Return to Master Table of Contents POWER MODE VALVE CURRENT SIGNAL AND HYDRAULIC PRESSURE ADJUSTMENTS Page 13 Hydraulic System Troubleshooting, Testing and Adjustment WARNING! This procedure should be done with two people. To reduce the chance of accident or unintended start-up, one person should remain at the operator’s control stand while checks and adjustments are made. The electromagnetic pressure proportioning control (EPPR) "power mode" valve is located on the underside of the pumps (not visible in the harness connections drawing, because it is underneath the assembly), near the engine/pump flexible coupling, adjacent to the pump return line.
To test and adjust power shift current and pressure through the power mode valve a multi-lead jumper harness is required. The jumper harness (which is available through Daewoo After Sales Service, or could be spliced together from commonly available, purchased parts) has extra leads so that a VOM meter can be connected to the circuit. To set up the testing equipment, turn off the engine and disconnect the single electrical lead from the power mode valve. Attach the jumper harness to the terminal on the valve, connect the test leads of the multimeter to the extra leads on the harness and reconnect the valve electrical lead.
Vent the lever on top of the hydraulic tank to relieve pressure and connect an in-line "t-style" adapter to the valve pressure port. Install a 60 bar/870 psi (1,000 psi) test gauge in the adapter. Restart the engine and increase engine RPM by turning the speed control to the maximum speed setting. Warm up the engine and hydraulic system until hydraulic oil temperature is at least 45°C (113°F). Select Power Mode on the Instrument Panel. Check current readings (in milliamps) on the VOM meter and hydraulic pressure gauge readings and make sure both conform to the values in the table below. NOTE:
If recorded values do not conform to the specified current or pressure in the table, back off the lock nut on the end of the valve, turn the adjusting screw 1/4 turn and re-check current and pressure. Repeat adjustment as required to obtain specified performance and retighten the valve lock nut. Mode Engine RPM Current Pressure Power Mode High Idle: 2,150 RPM 600 ±20 mA 1.5 bar (22 psi) Standard Mode High Idle 2,150 RPM 0 mA 18 bar (261 psi)