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Foton Lovol Oil Pipe Plug Assembly FT300.55B.029
Core Functions and Operating Principles
1. Dynamic Pressure Sealing: When the tractor operates implements (such as plows or rotary tillers) that require lifting and lowering, immense instantaneous high pressure is generated within the hydraulic circuit.
2. This plug assembly utilizes high-strength mechanical threads and a composite washer to securely seal the circuit port, preventing pressure leakage. Maintenance (Venting and Inspection):
3. After the initial filling of hydraulic fluid or replacement of the hydraulic pump, this plug can be slightly loosened to bleed air from the lines, thereby preventing cavitation in the hydraulic cylinders or loss of lifting power.
Structure and Composition
1. FT700.55D.029 Handwheel Assembly I: Located at the outermost position, allowing operators or maintenance personnel to manually adjust, tighten, or loosen the component.
2. JBT982-8 Washer: Features a composite structure with a metal outer ring and a rubber inner lining; it serves as the primary sealing element to prevent high-pressure hydraulic fluid leakage.
3. FT700.55D.129 Cover Plate: Serves to secure and protect the internal hydraulic port connections.
4. FT300.55B.165 Tension Rubber Sleeve: Provides internal tension to prevent the screw plug from loosening due to severe vibrations or jolts during tractor operation.
5. FT300.55B.166 Adjusting Nut: Used to adjust the tightening depth of the plug.
6. GBT91-3.2X16-A0P Pin: A standard pin used for mechanical locking to prevent internal components from detaching.
Common Issues and Maintenance Recommendations
1. Oil Seepage/Leakage: If oil residue is found on the lift housing or around the edges of the pipe plug, it is usually due to the rubber component of the composite washer aging or cracking from heat. Replacing the washer resolves the issue; there is no need to replace the entire assembly.
2. Stripped Threads on Handwheel or Housing: Mud and grit from the field can enter the threaded areas; forcing the components apart during disassembly may damage the handwheel assembly or strip the threads on the housing.
3. Maintenance Recommendations: Whenever the tractor undergoes major seasonal maintenance, clean away any accumulated mud around the pipe plug. Check that it is securely tightened to ensure the hydraulic system delivers its full lifting capacity.
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