(Covers axle-vehicle adaptation, installation precautions, and tool requirements)

Q: Can I reposition the oil filler port on the rear axle?

A: The oil filler port position is fixed and cannot be changed. If the current location is difficult to access, we recommend adjusting the motor mounting direction. Alternatively, you can fill oil through the M10 breather hole.

Q: Do I need special tools to install the rear axle?

A: We recommend using a torque wrench to ensure secure bolt fastening. Please refer to the installation manual for specific tool requirements.

Q: How can I check if the rear axle is installed at the correct angle?

A: After installation, measure the angle between the axle and the horizontal plane. Ensure it is within the ±3° tolerance specified in the installation manual.

Q: Is your rear axle compatible with modified or aftermarket wheel hubs?

A: Please provide wheel hub specifications such as ET value and center bore diameter. We will evaluate compatibility accordingly.

Q: Can the axle be matched with third-party electric motors?

A: Yes, please provide motor interface dimensions and torque specifications so we can verify flange compatibility.

Q: Does battery weight affect the selection of rear axle model?

A: Yes, battery weight contributes to the vehicle's total load. Please provide the total weight of the battery pack when selecting an axle.

Q: Where can I download the technical drawings of your axle products?

A: Contact our customer service to receive them by email.

(Covers drum/disc brake types, diagnostics, replacement, and noise troubleshooting)

Q: Will the size of the caliper and brake disc affect wheel installation?

A: Please provide wheel drawings or 3D models so we can check whether the outer dimensions of the caliper and disc will interfere with the wheel structure.

Q: What is a drum brake on the rear axle?

A: A drum brake system is located inside the wheel. Brake shoes press outward against the drum to create friction and stop the vehicle—similar to pressing outward inside a rotating barrel.

Q: What is a disc brake on the rear axle?

A: A disc brake system is mounted outside the wheel. Calipers squeeze the disc to generate friction—like clamping down on a spinning plate with pliers.

Q: How do I choose between drum brakes and disc brakes for my vehicle?

A: Drum brakes are ideal for low-speed, light-load vehicles due to lower cost and easier maintenance.
Disc brakes are better for high-speed or heavy-duty applications, offering superior braking performance and safety.

Q: How can I tell if the brake pads are worn out?

A: For disc brakes, visually inspect pad thickness—if less than 2mm, they should be replaced. For drum brakes, disassembly is needed to inspect the brake shoes.

Q: What causes abnormal noise in the brake system?

A: Common reasons include uneven brake pad wear, foreign objects, or improper installation. We recommend contacting after-sales support for inspection.

Q: How should I clean the brake system?

A: Use non-corrosive cleaners to rinse the brake disc or drum. Avoid any contamination of the friction surfaces with lubricants or oil.

Q: Can I order custom-size brake discs?

A: Custom-sized brake discs are currently not supported.

(Focusing on worm gear structure, working principles, application scenarios, and maintenance)

Q: What is a worm gear parking brake and how does it work?

A: A worm gear is a spiral-shaped component similar to a threaded screw. In parking systems, it engages with a gear to generate friction and lock the wheels in place, preventing vehicle movement.

Q: How does the worm gear parking mechanism operate?

A: During parking: The worm rotates, meshing with the worm wheel to generate static friction, thereby locking the wheel (analogous to tightening a screw-nut assembly for rigid fixation).
To release: The worm reverses rotation, disengaging from the worm wheel to eliminate friction, restoring wheel mobility (similar to loosening a screw-nut assembly).

Q: Which types of vehicles use worm gear parking brakes?

A: Electric vehicles: such as electric tricycles, golf carts, etc.
Industrial equipment: such as forklifts, AGV carts, etc.

Small vehicles: such as low-speed scooters, logistics vehicles, etc.

Q: Does the worm gear parking brake require regular lubrication?

A: Yes, we recommend inspecting the worm gear assembly every 6 months and applying high-temperature grease to ensure proper function.

(Focusing on lubricant selection, refilling, replacement intervals, and servicing)

Q: What type and amount of gear oil should be used for the rear axle?

A: API: GL-4 SAE 85W-90 for warm or hot environments
API: GL-4 SAE80W-90 for cold environments
The amount of lubricant is between 0.6 and 1L, depending on the installation posture. Please confirm the final installation posture first.

Q: How often should the gear oil be replaced?

