Views: 0 Author: Site Editor Publish Time: 2026-05-18 Origin: Site
As a professional supplier of second-hand rotary drilling rigs, we deeply understand your core requirements for purchasing second-hand equipment: balancing cost-effectiveness and reliability, and eliminating the hidden dangers of “worry free when buying and frequent maintenance when using”. The engine hydraulic main pump, as the “heart” of the hydraulic system of the rotary drilling rig, directly determines the drilling efficiency and operational stability of the equipment, and is also one of the core components that are most prone to failure and have the highest maintenance costs for second-hand equipment. To dispel your worries, we provide professional maintenance and comprehensive testing of the engine hydraulic main pump as our core value-added service, which runs through the entire process of equipment selection, maintenance, and delivery. We use strict standards to identify hidden dangers and professional techniques to repair problems, so that every two handed rotary drilling rig you buy can be efficiently constructed with the hydraulic performance of a “quasi new machine”.
Unlike the extensive model of ordinary second-hand vendors who only sell without repair, only inspect without adjustment, our maintenance and testing services focus on the high-frequency fault points and long-term hidden dangers of the hydraulic main pump of the rotary drilling rig. Our team of senior hydraulic maintenance engineers operate the entire process, relying on professional testing equipment and standard maintenance processes, to achieve “comprehensive testing without dead corners, accurate and guaranteed maintenance, and thoughtful after-sales follow-up”, truly making you “buy with confidence, use with peace of mind, and save with comfort”. Here is a detailed introduction to our exclusive service project for repairing and testing engine hydraulic main pumps:
We adhere to the principle of “testing first, preparation later, and delivery later”, and carry out a triple inspection of “static+dynamic+disassembly” for the hydraulic main pump of the second-hand rotary drilling rig engine. The entire process follows the standard process of “external first, internal second, simple first, complex second”, and each inspection is recorded in detail, forming an exclusive inspection report, allowing you to clearly understand the real working conditions of the main pump.
No need to start the equipment, focus on investigating the basic hidden dangers of the external and surrounding components of the main pump, quickly identify intuitive faults, and lay the foundation for subsequent testing. Specific projects include:
-Sealing part inspection: Focus on inspecting key sealing parts such as the main pump shaft seal, pipeline joints, flanges, etc., to check for oil leakage (leakage is mostly caused by aging seals, loose joints, or shell cracks), mark and record the leakage parts, and repair them synchronously in the future;
-Fixed and connection detection: Check the tightness of the main pump fixing bolts and coupling connecting bolts, and investigate issues such as bolt looseness, thread wear, and missing parts (loose bolts can easily cause transmission deviation, vibration and noise, and affect drilling accuracy);
-Inspection of shaft components: Observe whether the main pump transmission shaft is deformed, worn, or corroded, whether the coupling is intact and undamaged, and identify potential power transmission hazards (bending of the transmission shaft or damage to the coupling can cause abnormal operation of the main pump, and in severe cases, lead to chain failures);
-Oil detection: check the hydraulic oil level (within the rated scale range of the equipment), oil quality, and observe whether the oil is clear, turbidity free, foam free, and metal debris free. If the oil is blackened, emulsified, and other pollution, immediately identify the source of pollution, and synchronously replace the qualified hydraulic oil (oil pollution is one of the main causes of internal wear of the main pump);
-Overall appearance inspection: Check for cracks, deformations, and scratches on the main pump housing, identify hydraulic oil leaks and internal component damage caused by housing damage, and ensure that the overall structure of the main pump is intact.
Start the rotary drilling rig engine to bring the hydraulic system to normal operating temperature (usually 40-60 ℃), simulate actual construction loads, test the dynamic performance of the main pump, and troubleshoot hidden faults. Specific tasks include:
-Pressure parameter detection: By using a professional pressure gauge, the output pressure of the main pump under no-load, half load, and full load conditions is detected, and the rated pressure standard of the equipment is compared to check for problems such as insufficient pressure and excessive pressure fluctuations (abnormal pressure is often caused by improper setting of the main relief valve and wear of internal components, which can result in weak drilling and slow drilling speed);
-Flow parameter detection: detect the output flow rate of the main pump, investigate problems such as insufficient flow rate and flow fluctuation, and determine whether the variable mechanism adjustment is sensitive (abnormal flow rate can cause the drilling rig to move slowly, affecting construction efficiency, common reasons include inclined plate jamming, regulator wear, etc.);
-Noise and vibration detection: Use a stethoscope to monitor the sound of the main pump during operation, and check for any abnormal noise (such as high-frequency whistling, low growling). At the same time, detect the operating vibration value (≤ 4.5mm/s). Abnormal noise is often caused by bearing damage, cavitation, coupling misalignment, and other reasons, which can exacerbate component wear in the long run;
-Temperature detection: Monitor the changes in oil temperature during the operation of the main pump, and troubleshoot issues such as rapid oil temperature rise and overheating (temperature rise ≤ 35 ℃ after normal continuous operation for 4 hours). Abnormal oil temperature is often caused by severe internal leakage of the main pump and damaged bearings, which can accelerate oil aging and damage internal seals;
-Variable mechanism detection: Test the sensitivity of three adjustment methods: negative flow control, full power control, and proportional solenoid valve control, identify issues such as variable mechanism jamming and response delay, and ensure that the main pump can accurately adjust the output flow and pressure according to construction requirements.
