How to Choose Forklift Parts?

1. Check whether the part numbers and specifications of forklift parts are appropriate

Most forklift parts have a specific part number and technical parameters. When purchasing electrical system accessories, pay attention to checking whether the voltage and power are consistent with those of the replaced accessories. When purchasing forklift engine drive belts, pay attention to the model and length width.

2. See if the trademark logo on the outer packaging is complete

The outer packaging quality of high-quality forklift parts is relatively good. At the same time, the writing on the packaging box is clear, and the overprint color is bright. Some important components, such as generators, starters, hydraulic pumps, etc., are also equipped with instruction manuals, certificates and inspectors’ stamps to guide users in the correct use of maintenance methods. Therefore, you should carefully recognize when purchasing to prevent buying fake forklift parts.

3. See if the shape and size of forklift parts are deformed

Some forklift parts are prone to deformation due to improper manufacturing, logistics, and storage.

• You can roll the shaft part along to see if there is light leakage at the joint between the parts. And roll the glass plate to judge whether it is bent.
• When choosing the forklift clutch driven disc steel plate or friction plate, you can hold the plate close to your eyes to observe whether it is warped.
• When choosing seals such as forklift oil seals, the end surface of the oil seal with a frame should be in a perfect circle, which can be fitted to the plate glass without warpage. And the outer edge of the non-skeleton oil seal should be straight. You can hold it by hand to deform it to see if it is able to return to its original shape after letting go.
• You should also use professional measuring tools to check the geometric dimensions and shapes when purchasing gaskets.

4. Check whether the joint parts of the forklift parts are flat

In the process of handling and storage of forklift parts, burrs, indentations, breakages or cracks may occur at the joints due to vibration and bumps, which may affect the installation and use of forklift parts. Therefore, you should check the joint parts during purchase or inspection.

5. Check for rust on the surface of forklift parts

The surface of qualified parts has both a certain precisionand a bright finish. The more important parts are, the higher the precision, and the stricter the rust and corrosion protection of the packaging. You should replace the parts if they are found to have rust spots, mildew spots, cracked rubber parts, loss of elasticity, or obvious cutting tool lines on the surface.

6. Check whether the protective surface of forklift parts is intact

Most accessories are coated with a protective layer at the factory. For example, piston pins and bearing bushes are generally protected by paraffin, while the surfaces of forklift piston rings and cylinder liners are coated with anti-rust oil and wrapped in wrapping paper. The valves and pistons of forklift engine parts are soaked in anti-rust oil and sealed in plastic bags. You should return or exchange the parts if the sealing sleeve of the sealed bag is broke, the packing paper is missing, or the rust preventive oil or paraffin is lost.

7. See if the glued parts are loose

The forklift parts formed by two or more parts are formed by pressing, bonding or welding. No looseness between the accessories is allowed. For example, the forklift oil pump plunger and the adjusting arm are assembled by pressing; the forklift clutch pressure plate and the clutch plate are riveted; the forklift friction plate and the steel plate are riveted or glued; the filter core frame and filter paper of various filter elements are glued; the circuit wires of electrical equipment are welded. You should replace the parts if find and looseness during purchase.

8. See if the rotating parts are flexible

When purchasing a forklift oil pump and other rotating parts assembly, turn the pump shaft by hand to feel flexible and free from jamming. When purchasing a needle roller bearing, support the inner ring of the bearing with one hand and rotate the outer ring with the other hand. The outer ring should be able to rotate quickly and freely, and then gradually stop. If the rotating parts do not rotate properly, it means that the internal rust or shape has been deformed, which will affect the use, and should be returned or replaced.

9. See if there are any missing parts in each assembly

For high-quality forklift assembly components such as the clutch or transmission of the forklift transmission system, the parts and accessories must be complete and intact to ensure the smooth and normal operation of the assembly. If individual small parts are missing, the assembly parts will not work or even be scrapped.

10. See if the assembly marks of forklift parts are clear

In order to ensure that the assembly relationship of other mating parts meets the technical requirements, assembly marks are engraved on the surface of some parts (such as timing gears). If there is no mark or the mark is fuzzy and unrecognizable, it will bring great difficulties to the assembly work, or even bring out wrong installation.

11. Check whether the mating surface is worn or not

If there are signs of wear on the mating surface of the accessories, or the painted accessories find old paint after removing the paint on the surface, it is mostly disguised as scrap parts. In this case, you can directly request a replacement.

12. Check whether the surface hardness of forklift parts meets the standard

The surface hardness of each mating part has specified requirements. After confirming the purchase and negotiating with the merchant, the stubble of the hacksaw blade can be used to test scratch. If there is no scratch when scratching, it means that the hardness is high. If there are obvious marks after scratching, it means that the hardness is low. However, it is necessary to pay attention not to damage the working surface of the accessories during the test.

