OM4202 Automatic Lubrication System - Section 42 Page 42-7 6. Observe the 35 MPa (5000 psi) pressure test gauge in the grease supply line. The pressure should be 17.2 - 20.7 MPa (2500 - 3000 psi). 24 VDC Solid State Timer Check To check the solid state timer operation without wait- ing for the normal timer setting, proceed as follows: 1. Remove the timer dust cover. NOTE: The timer incorporates a liquid and dust tight cover which must be in place and secured at all times during truck operation. Do Not exceed maximum pump pressure of 24.1 MPa (3500 psi).
Exceeding this value will damage components and/or cause components to rup- ture, resulting in possible serious injury to any nearby personnel. 2. Adjust the timer to the 5 minute interval setting. 3. The timer should cycle in five minutes if the truck engine is operating. NOTE: If the timer check is being performed on a cold start, the first cycle will be approximately double the nominal setting. All subsequent cycles should be within the selected time tolerance. If the pressure is not correct, adjust the pressure reducing valve until the pressure gauge (installed at Step 1) indicates 17.2 - 20.7 MPa (2500 - 3000 psi) grease pressure. 4.
Voltage checks at the timer should be accom- plished if the above checks do not identify the problem. NOTE: DO NOT exceed 2.1 MPa (300 psi) on the cylinder pressure gauge (2, Figure 42-1). a. Ensure timer ground connection is clean and tight. 7. With the jumper wire installed, verify that the fol- lowing events occur in this order: b. With the truck keyswitch ON, use a volt-ohm meter and read the voltage between the BAT (+) and BAT (-) terminals on the solid state timer. Normal reading should be 18-26 VDC, depending upon whether or not the engine is running. a. The pump starts stroking and the LED on the flasher unit atop of SV2 flashes on and off at approximately one second intervals. b.
All of the injectors stroke down. c. The pump stalls. Use the grease pressure gauge to determine whether the pump stalls. 8. Turn the keyswitch OFF and remove the jumper wire installed in Step 5, then verify the following: a. The pressure on cylinder pressure gauge (2, Figure 42-1) drops to zero (0). b. The pressure on the grease pressure test gauge (installed at Step 1) drops to zero (0). c. All of the injectors reset (indicator pin up). 9. Remove grease pressure test gauge (installed in Step 1). 10. At the hydraulic bleeddown manifold, reconnect the bleeddown solenoid (disconnected in Step 4). Verify that hydraulic system now bleeds down.