_______________________________________ Adjustment procedures Hydrostatic pump relief valve adjustment The hydrostatic pump used to drive the conveyor chain on the feeder breaker has two main pressure relief valves and one charge relief valve (Fig. 73). The main relief valves are preset at 5,000 psi and the charge relief valve at 350 psi. To adjust the main relief: WARNING! Follow all standard safety procedures before beginning this adjustment process. Failure to do so may result in serious injury or death. 1. Locate the forward direction pressure port on the hydrostatic pump (Fig. 73) and remove the forward pressure hose from the pump. Plug the hose end and cap the pump fitting. WARNING! The hose plug and the fitting cap must be properly torqued before proceeding as the system pressure will reach 5,000 psi. Failure to do so may result in serious injury or death. 2. Turn the machine on (refer to Start up section in this chapter). IMPORTANT! Do not run the pump for a long period of time while setting the reliefs as all of the flow will be going over the relief. Excessive pump operation with the lines plugged will result in overheating and the eventual failure of the pump. 3. Two people are required to adjust pressure settings. One person must move the conveyor direction valve handle to the forward direction, monitor the pressure gauges, relay pressure gauge readings to the mechanic making the adjustments, and be ready to shutdown the machine via the panic bar, if necessary. The second person will perform the actual pressure adjustment at the hydrostatic pump (Fig. 73). WARNING! Two people are required to adjust the pressure settings. One person must move the conveyor direction valve handle to the forward direction and remain at the conveyor controls and panic bar at all times during the adjustment procedure. Failure to do so may result in serious injury or death. The conveyor forward pressure must be adjusted if the system pressure gauge does not read 5,000 psi when the conveyor direction valve is placed in the forward direction. If the system pressure gauge does read 5,000 psi during the conveyor forward relief pressure test, then proceed to Step 8. 4. Locate the corresponding relief pressure adjustment valve for the forward pressure port (Fig. 73).
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