Key Takeaways
A two-valve, two-motor control is commonly used on two-tank hoists rated up to 14,000 pounds, particularly for boats backed into the slip.
During lifting, both blower motors and Lift/Launch valves are used until bubbling stops, then the valves are moved to Dry Dock before the motors are switched off.
The separate valves allow airflow adjustments between the port and starboard tanks to help correct an imbalance during lifting or launching.
The high-performance two-valve, two-motor control unit is typically installed on hoists up to 14,000 pounds, with two tanks, that are set up for boats that are backed into the slip. It can also be used for a two-tank hoist that is modified to accommodate a sailboat. The high-performance blower motors can push the air to a deeper water depth than the standard blower motors.
To raise the boat, position the boat directly over the hoist using the guide ropes, switch on the blower motors by flipping the black switch to the power-on position, and simultaneously turn the two levers to the Lift/Launch position. Once the boat is fully raised and bubbles are exhausted from the tanks, turn the levers to the Dry Dock position and switch off the blower motors.
To launch the boat, simply turn the levers to the Lift/Launch position. Remember, do NOT switch on the blower motors when launching the boat.
*Normally, you will open and close both levers at the same time. However, with this control, you can manipulate the valve position to control the airflow to the port and starboard air tanks. In a back-in application the ability to control airflow, port and starboard is important. Because of the longer stabilizer arms and the increased travel, any imbalance in the boat is greatly exaggerated during the lift/launch process. By manipulating the airflow, you can counteract the imbalance if necessary. You can pause the lift/launch process at any time by turning the levers to the dry dock position and switching off the blower motors.
FAQs
Why might a boat rise unevenly on a two-tank hoist?
Uneven onboard weight, positioning, or airflow can cause one side to rise faster than the other. The separate valves allow the operator to adjust airflow between the port and starboard tanks when needed.
What should be done if the boat becomes noticeably unbalanced?
Pause the process by moving the valves to Dry Dock and switching off the blower motors. Recheck the boat’s position and load, and contact an authorized dealer if the cause is not clear.
Can this control system be used with every two-tank boat lift?
No. Compatibility depends on the lift model, tank configuration, capacity, blower motors, and installation setup. Confirm compatibility with the manufacturer or an authorized dealer before installing or modifying controls.
Why is proper boat positioning important before raising the lift?
A: Centering the boat helps distribute weight more evenly across the lift and tanks. Proper positioning can reduce tilting, uneven lifting, and unnecessary stress on lift components.
