Small mixers are indispensable for transportation in some industries, but recently many users have asked us why their work efficiency is getting lower and lower. The reason for this may be that they are not maintained in time, or that they are not maintained correctly. I believe the latter should account for a large proportion, So what are the specific maintenance taboos? Let's take a look at our detailed introduction to Longzhuang industry and trade.

1、忌機油只加不換

1. Avoid only adding oil without changing it

機油在柴油機的使用中是必不可少的，主要作用是潤滑、冷卻、清潔等。因此，很多小型混凝土攪拌車駕駛員都會注意檢查潤滑油的油量，且按標準添加，但是卻忽略了潤滑油質量的檢查和對已經變質機油的及時更換，而導致一些發動機的運動機件總是在較差的潤滑環境中運轉，加速了各機件的磨損。一般在正常情況下機油的損耗并不是很大，但是卻極容易產生污染，而失去保護柴油機的作用。

Engine oil is essential in the use of diesel engine. Its main functions are lubrication, cooling, cleaning and so on. Therefore, many small concrete mixer drivers pay attention to check the oil quantity of lubricating oil and add it according to the standard, but ignore the inspection of lubricating oil quality and the timely replacement of deteriorated oil, resulting in some moving parts of the engine always operate in a poor lubrication environment, accelerating the wear of various parts. Generally, under normal circumstances, the loss of engine oil is not very large, but it is very easy to produce pollution and lose the role of protecting diesel engine.

在柴油機運轉的過程中，許多污物(燃油不完全燃燒而生成的碳煙、積炭和積垢等)都會進入到機油中。對于新的或大修后的機械，試運轉后雜質就會更多，如果只加不換就投入使用，容易引起燒瓦、抱軸等意外事故。

During the operation of the diesel engine, a lot of dirt (soot, carbon and dirt generated by incomplete combustion of fuel) will enter the engine oil. For new or overhauled machinery, there will be more impurities after commissioning. If it is put into use without replacement, it is easy to cause accidents such as tile burning and shaft holding.

2、混凝土商砼車忌缸套和活塞新品不經選配即安裝

2. It is forbidden to install new cylinder liners and pistons without selection

在換裝汽缸套和活塞時，認為新的汽缸套和活塞都是標準件，具有互換性，裝上去就能使用了。而實際上，汽缸套與活塞的尺寸都是有一定的公差范圍。如把大尺寸的汽缸套配上小尺寸的活塞，會使配合間隙太大，造成壓縮無力，而啟動困難。

When replacing the cylinder liner and piston, it is considered that the new cylinder liner and piston are standard parts with interchangeability, which can be used after installation. In fact, the dimensions of cylinder liner and piston have a certain tolerance range. If the large cylinder liner is matched with the small piston, the matching clearance will be too large, resulting in weak compression and difficult start.

因此，小型混凝土攪拌車在換裝前一定要檢查標準缸套與活塞的尺寸分組代號，裝用的缸套與活塞必 須使標準活塞的尺寸分組代號與標準缸套的尺寸分組代號一樣，這樣才能保證兩者之間具有標準的配合間隙。

Therefore, before the replacement of small concrete mixer truck, the size grouping code of standard cylinder liner and piston must be checked. The installed cylinder liner and piston must make the size grouping code of standard piston the same as that of standard cylinder liner, so as to ensure that there is a standard fit gap between them.

3、水泥運輸車忌不檢查柱塞行程余量

3. Do not check the plunger stroke allowance of cement truck

在柱塞式噴油泵的調試過程中，有很多維修人員不注意檢查柱塞的行程余量。所謂柱塞的行程余量，就是指柱塞被凸輪軸上的凸輪頂上止點后，能繼續上行的移動量。調好小型混凝土攪拌車的供油開始時間后，之所以要檢查行程余量，是因為柱塞的行程余量與柱塞和套筒的磨損有關。

During the commissioning of plunger fuel injection pump, many maintenance personnel do not pay attention to checking the stroke allowance of plunger. The so-called stroke margin of the plunger refers to the amount of upward movement of the plunger after it is pushed to the top dead center by the cam on the camshaft. After adjusting the oil supply start time of the small concrete mixer, the reason to check the travel allowance is that the travel allowance of the plunger is related to the wear of the plunger and sleeve.