The Ultimate Buyer's Guide for Purchasing Custom 25T Hook-Arm Garbage Truck

Hook lift safety & operations are essential. Reading and following the different cautions and understanding the step-by-step hook lift operation will lead you to safe and efficient use of the equipment, reducing the risk of accidents or damage. Hooklifts are important in a variety of sectors, providing adaptable and effective methods for transferring large objects. However, like with any powerful gear, they have inherent hazards. Safety during hook lift operations is key, and identifying essential warning signals is an important part of keeping a safe working environment. Here are the most important safety warning indicators for using a hook lift.

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Working on the Hooklift Safety & Operation

Never operate underneath a hook lift without using the tip supports. Before starting any work, make sure that the body has been removed from the hook lift and that the tip supports are correctly positioned to support the hook lift.

Refer also to 'Hook lift Operation: Improving Efficiency and Safety'

Park the Hooklift before driving the Vehicle

Before driving you must know the hook lift safety & operations. Before driving the vehicle, make sure the hook lift is correctly parked. Failure to do so may cause considerable harm or damage. If the hook is not parked, it poses a significant risk of coming into touch with its surrounding 

Risk of slippage

When operating the vehicle, keep in mind that there is a possibility of slipping, which might result in harm.

Suspended Loads

Avoid standing or walking beneath a dangling burden. If a hanging load comes loose, it can cause significant damage or death.

Risk of being Trapped

Be advised that there is a severe risk of being stuck when driving the vehicle. Before operating the vehicle and equipment, always make sure that no one is injured.

Extended-Tipping-Cylinders

Before using the emergency operation feature, make sure the hook lift has extended tip cylinders.

Warning! It is not possible to operate the tip cylinders to their bottom position with a full stroke. The rear portion will collide with the piston rods.

1. Every day, before the operation of the hook lift, inspect and verify that no objects have fallen in between the hook lift's tipping components.
2. Before using the hook lift, always ensure that the vehicle is on a level and sturdy surface. Failure to do so might cause the vehicle to become unevenly loaded, resulting in tipping over. If the vehicle leans two degrees or more, it may topple over.
3. Before retrieving a body, make sure that the body bracket is intact. Ensure that the hook on the hook lift is properly engaged with the body's bracket, as shown in the illustration on the opposite side. If the hook lift has a safety hook (LA models only), be sure to secure it carefully.
4. Do not tip, load, or unload bodies when the vehicle's axles are raised. Before using the hook lift, make sure the axles, if any, are lowered. Do not make any modifications to the hooklift as this can affect its structural properties. If a modification is required, contact JOAB for advice before modifying the hook lift.

Conclusion:

In the fast-paced world of hook lift operations, safety always takes precedence. Operators must understand and recognize critical safety warning signals. This significantly reduces the risk of accidents and equipment problems. Warning signs to watch out for include overload signals, issues with the hydraulic system, structural limitations, mechanical breakdowns, electrical system problems, operator exhaustion, and environmental factors.

A solid safety policy requires regular maintenance, upskilling, comprehensive inspections, and routine maintenance are necessary for a strong safety policy. Providing operators with the ability to identify and respond to warning signs not only protects their safety but also ensures the efficiency and longevity of the hook lift equipment.

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The hooklift is the core system of a demountable truck, determining its overall performance. It allows for loading & unloading with a single vehicle-mounted device. This adaptable system satisfies global client needs and is widely utilized in sanitation, construction, firefighting, transportation, military, and trash recycling. Hooklifts are mainly categorized into four types: small-arm fixed, telescopic, swing arm, and composite. Based on our years of experience, the following are the main process controls in hooklift truck manufacture.

1.Basic structure

The hooklift equipment serves as an important component installed on the truck chassis, primarily for loading and unloading the bin body. The system includes a hydraulic lifting device that unloads the bin body from the hooklift subframe and pulls the bin body onto the subframe. Additionally, this hooklift equipment can self-unload the bin body, provided the hydraulic self-unloading lock is locked during the process. The whole system drives the middle frame to overturn through the main cylinder, the telescopic arm cylinder drives the telescopic arm, and then drives the hook through the lock hook cylinder to complete the whole process of loading and unloading the bin body. Finally, pull the bin body onto the hooklift along the rear roller using the hook and lock it in place with the hydraulic bin lock. The main structure of the hooklift is displayed as follows.

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2. Installation process and control points of hooklift

2.1 Adjust the chassis level

1. Ensure that all wheels are facing forward;
2. Ensure that the tire pressure is normal;
3. To lift the bare chassis, use at least two adjustable brackets. Do not remove the brackets during the chassis modification process.

