from escaping fluid under pressure.Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.Always use a board or cardboard when checking for a leak.
Disconnect both grease lines from the pump unit. Note: Pressure may still be present in the channels.
Connect a pressure gauge to each channel of the pump unit. Use a pressure gauge that is suitable for a grease pressure of 25000 kPa (3626 psi).
Press the test button for four seconds in order to start a cycle. The pump will pump grease from one of the channels. The pressure reading of the gauge that is connected to this channel should increase to the maximum attainable pressure of 24000 1000 kPa (3500 145 psi). Note: The pump is not switched off by the pressure switch because the system is disconnected.If the pump does not reach the indicated pressure, several situations must be considered:
There are air bubbles in the grease. Disconnect the pressure gauge. Permit the grease to flow until all of the air bubbles have escaped from the line. If necessary, refill the reservoir with oil in order to remove air from the pump element.
Grease is viscous. Therefore,