OM4015.2 10/98 Lubrication & Service - Section 4 Lincoln Automatic Lubrication System Page 4-11 LINCOLN AUTOMATIC LUBRICATION SYSTEM Operation Components The automatic lubrication system (Figure 4-1) is con- trolled by an electric timer and an electrically operated solenoid valve. During truck operation, the timer peri- odically operates a switch which energizes the sole- noid air valve. As the solenoid air valve opens, regulated air enters the pump air motor, and the pump begins to operate, delivering lubricant through the supply lines to each injector.
At the same time, as regulated air is applied to the air motor, regulated air is applied to the vent valve which keeps the vent valve closed until the 3-way solenoid air valve is denergized. The system is comprised of seven basic elements plus the necessary hoses and lube lines: 1. Air Pressure 2. Air Regulator and Gauge 3. 24 VDC Solid State Timer 4. 3-way Solenoid Air Valve 5. Lube Injectors 6. Grease Reservoir 7. Air Pump Motor Description of Components After the injectors have cycled, lubricant pressure rises quickly to 2500 psi (17.5 MPa), and the pump stalls against this pressure.
The pump will remain stalled for a few seconds until the timer switch contact is broken and the solenoid air valve is de-energized, shutting off the air supply. Trapped air exhausts, the vent valve opens, and lubricant pressure in the supply line is vented back to the reservoir. The injectors reload and the system is reset and ready for the next lube cycle. 1. Air Powered Reciprocating Pump a. 50:1 Pressure Ratio. b. Reservoir Grease Capacity of 60 lbs. (27.2 kg). 2. Air Regulator and Gauge a. Normal Operation - regulator output should be set at 60-65 psi (414-448 kPa). b. Extreme Winter Conditions - regulator output may be reset to 90 psi (621 kPa).
Figure 4-1 shows input air supply to the pump going through the solenoid air valve, then through an air regulator to the air powered pump. A branch line of regulated air is routed directly to the vent valve. 3. 24 VDC Solid State Timer: Operating Temperature Range -20°F to 131°F (-29°C to 55°C). The timer is mounted in the cab to help insure temperature stability. FIGURE 4-1. TYPICAL AUTOMATIC LUBRICATION SYSTEM 1. Air Supply 5. Vent Valve 9. To Next Injector Grp. 13. Pipe Plug 2. D.C. Timer 6. Unloader 10. Injectors 14. Pipe Plug or 3. Solenoid Air Valve 7. Pump 11. Lubricant Reservoir Grease Coupler 4. Air Regulator & Guage 8. To Lube Point 12. Lubricant Supply Line