31b telescoping 2

SUMMARY

31B−0000−039−0−GB 1 8−11−05

� .POTAIN. 2002.Any reproduction

for commercial purpose is forbidden.

31B − TELESCOPING 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. GENERAL INSTRUCTIONS 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. HANDLING THE TELESCOPIC CAGE 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. PREPARING TELESCOPING 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. 1. GENERAL NOTES 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. 2. FITTING THE TELESCOPING YOKE 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. 3. FITTING THE CAGE 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. 4. FITTING THE MONORAILS 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. 4. 1. FITTING THE MONORAILS IN THE AIR 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. 4. 2. FITTING THE MONORAILS ON THE GROUND 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. 5. FITTING THE MONORAIL TROLLEY 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. BALANCING FOR TELESCOPING 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4. 1. GENERAL INSTRUCTIONS 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4. 2. PARTICULAR INSTRUCTIONS 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4. 3. BALANCING THE CRANE 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4. 3. 1. PREPARING 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4. 3. 2. BALANCING THE CRANE 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. TELESCOPING SEQUENCES 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. 1. GENERAL NOTES 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. 2. PRINCIPLE 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. 3. INTRODUCING THE MAST SECTION 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. 4. HANGING THE 2ND MAST SECTION FROM THE MONORAILS 15. . . . . . . . . . . . 5. 5. END OF TELESCOPING 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. 5. 1. GENERAL INSTRUCTIONS 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. 6. FOLDING DOWN OR DISMANTLING THE MONORAILS 16. . . . . . . . . . . . . . . . . . . . 5. 6. 1. FOLDING DOWN THE MONORAILS 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. 6. 2. DISMANTLING THE MONORAILS 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. 7. LOWERING THE TELESCOPIC CAGE 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. 7. 1. PREPARING 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. 7. 2. LOWERING THE TELESCOPIC CAGE 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6. DISMANTLING AND REFITTING THE TELESCOPIC CAGE 23. . . . . . . . . . . . . . . . . . . 6. 1. DISMANTLING THE TELESCOPIC CAGE 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6. 2. REFITTING THE TELESCOPIC CAGE 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

353393-MCR225A

353393-MCR225A

TELESCOPING

31B−0400−011−0 8−11−0531B−0000−039−0 / 2� .POTAIN. 2002.

Any reproduction for commercial purpose is forbidden.

31B − TELESCOPING

1. GENERAL INSTRUCTIONS� The slewing crane part must be balanced compulsorily when the telescoping assembly is lifted or

being lifted and during the introduction of a mast section.

The wind speed is limited to 50 km/h.Working in height (danger of fall) must be carried out with the safety harness.

� The wind speed is limited to 50 km/h.

� IT IS FORBIDDEN:

� to slew the jib

� to operate the hoist winch (Hoisting or Lowering) when the telescoping assembly is lifted or beinglifted

� to operate the luffing motions of the jib when the telescoping assembly is lifted or being lifted

� to keep the telescoping assembly resting on the cylinder

� Use of the safety pins when telescoping:

� The telescopic cage is equipped with 4 pins of which the diameter has been reduced by 2 mmin order to make their fitting easier.

� These pins, connected to the telescopic cage by means of a chain, are ONLY TO BE USED FORTELESCOPING.They ensure the connection between the fixed towerhead or connecting mastand the last telescoped mast section on each mast level.

� They must be fitted on the lateral sides.

� At the end of telescoping and before unpinning the connection of telescopic cage/fixed towerheador connecting mast and lowering the telescopic cage, they must be replaced by the normal mastpins.

It is strictly forbidden to put the crane into service before placing the normalworking pins.

� Interruption of telescoping:

� The last mast section must be pin−connected to the crane tower with the normal pins.

� The towerhead or the connecting mast must be pin−connected to the last mast section of thecrane tower with the normal working pins.

� The balancing load must be laid down.

� There is no mast section hanging from the monorail trolley. The latter must be lowered to theground.

� The pulley block must be raised under the jib, so that it cannot get caught by the monorail(s) whenthe crane is weathervaning.

� For SHIFT END, observe the instructions given.

INSTRUCTIONS FOR THE SHIFT END 26 M

353393-MCR225A

TELESCOPING

31B−0400−011−0 8−11−0531B−0000−039−0 / 3� .POTAIN. 2002.


2. HANDLING THE TELESCOPIC CAGE

2. 1. LOWERING THE TELESCOPIC CAGE BY MEANS OF THE CRANE

COMPULSORILY consult us.

THIS PROCEDURE IS FORBIDDEN IF THE WEIGHT OF THEEQUIPPED TELESCOPIC CAGE IS HIGHER THAN THEMAXIMUM WEIGHT OF THE CRANE IN THE CHOSEN CON-FIGURATION.

