what is a slewing mobile crane? - easy...

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What is a slewing mobile crane?A slewing mobile crane is a powered crane which features a boom or jib that can slew from front to back. The crane is mounted on a vehicle. This course does not cover front end loaders, backhoes, excavators or similar equipment.

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Required Knowledge 2.0 -

High Risk Licensing and the Law

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Required Knowledge 2.0 - High Risk Licensing and the Law

Crane and hoist operation:• Tower cranes• Self-erecting tower cranes• Derrick cranes• Portal boom cranes• Bridge and gantry cranes• Vehicle loading cranes• Non-slewing mobile cranes• Slewing mobile cranes• Material hoist• Personnel and materials hoist• Boom-type elevating work platform• Vehicle-mounted concrete placing boom

Forklift operation:• Forklift truck

• Order-picking truck

Pressure equipmentScaffolding workRigging workDogging work

NOTE: Earthmoving equipment is NOT included in the new National Standard.

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Required Knowledge 2.0 - High Risk Licensing and the Law

Required Knowledge 2.0

Question RK 2 (h)You must renew your high risk work licence after how many years?

Answer:5 years.

Don’t forget. Set yourself a reminder before the due date.

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Element 1

Plan Work

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Element 1 - Plan Job

Performance criterion 1.1

Question 1.1 (c)You’ve already planned for site hazards. What other things do you plan for before using the crane?

Answer: Some things to plan for are:

What are some problems or challenges at this site?

How will you get in and out of the site?

Who do you need to talk to?

Where will you use the crane?

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Element 1 - Plan Job


Question 1.6 (e)Whenwouldyoucommunicatewiththecraneoperatorusingafixedtwo-wayradio?

Answer:

When the crane operator can’t see you.

If other cranes and doggers are using whistles in the area.

If it’s too noisy to hear whistles.

If you think it’s the best way for the job you are doing.

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Element 2

Conduct Routine Checks

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Element 2 - Conduct Routine Checks


Question 2.4 (a)Why is it important to check the crane and equipment before use?

Answer:The crane and equipment must be safe to use. The crane must be right for the job.

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Element 2 - Conduct Routine Checks

Question 2.4 (f) continued

Has been exposed to high heat. For example 280 degrees Celsius.

Cracked or twisted hook

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Element 3

Set Up Crane

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Why you need packingYou must use packing under the outriggers. Each outrigger takes some of the weight of the crane and the load. Packing spreads that weight over a larger area. This makes the crane more stable.

How soil types affect packingThe type of ground you are working on changes how much packing you need. For example, if you need to set up on soft clay you will need more packing than if you are setting up on shale or rock.

If you do not use packing the outriggers could sink and the crane could tip over.


Element 3 - Prepare Site and Equipment

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Element 3 - Prepare Site and Equipment


Question 3.7 (a)You have done your post operational checks. You are about to lift a load. Why should you test your communication equipment?

Answer:To make sure you and the dogger can hear each other.

S A M P L ECan you hear me? Yes.


Element 4

Transfer Load

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Element 4 - Transfer Load


Question 4.1 (d)You are looking at the load chart and working out how much the crane can lift. What do yousubtractfromtheratedcapacity,tofindouthowmuchthecranecanlift?

Answer: Subtract:

Mass of lifting attachments (for example, beams, kibbles)

Mass of hook block Mass of lifting gear (for example, slings).

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Question 4.1 (g)A slewing mobile crane’s boom can slew from front to back. What does slewing like this do to the crane’s capacity?

Answer:The crane’s capacity changes when slewing from front to back. Always check the load chart to make sure the crane will stay within its capacity.

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Load ratings on rubber - KGs

Oper

ating

Ra

dius

(M)

StationaryMobile Over

Front

Front 360O Creep 4KPH

3.00 13,500 8,500 12,000 7,500

3.50 12,000 6,500 10,000 6,500

4.00 10,500 5,000 8,500 5,500

4.50 6,500 4,000 6,000 4,600

5.00 4,500 3,000 5,500 4,000

6.00 3,100 2,200 3,950 3,000

7.00 2,500 1,500 3,000 2,500

8.00 1,900 1,000 2,100 2,000

9.00 1,500 500 1,500 1,500

10.00 1,000 1,200 1,000

12.00 500 100 800

14.00500

With 4.5m ‘A’Frame Jib in stowed or

operating position, powered boom ratings

should be reduced accordingly

Equipped With Jib Stowed Jib Erected

Boom Deduction 180 kilograms 320 kilograms

Hoist reeving

Wire Rope: 13mm Diameter, Minimum Breaking Strength 118KN

Permissible line Loads in KGS

Parts Line1 2 3 4 5 6 7

Main3,000 6,000 9,000 12,000 15,000 18,000 20,000

Load Chart - Up to 20 Tonne (A)ON RUBBER RATINGS NOTES

Crepe is motion for less than 61 metres in a 30 minute

period and not exceeding 1.6KM/H.

INFORMATION

1. Ratings above heavy line are based on structural

limits and not on machine stability. Stationary load

ratings do not exceed 75 per cent of tipping loads.

