Worm Gear Screw Jack Operation Manual, Worm Gear Screw Jack Installation Instructions, Worm Gear Screw Jack Trouble Shooting, Worm Gear Screw Jack Lubricant, Worm Gear Screw Jack Assembly

7/30/2019 Worm Gear Screw Jack Operation Manual, Worm Gear Screw Jack Installation Instructions, Worm Gear Screw Jack

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JACTON SCREW JACKS

Screw Jack Operation Manual

Caution: Read this manual before installation or operation of JACTON screw jack. Failure to

understand this manual, installation or operation screw jack properly could result in damageto the jack and or serious personal injury.

Do not exceed the jack ratings including design load capacity, travel length, and input speed.

Install, align and shield all moving parts properly. Proper machinery installation practices

should be followed. Safety codes for mechanical power transmissions apparatus are to be

followed. Check for and adhere to all applicable safety codes. Bolts should be sized to fit the

jack mounting holes, at least grade 5 and tightened to the appropriate torque. Mounting bases

should be flat and sufficiently strong to support the load. Properly lubricate and maintain the

JACTON product. Use the jack only for the intended application. Failure to install, use, or

maintain JACTON products could result in product failure and personal injury.

This operation manual is applicable to all jacks models. Note: Information represents typical

configuration and may difference slightly from the actual jack being installed or repaired. The

maintenance instruction provides recommendations of safe and efficient approach to

installation or service repair problems.

When an operating situation occurs, refer to the troubleshooting guide to isolate cause. When

applicable, guides are listed by symptom followed with suggestions of probable causes.

Once the source of the problem is identified, consult JACTON engineers for disassembly and

re-assembly procedures guides for recommended repair procedures.

General Instruction and Specifications

Your screw jack was manufactured to high quality standards and is designed to provide many

hours of service. But certain safety measures and procedures must be followed in handling,

installing and servicing the jack to insure long trouble free service.

1. Any obvious or suspected damage to jack during transport from the factory must be

immediately reported to JACTONcompany and the carrier.

2. Upon delivery all of the jack should be inventoried to determine if shortages exist. All

shortages must be immediately reported to JACTON company and the carrier.

3. The installation jack supplied by JACTON company does not include the services of a field

engineer.

4. The warranty applies only if the jack is operated within the rated capacity and conditions for

which the jack was specifically designed. The application design engineer must prevent any

destructive conditions for the jacks. Conditions that may be considered destructive are:

excessive input speeds, extreme shock loading, mechanical or thermal overloading,

exceeding recommended duty cycles, and side loading of the load screw.

5. Installation, maintenance and safety instructions must be given to personnel directly

Jacton Electromechanical Co.,Ltd | Tel: +86 (0)769 81585852 | Fax: +86 (0)769 81620195

Email:[email protected] | Web: www.screw-jack.com | Skype:jactonjack
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JACTON SCREW JACKS

responsible for the installation, maintenance and operation of the jack.

6. In the event that a malfunction of the jack occurs within the warranty

period JACTON company must be informed immediately and the jack must be immediately

removed from service.

Caution: screw jack is normally self-locking feature. Vibration could cause the screw jack to

self lower or creep. In the absence of internal or external stops the load screw can be moved

out of the jack base. Your jack base is not equipped with internal stop nuts unless special

requirements in your order. Jacks are not meant for personnel support. All applications

designed for personnel support must be approved by JACTON company engineers.

The worm gear driven screw jack incorporates a high frequency heat treatment high hardness

40Cr or C45 steel worm which drives a high tensile Phosphor bronze 10-1 or Tin bronze 10-1

worm gear, accurately machined to the high standards of JACTON Company for maximum

load carrying capacity and uniformity of motion transmission. All shafts are mounted on heavy

duty tapered roller bearings to increase operating efficiency of the drive mechanism. Heavy

duty tapered roller bearings are provided to support the rated thrust load of each jack.

Housings are made of aluminium, cast iron or ductile cast iron are designed to handle the

rated thrust load and torque loads of each jack size.

A protective pipe is furnished which is threaded into the jack in order to keep the load screw

threads dust-proof and lubricated. The load screw is made of high quality 40Cr or C45

steel that is ground to size and precision rolled to form the threads. They are well

proportioned to handle the maximum lifting force of the jack. Stainless steel or specialcustomized alloy load screws can be provided at an additional cost. The threads of the load

screw should be well lubricated and kept free of grit and dirt. Bellows boots can be provided

as an accessory to protect the exposed portion of the load screw. In the event of over travel

the boots may be crushed. Standard jacks may be operated at a wide range of input speeds.

All jacks are recommended based on customer supplied duty cycle requirements.

Installation Instructions

1. Be certain that the rating of the jack exceeds the maximum load that may be imposed upon

it.

2. Check that rated input speeds of the jack will not be exceeded. Verify in the jack catalog

technical datas pages.

3. The foundation for the jack must be rigid enough to maintain correct alignment with

connected machinery and have ample strength to carry the maximum load.

4. The foundation should have a flat mounting surface to uniformly support the jack. The

opening for the load screw cover (or load screw) that passes through jack base must be as

small as possible to provide jack support over the largest possible area.

5. Check that the method of stopping the screw rotation so translation will occur is sufficiently

strong.

