How to eliminate the slow lifting of the rear suspension of Dongfanghong tractor?

Troubleshoot whether the hydraulic oil has problems and needs to be replaced.

Rule out whether there is a problem with the tubing.

After all the above problems are eliminated, if there is any problem, it is the sealing problem of the hydraulic cylinder.

Use and maintenance of hydraulic system of Dongfanghong -75 tractor;

The four working positions of the hydraulic system are realized by manipulating the distributor handle.

When the tractor hangs the farm tools with ground wheels, the handle should be placed in the "floating" position.

When the tractor hangs farm tools without supporting wheels, the distributor handle can be placed in the "neutral" position. Maintain the relative position of farm tools and tractors.

When the farm tools hanging on the tractor need to be forced into the soil, such as pushing the soil, the distributor handle can be pulled to the "down" position.

When tractor hangs wide farm tools (such as cultivator and seeder), it is necessary to connect the long hole of the movable arm with the longitudinal pull rod in addition to placing the handle of the grain separator in the "floating" position to make the farm tools copy.

When pulling the handle, it should be agile and accurate, and it should be tapped and pushed quickly. It is not allowed to stay in the transition zone of the working position, so as to avoid the slide valve sealing the oil circuit and making the oil pressure rise abnormally. Let go immediately every time you pull to the predetermined working position.

2. During long-distance transportation, after the farm tool is lifted to the highest position, press the positioning valve by hand to block the oil passage in the lower cavity of the oil cylinder, so that the farm tool can be reliably kept in the "transportation" position.

3. Pay attention when working in the field

When lifting farm tools in the field, they should be carried out while walking.

When turning the ground in the field, it should be turned after the farm tools rise; When you start to go straight after turning, put down the farm tools.

When adjusting or cleaning the hanging farm tools, in order to avoid personal accidents, don't do it under the hanging farm tools. If necessary, adjust or clean the machine after supporting.

4. Winter use of hydraulic system. The low temperature in winter in northern China increases the viscosity of hydraulic oil, which affects the normal operation of the system. In addition to selecting suitable hydraulic oil, preheating should be done before use, and the oil temperature should not be lower than 20 degrees before work.

5. Before the hydraulic system works, the oil pump transmission clutch must be combined before the engine starts, otherwise it will easily damage or accelerate the wear of the jaw clutch.