Doosan DX225 Boom Slow – Complete Troubleshooting Guide A slow boom on the Doosan DX225 indicates a hydraulic flow, pressure, or control issue. This guide explains all symptoms, causes, and step-by-step troubleshooting to restore full boom speed and lifting performance. 1. Symptoms of Boom Slow (DX225) Boom raises very slowly Boom cannot lift heavy loads Boom speed decreases after warming up Boom movement is jerky or inconsistent Other functions (arm/bucket) may be normal Engine does not bog down during boom operation Hydraulic oil temperature increases quickly 2. Causes of Boom Slow on Doosan DX225 A. Pilot Pressure Problems Low pilot pressure to boom spool Clogged pilot filter Faulty pilot pressure reducing valve Weak joystick pilot signal B. Boom Spool Issues (Main Control Valve) Internal leakage inside boom spool Spool sticking due to contamination Worn spool seals Center bypass leakage C. Rel...
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