6. It is extremely important that the jack be installed so that the load screw is exactly plumb




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JACTON SCREW JACKS

and that all line shafting is aligned with the worm shaft.

7. After precise alignment, each member must be securely bolted and if possible, doweled in

place. Doweling will assure exact repositioning if ever removed. It is essential that a jack.

8. After the jack, miter gearbox, couplings are installed and aligned, there should be no signs

of binding or misalignment.9. Shaft coupling guards are the responsibility of the customer and are not provided by

JACTON, unless specifical requirements in your order.

10. Cautions must be taken when operating your jack at either extreme of travel. If possible,

hard external stops should be provided.

11. If operating at the upper limits of the jack rating, don't stop the downward travel of the jack

by running the load screw attachments or the load against the housing without checking with

JACTON, as serious damage to the internal mechanism may result.

12. The customer is responsible for providing mechanical stops and limit switches for control

of the prime travel length. None are included unless specifical requirements in your order.

Important: take up evenly on mounting bolts to avoid damaging the housing.

Cautions:

If limit switches are furnished by JACTON, they are not factory set. Limit switches should be

set by carefully moving the set position by hand or jogging the motor. Care should be

exercised when operating the jack at the extreme limits of travel.

The foundation of the jack is critical to insure alignment. Mount the jack and check that the

axis of the load screw is parallel to the movement of the load and centered with respect to the

load. Shim under the base to achieve this if needed. Both eccentric loading and/or sideloading will cause premature wear and possible bending and failure of the jack. Once the

alignment is correct hand tighten the mounting bolts.

Next align the input shafts with the worm shaft of the jack. This alignment can be just as

critical to proper operation. Test the alignment by rotating the shafts by hand, and fully extend

the load screws. If the hand operation turns freely and the other components of the system

are in alignment, tighten the mounting fasteners and attach the load to the jack. Start-up

should be and break-in periods of several minutes with careful observation are required. Any

vibrations, binding or excessive amperage draw of motors is reason to shut down and repeat

the entire alignment procedure.

Finally the load screw should be re-greased with a light film, and the jack housing be checked

that it is full of grease.

Trouble Shooting

Your jacks will perform satisfactorily if the suggestions described in the booklet are carefully

followed. It is estimated the approximately 98 percent of screw jack failures can be attributed

to improper lubrication, misapplication, and misalignment.




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JACTON SCREW JACKS




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JACTON SCREW JACKS

Lubricant

The lubricant should not be corrosive to gears, ball or roller bearings and must be neutral in

reaction. The lubricant must not contain any contamination that may be detrimental to

operation of the jack. The lubricant must have resistance to oxidation and must be non-channeling. Operating temperatures must be considered when selecting a lubricant for a jack.

We recommended the following extreme pressure greases or their equivalents. For

applications outside these limits contact the JACTON engineers.

The jack working temperature -20 deg. C to +80 deg. C, NLGI #2 grease, super high/low

temperature, need special grease, please contact JACTON engineers.

JACTON jacks are shipped with grease. Lubricant inspection is recommended at regular

intervals. Intervals are determined by the duty cycles of the jacks but should be performed a

minimum of once every two months.

Each jack is furnished with a grease fitting. The jack should be filled with grease until lubricant

begins to seep from the load screw opening. For jacks with boots, remove the boot at the jack

before you check for proper grease levels. Severe operating conditions may require more

frequent lubrication.

Load screws must be checked regularly to insure that they are adequately lubricated. This is

especially critical for the rotating design units where no lubrication is deposited because the

load screw does not translate through the housing into the protective pipe.

Assembly Inspection

Caution: Never perform any work on the jack or associated transmission equipment until the

prime travel length cannot be remotely or automatically started. Make sure the load is

properly supported before the Jack, brake, or other holding devices are removed. Be sure the

area around the Jack is relatively clean to prevent the parts from becoming contaminated,

and the machined parts are stored on wooden blocks to prevent damage to the machined

surfaces.

1. If possible remove the jack from the structure and inspect the jack on a work bench. If not

use cribbing to support the load.

2. Clean the jack of grease, dirt, and foreign material

3. Visually inspect the jack for damage such as cracked, broken or chipped parts, and married

surfaces.

4. Using a soft cloth or tape to protect the input shaft, with a pair of pliers or by hand, attempt

to turn the input shaft. If it won't turn without extreme effort, total disassembly will be required.

Consulting JACTON engineers for the disassembly procedure.

5. Measure the rotary backlash: Rig a positive stop and extend the load screw against the

stop. Mark the position of the input shaft. Reverse the rotation of the input shaft until you feel




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JACTON SCREW JACKS

the beginning of the load screw movement. Again mark the position of the input shaft.

Measure the angle of this rotation. If the measurement exceeds the 60 degrees then the

worm shaft and the worm gear must be replaced.

6. Measure the axial backlash: Extend the load screw against the positive stop. Mark and

remove the positive stop. Protect the load screw with a soft cloth or tape, clamp a handle tothe load screw and pull the load screw in the direction of the removed stop. Measure the

movement to determine the axial movement. If the movement is greater then the allowable

limits from the table below the worm gear and the load screw should be replaced.



Documents

Worm Gear Screw Jack Operation Manual, Worm Gear Screw Jack Installation Instructions, Worm Gear Screw Jack Trouble Shooting, Worm Gear Screw Jack Lubricant, Worm Gear Screw Jack Assembly