Hydraulic Jack Principle And Operation Pdf

hydraulic jack principle and operation pdf

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Published: 12.05.2021

Hydraulic jack

The manual contains important safety, installation, operation and maintenance instruction. Make this manual available to all responsible persons. Keep for further use! Caution can also indicate dangerous practices. Lifting capacity Q : indicates maximum mass of load working load limit the jack is designed to support in general service under conditions given by this manual. The mass of load must not exceed nominal lifting capacity. Since an accident or serious injury could result, special safety precaution apply to the operation with the hydraulic during its use, maintenance and inspection.!

ALWAYS make sure the ground is firm enough to support safely fully loaded jack and all lifting operation. Remember proper rigging and lifting techniques are the responsibility of the operator.

Check all applicable national directions, regulations and standards for further information about the safe use of your hydraulic jack. Only such interventions can be done when maintaining that are in compliance with requirements of the manufacturer specified in the chapter 11 of this manual.

It is not allowed to provide repairs and maintenance in a different way then specified by the manufacturer. It is especially prohibition of use of no original parts or providing changes of product without the agreement of manufacturer. Every hydraulic jack of standard version is equipped with hand lever The following accompanying documentation is a part of the delivery: a Operation Manual b EC Declaration of Conformity c Certificates of Quality and Completeness and Guarantee Card c1 Guarantee period is stated in the Guarantee Card.

Follow the valid technical regulation and standards and standards for work with heavy loads. The hydraulic jack is not portable by women and persons under 18 years of age. Loose bolt of the screw plug before starting work 5 - pic. With tighten bolt of the screw plug, the underpressure will arise in tank and the pump will not work. Installation must not be carried out on the surface we cannot check the loading capacity or is unstable.

Between body 1 and surface must be space x ; tank must not contact the ground - see pic Make sure the jack stand upright during lifting. Axes of piston 3 can be deviated from the vertical at max. By the pendulous movements of the lever joint 7 sucked the oil into the pump and its flush. Then tighten the screw of the drain valve 6 by the hand lever 7 , by its opening of diameter 6,3 mm put through rounds steel of needed length for making out bigger torsion moment.

Lifting provide by the pendulous movement of the hand lever operating piston of the puma. After finishing of lifting ensure piston by the nut against self drop 4 - see pic 6. Lowering the piston and speed of lowering control by releasing the screw of the drain valve 6 thanks to slide on hand lever. Before lowering the piston in dusty environment we recommend to clean up the surface of the piston.!

At the same time check the jack, whether during lowering and stop keep the load without a drop of piston. In this case release balls by flushing the pump, e. If the balls cannot be released in this way, it is necessary to repair the pump.! CAUTION It is necessary to fasten the screw in thread plug of the tank 5 and tight properly the drain valve 6 before the transportation of the pump.

By neglecting the above mention statement there is a risk of oil leakage with the result of pollution of the transport means and possible environment contamination. The jack is operated by the delivered hand lever. Can be used by organisation as well as private persons. WARNING 1 The operating staff of the hydraulic jack must be demonstrably familiarized with this operation manual, must observe applicable safety and hygienic regulations and must be qualified for operation of this equipment.

When it is not possible, one or more persons must help to supervise in the nearby area of the jack. It is prohibited to lift or lower bulky loads preventing to keep sufficient safety distance. All new or repaired hydraulic jacks shall be inspected by a responsible qualified person to ensure the qualified fulfillment of requirements of this operation manual. The intervals depend on the condition of the critical components of the hydraulic jacks and the degree of the wear and tear, deterioration or malfunction.

The two general classifications are herein classed as daily and regular ones. The respective intervals are defined as follows: a Daily inspection: visual inspection, carried by the operator, designated by the user. Provide this inspection also during operation in the interval between regular inspections. Qualified employees will determine whether any defect or damage can constitute a hazard and whether more detailed inspection is necessary Regular inspection Complete inspections of the hydraulic jack perform as recommended regular inspections.

These inspections may be performed with the hydraulic jack in its normal location. Recommended regular inspection specified in the section 8. These inspections shall include the requirements of the daily inspection as well Occasionally used hydraulic jack 1 Hydraulic jack, which has been idle for a period of one month or longer but less than one year, remit to the inspection conforming to the requirements of the section before follow-up putting it into operation.

Dated inspection records perform in time intervals specified in the section 2 b and such records store in an accessible place designated by the user. Function of the jack 2. Check of piston matrix visually by screw Lever moves with difficulty or jammed, etc..

Matrix cannot be screwed up 3. Piston visually Immediate drop of piston after finishing of lifting 3. Fastenings visually Wrong or missing parts 2. Oil check visually Lack of oil or its impurity 3. Label visually Lifting capacity is not legible 4.

Piston visually Oil leakage around the piston 5. All parts visually Worn or damaged parts 9. Drop of piston cased by the load does not occur. Leakage of pump inlet valve B or forcing valve A of pump or pump cup see obr. If the leakage appear henceforth, dismantle valves and clean up carefully. Stuck piston. Leakage of drain valve poz 1 obr. Tighten drain valve. If the fault lasts, dismantle. The move of the pressed in valve happened due to the neglected manipulation or non-observance of the instruction manual.

Necessary repair of the jack in production plant. Clean parts by the dissolvent and apply a new lubricant. ALWAYS lubricate more often in corrosive environment then in normal one salt water, sea climate, acids etc. It is not permitted to perform repairs and maintenance the other way then prescribed by the manufacturer. It concerns especially the forbiddance of using unoriginal parts or carrying out modifications on the product without any approval of the manufacturer. If the hydraulic jack was dismantled from any reason, proceed according to the following instructions: 1 Provide maintenance in a clean environment.

