Neometrix / Hydraulic Jacking Systems / Hydraulic Jacking System / NMX-HJS-50

NMX-HJS-50 · ENGINEERED-TO-ORDER CLASS — SELECT · SET · LIFT · LOCK · WORK · LOWER

Hydraulic Jacking System. Oil lifts. Steel holds.

Name: Hydraulic Jacking System
SKU: NMX-HJS-50

A hydraulic jack lifts with oil, and oil is not a safe thing to leave a heavy load resting on. A lock nut, or a stack of steel packing, is.

So the system has two jobs. It lifts the load in small, level steps, and it hands the load from the oil to steel before anyone works under or near it.

Discuss a jacking system Capability note (PDF)

A single heavy-duty hydraulic cylinder jack standing on a grey steel base plate: a grey barrel with a hexagonal lock nut on a threaded collar, a bright plunger rod with a flat saddle, and a black hose and a plain grey hand pump set lying beside it, and no people

Fig · 01 — A heavy-duty cylinder jack with its lock nut, and a hose and a hand pump set laid beside it — illustrative render.

The lift

by oil, in small stepshand, electric or air

The hold

by steel, not by oillock nut or packing

The control

level, jack by jackby hand, divider or sensor

The record

one record per liftpressure and height

Status

engineered to orderno system yet delivered

ISO 9001ISO 14001ASME B30.1 jack safety referenceISO 4413 hydraulic safety reference

Overview

Why a jacking system is judged by what holds the load.

Because lifting is the easy half. The harm in a lift comes when a load is left resting on oil, or when it rises out of level.

Fig · 02 — The system in one picture: oil lifts the plunger, a steel nut takes the load, and the oil is released.

Oil lifts the load. Steel must hold it.

What the system is for

It lifts a heavy load, a machine, a structure or a section of one, by a set height, holds it there while work is done under or around it, and lowers it again. It can be one jack and a hand pump, or several jacks tied to one controller.

Why the hold must be steel

Oil trapped in a cylinder holds a load only while nothing leaks, and a seal, a hose or a valve can fail. A lock nut run down onto the barrel, or a stack of steel packing, carries the load without oil. The system lifts with oil and holds with steel.

Why the load must be square

A jack is made for load along its own axis. A tilted base, soft ground or an off-centre load adds a sideways force the jack was not meant to carry, so the base is set firm and square and the saddle meets the load squarely.

Why several jacks must rise together

Where several jacks carry one structure and one of them leads, the structure twists and the load moves onto the jacks that lag. The lift is kept level by hand, by a flow divider, or by a sensor and valve on every jack.

Why the pressure is read

The pressure in a jack follows the load divided by the plunger area. A reading at each jack shows how the load is shared, and whether one jack is carrying more than its part.

Why lowering has its own rule

To lower, the load is first taken back onto the oil, then the lock is freed, then the load is let down slowly. The nut is never backed off while it still carries the load.

The method

Select, set, lift, lock, work, and lower.

Six steps in a fixed order. The two shaded steps are the ones a rushed job skips.

FIG · 02HYDRAULIC JACKING SYSTEM · SELECT / SET / LIFT / LOCK / WORK / LOWER — OIL LIFTS, STEEL HOLDS

The step people underrate is the mechanical hold. A load held only by oil is a load waiting for a seal to fail.

Fig · 03 — Three ways a lift goes wrong: side load, unlevel rise and an oil-only hold — a drawing of the idea, with no values.

1 · Select

The jack, its stroke and its base are chosen from the load, the height to be gained and the room under the load.

2 · Set

The base rests on firm, level ground or a spreader plate, the jack stands square, and packing is laid ready under the load.

3 · Lift

The load is raised in small steps, with pressure and height watched at each jack, so that it rises level.

4 · Lock

The lock nut is run down onto the barrel, or the load is cribbed on steel packing, before anyone works under or near it.

