Statistics show that around 70 percent of damage caused to diesel generators is the result of pollution of the hydraulic system or debris in the computer system. Any professional engineer knows that the purity of the hydraulic oil is the key to lasting performance of hydraulic machines. But cleanliness – it is not all.
It’s equally important to choose the correct hydraulic fluid and to replace it properly (and regularly). This is what we will discuss today in association with MRDS – the leaders in service for offshore drilling equipment maintenance.
So, when selecting the hydraulic fluid two options should be considered. First of all – ambient temperature during operation. Secondly – the viscosity of the fluid in the operating temperature range. The second parameter is specified in the documentation of every individual machine. Some sources state that the viscosity of the hydraulic fluid depends on the type of pump that is used in the computer system. This is not entirely correct. The viscosity at operating temperature is calculated based on the bandwidth of the narrowest station in the hydraulic system, since the hydraulic fluid must have a certain rate of flow through these channels, otherwise hydraulics won’t operate properly.
Consequently, for many construction machines, using the very same versions of hydraulic pumps different types and manufacturers of hydraulic fluid are frequently utilized.
By way of instance, in contemporary hydraulic excavators, so-called “proportional” valves with very little cross section of the channel are used. The system is quite complex, with electronic control components. If you pick the wrong viscosity of hydraulic oil to your machine, the machine will not operate at full capability.
The recommended oil type is usually indicated in the cockpit on the particular information labels or directly to the tank of this hydraulic system near the filler neck. Now the modern machines frequently recommends utilizing high viscosity grade oil HVLP. This is hydraulic oil with a more contemporary package of additives compared to in oils class HLP. Oils of this class have more stable viscosity-temperature performance, and in severe cold conditions they work better. Manufacturers of these oils suggest the temperature range from – 30 to + 60 degrees Celsius.
In addition to stable temperature characteristics of oils of the class possess multifunctional additives to boost anti-oxidation, anti-corrosion, anti-wear, depression, water separation, anti-foam properties of the fluid. VMGZ against HVLP For a lengthy time period Russian machines utilized two brands of hydraulic oil: VMGZ and MGE-46. In theory, these oils are not bad performance, but just for that gear, which is operated in a relatively easy manner: loaders, backhoe loaders, dump trucks, cranes lungs. When there’s such a need, it isn’t forbidden to use this oil in modern machines, which doesn’t work in very tough circumstances.
But it isn’t suggested to use those oils in contemporary hydraulics, which is controlled by servos. If we are talking about hydraulics, which might be subject to very strict requirements concerning reliability and performance, the experts advise to pay attention to imported hydraulic oil. But not so long ago on the Russian market seemed domestic products whose attributes aren’t inferior to contemporary foreign analogues. For instance, several years before, TNK has issued a string of hydraulic oils. The new lineup of products, together with oils and MGE counterparts multigrade oil VMGZ already presented lubricants class HLP and HVLP. On the quality of the class of Russian oil specialists nonetheless expressed caution. Not a lot praise, but do not make significant claims. The basis for the oil proceeds to serve the domestic raw materials.
Strangely enough service life of these oils at 2-3 times lower compared to comparable imported. However, using industrial hydraulic oil I-20, I-30, etc. that is used in this type of massively industry, is strictly forbidden. These oils have high hygroscopic, ie connected with air, they are beginning to absorb water molecules. This leads to disastrous effects for the hydraulic system from corrosion and end with hydraulic shocks from the system. Additionally, there’s practically no commercial oil additive package required to safeguard the inner surfaces of the hydraulic system from premature aging. With respect to preferences in choosing a specific brand of liquefied petroleum, in this issue can depend, as they say, to your preference. The fact that no significant differences in the composition of a class of oils from different manufacturers isn’t noticed. Basic kits additives all businesses are all the same. Producers of base oil in the world isn’t too much. The difference in construction, needless to say. Each manufacturer Strives to make sure, to highlight some of the critical characteristics of its petroleum.
One relies on the temperature properties, another – the increased protection against rust, and also the third – an increased service life and so forth. It’s nuances. Hydraulic oils created in USA, which are placed on the market without sign of the brand, which are said. So even in the event that you make a choice in favor of oils class VMGZ or even MGE, it is better to buy products of the leading USA producers. The selection in favor of this brand is often due to the price of the technology itself. The difference in price between one class of oils from other manufacturers can be up to 20\%. As a rule, owners of expensive new cars prefer not to save on oil, especially during the warranty period, they are made to accept these oils that are being given in the dealership service center. Clients and owners of imported automobiles favored lubricants market leaders and foreign manufacturers an average price section. The main rule when choosing a used oils – is, first of all The producers directions techniques, which focus mainly on generally accepted international standards (SAE, ISO.) ; and secondly, of all the products that meet the stated requirements, give preference to the most authoritative brand and reliable supplier. Otherwise, a malfunction of hydraulic systems. Currently “Select Lubricants” producer of hydraulic oil string SL-Hydraulic, applicable in all circumstances, if you need a high-quality dependable hydraulic oil with high viscosity index and ability to work in a broad range of temperatures and pressures from the most adverse climatic conditions. In summer and winter.
Hydraulic oil shouldn’t be utilized year round. Especially in regards to second-hand machinery. In heels using a high degree of use of the gaps between the friction components are larger. If the winter oil is used and a viscosity at strong heating gets quite low, the pump operation will decrease drastically. The oil pumped will only spill out between the plunger and the pump casing. This reduces not only the pump efficiency, but also the stress within the system. Using winter fluid in summer may cause lubrication failure of the pump because of its low pumpability. This is especially true in the gear, which can be equipped with strong hydraulic pumps (cranes, concrete pumps, excavators, etc.). Some “artisans” to decrease the viscosity of the frozen oil pour into the hydraulic system a specific quantity of diesel fuel. This contributes to a very disastrous consequences. The simple fact that if the hydraulic system, regardless of the existence of antifoaming oil additive in the hydraulic fluid air bubbles are formed. With heavy use oil boils. If oil is present at the fuel, the inside of bubbles are almost prepared fuel-air mixture. When compressed oil from the hydraulic cylinders happens the exact same procedure as that in the diesel engine: at vials mixture under pressure ignites and fast destroys hydraulic cylinders. Skilled, mend hydraulics, at isolating the cylinders very often come across melted seal – so this is the end result of the addition of “diesel fuel” from the oil. The rules of the Employees ‘hygiene’ Instructions for replacing the hydraulic fluid are provided by just about all machines producers.
Regrettably, not everyone reads and comply with them. Allow me to remind you the basic rules. The oil must be stored in clean shut canister. Prior to pouring new oil in the hydraulic tank, remove all of the dirt that has settled in it for the last few months of operation. Oil should should be poured in clean containers only. Hydraulic systems need to refuel oil pump, not fill. In this instance, the likelihood of dirt from the surface of the container to the machine is greatly reduced. Filling the hydraulic system should be through diesel generator components the filter, since the purity of the liquid even in the original container doesn’t necessarily meet the needs of hydraulic equipment. The oil that is contacted with atmosphere, cannot be stored for over a couple of decades. In case it turned out that it needed to be drained from the hydraulic system, which has not had time to exercise its term (that often happens at various breakdowns hydraulics), then before you pour it back it doesn’t hurt to examine its characteristics. It isn’t too costly. When it comes to heavy equipment with big gas volumes, this process is justified.