TUBE 5088124 - Caterpillar

Hydraulic System Pressures
The system pressure gauges for the wheel drive system and cutter drive system should be checked periodically during operation.The operating pressures in the wheel and cutter drive systems are interdependent. If the load on the cutter system is increased by increasing the depth of cut, the load on the wheel drive system will also be increased, and the pressures in both systems will rise. If the load on the wheel drive system is increased by increasing the travel speed, the load on the cutter drive system will also be increased, and the pressures in both systems will rise.To reduce the pressures in the wheel and/or cutter drive systems, one or more of the following can be done:1. Reduce the depth of cut being made.2. Reduce the the working speed.3. Increase the cutter speed. (The cutter should always be at full speed while working). The auxiliary system pressure should always be 2,000 psi. The pressure can be changed with the adjusting screw on the auxiliary pump.Hydraulic Oil Filter Indicator Light
If the hydraulic oil filter indicator light comes on after the hydraulic oil temperature has reached 100°F, shut the engine down immediately and change the return filter elements. The indicator light is turned on by a pressure switch that is activated only when the hydraulic oil returning to the oil tank is bypassing the oil filter and the oil cooler. Since the oil cooler is being bypassed, the hydraulic oil temperature will rise rapidly when working and cause the engine to automatically shut down in a short time. See page 4-41 for procedures for changing the filter elements.Hydraulic Oil Temperature
It is extremely important that the hydraulic oil temperature be checked periodically during operation. Continuous operation of the machine with high hydraulic oil temperatures will cause rapid wear and failure of pumps and motors.If the hydraulic oil temperature rises to 210°F and remains there or continues to rise, shut the engine down and thoroughly clean the exterior surfaces of the hydraulic oil cooler and radiator. Use an air hose to remove any loose material and then, if necessary, use a steam cleaner to remove any remaining material. Also check the condition of the engine coolant and, if the coolant shows signs of system corrosion, flush and clean the cooling system.If the hydraulic oil temperature rises to 210°F and remains there after the radiator and oil cooler have been cleaned, change the return filter elements immediately. If the hydraulic oil temperature reaches 220 to 225°F, a temperature sensor will automatically shut the engine down. THE WATER SPRAY SYSTEM PROVIDES WATER TO A WASHDOWN NOZZLE THAT SHOULD BE USED DAILY TO WASH THE OIL COOLER AND RADIATOR CORES.Central Lubrication Light
If the central lubrication low level alarm light comes on during operation, the lubrication reservoir should be refilled as soon as possible. The grease pumped through the cutter bearings by the system not only lubricates the bearings, but also flushes the dust caused by the cutting operation out of the bearings. Continued