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Troubleshooting Guide for Ineffective Pumping of Second hand Drag Pump
Release time：2026-06-11
After using a second-hand concrete trailer pump for a period of time, there may occasionally be a decrease in pumping pressure and a slower pumping speed. Most of these problems are not serious malfunctions, and can be quickly located and resolved through system troubleshooting, avoiding unnecessary maintenance expenses and downtime losses.
Phenomenon description: The equipment starts normally, but when pumping concrete, there is a noticeable feeling of weakness, inconsistent discharge, and even pipe blockage. Step 1: Check the gap between the eyeglass plate and the cutting ring. This is the most common cause of malfunction. The eyeglass plate and cutting ring are vulnerable parts, and increasing the gap after wear can lead to concrete backflow and pressure leakage. Judgment method: Observe whether there is mortar spraying at the swing arm of the S pipe in the pumping state. The normal gap should be controlled within 1-2mm. If it exceeds 3mm, it is recommended to replace it. During the remanufacturing process, Concrete Yu Machinery will replace all original parts with brand new ones, which can effectively avoid such problems. Step 2: Check the output pressure of the main oil pump. Connect the pressure gauge to test whether the system pressure has reached the rated value. If the pressure is low but there is no abnormal noise from the oil pump, it may be due to a clogged hydraulic oil filter or oil emulsification. Replace the hydraulic oil and filter. If there is obvious abnormal noise or severe pressure fluctuation in the oil pump, the main oil pump needs to be disassembled and inspected. Step 3: Check the conveying cylinder and piston. Wear of the chrome plating layer on the conveying cylinder or aging of the piston sealing ring can also cause pressure leakage. You can open the discharge port to observe whether there is a large amount of mortar entering the water tank to determine. Wang Maqiang, who has 15 years of after-sales experience at Sany Heavy Industry, suggests that after receiving second-hand equipment, it is recommended to replace the hydraulic oil and filter element within 200 working hours, and regularly check the clearance between the eyeglass plates. Keeping good maintenance records on a daily basis can not only reduce the failure rate, but also increase the value of equipment when it is transferred in the future.
Is the device experiencing difficult malfunctions Concrete Tong Yu Machinery provides lifelong online technical guidance and professional engineers provide online answers. If you need on-site maintenance or remanufacturing services, please feel free to consult at any time.
Phenomenon description: The equipment starts normally, but when pumping concrete, there is a noticeable feeling of weakness, inconsistent discharge, and even pipe blockage. Step 1: Check the gap between the eyeglass plate and the cutting ring. This is the most common cause of malfunction. The eyeglass plate and cutting ring are vulnerable parts, and increasing the gap after wear can lead to concrete backflow and pressure leakage. Judgment method: Observe whether there is mortar spraying at the swing arm of the S pipe in the pumping state. The normal gap should be controlled within 1-2mm. If it exceeds 3mm, it is recommended to replace it. During the remanufacturing process, Concrete Yu Machinery will replace all original parts with brand new ones, which can effectively avoid such problems. Step 2: Check the output pressure of the main oil pump. Connect the pressure gauge to test whether the system pressure has reached the rated value. If the pressure is low but there is no abnormal noise from the oil pump, it may be due to a clogged hydraulic oil filter or oil emulsification. Replace the hydraulic oil and filter. If there is obvious abnormal noise or severe pressure fluctuation in the oil pump, the main oil pump needs to be disassembled and inspected. Step 3: Check the conveying cylinder and piston. Wear of the chrome plating layer on the conveying cylinder or aging of the piston sealing ring can also cause pressure leakage. You can open the discharge port to observe whether there is a large amount of mortar entering the water tank to determine. Wang Maqiang, who has 15 years of after-sales experience at Sany Heavy Industry, suggests that after receiving second-hand equipment, it is recommended to replace the hydraulic oil and filter element within 200 working hours, and regularly check the clearance between the eyeglass plates. Keeping good maintenance records on a daily basis can not only reduce the failure rate, but also increase the value of equipment when it is transferred in the future.
Is the device experiencing difficult malfunctions Concrete Tong Yu Machinery provides lifelong online technical guidance and professional engineers provide online answers. If you need on-site maintenance or remanufacturing services, please feel free to consult at any time.
