Putting Hydraulic Systems Together
(1) Thorough Cleaning: Ensure that the work area, the containers holding the parts, and all related tools, accessories, and cleaning oils are spotless, free from dirt and foreign contaminants.
(2) Detailed Inspection: Examine each part individually for burrs, flashes, bumps, scratches, and rough edges, addressing any issues before assembly. Pay special attention to the edges around the oil passage holes in the cylinder bore and the oil grooves of the valve shaft, ensuring they are smooth and clean.
(3) Pre-assembly Clearance Checks: Determine and anticipate the clearances of each part. Typically, the clearance between the outer cylindrical surface of the distribution shaft and the inner hole of the cylinder should be around 0.04mm. Excessive looseness can lead to internal leakage and diminished volumetric efficiency.
2) Assembly Steps
(1) Insert the oil sealing bulkhead along with its sealing ring into the spline grooved hole at the output end of the cylinder block, securing it with the elastic retaining ring to position the shaft (refer to Figure 6-7).
(2) Place the rear cover with the sealing ring onto the flange, fitting it into the concave edge of the guide rail, and secure it with positioning pin 12. After ensuring a firm fit, position the opening upward.
(3) Group the steel ball and plunger together and insert them into the plunger hole of the cylinder block. Rotate the cylinder block slightly to align it with the curved surface of the guide rail.
(4) Attach the front end cover with the rotary oil seal to the guide rail and rear cover using screws. While tightening the screws, rotate the output shaft (the cylinder block) to ensure it moves freely without obstruction.
(5) When inserting the spring and speed change valve into the inner hole of the distribution shaft for variable motor use, ensure that the screw plug at the end of the speed change valve is securely fastened. If using it as a fixed motor, the screw plug should be removed.
(6) Fasten the distribution shaft to the rear cover with screws, tightening them diagonally and evenly. Check that the output shaft rotates freely without any obstruction.
Use and Maintenance
(1) User Instructions:
The reliability and lifespan of the hydraulic motor largely depend on the careful selection, proper use, and maintenance of the hydraulic system’s components, including hydraulic motors and pumps. To ensure normal operation, consider the following:
– Choose an appropriate hydraulic transmission system.
– Use hydraulic fluid that meets structural and operational requirements.
– Ensure proper oil filtration.
– Prevent the hydraulic machine from experiencing excessive loads.
– Maintain a working fluid temperature below 60°C during thermal balance.
– Utilize control mechanisms, monitoring devices, and auxiliary equipment that meet operational needs.
– Ensure high installation quality for the hydraulic system.
– Conduct regular inspections, maintenance, and overhauls of hydraulic transmission devices.
(2) Working Fluid Requirements:
Statistical analysis shows that over 70% of Automotive Lift Repair Tampa Florida hydraulic equipment failures stem from severe oil contamination. Therefore, the working fluid must meet these essential criteria:
– Stability: The working liquid should maintain its properties during operation and storage, exhibiting oxidation resistance and stability under mechanical stress without forming precipitates.
– Viscosity: The oil must have suitable viscosity and favorable viscosity-temperature characteristics, ensuring minimal reduction in viscosity with rising temperatures.
– Compatibility: The working fluid should not react with the materials used in Automotive Lift Repair Tampa Florida hydraulic system components (metal, plastic, rubber, etc.).
– Thermal Conductivity: The fluid must effectively transfer heat from high-temperature areas to cooler locations.
– Bulk Modulus: A high bulk modulus is essential for minimizing compressibility under pressure, affecting the system’s operational accuracy. Presence of air bubbles can significantly lower this modulus.
– Low Volatility: Ideally, the fluid should have a low saturated vapor pressure and high boiling point, along with minimal foaming to prevent operational issues.
– Non-flammable: Preferably, the working fluid should be non-flammable to reduce fire hazards.
– Cost-effectiveness: The fluid should also be economical and practical.
Users must select the appropriate oil grade as per manufacturer guidelines and ensure the installation of relevant oil filtration devices to maintain the cleanliness of the hydraulic motor and the entire Automotive Lift Repair Tampa Florida hydraulic system.
(3) Operation and Maintenance:
The QJM series motors function similarly to other low-speed, high-torque motors with inner curves. During operation and inspection, pay attention to the following:
(1) Before installation, fill the hydraulic motor casing with working fluid. If the casing is empty during inspection, disassemble the hydraulic motor and remove any rust. If the motor has been stored for a long time without oil changes, drain the old oil and replace it with new working fluid upon installation. If clean hydraulic oil of the same grade has been used during storage, there may be no need to replace the inner oil before installation.
(2) Follow the manual during installation. Ensure the pipe joint for the motor drain hole has a thread length of ≤10mm and a diameter of ≥10mm. Use appropriate tools for assembling and disassembling the hydraulic motor. Avoid welding the connecting pipe to hydraulic components to prevent damage to precision surfaces. Maintain adequate space between pipelines and hydraulic transmission components for monitoring and maintenance.
(3) Never inspect or disassemble Automotive Lift Repair Tampa Florida hydraulic transmission components while under pressure.
(4) Clean hydraulic components and remove dirt from pipelines during installation. Keep the workspace clean, and seal all inlets and outlets of working fluid and pipe ends to prevent contamination.
(5) Prior to starting the Automotive Lift Repair Tampa Florida hydraulic device, ensure the air plug is unscrewed to release any trapped air, verify the correct installation of the hydraulic system, check for potential overloads, confirm the working fluid level, activate monitoring instruments (starting with pressure gauges), remove unnecessary items, disconnect machinery driven by the Automotive Lift Repair Tampa Florida hydraulic system, inform the operator to start the transmission, and verify the hydraulic motor’s steering.
(6) During the test run, gradually introduce working fluid to achieve 20%-30% of the rated speed. Increase speed incrementally to reach rated speed, ensuring the pressure drop does not exceed 0.5 to 1 MPa when operating without load. During testing, watch for unusual noises, unstable shaft rotation, or fluid leaks from seals. If any issues arise under high pressure, stop the Automotive Lift Repair Tampa Florida hydraulic transmission immediately and address the faults before restarting.