How Do Hydraulic Car Lifts Work?

On the surface, a child’s toy water gun and the hydraulic car lift you have in
your service bay may not seem to have much in common. But, what if we told you
that they operate using the same basic principle: Transmitting force via an
incompressible fluid.

The working mechanics of the water gun seem simple enough. When you pull the
trigger, you are exerting force against all the water within the tube. And this
force is what sends the water shooting out the nozzle. But, something else
happens when you pull the trigger. The initial force used to pull the trigger is
multiplied in the process — which is why the water ends up shooting out of the
gun with a much higher force than you used to pull the trigger.
Your Hydraulic Car Lift Works Just Like That Toy Water Gun

Just like the water gun, the hydraulic car lift works because force applied at
one end is transmitted, via hydraulic fluid, to another point in the system. The
beauty of the system lies in the fact that the force is multiplied as the fluid
travels from the first endpoint to the other endpoint. This is why a small
amount of pressure can end up lifting a tremendous amount of weight.
Trading Force for Distance

Most hydraulic car lifts rely on a multiple piston system. The first piston is
used to apply the force and the last piston is used to lift the car. However,
the distance between that first piston and that last piston plays a major role
in the amount of weight the lift can handle. Just like a traditional mechanical
lever, the greater the distance between the two endpoints, the more weight it
can lift.

The cool thing about the hydraulic system it that adding (or decreasing) force
is often as simple as changing the size of the first piston in relation to the
last piston. For example, using a mechanical principle commonly referred to as
“Trading Force for Distance,” a narrow cylinder can be connected to a wider
cylinder via the hydraulic lines. When the oil is compressed into the wider
cylinder, the distance the force needs to travel is reduced, but it still gets
multiplied in the process.
Why Does an Air Bubble Cause Trouble In a Hydraulic Lift?

The oil, or (in the example of the toy gun) the water, used in a hydraulic
system is what is known as an incompressible fluid. That basically means the
fluid’s density remains consistent regardless of how much pressure is applied.

Air, on the other hand, compresses easily and does not distribute force evenly.
(Think about what happens when you squeeze a balloon) Because of this, when a
hydraulic system gets an air bubble in the line, the whole system will become
corrupted. Instead of the force being evenly distributed across the oil, the air
bubble winds up absorbing the majority of the force. The result is that the
second piston barely moves, and the car lift struggles to get off the ground.

Professional car lifts wholesale in reasonable price: http://chinapuli.com/Lift/

How to Mount Two Post Lifts

Post lifts are designed to lift vehicles, for under-vehicle repair. There are many types of lifts out there, but they all require similar specifications for their mounting applications. When mounting post-lifts of any kind, it is best to start with fresh concrete. If the concrete has cracks or is crumbling, it should be replaced before trying to mount any type of machinery to it. Automobiles are heavy, and faulty concrete could lead to poorly installed equipment.

Post lifts can be mounted in private garages for individual projects.

Instructions

1.Position the post-lifts upright, 109 ½-inches apart. They should be at least 6 inches away from a crack or a seam. Their arms should be facing each other, and their bases should be parallel.

2.Mark the bolting holes through the mounting brackets, and on the cement by tracing through the bolt holes with your pencil. Drill a 3/4-inch-diameter, and 5 ½-inch-deep hole in each of the markings. Keep the drill bit perpendicular to the cement.

3.Blow the dust out with your air-compressor, to clean out the holes.

4.Tap the anchor bolts gently into each of the holes with your hammer, and leave ¾-inch of the bolt at the top. Do not damage the threads. Place the washer over each bolt, and screw the nuts on, until they're finger tight. Tighten them down with your wrench, turning them no more than 3 full turns. Very hard concrete may only require 2 full turns. If the bolts pull out, they will need to be relocated.

Tag:2 post car lift, 2 post car lift for sale, 2 post car lift installation, Two post lift

2 post lift manufacturer: http://www.chinapuli.com/Two-Post-Lift/

LM2EF-35/LM2EF-40 Two Post Lift

Two post lifts - the best professional Two post liftsmanufacturers, Coats Two post lift suppliers in China.