2.2 Install hooklift subframes

2.3 Connection between hooklift and chassis

2.3.1 Installation of hooklift mounting plates

When placing the hooklift on the chassis main beam, ensure that the contact surface between the hooklift main beam and the chassis's main beam has no gaps. Arrange fixing plates at load-concentrated positions during the movement of the hooklift. Use plates that are 8-12 mm thick for the fixing plates, and choose connecting bolts sized M12-M14. It is recommended that the bolt strength be 10.9 or above.

When drilling holes in the chassis main beam, keep the following points in mind:

1. Use the existing holes on the main beam as much as possible;
2. Before drilling, confirm that no damage or impact will occur to any pipelines and wires.
3. Use a drill bit as close to the bolt diameter as possible for drillin

g, for example, use a 13.9mm drill bit for M14 bolts;

• Do not drill holes at the edge of the side beams;
• Do not drill holes at the tapered end of the towing truck chassis frame;
• Do not weld filler at the holes of the chassis frame;

2.3.2 Shorten the front part of the hooklift subframe

The schematic diagram for shortening is illustrated in Figure 5. For vehicles without rear supporting iron wheels, position the hooklift close to the cab to prevent the truck from tilting forward. The distance from the rear axle center to the center of the hooklift rear roller is detailed in Figure 6. In the figure, L is the distance from the rear axle center to the center of the hooklift rear roller. The shorter L is, the less likely the truck is to tilt its head.

2.4 Installation of the oil pump and drive shaft

If the truck gearbox has an additional take-off device and there is sufficient space between the drive shaft and the crossbeam, you can adopt the method of installing a direct pump additional device. This setup allows for more efficient integration with the hydraulic system. The key is to ensure that the rotation direction of the oil pump and the connection position of the take-off device and the pump match. Since the oil pump typically rotates counterclockwise, if the directions do not align, disassemble the rear cover and rotate it 180° for compatibility. When using a flange take-off device, do not use an adjustable pump; instead, utilize a drive shaft flange. In this scenario, employ a special bracket to attach the flange hub to the oil pump shaft before installing the pump onto the truck chassis. According to the product instructions, the drive shaft bracket must be securely fixed. An adapter can indeed be installed between the pump and the take-off device to facilitate proper connection and function within the hydraulic system. Since the installation positions of the oil pump and valves are adjustable, use flexible hoses to connect the hydraulic system pipelines.

2.5 Installation of oil tank and oil circuit connection diagram

The hydraulic system of the hooklift is a high-pressure connection system with the highest working pressure of 35 MPa. Connect high-pressure hoses between the hydraulic pump and the main control valve, ensuring these hoses do not vibrate. Additionally, install the hydraulic oil tank as high as possible while ensuring the filter element of the return.  Refuel from here by removing the cover. The working principle of the oil circuit is that the hydraulic pump obtains power from the chassis through the take-off device, pressurizes the hydraulic oil in the oil tank into high-pressure hydraulic oil, and then transmits the pressure to the main control valve body through high-pressure oil pipes. The main control valve controls the stroke of various cylinders on the hooklift to realize the loading and unloading operation of the hooklift. Meanwhile, the returned hydraulic oil flows back to the oil tank through the return oil pipe. Refer to Figure 7 for the oil circuit connection diagram.

2.6 Installation of rear axle support

Rear axle supports include 'rear axle support cylinders' and 'rear axle support rollers', which are mainly used to reduce the rear overhang load of the chassis main beam and prevent the truck from tilting its head during hooklift operation.

2.6.1 Rear axle support cylinders

The rear axle support cylinders are suitable for rear axle support forms on softer and harder ground. Pay attention to the following points during installation:

1. There is 1 rear axle support cylinder on the left and right, installed above the steel plate springs of the last axle of the chassis and as far back as possible;
2. In the unloaded state, maintain a distance of 30-50 mm between the fully extended cylinder rod of the support cylinders and the steel plate springs.

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   Do not weld the connecting plates of the rear axle support cylinders to the chassis main beam to allow for easy disassembly of the cylinders.

2.6.2 Rear axle support rollers

1. The rear axle support rollers should be as far back as possible;
2. Usually, when loading and unloading on a horizontal road surface, maintain a ground clearance of 100-150 mm at the lowest point of the rear roller;

Conclusion

In the installation of the hooklift, first ensure that the chassis model matches the hooklift; secondly, strictly implement the consistency requirements of the product in the whole special truck modification process.

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This blog is translated from the article 'Control Points of Hooklift in Manufacturing Process of Hooklift Truck' by Qizhong Yao .

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