1. Product Overview
The Bennett V351HPU1 Hydraulic Power Unit is a compact, 12-volt system designed to generate hydraulic pressure for the operation of trim tabs. It facilitates the lowering and raising of trim tabs through the precise control of fluid flow. The unit incorporates two solenoid valves that direct hydraulic fluid to the actuators, ensuring the trim tabs are securely held in their desired position. Its robust design is capable of managing even large trim tabs effectively.
A translucent Lexan cover protects the electrohydraulic components from environmental exposure, including occasional wash-downs, while allowing for convenient visual inspection of the fluid reservoir level.
2. Safety Information
- Always disconnect power before performing any installation, maintenance, or troubleshooting.
- Ensure all electrical connections are secure and properly insulated to prevent short circuits and corrosion.
- Use appropriate personal protective equipment (PPE) during installation and maintenance.
- Refer to local regulations and safety standards for marine electrical and hydraulic systems.
- This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Handle with care and wash hands after handling.
3. Product Components
The Bennett V351HPU1 Hydraulic Power Unit consists of the following primary components:
- Hydraulic Pump: Generates the necessary fluid pressure.
- Electric Motor: Powers the hydraulic pump (12 Volt).
- Solenoid Valves: Two valves control the direction of fluid flow to the trim tab actuators.
- Fluid Reservoir: Stores hydraulic fluid. Features a translucent design for easy level checks.
- Lexan Cover: Protects internal components from environmental elements.
Figure 1: Bennett V351HPU1 Hydraulic Power Unit. This image displays the Bennett V351HPU1 Hydraulic Power Unit. It features a compact design with a translucent Lexan cover, allowing for visual inspection of internal components and fluid levels. A label on the reservoir indicates the 'Fluid Level Fill Range' and provides instructions for filling, including placing tabs in full up position, removing the Lexan cover, removing the fill plug, and adding automatic transmission fluid (ATF).
4. Setup and Installation
Proper installation is crucial for the optimal performance and longevity of your hydraulic power unit. Consult a qualified marine technician if you are unsure about any steps.
4.1 Mounting Location
- Select a dry, protected location, away from direct exposure to harsh marine elements.
- Ensure adequate ventilation around the unit.
- Mount the unit securely to a stable surface using appropriate fasteners.
4.2 Electrical Connections
- Connect the power unit to a 12-volt DC power source.
- Ensure correct polarity: positive to positive, negative to negative.
- Install an appropriately sized fuse or circuit breaker in the positive power line to protect the circuit.
- Connect the control wires from your trim tab switch to the solenoid valves as per the wiring diagram provided with your trim tab system.
4.3 Hydraulic Connections
- Connect the hydraulic lines from the trim tab actuators to the appropriate ports on the power unit's solenoid valves.
- Ensure all connections are tight and free of leaks.
4.4 Filling the Fluid Reservoir
The unit requires Automatic Transmission Fluid (ATF). Follow these steps to fill the reservoir:
- Place the trim tabs in the full up position.
- Remove the Lexan cover from the power unit.
- Locate and remove the fill plug.
- Add any type of automatic transmission fluid (ATF) until the fluid level is within the indicated "Fluid Level Fill Range" on the reservoir.
- Replace the fill plug and Lexan cover securely.
5. Operating Instructions
The Bennett V351HPU1 Hydraulic Power Unit operates in conjunction with your trim tab control switch to adjust the position of your boat's trim tabs.
- Lowering Tabs: Activating the "down" control on your trim tab switch will energize the solenoid valves, directing fluid to extend the trim tab actuators, thereby lowering the tabs.
- Raising Tabs: Activating the "up" control on your trim tab switch will energize the solenoid valves, directing fluid to retract the trim tab actuators, thereby raising the tabs.
- The solenoid valves are designed to lock tightly, securing the trim tabs in their set position when the control switch is released.
6. Maintenance
Regular maintenance ensures the reliable operation and extends the lifespan of your hydraulic power unit.
- Fluid Level Check: Periodically inspect the fluid level through the translucent reservoir. Ensure it remains within the "Fluid Level Fill Range." Top up with ATF as needed, following the instructions in Section 4.4.
- Lexan Cover: Ensure the Lexan cover is always securely in place to protect the internal components from moisture and debris.
- Visual Inspection: Regularly check for any signs of leaks around hydraulic connections or damage to electrical wiring. Address any issues promptly.
- Cleaning: Keep the exterior of the unit clean. Avoid using harsh chemicals that could damage the Lexan cover or other components.
7. Troubleshooting
If your Bennett V351HPU1 Hydraulic Power Unit is not functioning as expected, consider the following common issues and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit does not operate. | No power supply; Blown fuse/tripped breaker; Loose electrical connection. | Check 12-volt power supply; Inspect and replace fuse or reset breaker; Verify all electrical connections are secure. |
| Trim tabs move slowly or not at all. | Low hydraulic fluid level; Air in the hydraulic system; Restricted hydraulic lines. | Check and fill fluid reservoir (Section 4.4); Cycle tabs fully up and down several times to bleed air; Inspect hydraulic lines for kinks or blockages. |
| Fluid leak detected. | Loose hydraulic fitting; Damaged hose or seal. | Tighten all hydraulic fittings; Inspect hoses and seals for damage and replace if necessary. |
| Tabs do not hold position. | Faulty solenoid valve; Internal leak in actuator. | Contact a qualified marine technician for diagnosis and repair. |
If troubleshooting steps do not resolve the issue, contact Bennett Marine customer support or a certified service technician.
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | V351HPU1 |
| Power Requirement | 12 Volt DC |
| Dimensions (L x W x H) | Approximately 14 x 14 x 5 inches |
| Item Weight | Approximately 5.94 pounds |
| Reservoir Material | Translucent Lexan |
| Valve Type | Two Solenoid Valves |
| Manufacturer Part Number | 3004.0116 |
| OEM Part Number | BENV351HPU |
9. Warranty and Support
For specific warranty information, please refer to the documentation included with your purchase or contact Bennett Marine directly. Warranty terms and conditions may vary.
For technical support, replacement parts, or further assistance, please visit the official Bennett Marine website or contact their customer service department. You can often find additional resources, FAQs, and contact information on their official website.
Bennett Marine Official Website: www.bennetttrimtabs.com