5 · Work

The oil is released and the steel carries the load. The height is watched, to show that nothing has moved.

6 · Lower

The load is taken back onto the oil, the lock is freed, and the load is let down slowly, in small steps.

Work content

What the system contains, element by element.

Read it as a checklist: a system missing a row will buy that row back later, usually as a lift nobody is quite happy to stand near.

A single synchronised lifting set-up: a grey box-section steel platform raised level on four identical grey hydraulic jacks, one under each corner, with a black hose from each jack to one steel manifold block on the floor and a plain steel control enclosure on a short stand beside it, and no people

Fig · 04 — A platform raised level on four cylinder jacks, with a hose from each jack to one manifold and a control enclosure beside it — illustrative render.

Element	What it does	What matters
Jack cylinders	lift the load	solid or hollow plunger, single or double acting, chosen from the load, the stroke and the height available
Lock nut or packing	holds the load without oil	a steel collar on the barrel, or cribbing, so that nobody works under a load held by oil alone
Bases & saddles	spread the load into the ground and the structure	a firm base, a spreader plate where the ground needs one, and a saddle that meets the load squarely
Pump set or power pack	supplies the oil	hand, electric or air-driven, with a relief valve set for the jack and a release valve that lowers slowly
Hoses & couplings	carry the oil	rated for the working pressure, routed clear of the load, with couplings that are fitted and released only when the jack is unloaded
Manifold & valves	share the oil among the jacks	a valve for each jack, so that each can be raised, held or lowered on its own
Synchronising control	keeps several jacks level	a flow divider, or a position sensor and valve on every jack, with the pressure read at each
Instruments	read pressure and height	pressure at each jack and height at each corner, logged for the record
Safety circuit	protects people and the structure	pressure limits, a hold that stops a runaway, and a stop that keeps every jack where it is
Lift plan & procedure	fix the sequence	select, set, lift, lock, work and lower, the same for every lift, written from the load and not from the jack
Testing & documentation	prove the set first	each jack proved and the set checked before handover, with a record the customer can inspect

The weak link in a lift is rarely the jack. It is the ground under it, and the squareness of the load on it. A jack on a base that gives, or under a load that is off its axis, is working outside what it was made for.

Fig · 05 — One lift, three ways to keep it level: by hand, with a flow divider, or closed loop, chosen to suit how unequal the loads are.

Full specification — expand

System	Cylinder jacks with a plunger and saddle, solid or hollow, single or double acting; a mechanical lock nut or steel packing that holds the load without oil; firm bases and spreader plates; a pump set, hand, electric or air-driven, or a power pack; hoses and couplings; a manifold with a valve for each jack; for several jacks, a flow divider or a position sensor and valve on every jack; pressure and height instruments; a safety circuit; a lift plan and procedure; and testing and documentation before handover
The One Idea	Oil lifts the load, and steel must hold it.
Why The Hold Must Be Steel	Oil trapped in a cylinder holds a load only while nothing leaks, and a seal, hose or valve can fail, so a lock nut run down onto the barrel or a stack of steel packing carries the load without oil and nobody works under a load held by oil alone
Why The Load Must Be Square	A jack is made for load along its own axis, so a tilted base, soft ground or an off-centre load adds a sideways force the jack was not meant to carry, and the base is set firm and square with the saddle meeting the load squarely
Why Jacks Must Rise Together	Where several jacks carry one structure and one leads, the structure twists and the load moves onto the jacks that lag, so the lift is kept level by hand, by a flow divider, or by a sensor and valve on every jack
Why Pressure Is Read	The pressure in a jack follows the load divided by the plunger area, so a reading at each jack shows how the load is shared and whether one jack carries more than its part
Why Lowering Has Its Own Rule	To lower, the load is first taken back onto the oil, then the lock is freed, then the load is let down slowly, and the nut is never backed off while it still carries the load
Standards	ASME B30.1 is the public safety standard for jacks, industrial rollers, air casters and hydraulic gantries, and ISO 4413 is the public reference for the safety of hydraulic fluid power systems. Neither sets the capacity, the stroke or the pressure a particular lift needs: those come from the customer's load, and this page prints none of it. Approval of a lift plan rests with the customer and the authority they name; none is claimed here
Configurations	A single jack set with a pump set and a lock nut, a power-pack lift with several jacks on one manifold, and a synchronised lift with a sensor on every jack and a controller
Scope Boundary	This is the system that lifts and holds heavy loads on cylinder jacks. It is not a re-railing jack (see hydraulic jack machine), not a tool that tightens bolts (see hydraulic torque wrench system), not a plant-scale power skid (see hydraulic power pack and actuator system), and not a crane or lifting appliance: no certification of one is claimed here
Status	Neometrix has quoted against successive hydraulic jack and jacking system requirements, and no delivered heavy-lift hydraulic jacking system is claimed.