Pull the piston 2 out of cylinder 3 together with matrix of piston 4. Remove the retained ring 5 and piston cup 6. After exchange of cup 6 provide assembly in a opposite sequence. Pay attention so as no jam or scraping of the cup occur during putting piston into the cylinder.

Make sure the piston was completely clean. Release retaining screw on joint lever 7. Pull out pin of joint lever 8. Together with joint lever 7 pull out piston of the pump 9. By the help of socket wrench 55 unscrew matrix of the pump 10 , pull out the flange 11 and pump body All dismantled parts especially inlet valve B and forcing valve A v body of the pump 12 thoroughly clean with technical benzine.

Pay attention so as all parts during regressive assembly were cleaned CHECK Check all dismantled parts, whether they are suitable for further use. Check all parts, if they are not worn out or do not have scratches or cracks. Check, whether the thread parts does not have damaged thread. Small surface burns and scratches or other small surface defects remove and smooth by the fine abrasive stone or the abrasive cloth TEST The loading test shall be done at all repaired jacks by a qualified person or service workshop: Apply a load not exceeding nominal lifting capacity of the jack.

Lift piston about 10 mm and in this normal position should be left for min. Then piston is lowered into the origin position. After this test the correct function of pump, hydraulic cylinder and drain valve is checked. Lifting and lowering must be fluent without sticking and seizure. During load in resting position during specified 3 minutes must not occur to evident drop of piston and oil leakage around piston cup or other seal.

Deleted oil pass over to an authorised and professional firm dealing with petroleum waste category SR special risk or give it directly to garbage disposal plant having authorisation to combustion of such a waste. Thus treated jack give you can give to a firm dealing with liquidation of metal scrap.

When not observing this condition the manufacturer does not guarantee safety of this product. In such a case the manufacturer warranty does not apply to the product. BRANO a. Failure to follow the safety rules and other basic. Failure to follow the safety rules and other. Table of contents 1.

Scope of use General remarks


The manual contains important safety, installation, operation and maintenance instruction. Make this manual available to all responsible persons. Keep for further use! Caution can also indicate dangerous practices. Lifting capacity Q : indicates maximum mass of load working load limit the jack is designed to support in general service under conditions given by this manual.

The hydraulic jack is a device used for lifting heavy loads by the application of much smaller force. Consider a ram and plunger, operating in two cylinders of different diameters, which are interconnected at the bottom, through a chamber, which is filled with some liquid. Above Equation indicates that by applying a small force F on the plunger, a large force W may be developed by the ram. Yeah its good and it helped in in my physics project. I am in class VIII and it helped me very much. THanks a lot.

An Introduction to Hydraulic Jacks on Ships

In , the French philosopher and scientist Blaise Pascal published his Treatise on the Equilibrium of Liquids , in which he discussed principles of static fluids. A static fluid is a fluid that is not in motion. When a fluid is not flowing, we say that the fluid is in static equilibrium.

Hydraulic jacks lift loads using the force created by the pressure in the cylinder chamber. A hydraulic jack creates pressure by moving oil through two cylinders via a pump plunger. The pump plunger is drawn back, which opens the suction valve and draws oil into the pump chamber. As the plunger is pushed down, the oil is transported through an external discharge valve and into the cylinder chamber. The suction valve then closes, resulting in pressure being built up within the chamber; causing the piston in the chamber to rise and lift your heavy object.

Therefore, most of the important or big screws are t ightened hydraulically on ships such as cylinder head nuts, exhaust valve nuts, for crank pin bearing, cross head bearing, main bearing, tie bolts, etc. Your email address will not be published. Search for:. Leave a Reply Cancel reply Your email address will not be published.


Hydraulic Jack | Working, Application, Advantage, Disadvantage

In order to learn more about the process of designing a part, group 10 took apart a Big Red car Jack. The device is designed to use hydraulic fluid and one-way valves to raise a ram rod so as to lift 4-ton vehicles in order for the user to be able to change tires. The jack is operated using a removable handle, which is pumped up and down, raising the jack, which in turn lifts the car. After testing and dissection, we concluded that the jack was both easy to use and very compact.

Ed Edwards. Jacks are pieces of material handling equipment that uses force multiplication to lift or move heavy loads. The term jacks can refer to a variety of lifting devices that employ leverage and other methods of mechanical advantage to amplify an applied force to provide the ability to transport a load. Hydraulic jacks are distinguished by their use of an incompressible liquid, such as hydraulic fluid or jack oil, as the means by which force multiplication is achieved. The primary mechanism by which force is applied varies, depending on the specific type of jack, but is typically a screw thread or a hydraulic cylinder. Jacks may be categorized based on the type of mechanism used to generate the lifting force, typically mechanical power, hydraulic power, or pneumatic power.

Hydraulic jacks depend on this basic principle to lift heavy loads: they use pump plungers to move oil through two cylinders. The plunger is first drawn back, which opens the suction valve ball within and draws oil into the pump chamber. In a hydraulic jack, that pump is operated by a lever.

Pascal's principle

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The principle was first enunciated by the French scientist Blaise Pascal. Pressure is equal to the force divided by the area on which it acts. If the second piston has an area 10 times that of the first, the force on the second piston is 10 times greater, though the pressure is the same as that on the first piston. Pascal also discovered that the pressure at a point in a fluid at rest is the same in all directions; the pressure would be the same on all planes passing through a specific point.