Professional tools are required to replace the bearings of the TY125-40-4KW shaft-mounted reducer to ensure the accuracy and safety of disassembly and assembly, and to avoid damage to the shaft and bearing seat. The following is a list of recommended tools and operational points:
1. Core disassembly and installation tools
Hydraulic puller (three-claw or four-claw) For safely disassembling bearings with interference fit, it is recommended to use a hydraulic puller with a pressure gauge, which can control the pulling force within a reasonable range and prevent damage to the shaft end. For the shaft diameter of TY125 model (usually Φ50-Φ70mm), specifications above 10 tons are recommended.
Induction heaterWhen installing a new bearing, an induction heater is used to heat the inner ring of the bearing to 80–120°C. The principle of thermal expansion and contraction is used to achieve stress-free assembly and avoid knocking damage to the raceway.
Torque wrench (accuracy ±3%) Used to tighten end cover bolts and lock nuts to ensure that the specified torque value is reached (for example, M24 bolts require 320N·m) to prevent loosening or overload damage to the threads.
Dial indicator and magnetic gauge baseAfter installation , check the bearing clearance and axial displacement to ensure that the clearance is within the standard range (usually 0.05–0.15mm) to ensure smooth operation.
2. Auxiliary tools and consumables
Special bearing installation sleeve and tapping rodIf there is no heating equipment, the cold installation method can be used, and the copper rod and sleeve can be installed by tapping. However, attention must be paid to uniform force to avoid unbalanced loading.
Journal protective sleeve and dust coverProtect the shaft shoulder and threaded parts during the disassembly process to prevent scratches caused by the sliding of the puller claw.
Cleaning and Lubricating MaterialsUse absolute alcohol or acetone to clean the journal and bearing seat to ensure cleanliness; apply molybdenum disulfide grease (NLGI level 2) during assembly to reduce startup wear.
Sealant (such as Loctite 515) Apply sealant when the box joint surface is reassembled to prevent oil leakage during operation.
3. Measuring and testing instruments
Infrared Thermometer : Monitor the bearing temperature during the heating process to prevent material annealing caused by over-temperature.
Inner diameter micrometer and outer diameter micrometer : Measure the dimensions of the journal and bearing seat hole to confirm whether the fit tolerance meets the requirements (it is recommended that journal Ra ≤ 0.8 μm, cylindricity ≤ 0.01 mm).