Features:

STRONG

1,5mm "internatonal standard" column steel plates made in Shanghai;

2,8mm brace arm and 6mm internal sliding column, never deform;

3,Wearable, Anti-High temperature, high strength oiliness macromolecule nylon slide block;

4,Require no less than 150mm cement on the ground, at least C25

SAFETY

5,Double safe antiskid device, from column ladder safe to close protection by dynamic hydraulic pressure, single side electrical release, ensure double safe staying for vehicles;

6,ABS control box, 24V operation system, manual lock release for emergency lowering valve;

7,Imported PLC weak electricity control board, energy saving 4%, endurability 5 times higher;

8,Adopt electromagnet release, more safer and reliable;

9,Adopt twin arms winding oil pipe, oil pressure safety up to 5 times;

10,Equipped crash-proof pad to protect car door;

11,Optional revolving suppot leg and connected sleeve support leg;

12,Gum rubber support leg pad, the endurability 3 times higher than the common materials;

13,Equipped dust cover, enhance the lift time of steel rope and chain;

14,Endure max 5T destructive testing, fulfill 3.5T/4T actual working conditions;

15,Chain style pulling device

 QUALITY

16,Total mold tooling technology, to ensure the conformity of both many  a holes and welding places;

17,Digital control raw materials processing center ensure the consistency;Optional revolving support leg and connected sleeve support leg;Gum rubber support leg pad, the enfurability 3 times higher than the common materials

POWER

18,Double cylinder dynamic hoist drive device, capacity is more than 4 ton;Aluminum pump system;

19,Mechanical lowering control hydraulic pressure configuration, simple, endurable and reliable

http://www.apoautomotive.com/LM2EF-35LM2EF-40-Two-Post-Lift-156.html

LM2EC-40 Two Post Lift

Two post lifts - the best professional Two post lifts manufacturers, Coats Two post lift suppliers in China.

Features:

STRONG
1,5mm "internatonal standard" column steel plates made in Shanghai;
2,8mm brace arm and 6mm internal sliding column, never deform;
3,Wearable, Anti-High temperature, high strength oiliness macromolecule nylon slide block;
4,Require no less than 150mm cement on the ground, at least C25

SAFETY
5，Double safe antiskid device, from column ladder safe to close protection by dynamic hydraulic pressure, single side electrical release, ensure double safe staying for vehicles;
6，Imported PLC weak electricity control board, energy saving 4%, endurability 5 times higher;
7，Adopt electromagnet release, more safer and reliable;
8，Adopt twin arms winding oil pipe, oil pressure safety up to 5 times;
9，Equipped crash-proof pad to protect car door;,
10，ABS control box, 24V operation system, manual lock release for emergency lowering valve;Gum rubber support leg pad, the endurability 3 times higher than the common materials;
11，Endure max 6T destructive testing, fulfill 4T actual working conditions;
12，No-chain and single point release device.

QUALITY
13，Total mold tooling technology, to ensure the conformity of both many a holes and welding places；
14, Digital control raw materials processing center ensure the consistency;
15, Optional revolving support leg and connected sleeve support leg;
16, Gum rubber support leg pad, the enfurability 3 times higher than the common materials;
17，Equipped dust cover, enhance the life time of steel rope and chain.

POWER
18,Double cylinder dynamic hoist drive device, capacity is more than 4T.
19,Aluminum pump system

http://www.apoautomotive.com/LM2EC-40-Two-Post-Lift-161.html

Двухстоечный подъемник PL-4.0-2B

Двухстоечный подъемник PL-4.0-2B

.Ручная разблокировка с двух сторон, двойное страхующее
самоблокирующееся устройство , безопасно и просто для эксплуатации.
. Два стальных троса, синхронно приводящие в движение скользящие блоки,
помогающие эффективно предотвращать опрокидывание автомобиля
. Минимальная высота подъемной платформы составляет 110 мм,
способствует легкому подъему, и подходит для низкопрофильных
автомобилей SUV.
. Оснащен алюминиевым защитным устройством  открывания двигателя и
дверей в качестве стандартной комплектации.
. Надежный гидроцилиндр, имеющий хромированный отточенный цилиндр
и шток поршня, с итальянскими уплотнениями гидроцилиндра,
обеспечивющие длительный срок службы
. Прошел 115% динамические испытания и 150% статические испытания

