Doosan Heavy Duty Machine Pump EPPR Valve Check Guide

Doosan heavy duty machine VBO calibration require you to do pump EPPR valve check,so here show you the steps.

 

Preparations:

Doosan Data Monitoring System DMS-5 DMS-3 Free Download

Doosan Diagnostic Tool

 

Pump EPPR valve check

*Calibration judgement

Doosan Heavy Duty Machine Pump EPPR Valve Check Guide (1)

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)

  1. Not in operation: 300 ±30 mA
  2. Pilot operation: up to 750 ±30 mA
  3. Relief pressure up operation: 800 ±30 mA

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)

Doosan Heavy Duty Machine Pump EPPR Valve Check Guide (2)

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.

More topics for Doosan,please refer to:Doosan Trouble Repair

(Visited 23 times, 1 visits today)