There are many factors that affect the cost of sand casting. Here, we have listed some of the main factors, and hope that this information can help our casting customers.

1. Cost of pig iron and scrap steel

Pig iron and scrap steel is the main material of cast iron and cast steel, so their price will directly affect the cost of sand casting.

2. Alloy cost

If your casting parts need to add alloys such as chromium, nickel, copper and molybdenum, then their prices will be more expensive than ordinary metal grades.

3. Casting process

Different casting processes will greatly affect the cost of castings. The cheapest is the molding sand casting process, then resin sand casting is more expensive, and the pre-coated resin sand casting process (eg hot shell and core molding process) will be the most expensive process.

4. Resin cost

As for the casting process with resin sand and pre-coated resin sand, the price of resin will affect the cost of the casting, but it will not affect the sand casting process.

5. The size and weight of the casting

As for small castings weighing less than 1 kg, the price per kg will be much more expensive than large castings because they will lead to more production time and grinding works.

6. Sand core

If your casting parts need to use sand cores in the production, then its cost will be higher than that without sand cores. This is because the sand cores need to be produced separately.

7. other factors

In addition, there are many other factors. The annual demand is greater, then their prices will decrease. Simpler sand castings will be cheaper. Material grades will affect difficult production and heat treatment, so materials with higher grades are more expensive. Higher requirements summing up surface quality and casting defects will lead to higher production costs because of the scrap rate. In addition, there are other factors such as processing costs, painting and packaging costs.

Therefore, they are many factors that affect the cost of sand casting. Therefore, it is inaccurate to estimate its cost only through a calculation formula. This foundry needs to consider these factors based on production experience and current prices of materials and labor.

• Working principle of forklift hydraulic system

The basics of the hydraulic system go like this: Confined oil has pressure on it from one side. That pressure forces the oil against a piston on the other side of the container. That transfers energy into the piston, forcing it upward. The piston cannot move in the opposite direction unless the pressure is released. In terms of the forklift hydraulic system, the pistons raise the forks and keep them lifted until the hydraulic pressure is released by the operator.

• Composition and function of forklift oil pump

Forklift piston oil pump is mainly composed of small forklift parts such as pump body, seal, oil outlet and inlet valve etc. Its function is to suck the oil used by the forklift from the oil tank to generate a certain pressure of the oil to overcome the resistance of the oil filter and pipeline, and to ensure continuous delivery of sufficient oil to the oil injection pump.

Working principle diagram of forklift oil pump

• The forklift oil pump is installed in the forklift hydraulic system. Now, let me introduce the safety technical requirements of forklift hydraulic system accessories.

Forklift hydraulic system accessories occupies an important position in the use of forklifts. Forklift working device accessories mainly rely on hydraulic system for lifting, tilting and other actions. The working condition of the forklift hydraulic system will directly affect the working condition of the forklift. Once the hydraulic transmission system parts of the forklift have malfunctions, it will inevitably bring direct unsafe consequences. Therefore, it is important for the safe operation and driving of the forklift to maintain the hydraulic system in strict accordance with the safety technical requirements. The following are the safety technical requirements for forklift hydraulic system:

1. The oil level of the oil tank shall not be lower than the oil mark line of the oil level indicator. And the application of hydraulic oil shall comply with the regulations. At the same time, the oil shall be clean, and the filters shall not be blocked.

2. The overflow valve should be sensitive and reliable; The nuts of the adjusting bolts must be complete; And the pressure regulation should meet the equipment requirements.

3. The components, pipelines and joints of the forklift hydraulic system should be unblocked. There is no leakage of the seal, no friction with other accessories, and no aging or deterioration of the rubber hose. The internal leakage should be within the allowable range.

4. The compression spring of the forklift multi-way valve must be intact, and the valve stem can be quickly back to position when eliminating the external force. The joystick should have a certain strength and rigidity, the surface should be smooth, without deformation. And the joystick should be positioned reliably, and not displaced due to vibration. The overflow valve should be sensitive and fully open when overloaded by 25%. And the nuts of the adjusting bolts should be fully tightened.

5. Crawling, stagnation and significant impact should not occur within the rated speed range of each hydraulic cylinder.

6. Each high-pressure hose should undergo a pressure test and meet the specified requirements.

7. Various control valves should be safe, reliable, and sensitive.

How to Avoid Ductile Iron Casting Rust?

Yide iron casting is a leading casting supplier and machining factory in China, provides ductile iron casting oil pump, cast iron pipe, cast iron valve and so on. But Will These Iron Casting Rust?

Will Ductile Iron Casting Rust ?

