1. Introduction
Welcome to the Ttgo HZ-28ST Electric Bike user manual. This guide provides essential information for the safe assembly, operation, maintenance, and troubleshooting of your new electric bicycle. Please read this manual thoroughly before your first ride to ensure optimal performance and safety.
Figure 1.1: Ttgo HZ-28ST Electric Bike Overview
2. Safety Information
⚠️ Disclaimer: Please mind potential fire risk and strictly follow the instruction manual for charging and storage. While using the product, please wear protective equipment and fully comply with the applicable law and regulations.
- Always wear a helmet and appropriate safety gear when riding.
- Ensure all components are securely fastened before each ride.
- Familiarize yourself with local electric bike regulations and adhere to them.
- Do not operate the bike under the influence of alcohol or drugs.
- Be aware of your surroundings and ride defensively.
- Properly store and charge the battery as instructed to prevent fire hazards.
3. Product Overview
The Ttgo HZ-28ST is a versatile electric bike designed for adults, featuring a robust aluminum alloy frame and a powerful electric assist system. It is suitable for city commuting and light e-mountain biking.
Key Features:
- Motor: 250W Brushless Motor with 45 N.M torque.
- Battery: 36V 20Ah Lithium Battery for extended range.
- Frame: Durable 28"x480mm 6061 Aluminum Alloy Frame.
- Tires: Kenda 700C*45C tires for city and varied terrain.
- Brakes: 160mm Mechanical Disc Brakes for reliable stopping power.
- Gears: Shimano 7-Speed Chainwheel 40T with 5-class pedal assist and throttle.
- Display: Intuitive LCD Colorful Screen.
- Lighting: 1.5W LED Headlight and 0.3W Tail Light.
- Suspension: Shockproof Fork for a smoother ride.
- Max Range: Up to 110 km (depending on assist level and terrain).
- Max Speed: <25 km/h.
Figure 3.1: White Ttgo HZ-28ST Electric Bike
Figure 3.2: Black Ttgo HZ-28ST Electric Bike
Figure 3.3: Front Fork and Tire Detail
4. Specifications
Detailed specifications for the Ttgo HZ-28ST Electric Bike are provided below:
Figure 4.1: Ttgo HZ-28ST Electric Bike Specifications
| Feature | Specification |
|---|---|
| Model Number | HZ-28ST |
| Motor | 36V 250W, 45 N.M Brushless |
| Battery | 36V 20Ah Lithium Battery |
| Frame Material | 28"x480mm 6061 Aluminum Alloy |
| Wheel Size | 28 inches (Kenda 700C*45C) |
| Max Speed | <25 km/h |
| Range per Power | Max 110 km |
| Brakes | 160mm Mechanical Disc Brake |
| Gears | Shimano 7 Speed Chainwheel 40T, 5 Class Pedal Assisted and Throttle |
| Charger | 3A Charger |
| Headlight | 1.5W LED |
| Tail Light | 0.3W |
| Display | LCD Colorful Screen |
| Controller | Smart Controller Overheat Protection |
| Max Payload | 125 kgs |
| Suitable Rider Height | 165-195 cm |
| Rated Passenger Capacity | Two Seat |
| Folded | No |
| Certification | CE |
5. Setup
5.1 Unpacking and Initial Inspection
- Carefully remove all packaging materials.
- Inspect the bike for any visible damage that may have occurred during shipping.
- Verify that all components listed in the packing list are present.
5.2 Assembly
Your Ttgo HZ-28ST bike may require some assembly. Typically, this includes:
- Handlebar Installation: Attach the handlebar to the stem and tighten securely.
- Front Wheel Installation: Install the front wheel, ensuring the disc brake rotor is correctly aligned with the caliper.
- Pedal Installation: Attach the pedals, noting that the left and right pedals are specific (usually marked 'L' and 'R'). Thread them carefully to avoid cross-threading.
- Seat Post and Saddle: Insert the seat post into the frame and adjust the saddle height for comfortable riding.
- Fenders and Rack: Attach the front and rear fenders and the rear rack if not pre-installed.
Ensure all bolts and quick releases are tightened to the manufacturer's recommended torque specifications. If you are unsure about any assembly steps, please consult a professional bicycle mechanic.
5.3 Initial Battery Charge
- Before your first ride, fully charge the battery using the provided 3A charger.
- Connect the charger to the battery charging port, then plug it into a standard wall outlet.
- The charging indicator on the charger will show the charging status (e.g., red for charging, green for fully charged).
- Do not overcharge the battery. Disconnect the charger once charging is complete.
- Always charge the battery in a well-ventilated area, away from flammable materials.
