The most prevalent type of surface-mounted lift is the two-post, drive-through, frame-engaging model. Each lifting carriage supports two swing arms, and these carriages are synchronized to operate levelly and in unison, using steel cables, chains, synchronized motors, or hydraulic circuits for equalization. In the United States, the steel cable is the most commonly used synchronization method.
The synchronizing cables are either routed through an overhead beam or under a floor plate cover, depending on the lift design. Overhead beam designs necessitate a minimum ceiling height of 12 feet, while floor plate designs can function under lower ceiling heights, often fitting under 10 feet. The cables do not bear the lift load; rather, they ensure that hydraulic cylinders operate evenly.
The hydraulic system consists of an electric power unit, hydraulic hoses, and two cylinders—one located in each lift column. The power unit contains an electric motor, a pump, and a reservoir tank, all housed within a single unit.
Using a two-post lift correctly can significantly enhance efficiency and safety in an automotive shop. By understanding the various types of lifts, their installation requirements, and safety considerations, technicians can ensure that they are utilizing this essential equipment to its fullest potential. Regular maintenance, proper usage, and adherence to safety guidelines will ultimately lead to a more productive and secure working environment.
Electric / Hydraulic Power Unit Overview
An electric/hydraulic power unit is an essential component for operating vehicle lifts in automotive shops. This unit is powered by an electric motor that requires a 220-volt electrical supply and operates on a 30-amp circuit. To comply with local codes and ensure safe and efficient installation, most automotive shops opt to run power lines down from the ceiling to connect to the motor switch box.
Pump and Reservoir Configuration
The hydraulic pump is situated strategically between the electric motor and the hydraulic reservoir tank. This setup is designed to maximize efficiency and ensure effective operation. The pump comes equipped with valves that have predetermined pressure limits. These limits are in place to prevent the lift from exceeding its rated capacity. It is crucial to adhere strictly to these factory settings; any attempt to adjust the pressure valve can lead to unsafe operating conditions and potential accidents.
When the operator presses the “up” button, the hydraulic fluid within the system is pressurized and directed through hoses to the hydraulic cylinders. This action generates the lift needed for the carriages and arms of the lift to elevate the vehicle. Conversely, when the operator engages the “down” lever, the lowering valve is activated. This valve allows the pressurized fluid to return to the reservoir tank, effectively lowering the lift in a controlled manner.
Hose and Cable Routing
The car lift for sale Des Moines hydraulic hoses and electrical cables are routed to each lift post in one of two ways, depending on the lift design. In overhead style lifts, the hoses and cables are typically routed via an overhead beam. On floor plate style lifts, the routing occurs beneath the floor cover. This routing is essential for maintaining a clean workspace and ensuring that the lift operates efficiently and safely.
Vehicle Lift Safety Protocols
Before operating a vehicle lift, it is mandatory for all personnel to undergo proper training. Familiarization with the lift’s features and safety protocols is essential before attempting to lift a vehicle. While automotive lifts have a commendable safety record, improper loading can lead to hazardous situations. Incidents where vehicles fall unexpectedly often result from negligence, improper usage, or lack of maintenance.
To promote safety, the American National Standards Institute (ANSI) and the Automotive Lift Institute (ALI) have established the American National Standard (ANSI/ALI ALCTV – 2011). This comprehensive standard outlines safety requirements for the operation, inspection, and maintenance of automotive lifts. Among its stipulations is the necessity for an annual inspection by a qualified lift inspector. ALI is actively working on a new certification program for lift inspectors to ensure compliance and enhance safety measures. The annual inspection serves to maintain the lifts in optimal operating condition, preventing accidents and ensuring user safety.
Understanding the Center of Gravity
One of the critical aspects of safely operating a vehicle lift is determining the vehicle’s center of gravity. The center of gravity is the point where the weight of the vehicle is distributed evenly between the front and rear wheels. Proper placement of the vehicle over the lift posts is essential for safe operation. The positioning may vary based on whether the vehicle is front-wheel drive or rear-wheel drive.
According to car lift for sale Des Moines, the center of gravity for rear-wheel-drive vehicles is typically located just below the driver’s seat. For front-wheel-drive vehicles, the center of gravity tends to be slightly ahead of the driver’s seat, directly beneath the steering wheel.
car lift for sale Des Moines Safety Considerations for Lifting Vehicles
It is imperative to recognize the weight of the vehicles being lifted, which can often exceed several thousand pounds. Accurate placement of the vehicle is crucial to ensure that the center of gravity is correctly aligned over the car lift for sale Des Moines lift posts. When utilizing a two-post lift, avoid positioning the vehicle too far forward or backward solely to facilitate easier access to the doors. Instead, consult the guidelines on asymmetric lift loading to determine the correct offset required for door clearance.
Operating a car lift for sale Des Moines Two-Post Car Lift Safely
If any issues arise with the lift, it is critical not to use the equipment. Instead, immediately report the problem to your supervisor. Safety must always be the top priority.
When beginning the lifting process, start by raising the vehicle until its wheels are approximately six inches off the ground. This initial lift allows for a thorough inspection of the lift’s contact points. It is crucial to “jounce” the vehicle gently at this height to double-check the contact between the lift adapters and the vehicle’s frame, ensuring that the vehicle is securely engaged with the lift.
Ensure that all four car lift for sale Des Moines lift pads are making contact with the vehicle’s lift points and bearing weight evenly. It is not uncommon for three lift arms to contact the vehicle while one remains free to move. If any lift arm is mobile after lifting the vehicle, it indicates an uneven load distribution. In such cases, lower the vehicle and adjust the positioning of the arm before lifting again.
If you find that a car lift for sale Des Moines llift arm is improperly positioned, lower the vehicle back to the ground slowly to allow for correct repositioning of the arm.