A: First Replacement: After 3,000 km or 60 days from first running (whichever comes first)
Future Replacement Frequency: Every 5,000 km or 6 months (whichever comes first）

Q: What should I do if the axle is leaking oil?

A: Stop the vehicle immediately and inspect all seals. You may temporarily use sealant, but contact maintenance support as soon as possible for proper repair.

Q: What could cause unusual noise from the rear axle during driving?

A: Possible causes include bearing damage, excessive gear clearance, or insufficient lubrication. Please have the axle inspected by a technician.

(Covers leaf spring seat definition, installation key points, and vehicle compatibility)

Q: What is a leaf spring seat and how does it relate to the leaf spring?

A:The leaf spring seat is a bracket for fixing the leaf spring and is installed on the axle. Its functions are:
1. Fix the leaf spring to prevent it from shifting or falling off.
2. Disperse the pressure on the leaf spring to protect the axle.
3. Extend the service life of the leaf spring and axle.

Q: What should I pay attention to when installing leaf springs and spring seats?

A:Installation Notes:
1.Ensure that the leaf spring and its mounting seat are properly matched, with the correct size and model.
2.Use specialized tools for securing to avoid any loosening.
3.After installation, check that everything is firmly in place and conduct a test drive.

Q: What types of vehicles are your leaf springs and seats compatible with?

A: Our leaf springs and seats are suitable for various vehicles such as trucks, cargo vans, and trailers. We can recommend the appropriate models based on your vehicle specifications.

(Covers warranty policies, response time, installation support, and service protocols)

Q: What is the maximum load capacity of your rear axles?

A: The maximum load capacity ranges from 1 ton to 6 tons, depending on the specific rear axle model.

Q: What is your warranty period, and what conditions are not covered?

A: We offer a 2-year warranty for OEM applications. Damage caused by unauthorized modification or misuse is not covered.

Q: How fast is your after-sales response?

A: We respond to domestic customers within 24 hours and provide solutions to overseas customers within 48 hours.

Q: Do you offer on-site installation support?

A: We primarily provide remote technical guidance. For bulk orders, on-site installation support can be arranged with a 7-day advance request.

Q: What is the continuous operating efficiency for typical urban driving (frequent stop-and-go)?

A: Our electric powertrain systems are engineered for urban EV applications with frequent start-stop traffic. The PMSM motors we use achieve peak energy efficiency of 93–94%, depending on overall vehicle integration and drivetrain calibration.

Q: What battery specifications are recommended (voltage, chemistry, BMS requirements)?

A: For a 10kW EV powertrain, we recommend a 96V lithium battery pack to maximize energy efficiency. 72V is also supported. The recommended battery management system (BMS) parameters, such as cutoff voltage and current ratings, are finalized during system matching and vehicle performance planning.

Q: Can your electric powertrain system support 72V, 84V, and 96V packs without hardware modifications?

A: Yes. Our EV motor and axle hardware support 72–96V ranges without change. The motor controller (MCU) is also compatible, though for 72V, we offer a cost-optimized version. The axle remains unchanged.

Q: How flexible is the MCU for customizing torque curves, acceleration, and regenerative braking?

A: Our motor controllers for EVs are fully programmable for torque mapping, acceleration response, and regenerative braking strength. Advanced tuning support is available upon request (may incur service fees).

Q: Does your controller support remote diagnostics or OTA updates?

A: Yes. Through CAN 2.0 communication, the MCU supports remote connectivity. To enable OTA (Over-the-Air) updates and remote diagnostics, an optional IoT module is required, available upon project consultation.

Q: Do I need a thermal management system in high-temperature conditions?

A: No extra system is needed. The motor and controller use air cooling, suitable for most environments. Ensure proper ventilation around the components.

Q: What is the Ingress Protection (IP) rating for the motor, controller, and axle?

A: Our standard setup includes IP65 waterproof and dustproof rating. We can offer IP66 upgrades for applications in harsh or outdoor environments.

Q: Are compliance or quality test reports available?

A: Yes. Every order includes a factory inspection report. In addition, we provide motor and MCU type reports (TR) post-purchase for OEM verification or regulatory needs.

Q: Is the complete powertrain kit (motor, controller, axle) available?

A: Yes. We supply the full electric powertrain kit as standard. We also offer optional EV components including electronic steering systems, throttle modules, gear selectors, and more—tailored for low-speed electric vehicles (LSEVs) like golf carts, trikes, and utility EVs.