6. Operating Instructions
6.1 Powering On/Off
- To power on the bike, press and hold the power button on the LCD display for a few seconds.
- To power off, press and hold the power button again.
6.2 LCD Display Functions
The colorful LCD display provides real-time information about your ride:
- Speed: Current riding speed.
- Battery Level: Remaining battery charge.
- Assist Level: Current pedal assist level (0-5).
- Distance: Trip distance or total odometer.
- Error Codes: Displays diagnostic information if an issue occurs.
6.3 Pedal Assist System (PAS) and Throttle
- Pedal Assist: The bike offers 5 levels of pedal assist. Use the '+' and '-' buttons on the control panel to adjust the assist level. Level 0 provides no motor assistance, while Level 5 provides maximum assistance.
- Throttle: The bike is equipped with a throttle for on-demand power. Twist the throttle grip to engage the motor without pedaling. Use the throttle responsibly and in accordance with local regulations.
6.4 Gear Shifting
- The Shimano 7-speed gear system allows you to adjust your pedaling effort to different terrains.
- Shift gears smoothly by pedaling lightly while operating the shifter. Avoid shifting under heavy load.
6.5 Braking
- The mechanical disc brakes provide strong and consistent stopping power.
- Apply both front and rear brakes simultaneously for effective and controlled stopping.
- Avoid sudden, hard braking, especially with the front brake, to prevent loss of control.
7. Maintenance
7.1 Regular Checks
- Tires: Check tire pressure before each ride. Kenda 700C*45C tires typically require 35-65 PSI. Inspect for wear and punctures.
- Brakes: Ensure brake levers are firm and responsive. Check brake pads for wear and replace if necessary.
- Chain: Keep the chain clean and lubricated for smooth shifting and to prevent rust.
- Bolts and Fasteners: Periodically check and tighten all bolts, nuts, and quick releases.
- Lights: Verify that the LED headlight and tail light are functioning correctly.
7.2 Battery Care
- Charge the battery regularly, even if not used frequently, to maintain its health.
- Avoid completely draining the battery.
- Store the battery in a cool, dry place, away from direct sunlight and extreme temperatures.
- If storing for an extended period, charge the battery to 50-70% and check it every few months.
7.3 Cleaning
- Clean the bike with a damp cloth and mild soap. Avoid using high-pressure washers directly on electrical components.
- Do not immerse the bike or its electrical components in water.
- Dry the bike thoroughly after cleaning.
8. Troubleshooting
This section addresses common issues you might encounter with your Ttgo HZ-28ST Electric Bike.
| Problem | Possible Cause | Solution |
|---|---|---|
| Bike does not power on | Battery not charged, battery not properly seated, loose electrical connection. | Charge battery, ensure battery is fully inserted, check main power cable connections. |
| Motor not assisting | PAS level set to 0, throttle not engaged, brake levers engaged, motor cable loose. | Increase PAS level, twist throttle, ensure brake levers are fully released, check motor cable connection. |
| Brakes feel spongy or weak | Worn brake pads, cable stretch, contamination on rotor/pads. | Inspect/replace brake pads, adjust brake cable tension, clean rotors/pads with disc brake cleaner. |
| Gears are not shifting smoothly | Dirty/dry chain, misaligned derailleur, stretched shift cable. | Clean and lubricate chain, adjust derailleur, replace shift cable if necessary. |
| Unusual noises during riding | Loose components, rubbing brakes, dry chain, motor issue. | Inspect all fasteners, check brake alignment, lubricate chain. If motor noise persists, contact support. |
9. User Tips
Based on general electric bike usage and common feedback, here are some tips to enhance your riding experience:
- Vary Assist Levels: Experiment with different pedal assist levels to find the balance between effort and battery range that suits your ride.
- Pre-Ride Check: Always perform a quick check of tire pressure, brakes, and battery level before heading out.
- Secure Parking: Always use a robust lock when parking your e-bike, especially in public areas.
- Weather Conditions: While the bike is designed for various conditions, avoid riding in heavy rain or through deep puddles to protect electrical components.
- Regular Cleaning: Keep your bike clean, especially after riding in muddy or dusty conditions, to prolong component life.
Note: No specific user tips were available from provided reviews or Q&A data. These are general recommendations.
10. Warranty and Support
Your Ttgo HZ-28ST Electric Bike comes with a manufacturer's warranty covering defects in materials and workmanship. Please refer to your purchase documentation for specific warranty terms and duration.
For technical support, spare parts, or warranty claims, please contact the seller or authorized service center. Keep your proof of purchase handy when contacting support.