Rust is a chemical reaction, because the chemical properties of iron are vivid, and it will rust after a certain time. Moisture is one of the substances that make iron rust. However, water alone will not cause iron to rust. Only when the oxygen in the air dissolves in the water, the oxygen reacts with iron in a watery environment to produce something called iron oxide, which is rust.

 How to Avoid Rust for Iron Casting?

Then, will ductile iron casting rust？The key is whether the anti-corrosion process of the ductile iron castings is in place. Qualified ductile iron castings are required to be lined with standard thick road cement. At the same time, the outer wall of the casting is required to be sprayed with zinc and coated with asphalt, and other epoxy paints may be selected.

There are some specific methods to prevent ductile iron castings from rust:

1. Asphalt paint coating

Asphalt paint coating is suitable for gas pipelines. Preheating the ductile iron pipe before painting can improve the adhesion of asphalt paint and accelerate drying.

2. Cement mortar lining with special coating

This internal anti-corrosion measure is applicable to sewage pipelines, which can improve the corrosion resistance of the lining.

3. Epoxy coal asphalt coating

Epoxy coal asphalt coating is suitable for both gas pipelines and sewage pipelines. It is a two-component coating, which has high adhesion and a very smooth surface.

4. Epoxy ceramic lining

Epoxy ceramic lining is suitable for sewage pipes and gas pipelines. However, due to difficulties in manufacturing process and high cost, epoxy ceramic lining has certain limitations in use. The epoxy ceramic lining has high adhesion and smoothness, and is an excellent anti-corrosion coating.

5. Aluminate cement coating or sulfate cement coating

These two special cement coatings are suitable for internal anti-corrosion of sewage pipes, which can improve the resistance to acid and alkali components in sewage.

Yide casting has 27 years’ casting & machining experience, known as an iron casting manufacturer in China, specialized in the grey iron cast, ductile iron cast, and brass iron casting, and also provides machining service for the rough iron casting pipe or iron casting pump products etc. So Yide casting is a one stop solution of casting, if you have demands of casting, please don’t hesitate o contact us for more details.

The use of large steel castings is relatively common, such as mechanical equipment parts and precision steel castings on automobiles, which have relatively high quality requirements for products. In order to ensure the quality of these products, large steel castings manufacturers should control from a relatively basic process:

1. According to the drawings provided, we should select the appropriate casting equipment. This basically guarantees the product quality of the steel castings. In the process of producing, solve the problems effectively, so as not to cause bigger losses.

2. We should repair the surface in the first place if the product is defective in the process.

And then, what are the precautions in the process of producing large steel castings?

1. Precautions for heat treatment of large steel castings

The strength level of large steel castings is close to the forged steel, with poor plasticity and resistance, uneven and not dense inside, large internal chemical composition error, poor thermal conductivity and messy structure. Therefore, it is necessary to pay special attention to eliminate internal stress and prevent cracking during heat treatment, but not necessary to take the harm of hydrogen into account. When formulating the heat treatment process, you can refer to the TTT curve, CCT curve and hardenability curve of the same steel grade. Meanwhile it is necessary to pay attention to the influence of uneven chemical composition, coarse grains and other casting defects.

2. Partial heating phenomenon of large steel castings

There are many factors for partial heating phenomenon of large steel castings, mainly the following three types: 1) System overload, which is mainly manifested in excessive pressure or speed. 2) Oil outlet pipe is too thin, which leads to high oil flow rate and generates a lot of heat. 3) Poor cleanliness of the oil, which leads to increased internal wear, reduced volumetric efficiency, and oil leakage and throttling from the internal gap to generate heat.

3. The reason of infiltration during the processing of large steel castings

Infiltration is actually a method of porosity treatment, especially micropores which can not be seen with naked eye. The appearance of micropores will cause leakage of the sealing medium, and increase the wear of the machining tool. Besides, micropores will also increase the cost, so that the quality of the product cannot be guaranteed. In the application process of the product, it will lose its function.

4. Causes of subcutaneous pores in large steel castings

The generation of subcutaneous pores is a comprehensive reaction of improper operation of various links and procedures in the casting process. The reasons for the formation are complex and there are many influencing factors. We should pay attention to every operator and process involved.

In the casting process, the structure of large steel castings needs to be repaired for the parts after molding. There are many ways to repair the mold. 

1. After the parts are moulded, there will be some places that are soft and not tight. Use a knife to loosen and use a tool to cram.
2. The damaged part of the intersection of the two walls can be glued with sand with a knife, wiped to the gap and then smoothed.
3. Large pieces of sand can be repainted with muddy water to re-patch.
4. If there is a groove in large area, you can dig out the part first, and then repair it.