Broken hammer recruitment

Is it better to buy a second mobile phone or a new one for excavators? What should I pay attention to when buying a second-hand excavator?

1. Buy an old machine if you know how to maintain it, and try to buy a new one if you don't.

Some owners bought an old machine very cheaply, but it took a lot of time to maintain it, and sometimes the maintenance cost even exceeded the purchase cost. I don't know maintenance, I don't know accessories, I can't choose a car, I will save money if I buy it, and the cost is not necessarily low.

2. The longer the construction period, the more stable it is to buy a new machine.

Long-term cooperation in the construction site, high stability can buy a new machine, which can ensure timely repayment of loans. However, the monthly price of the construction site that has been working for many years is definitely relatively low. At present, the overall environment is not good, which can be weighed according to the specific situation.

3, buy a new machine to buy a recognized brand in the old machine market.

When buying a new machine, you must buy brands and models that are well circulated in the second-hand market. The real use cost of a piece of equipment is the purchase price+maintenance cost and residual value. The higher the residual value, the lower the use cost. The less you actually spend. Brand models that sell well have a relatively high residual value. Avoid buying brands that have never been heard in the market, or domestic brands that have fallen in price have fallen too hard, unless this domestic brand recycles second-hand equipment indefinitely.

I'm not sure about the time limit and payment.

Rent it first. Including the fact that the funds are really pitiful, but the venue requires high equipment quantity and work efficiency, so it can only be rented.

In addition, the hours and years of some rented equipment are relatively high. Service delay will seriously affect the workload. You can only enter the site according to the construction period first, and then try to replace it later.

5. Don't buy new or old machines without local service.

The old machine is not necessarily broken, and the new machine is not necessarily broken. As long as the local service strength of this brand is not good, there is even no service. This brand of equipment is not available.

6. Try to choose equipment suitable for working conditions, with high working efficiency, fuel saving and environmental protection.

According to the acceptable engineering conditions, choose the appropriate model, and the equipment with low fuel consumption is more popular. Those who waste too much oil will be eliminated by Party A sooner or later. The other is environmental protection, so as not to make trouble for the relevant departments.

First, beware of paint renovation.

The first thing to do in machine renovation is painting. You can see some doorways by observing the paint of the whole car. Many black-hearted car dealers paint the whole car and then expose it to the rain, so that the color of the refurbished machine looks very close to the original car.

Second, beware of tampering with the timetable.

The smaller the actual hours of equipment, the longer the remaining service life of the machine, and the lower the failure rate of parts, so unscrupulous merchants can cover up the actual hours of equipment by adjusting the hours.

Third, beware of replacing and repairing three major parts.

Engine: See if the engine is too clean. The cleaner, the bigger the problem. There is a nameplate on the engine, so you can find out when it was produced and see if it can match the age of the excavator, especially if the screws have not been moved. There is hair on the corner of the moved screw. Touch it with your hand to see the frustration. If you use a wrench to remove an untouched screw, there will be a click.

Hydraulic pump: Check for flow regulation, pressure regulation and oil leakage. If this happens, be careful, it is likely to be dismantled and refurbished.

Distribution valve: Check the distribution valve for signs of oil leakage. Some distribution valves are integral and some are single-piece. If it is paint, there should be traces in the middle, and you can see whether the distribution valve has been moved.

Fourth, beware of frame revision.

Rollover and accident vehicles will be deformed, so they will generally be corrected and repainted. If the damage is serious, even the whole frame will be replaced. If the door is uneven, uneven, even difficult, or not the original frame at all, it is basically judged as decoration.

Five, beware of arm fracture renovation

The methods to deal with the cracks on the boom are usually welding, grinding, scraping putty and painting. You can see it at a glance after spraying the new paint! They have a unique skill, a little mud, covered in new paint for more than 20 days, peeling off the mud, it is not so obvious. Therefore, when purchasing a machine, the big and small arms need special attention, and if necessary, they need to be repeatedly touched to see if there is any connection or unevenness.

Six, beware of chassis parts renovation

Generally, the refurbished chain bars do not look very symmetrical after rolling. The easiest way to look at the chain plates is to look at their screws. The biggest difference between imported screws and domestic screws is that imported screws will not fall off, and they look smooth after long-term wear. The original chain is marked and easy to distinguish. Check whether the two traveling motors are running at the same speed, which means there is a problem.

Seven, identify whether to install a broken hammer.

As we all know, for excavators, the unit price of crushing is higher than that of digging, and it is nearly twice as high. However, "the gun hurts the body", and the hammer is more harmful to the excavator, especially to the hydraulic pump and the vehicle counterweight. So how should we judge whether the excavator is equipped with a breaking hammer? Here is an introduction:

1, first check the appearance, because the appearance of the excavator with the hammer will be loose, and check whether the screws and arms of all parts have been welded, including whether there are cracks and welds in the chassis;

2. Check whether the leakage of the hydraulic system is serious, whether the color of hydraulic oil is normal, whether the distributor has traces of disassembly, whether the baffle of the inlet and outlet of the valve body attached to the distributor is disassembled or replaced (the baffle of the original car will be thrown away after being loaded with a hammer), whether the oil return plug next to the hydraulic oil tank is damaged (traces of wrench screwing) and whether it is replaced (the original car is metal).

3. Check whether the hydraulic pump is decomposed or replaced (the hydraulic pump installed with a hammer will leak hydraulic oil in the early stage), check the coordination of the excavator's action during composite operation, and check whether there are any faults such as deviation;

4. Check whether the hydraulic pilot system in the cab has any traces of change, and check whether the control mode of the electric control button is equipped with solenoid valves and connecting wires; Whether there are traces of installing protective net on the front side of the cab, and whether the pins are loose seriously.

More ways to identify whether the excavator has used a hammer.

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