OM4026.2 4/00 Rotary Pump Maintenance - Section 4 Automatic Lubrication System Page 4-13 AUTOMATIC LUBRICATION SYSTEM GENERAL DESCRIPTION During the down stroke, the pump cylinder is extended into the grease. Through the combination of shovel action and vacuum generated in the pump cylinder chamber, the grease is forced into the pump cylinder. Simultaneously, grease is discharged through the out- let of the pump. The volume of grease during intake is twice the amount of grease output during one cycle. During the upstroke, the inlet check valve closes, and one half the grease taken in during the previous stroke is transferred through the outlet check and discharged to the outlet port.
The Lincoln Automatic Lubrication System is a pres- surized lubricant delivery system which delivers a controlled amount of lubricant to designated lube points. The system is controlled by an electric timer which signals a solenoid valve to operate a hydraulic motor powered grease pump. Hydraulic oil for pump operation is supplied by the truck steering circuit. Grease output is proportional to the hydraulic motor input flow. A pump control manifold, mounted on top of the hydraulic motor, controls input flow and pres- sure. A 24VDC Solenoid mounted on the manifold turns the pump on and off.
The pump is driven by the rotary motion of the hydrau- lic motor, which is then converted to reciprocating motion through an eccentric crank mechanism. The reciprocating action causes the pump cylinder to move up and down. The pump is a positive displacement, double-acting type as grease output occurs on both the up and the down stroke. Over-pressurizing of the system, modifying parts, using incompatible chemicals and fluids, or using worn or damaged parts, may result in equipment damage and/or serious personal injury. * DO NOT exceed the stated maximum working pressure of the pump, or of the lowest rated component in the system.
* Do not alter or modify any part of this system unless approved by factory authorization. * Do not attempt to repair or disassemble the equipment while the system is pressurized. * Make sure all fluid connections are securely tightened before using this equipment. * Always read and follow the fluid manufac- turer’s recommendations regarding fluid compatibility, and the use of protective cloth- ing and equipment. * Check all equipment regularly and repair, or replace, worn or damaged parts immediately. This equipment generates very high grease pres- sure.
Extreme caution should be used when oper- ating this equipment as material leaks from loose or ruptured components can inject fluid through the skin and into the body causing serious bodily injury including possible need for amputation. Adequate protection is recommended to prevent splashing of material onto the skin or into the eyes. FIGURE 4-2. PUMP AND RESERVOIR COMPONENTS 1. Hose From Filter 2. Outlet to Injectors 3. Hydraulic Motor 4. Pressure Reducing Valve 5. Solenoid Valve 6. Vent Valve 7. Pressure Gauge 8. Pump Assembly 9. Flow Control Valve 10. Pressure Switch 11. Relay Box 12. Grease Reservoir 13.
Vent Hose If any fluid appears to penetrate the skin, get emer- gency medical care immediately! Do not treat as a simple cut. Tell attending physician exactly what fluid was injected.