TESTING AND ADJUSTING TESTING AND ADJUSTING ENGINE SPEED TESTING AND ADJUSTING ENGINE SPEED 4. Measuring pump relief and one-touch power maximizing speed 1) Set the fuel control dial in the high idling (MAX) position. 2) Relieve the arm circuit by moving the arm IN, keeping pressing the one-touch power maxi- mizing switch, and measure the engine speed. a The one-touch power maximizing func- tion is reset automatically in about 8.5 seconds even if the switch is kept held. Accordingly, measure the engine speed in that period. MEASURING 1. Preparation work 1) Turn the starting switch ON and set the mon- itor panel in the "Monitoring function [02]" to prepare for measurement of the engine speed.
a For the operating method, see "Special functions of monitor panel". Monitoring code: 010 (Engine speed) a The engine speed is displayed in rpm. 2) Warm up the engine to the following operat- ing condition. Engine coolant temperature: Within oper- ating range Hydraulic oil temperature: 45 – 55°C a Measure the engine speed with the work- ing mode switch in the A-mode position. 5. Measuring auto-deceleration speed 1) Start the engine and set the fuel control dial in the high idling position (MAX). 2) Set the work equipment control, swing con- trol, and travel levers in neutral and measure the engine speed.
a The engine speed lowers to a certain level about 5 seconds after all the levers are set in neutral. This level is the auto- deceleration speed. ADJUSTING Adjusting governor spring a If the high idling speed is out of the standard range or the engine speed is unstable (the engine hunts), adjust the governor spring with "Governor adjustment function [03]" of the moni- tor panel. a For the adjustment procedure, see SPECIAL FUNCTIONS OF MONITOR PANEL. 1. Measuring low idling speed 1) Set the fuel control dial in the low idling (MIN) position. 2) Set the work equipment control, swing con- trol, and travel levers in neutral and measure the engine speed. 2.
Measuring high idling speed 1) Turn the auto-decelerator switch OFF. 2) Set the fuel control dial in the high idling (MAX) position. 3) Set the work equipment control, swing con- trol, and travel levers in neutral and measure the engine speed. 3. Measuring pump relief speed 1) Set the fuel control dial in the high idling (MAX) position. 2) Relieve the arm circuit by moving the arm IN and measure the engine speed. 20-104 PC130-7 (1)