Maintenance - Section 4 OM4006.2 10/98 Page 4-16 Automatic Lube System System Operation: 1. During truck operation, with the pump and timer systems in a rest state, a preset time interval (2.5 to 80 minutes) occurs. 2. The solid state system timer sends out a 24 VDC signal to energize SV1, and also the flasher timer on SV2. 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. 3. As SVI opens, the hydraulic fluid pressure flows through the pressure reducing valve and on to SV2. * DO NOT exceed the Maximum Pump Pressure of 3500 p.s.i. (24.1 MPa). 4.
The pressure reducing valve lowers hydraulic fluid pressure to the operating range of the hydraulic pump [maximum pressure 300 p.s.i. (2069 kPa)]. This pressure also signals the Vent Valve causing it to close. * 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. 5. After the system pressure has been reduced, it passes on to SV2. Each operation of SV2 moves the hydraulic cylinder which operates the grease pump.
As SV2 turns ‘‘On’’ and ‘‘Off’’ (refer to cycle timer/flasher below), it changes the direction of the hydraulic cylinder movement back and forth, thus causing a ‘‘pumping’’ action. * Make sure all fluid connections are securely tightened before using this equipment. * Always read and follow the fluid manufacturer’s recommendations regarding fluid compatibil- ity, and the use of protective clothing and equipment. * Check all equipment regularly and repair, or replace, worn or damaged parts immediately. 6. The cycle timer/flasher sends a pulsing signal, 1 second ‘‘On’’ and 1 second ‘‘Off’’ (adjustable), to SV2. Solenoid valve SV2 directs the hydraulic fluid to the pump at 30 cycles/minute.
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. Ade- quate protection is recommended to prevent splashing of material onto the skin or into the eyes. 7. With the vent valve closed, the pump cycles until lubricant pressure reaches maximum pump out- put pressure* (pump stalls). As the grease supply line comes to maximum pressure, the injectors meter grease to the points of lubrication. * WARNING: Maximum Pump Pressure Not to Exceed 3500 p.s.i. (24.1 MPa).
Exceeding this value will damage components and/or cause components to rupture, resulting in possible serious injury to any nearby personnel . 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. 8. After approximately 75 seconds, the Solid State System Timer returns to the rest state, which de-energizes SV1 solenoid valve. If overpressurizing of the equipment is believed to have occurred, contact a factory authorized warranty and service center for inspection of the pump.
Specialized equipment and knowledge is required for repair of the pump or adjustments other than the maintenance specified in this manual. 9. As SV1 is de-energized, the hydraulic supply to the pressure reducing valve and the vent valve is shut off, causing the vent valve to open. 10. When the vent valve opens, the pressure in the grease line is vented back to the grease reservoir and the line pressure drops to zero (0), so the injectors can recharge for their next output cycle. Annual inspection by the factory authorized warranty and service center is recommended. 11. The system is now at rest, ready for another lube cycle and the sequence repeats itself.