1. Introducció
This manual provides essential information for the proper installation, operation, and maintenance of your Bennett V351HPU1 Hydraulic Power Unit. This unit is designed to generate hydraulic pressure for marine trim tab systems, enabling precise control over vessel trim. Please read this manual thoroughly before installation and use to ensure safe and efficient operation.
2. Informació de seguretat
Observeu sempre les precaucions de seguretat següents:
- Desconnecteu tota l'alimentació de la unitat abans de realitzar qualsevol instal·lació, manteniment o resolució de problemes.
- Ensure proper ventilation when working with hydraulic fluids.
- Utilitzeu equips de protecció personal adequats, incloent protecció ocular i guants.
- Verify all electrical connections are secure and correctly insulated to prevent short circuits or electrical hazards.
- Use only recommended hydraulic fluid (automatic transmission fluid, ATF) as specified in the maintenance section.
3. Components mésview
The Bennett V351HPU1 Hydraulic Power Unit consists of the following primary components:
- Motor elèctric: Powers the hydraulic pump.
- Bomba hidràulica: Generates fluid pressure.
- Vàlvules solenoides: Two valves control the direction of fluid flow to the trim tab actuators.
- Dipòsit: Holds the hydraulic fluid. Features a translucent design for easy fluid level checks.
- Lexan Cover: Protects internal components from environmental elements and occasional washdown.

Figura 1: Bennett V351HPU1 Hydraulic Power Unit. This image displays the Bennett V351HPU1 Hydraulic Power Unit. It features a translucent Lexan cover, allowing visual inspection of internal components and fluid levels. The lower section is a white reservoir with a 'Fluid Level Fill Range' indicator. The unit's compact design is evident, with the motor and solenoid valves visible under the cover.
4. Configuració i instal·lació
Proper installation is crucial for the performance and longevity of the hydraulic power unit. Follow these steps carefully:
4.1 Ubicació de muntatge
- Mount the unit in a dry, protected area, away from direct exposure to saltwater spray or excessive heat.
- Ensure the unit is mounted vertically with the reservoir at the bottom to maintain proper fluid levels and prevent airlocks.
- Allow sufficient space around the unit for maintenance access, especially for checking fluid levels and electrical connections.
4.2 Connexions elèctriques
- The unit operates on a 12-volt DC power supply.
- Connect the positive (+) wire from the vessel's 12V power source to the designated positive terminal on the unit.
- Connect the negative (-) wire to a reliable ground point on the vessel.
- Ensure all wiring is of appropriate gauge for the current draw and protected by a fuse or circuit breaker as recommended by marine electrical standards.
- Connect the control wires from your trim tab switch to the corresponding solenoid terminals on the power unit. Refer to your trim tab switch wiring diagram for specific connections.
4.3 Connexions hidràuliques
- Connect the hydraulic lines from the trim tab actuators to the appropriate ports on the power unit. Typically, one line connects to the 'Up' port and the other to the 'Down' port for each tab.
- Ensure all hydraulic fittings are tightened securely to prevent leaks. Do not overtighten.
4.4 Initial Fluid Fill and Bleeding
- Before operating, fill the reservoir with automatic transmission fluid (ATF). The fluid level should be within the 'Fluid Level Fill Range' indicated on the reservoir.
- To bleed the system, cycle the trim tabs fully up and down several times. This will help remove any trapped air from the hydraulic lines and actuators.
- Monitor the fluid level during bleeding and top off as necessary.
Vídeo 1: 12V Marine Hydraulic Power Unit Replacement. This video demonstrates the replacement process for a 12V marine hydraulic power unit, similar to the Bennett V351HPU1. It provides visual guidance on installation and connection procedures, which can be helpful during setup.
5. Instruccions de funcionament
Once installed and filled, the Bennett V351HPU1 Hydraulic Power Unit operates in conjunction with your vessel's trim tab control switch.
- Use the trim tab switch to extend or retract the trim tabs.
- Pressing the 'Bow Down' or 'Down' button will extend the tabs, pushing the bow of the vessel down.
- Pressing the 'Bow Up' or 'Up' button will retract the tabs, allowing the bow of the vessel to rise.
- Adjust the tabs incrementally to achieve the desired vessel trim and optimize performance and fuel efficiency.
6. Manteniment
Regular maintenance ensures the longevity and reliable operation of your hydraulic power unit.
6.1 Fluid Level Check
- Periodically check the fluid level in the translucent reservoir. The fluid level should be visible within the 'Fluid Level Fill Range' when the trim tabs are fully retracted (up position).
- If the fluid level is low, add automatic transmission fluid (ATF). Do not overfill.
6.2 Reservoir Cleaning
- If the fluid appears discolored or contaminated, the reservoir may need to be drained and refilled.
- To drain, disconnect the hydraulic lines and carefully invert the unit, or use a pump to extract the fluid.
- Clean the reservoir interior with a lint-free cloth if necessary, then refill with fresh ATF.
6.3 Inspecció general
- Inspect all electrical connections for corrosion or looseness. Clean and tighten as needed.
- Check hydraulic lines and fittings for any signs of leaks or damage. Replace damaged components immediately.
- Ensure the Lexan cover is securely in place to protect the internal components.
7. Solució De Problemes
This section addresses common issues you might encounter with your hydraulic power unit.
| Problema | Causa possible | Solució |
|---|---|---|
| La unitat no funciona | No power; Blown fuse/tripped breaker; Faulty wiring; Defective switch | Check power supply; Replace fuse/reset breaker; Inspect and repair wiring; Test and replace switch if necessary |
| Tabs move slowly or not fully | Low fluid level; Air in system; Restricted hydraulic lines; Weak motor | Check and refill fluid; Bleed the system; Inspect lines for kinks/blockages; Consult a technician for motor issues |
| Fuites de fluids | Loose fittings; Damaged hydraulic lines; Cracked reservoir | Tighten fittings; Replace damaged lines; Replace reservoir if cracked |
| Tabs drift down | Faulty solenoid valve; Internal leak in actuator | Consult a technician for solenoid or actuator repair/replacement |
8. Especificacions
| Característica | Especificació |
|---|---|
| Número de model | V351HPU1 |
| Voltage | 12 volts CC |
| Dimensions (L x A x A) | Aproximadament 14 x 14 x 5 polzades |
| Pes de l'article | Aproximadament 5.94 lliures |
| Reservoir Material | Translucent Lexan |
| Tipus de fluid | Fluid de transmissió automàtica (ATF) |
| Número de peça del fabricant | 3004.0116 |
| Número de peça OEM | BENV351HPU |
9. Garantia i Suport
For warranty information or technical support, please refer to the official Bennett Marine weblloc web o poseu-vos en contacte amb el seu departament d'atenció al client. Conserveu el rebut de compra com a comprovant de compra per a qualsevol reclamació de garantia.
Weblloc: www.bennetttrimtabs.com
Contacte: Consulteu el weblloc web per obtenir informació de contacte actualitzada.