For anomalies discovered during static and dynamic inspections, or for equipment with long service life and complex operating conditions, we will professionally disassemble the main pump, conduct in-depth inspections of internal core components, and identify hidden wear and potential faults. Specific projects include:
-Core component wear detection: detect the wear of key friction pairs such as plungers, cylinder bodies, and distribution plates, measure the radial clearance (≤ 0.03mm) and axial clearance (≤ 0.05mm) between plungers and cylinder diameters, and check whether the distribution plate is eroded (if the erosion area is greater than 30%, it needs to be replaced). If the wear exceeds the tolerance, repair or replace it immediately;
-Variable mechanism detection: Disassemble the variable control mechanism, check the wear and deformation of servo pistons, feedback rods, and other components, clean the servo pistons with ultrasonic waves to ensure flexible adjustment, and identify hidden dangers such as variable mechanism jamming and adjustment failure;
-Bearing and shaft inspection: Check whether the internal bearings of the main pump are worn, damaged, or stuck, detect the degree of wear and coaxiality of the transmission shaft, investigate noise, overheating, and other problems caused by bearing damage, and replace the original specification bearings if necessary;
-Seal inspection: Check the aging and damage of all seals inside the main pump, with a focus on identifying vulnerable sealing parts. Replace all seals with brand new high-quality seals to eliminate internal leakage hazards;
-Internal cleaning inspection: After disassembly, thoroughly clean the interior of the main pump to remove impurities such as oil sludge and metal debris. Check whether the internal channels are blocked to ensure the cleanliness of the main pump and avoid impurities from exacerbating component wear.
Our maintenance service is centered on “precise repair and long-term durability”. For all faults found during testing, senior engineers develop exclusive maintenance plans, using original factory parts and professional maintenance techniques. We refuse “perfunctory maintenance and temporary use” to ensure that the performance of the repaired main pump meets the equipment’s rated standards and extends its service life. Specific maintenance items include:
-Leakage repair: For leaks in shaft seals, joints, flanges, and other parts, replace aging seals, tighten loose joints, professionally repair shell cracks, and thoroughly solve leakage problems;
-Pressure/Flow Abnormal Maintenance: Adjust the set pressure of the main relief valve, repair or replace worn components such as plungers and distribution plates, clean the variable mechanism, solve problems such as insufficient pressure, flow fluctuations, and insufficient flow, and restore the power output of the main pump;
-Noise and vibration maintenance: replace damaged bearings and couplings, correct the coaxiality of the transmission shaft, clean the oil suction filter element, tighten the oil suction pipe joint, and solve abnormal noise and vibration caused by cavitation and transmission deviation;
-Repair of high oil temperature: repair the leaking parts inside the main pump, replace worn bearings, clean the hydraulic system radiator, replace deteriorated hydraulic oil, ensure the normal operating temperature of the main pump, and avoid component overheating and damage.
-Friction pair repair: Professional repair is carried out on worn plungers, cylinder bodies, and port plates. The port plate is machined with a surface grinder (flatness ≤ 0.005mm) and then ultra precision ground. The plunger is subjected to external cylindrical grinding (cylindricity ≤ 0.003mm) and hard chrome plating to restore sealing performance and motion accuracy;
-Variable mechanism maintenance: repair or replace servo pistons, feedback rods, and other components that are stuck or worn, re adjust the sensitivity of variable mechanism adjustment, and ensure accurate and controllable flow and pressure;
-Replacement of bearings and shafts: Replace worn or damaged bearings and transmission shafts, using accessories that are consistent with the original factory specifications to ensure stable power transmission and reduce operational wear;
-Shell repair and replacement: Professional repair shall be carried out on the main pump shell with cracks or deformations. If the damage is severe, a new shell shall be replaced to ensure the overall stability of the main pump structure and avoid secondary failures.
After all maintenance work is completed, we will conduct a comprehensive performance test on the main pump to ensure that the maintenance is qualified before assembling it to the equipment. The testing items include:
-No load running in test: Run in at 500rpm for 10 minutes without load to check the smoothness of the main pump operation;
-Loading test: Test the flow rate and pressure stability at 25%, 50%, and 100% rated pressure, ensuring that the volumetric efficiency is ≥ 90% and the pressure pulsation is ≤± 2% of the rated pressure;
-Continuous load test: Work continuously for 2 hours at 80% rated pressure to check for normal oil temperature, noise, and vibration. There should be no visible oil film at the shaft seal for 24 hours;
-On site acceptance testing: After assembling the main pump to the equipment, simulate actual construction conditions, test the smoothness of drilling, lifting and other actions of the drilling rig, and ensure that the main pump and equipment work together normally.
We are well aware that the core competitiveness of second-hand rotary drilling rigs lies in “reliability”, and the performance of the hydraulic main pump directly determines the reliability of the equipment. Our value-added maintenance and testing services, different from conventional industry services, have three core advantages to safeguard your construction:
-Professional team: Maintenance and testing engineers have over 5 years of experience in repairing hydraulic systems of rotary drilling rigs. They are familiar with the main pump structures and fault characteristics of various mainstream models and can quickly and accurately troubleshoot and repair faults;
-Standard process: From inspection, maintenance to testing, all follow standardized processes, with detailed records of each step, forming exclusive inspection and maintenance reports, allowing you to clearly understand the working conditions of the main pump;
-After sales guarantee: After delivering the equipment, we provide exclusive after-sales follow-up services. If there are any maintenance related problems with the main pump, we will promptly arrange for engineers to come and handle them, eliminating your subsequent maintenance troubles.
Buying a second-hand rotary drilling rig, choosing cost-effectiveness and seeking reliability. We are not only a supplier of second-hand rotary drilling rigs, but also a professional partner for your equipment operation and maintenance. Our exclusive value-added service for engine hydraulic main pump maintenance and testing is our commitment to you, and it is also our confidence in the industry – using professional technology to identify hidden dangers and providing thoughtful services to solve concerns, so that every second-hand rotary drilling rig can become a “capable worker” on your construction road, helping you reduce operation and maintenance costs, improve construction efficiency, and achieve mutual benefit and win-win results!