Configurations

One method, three ways to supply the system.

The method, the record and the lock rule are shared. What changes is how much of the system is supplied.

Single jack set

Jack, pump set and lock nut

One jack with a hand, electric or air-driven pump set and a lock nut, made to the customer's load and height.

Power-pack lift

Jacks, manifold and power pack

Several jacks on one manifold with an electric power pack, each raised, held or lowered on its own valve.

Synchronised lift

Jacks, sensors and controller

A sensor on every jack and valves that trim, so that several jacks carry one structure up level, with a record.

Fig · 06 — Three ways to supply the system, one method: a single jack set, a power-pack lift, or a synchronised lift.

And the part that is not equipment at all, yet decides all three: the lift plan. It fixes the load, the jack positions, the order of lifting and the packing, and it is written from the load, not from the jack.

Where it is used

Wherever a heavy load has to be raised, held and lowered again.

The common thread is a load too heavy to move by hand, and too awkward for a crane to hold still while work is done.

Power plant and machinery

Where heavy machine parts are raised for overhaul and set back after it, and must be held while the work goes on.

Bridges and structures

Where bearings are replaced and a span or a vessel is raised level, held and lowered back.

Yards and heavy fabrication

Where large sections are raised, shifted and set down, and long shafts are drawn out and returned.

Press and mill maintenance

Where heavy rolls, dies and press parts are lifted clear for repair and lowered into place.

FAQ

Common questions.

Longer answers, for readers who want the reasoning.

Q · 01 How does a hydraulic cylinder jack work?

A pump pushes oil into the cylinder under the plunger. The pressure acts over the plunger's area, so a modest pressure gives a large force: the force is the pressure multiplied by the area. The plunger rises and the load rises with it, and the oil stays trapped when the pump stops. A release valve lets the oil out again so that the load comes down. The pump can be a hand lever, an electric unit or an air-driven one, and the jack does not care which.

Q · 02 Why is a lock nut needed if the oil holds the load?

Because oil holds a load only while nothing leaks. A seal can wear, a hose can fail and a valve can creep, and the load then sinks, sometimes quickly. A lock nut run down onto the barrel carries the load on steel, so the pressure can be released and the jack becomes a mechanical support. Where no nut is fitted, steel packing under the load does the same job. The rule is simple and old: nobody works under a load that is held by oil alone.

Q · 03 How do several jacks lift one structure level?

In three ways, in rising order of exactness. By hand, an operator trims each jack by eye. With a flow divider, the oil is split among the jacks, which is simple but drifts when the loads differ. With a closed loop, a sensor on every jack reports its height and a valve trims it, so the structure rises level even when the loads are unequal. The more the loads differ, the more the lift needs feedback. The pressure at each jack is read throughout, because it shows how the load is being shared.

Q · 04 Is this the same as the hydraulic jack machine, hydraulic torque wrench system or power pack pages?

