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Usage and Operation of Vacuum Sewage Suction Truck

Commissioning a New Vehicle

When commissioning a new vehicle, follow the original chassis user manual and this manual’s requirements. Ensure thorough inspection, maintenance, and lubrication during the break-in period.

If you have a need to purchase an Vacuum Sewage Suction Truck, visit the Vacuum Sewage Suction Truck product list immediately.

Starting and Running the Oil Pump and Vacuum Pump

Complete all preparations for commissioning the new vehicle, ensure oil and water are sufficient, fully open the ball valve on the oil suction pipe, and start the engine to bring the pressure gauge to 6MPa. At this point, turn the control knob on the lower right side of the driver’s seat clockwise to engage the power take-off, causing the oil pump to start. Push the corresponding handle of the multi-way valve forward to pressurize the hydraulic oil into the oil motor, directly driving the vacuum pump.

Lifting, Pausing, and Lowering the Tank

Push the handle of the lifting cylinder forward to allow hydraulic oil to enter the lower part of the lifting cylinder through the multi-way valve, lifting the tank to a 40° angle. When the handle is in the middle position, the tank can stay at any inclination between 0° and 40°. Pull the handle back to connect the lower part of the lifting cylinder to the return pipe, and the tank will lower by its own weight. When the tank lowers to an inclination of 3°, the buffer action of the cylinder will slow the descent until the tank smoothly rests on the frame.

Opening, Closing, and Locking the Cover

Before opening the cover, completely unlock the locking devices on both sides of the tank. Then push the handle of the multi-way valve forward, allowing hydraulic oil to enter the upper part of the cover cylinder, shortening the cylinder and gradually opening the cover to about a 90° angle. The hydraulic system includes a hydraulic control check valve to prevent the cover from descending due to gravity after opening.

To close the cover, operate the oil pump, pull the multi-way valve handle backward, allowing hydraulic oil to enter the lower part of the cylinder. Simultaneously, high-pressure oil enters the hydraulic control check valve piston end, pushing the check valve, allowing hydraulic oil in the upper cylinder to return to the oil tank, and the cover slowly lowers under control until it is closed.

After closing the cover, press down the locking device handles on both sides and use a lever to force the wedge pins into the cover tension bolts, locking the cover. To ensure a tight fit between the cover and tank flange, the vacuum system can be activated to create a vacuum inside the tank and fully insert the locking pins for a secure lock.

Suction Operation

Close and lock the cover, close the sewage valve, manhole cover, and cleaning handhole, open the suction valve, insert the suction hose into the pit, push the four-way valve handle to the suction position (Figure 16), engage the power take-off to drive the vacuum pump, and control the pump speed below 500 RPM. The sludge will be sucked into the tank. When the tank reaches 90% capacity, the full load alarm will sound, and the vacuum pump should be stopped, the suction valve closed, the suction hose removed, and the four-way valve handle set to the middle position.

Tilting Discharge

Open the cover to a suitable position, allowing the material to flow out automatically. Simultaneously, lift the tank, ensuring the material and residues are discharged completely due to the automatic cleaning device. After discharge, clean the flange surface to facilitate closing the cover.

When loading sewage, the sewage valve can be opened to allow gravity discharge.

Pressure Discharge (Avoid Using When Possible)

Before pressurizing, ensure: ① the safety valve operates normally with an opening and closing pressure of 0.06MPa (0.6kg/cm²); ② the cover is closed and locked on both sides; ③ the sewage valve is open; ④ the discharge height is less than 3m. Connect the discharge pipe, operate the vacuum pump, and set the four-way valve to the pressure position to discharge sewage.

Tank Cleaning

After discharging sewage, there may be some residue at the tank bottom, which can be manually washed periodically as needed. During washing, open the cover, lift the tank to a 15° angle, open the cleaning handhole, and use a high-pressure water gun (self-provided) to wash the interior from front to back, allowing the residue to be flushed out.

Full Load Alarm

Before starting suction operations, pull out switch K1 at the bottom of the instrument box to enable the alarm system. When the sewage level reaches a certain height, the float rises, the pushrod ascends, the reed switch k2 engages, and the liquid level switch k3 is activated, triggering the alarm. Operators should promptly stop suction and push switch K1 to cut off the power to prevent continuous alarm sound. If the tank has not reached the full load height before the alarm, stop suction when the alarm sounds and push switch K1 to cut off the alarm power, allowing the vehicle to drive. Repeat the above operation for the next task.


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