OM4207 04/10 Automatic Lubrication System - Section 42 42-1 AUTOMATIC LUBRICATION SYSTEM GENERAL DESCRIPTION The automatic lubrication system is a pressurized lubri- cant delivery system which delivers a controlled amount of lubricant to designated lube points. The sys- tem is controlled by an electronic controller which sig- nals a solenoid valve to operate a hydraulic motor powered grease pump. Hydraulic oil for pump opera- tion is supplied by the truck steering circuit. 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, the grease is forced into the pump cylinder.
Simultane- ously, grease is discharged through the outlet 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 trans- ferred through the outlet check and discharged to the outlet port. 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 pressure. 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 pump. 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 maximum working pressure for any component in the system. DO NOT alter or modify any part of this sys- tem unless factory authorization.
DO NOT attempt to repair or disassemble the equipment while the system is pressur- ized. Ensure all fluid connections are securely tightened before using this equipment. Always read and follow the fluid manufac- turer's recommendations regarding fluid compatibility. Check all equipment regularly and repair. Replace worn or damaged parts immedi- ately. This equipment generates very high grease pres- sure. Use extreme caution when operating this equipment. Pressurized grease can pierce the skin causing serious bodily injury. Adequate protection such as safety goggles and protective clothing is recommended. FIGURE 42-1. PUMP & RESERVOIR COMPONENTS 1. Hose From Filter 2. Outlet to Injectors 3.
Hydraulic Motor 4. Pressure Reducing Valve 5. Solenoid Valve 6. Test Switch 7. Vent Valve 8. Pressure Gauge 9. Pump Assembly 10. Flow Control Valve 11. Pressure Switch (Optional) 12. Grease Reservoir 13. Vent Hose If fluid penetrates the skin, get medical care imme- diately! Do not treat as a simple cut. Tell the attend- ing physician exactly what fluid was injected.