Mobile load ratings do not exceed 66 per cent of

tipping loads.

WARNINGSWhen transporting a load, the machine must be on

a firm level ground with load centred over the front

and restrained from swinging with mechanical swing

lock engaged.

Load ratings are based on lift limitations and

conditions of tyres inflated to pressures shown and

apply only when axle lockouts are engaged.

Use of jib on rubber ratings is not approved.

Ratings are limited to fully retracted boom.

Load lifted over front or rear and swung over side

with increase in radius due to tyre deflection. The

increase in radius must be compensate for by raising

boom or machine may tip over.

DEFINITIONSOperating radius is the horizontal distance from the axis of

rotation before loading to the centre of the vertical hoist line

or tackle with load applied.

Loaded boom angle is the included angle between the

horizontal and longitudinal axis of the boom base after lifting

rated load at rated radius (see warning notes).

INFORMATION

Crane load ratings are for machines with 1940 kgs of

counterweight and do not exceed 75 per cent of tipping loads

without stowed JIB.

Ratings above heavy line are based on the machine’s hydraulic

or structural competence and not on machine stability.

Weights of hooks, hook block(s), slings and all other load

handling devices shall be considered a part of the load.

Crane load riggings with outriggers are based on outriggers

fully extended set to a distance of 2.5m. From the longitudinal

axis of the carrier to the outrigger float pivot connection with

all load removed from carrier wheels.

WARNINGSFor boom lengths less than 23.6m. With manual section

extended the loads are determined by boom angle only in the

column headed by 23.6m boom.

WARNING: Do not exceed maximum

radius for each column or a tipping

condition will occur.

Reading Load ChartsFor all mobile slewing crane classes


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Using Load ChartsYou are to operate a mobile slewing crane. You will need to work out (calculate) information such as:

To do this you must look at the Load Chart for your crane. There is a lot of information on a Load Chart.WithpracticeyouwilllearnwhichtablestolookatontheLoadCharttofindtheinformationyouneed.YouwillalsogetusedtoreadingtheNotesandDefinitionsontheLoadCharttohelpyouwork out important information.

Maximum load that can be lifted

How many parts of line are needed

The weight of hooks and blocks



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360O Load ratings in kilograms with outriggers extended

Oper

ating

Ra

dius

(M) Boom Length

Oper

ating

Ra

dius

(M)

8.5 10 12 14 16 18.2 20.4 23.6

KGs KGs KGs KGs KGs KGs KGs KGs2.50 60 20,900 2.503.00 56 19,800 65 18,300 70 16,800 75 1,350 3.003.50 52 18,300 62 16,800 67 14,500 71 12,500 74 11,500 3.504.00 48 16,800 59 15,300 65 13,500 69 12,100 72 10,500 74 10,500 4.004.50 44 15,300 54 13,800 62 12,200 66 11,200 70 10,000 72 10,200 4.505.00 40 13,800 46 12,300 59 11,000 59 10,300 68 9,000 71 9,500 72 9,500 5.006.00 25 12,300 38 11,200 53 9,400 53 9,400 64 6,500 67 8,500 69 8,200 6.007.00 30 10,100 45 6,300 48 6,500 58 5,200 62 6,300 65 6,500 70 5,450 7.008.00 18 9,000 38 5,100 42 4,500 50 4,000 58 5,200 62 5,200 69 5,000 8.009.00 29 4,000 34 3,000 44 3,500 54 4,000 58 4,000 68 4,500 9.00

10.00 32 2,500 50 3,500 46 3,500 64 4,000 10.0012.00 41 2,500 36 2,500 60 2,500 12.00

Step 1: Find the 14 metre boom length column on the table. The boom lengths are labelled across the top of each column.

Step 2: Find the 5 metre

operating radius. The operating

radius in metres is shown in the

left column. Follow down the rows until you findthe5metre

radius.

Step 3: Follow the 5 metre radius

row along until you meet the 14

metre boom length column. That is the

load rating that you are looking for.

Answer 4.1 (i): 10,300 kg



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Element 5

Mobile Load

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Element 5 - Mobile Load


Question 5.1 (a)Whyisitbesttomobile(drive)thecraneonfirmandlevelsurfaces?

Answer: To help keep the crane stable and stop load swing.

Keeponfirmlevelsurface

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Element 5 - Mobile Load

Question 5.3 (b) continued

Move slowly.

Keep the load as low as you can.

Keep the radius and boom angle small.

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Element 6

Shut Downand Secure Crane

ON

OFF

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Element 6 - Shut Down and Secure Crane


Question 6.1 (a)Is it OK to leave a load hanging from the hook after you’ve shut down the crane?

Answer: No. The winch or boom could creep (the load might drop down slowly). The boom may slew.

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Element 6 - Shut Down and Secure Crane

Question 6.6 (a) continued

Check the tyres are pumped up and not damaged

Check that the hook is secure

Checkforfluidleaks (oil,water,fuel,hydraulicfluid)

Make sure outriggers are retracted.S A M P L E

what is a slewing mobile crane? - easy...

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