Mechanical Translation -- Please help me to correct and polish it. Thank you.

英译汉

Visually and manually inspect the windshield wiping and washing cleaning system controls to determine if they are accessible.

Visually and manually inspect the windshield washer system cleaning/cleaner fluid reservoir to ascertain make sure that the reservoir filler opening is readily easily accessible and can be filled without the use of specialized tools or special filling equipment.

Clean the windshield glazing surface of the test vehicle with a nonabrasive type cleaner, and position the test vehicle in a the test area containing the water spray system.

Install a the wiper cycle counting device in the windshield wiping cleaning system as shown in Figure 1 below. Install a tachometer or equivalent engine r.p.m. to monitoring the instrumentation. The tachometer shall can be capable of being monitored during the testing in  from within the vehicle.

检查挡风玻璃刮水和洗涤系统控制以确保其可以使用。

检查挡风玻璃洗涤系统清洗液罐，以确保清洗液罐注口畅通，可以在不使用其他工具或注入设备的情况下使用。

使用防磨损型清洗剂清洁试验车釉面，并将试验车停放在喷水系统的试验区。

在挡风玻璃刮水系统上安装刮水周期计算装置（如下图1所示）。安装测速计转速计或其他测量引擎每分钟转速的监测仪表。在试验期间转速计应从车内可监测。

汉译英

机械转向机型在转向时，向后拉左侧转向手柄，拉杆带动转向拨叉摇臂，使转向拨叉转动，拨动转向齿轮与中央齿轮牙嵌分离；当拉杆继续推动时，转向拨叉继续拨动转向齿轮压紧多片湿式制动器，摩擦片摩擦、抱死，产生制动力矩，左侧（或右侧）驱动轮停止转动，机器实现左转（或右转）。

 The Chinese here is too technical for my undestanding.  I cannot understand well from the English to know what you are describing and cannot guess because of the misleading meaning of the words you used.  So can't help you here in this paragraph.  Are you talking about how the gears work as you slow down the car to make a turn?

During steering of steering type, the pilot should pull back the left steering handle. The pitman arm of the steering fork driven by the pull rod, the steering fork starts to rotate subsequently, which thus makes the steering gear separates from the central gear. Driven by the pull rod continuously, the steering fork keeps rotating the steering gear, which presses on the wet multi-disc brake. The brake lining is locked, producing braking torque. Left (or right) driving wheel stops and the machine, therefore, manages to turn left (or right).
注意：转向时，要快速拉动转柄，使转向齿轮分离迅速、彻底；否则，会加剧牙嵌离合器的磨损，长时间分离不彻底，会造成转向失灵。

Although quite accurate in translation, I don't think this is the way it is expressed in English. If I think you are talking about the gear and clutch of a car...

Attention: During steering, please pull the steering handle quickly enough to separate the steering gear fast and completely. Otherwise, the friction of jaw clutch would be exacerbated. Over time. incomplete separation of the steering gear would result in the failure of steering.  

During manual transmission, the shifter should be engaged quickly enough to have the gears detached completely.  If not, over time the teeth of the gears will erode and will no longer become effective.