All actions of dynamic compaction machine are realized by hydraulic system. The relationship between hydraulic system and hydraulic oil is just like the relationship between human body and blood. The viscosity of hydraulic oil is directly related to temperature, and the viscosity will increase with the decrease of temperature.

液压油正常的工作温度为20℃-80℃之间，油温越低，液压油粘度就越大，会造成流动性差、阻力大、工作效率低等现象。如果油温低于20℃，急速运转甚会直接损坏泵、马达、阀等液压元件。因此，使液压油达到正常的工作温度后再正常施工是非常必要的。

The normal working temperature of the hydraulic oil is between 20 ℃ and 80 ℃. The lower the oil temperature is, the greater the viscosity of the hydraulic oil will be, resulting in poor liquidity, high resistance and low work efficiency. If the oil temperature is lower than 20 ℃, rapid operation will even directly damage the pump, motor, valve and other hydraulic components. Therefore, it is very necessary to make the hydraulic oil reach the normal working temperature before normal construction.

强夯机冬季用车预热须知：

Warm up instructions for dynamic compaction machine in winter:

一、要求：

1、 Requirements:

强夯机冬季施工前必须按步骤预热，待液压油温度达到20℃以上,发动机水温达到60℃以上才能开始正常施工，预热时长约20分钟（具体时间按照实际操作步骤达到以上作业标准为准）。

The dynamic compaction machine must be preheated step by step before winter construction. The normal construction can only be started when the hydraulic oil temperature reaches above 20 ℃ and the engine water temperature reaches above 60 ℃. The preheating time is about 20 minutes (the specific time shall be subject to the above operation standard according to the actual operation steps).

二、预热操作步骤：

2、 Preheating operation steps:

①主机打火，不做任何动作，让发动机怠速（800转左右）下无负荷运转约5分钟；

① The main engine ignites, does not do any action, let the engine idle speed (about 800 RPM) no-load operation about 5 minutes;

②踩油门，使发动机中速（1400转左右）无负荷运转约5分钟；

② Step on the accelerator to make the engine run at medium speed (about 1400 RPM) without load for about 5 minutes;

③打开先导开关，保持发动机中速（1400转左右）无负荷状态，慢慢动主卷、变幅（手柄推或拉一半位置）动作，各循环5次，使液压油在系统内充分循环；

③ Turn on the pilot switch, keep the engine in medium speed (about 1400 RPM) no-load state, slowly move the main coil and luffing (push or pull the handle to half position) for 5 cycles, so that the hydraulic oil can be fully circulated in the system;

④踩油门，使发动机全速无负载运转5分钟；

④ Step on the accelerator to make the engine run at full speed without load for 5 minutes;

⑤重复步骤③。重复一次后，可全速提升主卷看动作是否缓慢，如缓慢则继续重复步骤③，但是注意操作要缓慢拉动手柄到大位置，因为此时的设备性能还不稳定；

⑤ Repeat step 3. After one repetition, the main coil can be raised at full speed to see if the action is slow. If it is slow, continue to repeat step 3, but pay attention to the operation, and slowly pull the handle to the large position, because the performance of the equipment is not stable at this time;

⑥在发动机怠速无负荷状态下，操作回转，顺时针、逆时针各转3圈；

⑥ When the engine is idling and no-load, rotate clockwise and counterclockwise for 3 turns;

⑦在发动机中速（1400转左右）无负荷状态下，操作行走，先前进10s、再后退10s，如此循环约2分钟；

⑦ In the medium speed (about 1400 RPM) no-load state of the engine, operate the walking, first forward for 10s, then backward for 10s, so as to cycle for about 2 minutes;

⑧观察显示屏，油温达到20℃即可正常施工（如温度还在20℃以下，继续重复步骤③直温度达到20℃即可）。

⑧ Observe the display screen, and the oil temperature reaches 20 ℃ before normal construction (if the temperature is still below 20 ℃, continue to repeat step ③ until the temperature reaches 20 ℃).

预热过程中如果发动机水温上升缓慢，可以使用纸板等硬质平面材料将散热器进风面挡住（一般挡在发动机散热器前端），这样可以让发动机水温快速上升，达到60℃后去掉挡板。

During the preheating process, if the engine water temperature rises slowly, you can use cardboard and other hard flat materials to block the air inlet surface of the radiator (generally in front of the engine radiator), so that the engine water temperature can rise rapidly, and remove the baffle when it reaches 60 ℃.