No, and the differences are worth stating precisely. The hydraulic jack machine page is a portable tilting jack for re-railing work, with its own pack, where this page is a heavy-lift system of cylinder jacks with a mechanical hold. The hydraulic torque wrench system page is a hydraulic tool that tightens bolts, not one that lifts a load. The hydraulic power pack and actuator system page is a plant-scale power skid for actuators, where the pump set on this page is a small unit that drives jacks. This page does not replace any of them, and it does not claim what they claim a second time.

Q · 05 What can the system not do?

It lifts and holds, and it does not travel: a jack raises a load by one stroke, and moving a load across a floor or over a distance needs skates, rollers or a crane, none of which this page claims. It is not a crane or a lifting appliance, and no lifting-appliance certification is claimed: this page claims none. It cannot make a poor base safe, which is why the ground, the packing and the lift plan are checked before any load is raised. No load, pressure or stroke figure is printed here, and approval of a lift plan rests with the customer and the authority they name; none is claimed here.

Q · 06 Has Neometrix built one of these?

We would rather answer this plainly than let a page imply otherwise. Neometrix has quoted against successive hydraulic jack and jacking system requirements, and no delivered heavy-lift hydraulic jacking system is claimed. What stands behind the offer is adjacent: Neometrix engineers hydraulic power packs and actuator systems (see the hydraulic power pack and actuator system page) and a portable hydraulic jack for re-railing work (see the hydraulic jack machine page). The standard jack cylinders, pump sets, hoses, couplings and sensors are catalogue items, bought in, not invented. What Neometrix engineers is the system around them: the jack selection, the bases and saddles, the power pack and manifold, the mechanical hold, the synchronising control, the lift plan, the procedure and the records. So the honest position is that the system is engineered to order, the neighbouring disciplines are in the building, and the first system of this exact kind will be built around the customer's own load and lift plan rather than taken off a shelf.

Q · 07 Which standards apply, and who sets the capacity?

ASME B30.1 is the public safety standard for jacks, industrial rollers, air casters and hydraulic gantries, and ISO 4413 is the public reference for the safety of hydraulic fluid power systems. Neither sets the capacity, the stroke or the pressure a particular lift needs: those come from the customer's load and lift plan, and this page prints none of it. Acceptance of the finished system, including its proving runs before handover, rests with the customer and whatever authority they name.

Q · 08 What do you need from us to quote?

Six things, and most of them describe your load rather than the jacks. First, the load: its weight, its shape and the points it can be lifted from. Second, the lift: the height to be gained, the time available and how often it is repeated. Third, the base: the floor or ground under each jack and the room round it. Fourth, the control: one jack or several, and how level the lift must stay. Fifth, the hold: lock nut, packing or both, and the site's rules for working near a lifted load. Sixth, the record: the pressure and height readings you want kept. From that we come back with a set list, a written lift plan you can check, and a budgetary price.

The neighbouring hydraulic pages, and how they differ from this one.

Three neighbours: a portable tilting jack, a tool that tightens, and a plant-scale power skid.

↗ A portable tilting jack

Hydraulic Jack Machine

A portable jack for re-railing work - one tool with its own pack, not a system of jacks.

↗ A tool that tightens

Hydraulic Torque Wrench System

A hydraulic tool that tightens bolts - the opposite job to lifting a load.

↗ A plant-scale power skid

Hydraulic Power Pack and Actuator System

A large power skid for actuators - the pump set here is a small unit that drives jacks.

Browse all Neometrix product lines.

Get a quotation

Tell us the load, the lift,
and the base.

The projects desk replies within two working days with a set list, a written lift plan you can check, and a budgetary quotation. Write to [email protected] or use the form.

Enquire — hydraulic jacking system Capability sheet (PDF) +91 7777 876 876

ISO 9001 / 14001 ENGINEERED-TO-ORDER CLASS — HYDRAULIC JACKING SYSTEM SELECT · SET · LIFT · LOCK · WORK · LOWER — OIL LIFTS, STEEL HOLDS ENGINEERED IN NOIDA · INDIA