TESTING AND ADJUSTING STANDARD VALUE TABLE FOR ELECTRICAL PARTS 20-14 PC400, 450-6 Sys- tem Name of component Connector No. Inspection method Judgment table Measurement conditions Control system Engine throttle, pump controller Swing lock solenoid C01 Measure voltage If the condition is as shown in the table below, it is normal When either swing or work equipment control lever is 20 – 30 V operated (solenoid ON, swing lock canceled) Between (3) – Approx. 5 sec after (6),(12) swing lever and work equipment control levers are 0 – 3 V placed at neutral (solenoid OFF, swing lock applied) 1) Start engine. 2) Turn swing lock switch OFF. 3) Turn swing lock prolix switch OFF. 4) Insert T – adapter.
fl The lever can be operated slightly (without moving the equipment). Travel speed solenoid C01 Measure voltage If the condition is as shown in the table below, it is normal With travel speed switch at Hi or Mi (solenoid ON, 20 – 30 V travel motor swash plate angle min.) Between (9) – When travel speed (6),(12) switch is at Lo (solenoid OFF, 0 – 3 V travel motor swash plate angle max.) 1) Start engine. 2) Insert T – adapter. 3) Turn fuel control dial to MAX position. 4) Operate the lever slightly not enough to move the machine.
To check that the solenoid is OFF, measure with the fuel control dial at LOW (1200 rpm or below) Active boom solenoid C01 Measure voltage If the condition is as shown in the table below, it is normal When active mode switch is OFF (solenoid ON, boom LOWER 20 – 30 V spool stroke 9 mm) Between (8) – When active mode (6),(12) switch is ON (solenoid OFF, boom LOWER 0 – 3 V spool stroke 11.5 mm) 1) Turn starting switch ON. 2) Insert T – adapter. Merge/divider valve solenoid C01 Measure voltage If the condition is as shown in the table below, it is normal.
When travel is operated independ- 20 – 30 V ently (solenoid ON, divided) Between (2) – When levers and (6),(12) pedals are at 0 – 3 V neutral (solenoid OFF, merged) 1) Turn starting switch ON. 2) Insert T – adapter. fl The lever can be operated slightly When either swing or work equipment control lever is operated (solenoid ON, swing lock canceled) Between (3) – (6),(12) 20 – 30 V Approx.
5 sec after swing lever and work equipment control levers are placed at neutral (solenoid OFF, swing lock applied) 0 – 3 V With travel speed switch at Hi or Mi (solenoid ON, travel motor swash plate angle min.) Between (9) – (6),(12) 20 – 30 V When travel speed switch is at Lo (solenoid OFF, travel motor swash plate angle max.) 0 – 3 V When active mode switch is OFF (solenoid ON, boom LOWER spool stroke 9 mm) Between (8) – (6),(12) 20 – 30 V When active mode switch is ON (solenoid OFF, boom LOWER spool stroke 11.5 mm) 0 – 3 V When travel is operated independ- ently (solenoid ON, divided) Between (2) – (6),(12) 20 – 30 V When levers and pedals are at neutral (solenoid OFF, merged) 0 – 3 V