How much do you know about tractors?

An agricultural tractor is a self-propelled power machine used to tow and drive implements to perform various mobile operations; it can also serve as a stationary power unit for fixed-position tasks. It consists of an engine, a transmission system, a running gear, a steering system, a hydraulic suspension system, a power take-off (PTO) device, electrical instrumentation, a drive control system, and a traction system or device. The engine's power is transmitted through the transmission system to the drive wheels, thereby propelling the tractor forward. In practical applications, rubber belts are often used as the medium for power transmission.

Is hydraulic technology utilized in tractors?

The application of hydraulic technology in tractors is becoming increasingly widespread. In agricultural tractors—particularly large-scale models—almost all major components, such as the clutch, power-shift transmission, differential lock, brakes, and steering mechanism, are controlled using hydraulic devices. In some tractors, seat adjustment as well as the opening and closing of windows are also hydraulically controlled. Furthermore, some tractors feature electro-hydraulic suspension systems. Because control switches can be conveniently positioned—allowing for a corresponding reduction in the length of hydraulic lines—this technology is expected to see even more extensive application in large-scale tractors.

Why is safety in agricultural tractors a priority?

There is growing emphasis on the safety performance, ease of operation, and cabin comfort of agricultural tractors. A thoughtfully designed cab—equipped with a comprehensive array of instruments—not only improves the driver's working conditions and ensures safety but also enhances labor productivity and the quality of work performed.

What are some common malfunctions in agricultural tractors, and how can they be resolved?

Oil leaks at the flared ends of hydraulic lines

Cause: Poor sealing contact between the conical surface of the flared pipe end and the corresponding flared seat.

Remedies/Precautions:

1. When tightening the connector, always tighten the flared end first.

2. After smoothing the flared joint surface, apply a sealant to the conical face before tightening; alternatively, cut off the damaged flared end and use a flaring tool to create a new flare.

Oil leaks at hollow threaded fittings (banjo bolts)

Cause:

1. The mating surface of the pipe fitting is uneven relative to the washer.

2. The threaded hole in the housing is uneven.

Resolution: Smooth down both the mating surface of the fitting and the washer to ensure a flush fit. Flatten the hexagonal section of the hollow screw, then tighten it, or apply sealant to both sides of the washer.

Oil Leakage at Housing Mating Surfaces

Causes: Oil leaks at the mating surfaces of components—such as the oil pan, cylinder head, valve cover, timing gear cover, transmission cover, starter gear cover, etc.—are typically caused by loose fasteners or by damaged or failed gaskets.

Precautions:

1. Ensure that all fasteners are tightened securely to the proper torque.

2. For components that are rarely disassembled (e.g., those utilizing paper gaskets), apply a thin layer of red sealant to both sides of the gasket.

3. For components that require frequent disassembly (e.g., valve covers, filter housings, etc.), use asbestos gaskets and apply a coating of lead oil to the gasket surface.

When tightening, tighten the bolts symmetrically across the component in several passes. Furthermore, ensure that the gasket is intact, the mating surfaces of the components are flat and clean, and that the components themselves are free from misalignment or deformation.