How to quickly repair wheat combine harvester

Proper maintenance of a wheat combine harvester is essential, especially under time constraints, limited equipment, or other challenging conditions. Maintenance personnel often have to rely on basic tools and techniques, so attention to detail is crucial. Here are some key considerations for effective maintenance: (1) Rivets in the harvester's knife assembly are typically formed through cold extrusion, not heat. Heating them can weaken the material. After riveting, use a forming punch to reinforce the blade and knife bar, ensuring durability. (2) Pay special attention to vulnerable components such as pins, plates, sleeves, and horns. Avoid using excessive grease during repairs—replace worn-out parts when they reach their limit. Delayed replacement can reduce the lifespan of other mechanical components. (3) When repairing shafts without a balancing machine, mount a thrust bearing on one end and secure it with a three-jaw lathe chuck. The other end can be supported by a center rest if the lathe is too short. If weights are needed, tighten them with screws rather than welding, which can damage the structure. (4) Due to the variety of materials used in maintenance, sourcing new parts can be difficult. In such cases, old shafts can be repurposed. Most Chinese-made shafts are made from 45# carbon steel. If heat treatment is required, you can use an oxygen and earth furnace to heat the part to red or black, then quench it in brine for hardening. (5) When machining parts, try to create oil grooves in sleeve holes to make lubrication easier. Some areas of the harvester are hard to access for oiling, so heavy grease or oil can be used instead. However, avoid using these on nylon sleeves, as they are designed to resist deformation under impact. (6) When repairing keys and keyways on pulleys and shafts, ensure dimensions remain consistent. Never enlarge the key size, as this can compromise the shaft’s strength. For the keyway on the shaft, weld a new groove opposite the old one. For the pulley, use a transition fit method and secure the key with a countersunk screw. (7) When maintaining hydraulic systems, remove the distributor and flow control valve, and use an air pump to test each line. Filter and vent the hydraulic oil before reinstallation. The main focus during hydraulic repair is the seal, which should be replaced entirely rather than just repaired. By following these practices, even with limited resources, you can ensure your harvester remains in good working condition and lasts longer. Always prioritize safety and precision, even when working with basic tools.

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