Howo Electrical System

If the truck speedometer is not working on your Howo truck, there are a few steps you can take to troubleshoot and resolve the issue:

1. Check the connections: Ensure that all the electrical connections related to the truck  speedometer are secure and properly connected. Look for any loose or damaged wires that may be causing the problem.
2. Inspect the speed sensor: The speed sensor is responsible for sending signals to the truck speedometer. Locate the speed sensor, usually located on the transmission or the rear differential, and check for any signs of damage or corrosion. Clean or replace the sensor if necessary.
3. Verify the truck speedometer cable: If your Howo truck uses a mechanical speedometer, check the cable connecting the transmission to the back of the truck speedometer. Ensure that the cable is not frayed or broken. Replace the cable if needed.
4. Test the truck speedometer gauge: To determine if the issue lies with the truck  speedometer gauge itself, you can perform a simple test. Remove the truck speedometer from the dashboard, reconnect it temporarily, and test it using a portable drill. If the truck speedometer needle moves, it indicates that the gauge is functioning properly.
5. Consult a professional: If the above steps do not resolve the issue, it is recommended to consult a professional technician or contact the Howo truck manufacturer for further assistance. They will have access to specialized diagnostic equipment and expertise to accurately diagnose and fix the problem.
6. Remember to exercise caution while performing any troubleshooting steps and, if unsure, seek professional help to avoid causing further damage to your Howo truck.

To replace the injector pump in a Sino truck, follow these general steps:

1. Preparation:
   – Gather the necessary tools, including wrenches, sockets, pliers, and a torque wrench.
   – Ensure you have a replacement injector pump that is compatible with your Sino truck model.
   – Park the truck on a level surface and engage the parking brake.
   – Disconnect the truck’s battery to prevent any electrical mishaps during the replacement process.
2. Access the injector pump:
   – Locate the injector pump, which is typically positioned on the engine block.
   – Remove any components that obstruct access to the pump, such as air intake components or brackets.
   – Take note of the orientation and connections of the current injector pump for reference during installation.
3. Disconnect fuel lines and electrical connections:
   – Carefully remove the fuel lines connected to the injector pump, taking note of their respective positions.
   – Disconnect any electrical connections or wiring harnesses attached to the pump.
   – Label or photograph these connections to ensure proper reattachment later.
4. Remove the old injector pump:
   – Loosen and remove the bolts or mounting hardware securing the injector pump to the engine block.
   – Gently pry the old pump away from the engine block, being cautious not to damage any surrounding components.
5. Install the new injector pump:
   – Clean the mounting surface on the engine block to ensure a secure fit for the new pump.
   – Position the replacement injector pump onto the engine block, aligning it correctly with the mounting holes.
   – Secure the pump in place using the appropriate bolts or mounting hardware.
   – Reconnect the fuel lines and electrical connections to the new injector pump, referring to your earlier notes or reference photographs.
6. Double-check and test:
   – Ensure all connections are properly secured and tightened.
   – Reconnect the truck’s battery.
   – Start the engine and monitor for any leaks or irregularities in fuel delivery.
   – If everything appears to be functioning correctly, take the truck for a test drive to verify the successful replacement of the injector pump.
7. It’s important to note that these steps provide a general overview, and the specific procedure may vary depending on the Sino truck model and the type of injector pump being replaced. Consulting the vehicle’s service manual or seeking assistance from a qualified mechanic with experience in Sino trucks is highly recommended to ensure a proper and safe replacement.

If you have recently replaced the head gasket on your engine and are experiencing a loss of power, there are several potential factors to consider:

1. Improper head gasket installation: If the head gasket was not installed correctly during the replacement process, it can lead to issues such as combustion leaks, reduced compression, or improper sealing. Double-check the installation process and make sure the head gasket is seated properly and torqued to the manufacturer’s specifications.
2. Cylinder head issues: If the cylinder head was not inspected or repaired properly before installing the new head gasket, it can contribute to power loss. Check for any cracks, warping, or damage on the cylinder head. In some cases, a damaged cylinder head may need professional machining or replacement.
3. Valve-related problems: If the valves were not properly adjusted or are not sealing correctly, it can result in power loss. Make sure the valve clearances are within the specified range and that the valve timing is accurate.
4. Intake or exhaust system restrictions: Check for any obstructions or restrictions in the intake or exhaust system. A clogged air filter, exhaust manifold, or catalytic converter can limit airflow and lead to decreased engine power. Ensure that all components are clean and free from blockages.
5. Fuel and ignition system issues: Verify that the fuel injectors are clean and functioning properly. Dirty or faulty injectors can disrupt fuel delivery and affect engine performance. Additionally, check the ignition system components such as spark plugs, ignition coils, and ignition timing to ensure proper operation.
6. Other potential causes: There could be other underlying factors contributing to the power loss, such as a malfunctioning sensor, a faulty fuel pump, a restricted fuel line, or a problem with the engine management system. It may be necessary to perform further diagnostics or seek professional assistance to identify and address these issues.
7. If you’ve followed the proper procedures during the head gasket replacement and are still experiencing power loss, it is recommended to consult a qualified mechanic or contact the manufacturer for specialized guidance. They will have the expertise to diagnose and resolve the problem effectively.