http://chinapuli.ru/Two-Post-Lift/two-post-lift-PL-4.0-2B.html

How to Safely Lift a Car on a 2-Post Lift

Floor jacks and jack stands are more readily available than two-post lifts, but do not offer the height and ease-of-use of two-post lifts. Two-post lifts are installed in garages that have a suitable ceiling height and can raise vehicles to a level that allows the mechanics to sit or stand up, giving greater access to the vehicle's underside and mechanical parts.
1 Drive the vehicle in between the two posts of the lift so that it is centered in between the two posts.
2 Swing the support arms that are connected to the two-post lift and align them with the vehicle's subframe, which will support the car when it is raised into the air.
3 Visually spot-check the placement of the supporting arms after initially positioning them to ensure that there are no mechanical obstructions that may cause the vehicle to slip once it begins its ascent into the air.
4 Engage the lift function of your two-post lift and slowly raise the car into the air. The support arms may have to travel a few inches by themselves before catching the subframe of the car.
5 Maintain visual contact with the supporting arms as the car is raised to ensure your safety, as well as the safety of the vehicle, until the car is fully raised into the air.

PL-4.0-2B Two Post Lift

PL-4.0-2B Two Post Lift

. Manual release from two sides，double insurance self-locking protection device,
safe and easy to operate.
. Equalization of two steel cables force both sliding blocks to move synchronously,
effectively prevent the vehicle from tilting
. Minimum height of the lifting pad is 110 mm, easily lift and suitable for low profile
cars and SUV.
. Equip aluminum motor and car door-opening protection as standard configuration.
. Reliable oil cylinder, adopts chrome-plating honed cylinder and piston rod, with
Italian seals on hydraulic rams, ensure long service life
. Passed 115% dynamic test and 150% static test

http://www.chinapuli.com/Two-Post-Lift/PL-4.0-2B-Two-Post-Lift.html

PL-3.5-2C Two Post Lift

PL-3.5-2C Two Post Lift

car lifts 2 post, car lifts for garages, car lifts for sale, car lifts garage, 2 post car lift

. Manual release from two sides，double insurance self-locking protection device,
safe and easy to operate.
. Elegant appearance with hidden cable and pipeline.
. Equalization of two steel cables force both sliding blocks to move synchronously,
effectively prevent the vehicle from tilting
. Minimum height of the lifting pad is 110 mm, easily lift and suitable for low profile
cars and SUV.
. Equip aluminum motor and car door-opening protection as standard
configuration.
. Reliable oil cylinder, adopts chrome-plating honed cylinder and piston rod, with
Italian seals on hydraulic rams ,ensure long service life
. Passed 115% dynamic test and 150% static test

http://www.chinapuli.com/Two-Post-Lift/PL-3.5-2C-Two-Post-Lift.html

PL-3.5-2H Two Post Lift

PL-3.5-2H Two Post Lift

car lifts 2 post, car lifts for garages, car lifts for sale, car lifts garage, 2 post car lift

. Electrical release, easy to operate just by pressing UP and DOWN and LOCK
button. Low voltage control system matches CE standard.
. Adopt electromagnetic release, more safe and reliable.
. Equip chain protection cover to enhance the lifetime of steel steel rope and chain
. Feet protection fender protect the personal safety.
. Equalization of two steel cables force both sliding blocks to move synchronously,
effectively prevent the vehicle from tilting.
. Minimum height of the lifting pad is 110 mm, easily lift and suitable for low profile
cars and SUV.
. Equip aluminum motor and car door-opening protection as standard configuration.
. Reliable oil cylinder, adopts chrome-plating honed cylinder and piston rod, with
Italian seals on hydraulic rams ,ensure long service life.
. Passed 115% dynamic test and 150% static test .

http://www.chinapuli.com/Two-Post-Lift/PL-3.5-2H-Two-Post-Lift.html