Doosan heavy duty machine VBO calibration require you to do pump EPPR valve check,so here show you the steps.
Preparations:
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Pump EPPR valve check
*Calibration judgement
3.1. Measure the input & output current of the pump EPPR valve in certain condition
Ex. DX350LC-7, Normal outputs of pump EPPR valve (Please refer the shop manual to check the exact value
on each model)
3.2. Check the physical condition of the EPPR valve
3.2.1. Assembly condition
3.2.2. External damage
3.2.3. Short circuit
Ex. DX350LC-7(Please refer the shop manual to check the exact value on each model)
3.3. Measure the resistance of the EPPR valve
3.3.1. Measure the resistance of the valve coil: If the measurement is infinite, this indicates an
open circuit of the coil in the valve.
3.3.2. Measure the resistance of the valve coil: If the measurement is 0Ω, this indicates a short
circuit of the coil in the valve.
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