I’m sorry to hear that you’re experiencing starting issues with your Sinotruk 336 truck. Start problems can have various causes, but here are a few troubleshooting steps you can follow:

1. Check the battery: Ensure that the battery is fully charged and in good condition. Check the battery terminals for any corrosion or loose connections. Clean the terminals if needed.
2. Inspect the starter motor: The starter motor is responsible for cranking the engine. Check if you hear any clicking sounds when attempting to start the truck. If you hear clicks but the engine doesn’t turn over, it could indicate a faulty starter motor or a weak connection. Consider having the starter motor tested or inspected by a professional.
3. Fuel delivery: Ensure that there is an adequate supply of fuel reaching the engine. Check the fuel gauge to make sure there is sufficient fuel in the tank. If you suspect a fuel delivery issue, it’s recommended to have a mechanic check the fuel pump, fuel filter, and fuel lines for any blockages or malfunctions.
4. Ignition system: Check the ignition system components, including spark plugs, ignition coils, and ignition wiring. Ensure that the spark plugs are clean and in good condition. If any components are damaged or worn out, replace them accordingly.
5. Engine immobilizer: Some vehicles are equipped with an immobilizer system that requires a specific key or code to start the engine. Make sure you’re using the correct key and that it is functioning properly. If you suspect an issue with the immobilizer system, consult a professional or contact the manufacturer for assistance.
6. If these troubleshooting steps don’t resolve the starting issue, it’s recommended to have a qualified mechanic or an authorized Sinotruk service center inspect and diagnose the problem. They will be able to use diagnostic tools and their expertise to identify the specific issue and provide the necessary repairs.

If you have dismounted the 8th gear of your Sinotruk HOWO transmission and it is not engaging properly or “hooking,” there could be several potential causes for this issue:

1. Incorrect gear installation: Double-check the installation process to ensure that the gear was correctly positioned and aligned with the transmission shaft. It’s crucial to follow the manufacturer’s specifications and guidelines for proper gear installation.
2. Damage or wear on the gear or synchronizer components: Inspect the gear teeth and the corresponding synchronizer components for any signs of damage, wear, or excessive clearance. Worn or damaged components can prevent the gear from fully engaging or cause it to slip out of gear.
3. Problems with the shift fork or shift mechanism: The shift fork and associated mechanism are responsible for engaging and disengaging gears. If there are issues with the shift fork or the linkage, it can result in incomplete gear engagement. Check for any wear, damage, or misalignment in these components.
4. Incorrect gearbox adjustment: Improper adjustment of the transmission linkage or cables can hinder the smooth shifting and proper engagement of gears. Ensure that the gearbox linkage is adjusted according to the manufacturer’s recommendations.
5. Faulty synchronizer ring or hub: The synchronizer ring and hub are responsible for matching the rotational speeds of the gears during shifting. If the synchronizer ring or hub is faulty, it can cause difficulties in gear engagement. Inspect these components for wear, damage, or misalignment.
6. Internal transmission issues: There may be internal transmission issues such as bearing wear, worn synchromesh assemblies, or damaged gears that could be contributing to the problem. In such cases, it is recommended to have a professional mechanic or a certified Sinotruk service center inspect and diagnose the transmission for any internal faults.
7. It is important to address any issues with the transmission promptly to prevent further damage or potential safety risks. If you’re uncertain about performing the repairs yourself, it’s advisable to seek professional assistance to ensure the proper functioning of the transmission.

The recommended duration for changing the engine oil and oil filters in a Sinotruk HOWO truck can vary depending on several factors, including:

1. Manufacturer’s recommendations: It is always best to consult the vehicle’s manufacturer or refer to the owner’s manual for specific guidelines on oil change intervals. The manufacturer will typically provide recommendations based on factors such as engine type, operating conditions, and oil type.
2. Normal driving conditions: Under normal driving conditions, oil change intervals for commercial vehicles like the Sinotruk HOWO can range from 10,000 to 15,000 miles (16,000 to 24,000 kilometers) or once every six months, whichever comes first. However, it is important to note that these are general guidelines, and it is still advisable to follow the manufacturer’s recommendations for your specific model.
3. Severe driving conditions: If your HOWO truck operates under severe driving conditions such as frequent stop-and-go traffic, towing heavy loads, driving in dusty environments, or prolonged idling, it may be necessary to change the engine oil and oil filters more frequently. In such cases, the intervals might be shortened to around 5,000 to 7,500 miles (8,000 to 12,000 kilometers) or once every three to four months.
4. Remember, regular maintenance is essential for the optimal performance and longevity of your vehicle. Apart from adhering to the recommended oil change intervals, it’s also important to monitor the oil levels regularly and check for any signs of contamination or degradation. If you’re unsure about the intervals or have specific concerns about your vehicle, it’s always recommended to consult a qualified mechanic or contact a Sinotruk service center for expert advice.