Where is the boom holding valve of Komatsu 120 located?
1 Answers
The boom holding valve is installed between the boom control valve and the bottom of the boom cylinder. When the boom control lever returns to the neutral position, the boom holding valve prevents the boom from naturally descending, allowing the boom to remain in place. For Komatsu parts, you can contact Zhizao Dagan. Installation location: The boom holding valve is installed at the oil port from the main control valve to the bottom of the boom cylinder. When the boom control lever is in the neutral position, this valve prevents the oil at the bottom of the boom cylinder from returning to the tank through the boom main valve core under the influence of gravity, thereby preventing the boom from naturally descending. Precautions: Generally, only the boom and the arm have holding valves. Therefore, if the boom or arm drops, it is necessary to separately inspect the valve core and spring of the holding valve for wear or other foreign objects causing sticking issues. If the problem persists after cleaning, it can be resolved by replacement.