10 A

2. 2. MOUNTING THE TELESCOPIC CAGE BY MEANS OF THE CRANE

COMPULSORILY consult us.

THIS PROCEDURE IS FORBIDDEN IF THE WEIGHT OF THEEQUIPPED TELESCOPIC CAGE IS HIGHER THAN THEMAXIMUM WEIGHT OF THE CRANE IN THE CHOSEN CON-FIGURATION.

10 A

FOR CRANES WITH A LOWER MAXIMUM LOAD, it is possible to lay down the hydraulic unit, thehydraulic cylinder and the telescoping yoke in order to reduce the weight of the assembly to be handledwithout exceeding the maximum load of the crane.

If, despite of removing the accessories, the weight is higher than the maximum load of the crane, THETELESCOPIC CAGE MUST COMPULSORILY BE LOWERED AGAIN BY MEANS OF THEHYDRAULIC CYLINDER.

ALL THESE OPERATIONS MUST BE CARRIED OUT WITH ADJUSTED SAFETY DEVI-CES.

353393-MCR225A

TELESCOPING

31B−0540−020−0 8−11−0531B−0000−039−0 / 4� .POTAIN. 2002.


3. PREPARING TELESCOPING

3. 1. GENERAL NOTES

Carry out the electrical and hydraulic connections of the hydraulic unit and of the cylinder.

i

HYDRAULIC UNIT / Electrical connection

HYDRAULIC CYLINDER FOR TESCOPING / Hydraulic con-nection

85M87M

Preparation for telescoping consists of placing the accessories required for telescoping.

Most are placed during fitting of the relevant crane part without being «ready to work» as such.

These appliances are tested and guaranteed by the constructor. In the case of serious breakdown, it isadvisable to contact our After−Sales−Service rather than to carry out a faulty repair which could be dan-gerous and cancel the guarantee.

3. 2. FITTING THE TELESCOPING YOKE

This operation is carried out when lowering or re−raising the telescopic cage along the mast tower.

Use a long double sling (1) so as to better guide the yoke against the mast.

1

Position the yoke exactly opposite a set of telescoping lugs.

Hook the yoke (2) onto the telescoping lugs (3) using support shoes (4); lock it by means of plates (5)screwed onto the support shoes by the screw bolts (6).

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353393-MCR225A

TELESCOPING

31B−0540−020−0 8−11−0531B−0000−039−0 / 5� .POTAIN. 2002.


3. 3. FITTING THE CAGE

Fixing the telescopic cage on the towerhead:

It is recommended to carry out this operation during the erection. There are two possibilities:

� Using the cylinder in the case of a short movement:

� Put the hydraulic system into service. When the yoke is fixed on the lugs, carry out a stroke untilthe cage uprights (1) can be introduced into the towerhead gussets (2). Pin−connect using pins(3) and fix with split−pins.

� Using slings:

� Either by means of the mobile crane during erection

� Or using the crane after its putting into service for a height increase or for dismantling

Use a 4 m sling which runs around the rear cage beam at the level of the cylinder attachment (4).Remove the device locking the cage on the basic mast. Lift up and guide using a crowbar untilthe cage uprights are inserted in the towerhead gussets (2). Then pin−connect using pins (3) andfix with split−pins.

DURING THIS OPERATION COMPENSATE AS MUCH AS POSSIBLE THE LATERALFORCES DUE TO THE SLING TRACTION IN ORDER TO AVOID LOCKING THE TELE-SCOPIC CAGE ON THE MAST.

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353393-MCR225A

TELESCOPING

31B−0540−020−0 8−11−0531B−0000−039−0 / 6� .POTAIN. 2002.


3. 4. FITTING THE MONORAILS

The monorails are fitted onto the fixed towerhead or the connecting mast. This operation can be carriedout:

� In the air, before telescoping.

� On the ground, before fitting the towerhead or the connecting mast.

3. 4. 1. FITTING THE MONORAILS IN THE AIR

Fitting the monorails is carried out by means of the telescoping hook.

iBALANCING WHEN TELESCOPING / Utilization of theequipment

32B

� Fit the plates (1) by means of the pins (2) onto the gussets (3) of the towerhead or of the connectingmast. Fit the pins (4) onto the plates (1).

� Using the telescoping hook (5), pick up the first monorail (6) by the round bar (7) and lift it until it canbe pin−connected to the plates (1) by means of the pin (4).

� Lock the monorail (6) on the plates (1) by means of the pin (8).

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353393-MCR225A

TELESCOPING

31B−0540−020−0 8−11−0531B−0000−039−0 / 7� .POTAIN. 2002.


� Lower the pulley block, the monorail folds down alongside the mast. Hook the telescoping hook (1)to the round bar (2) placed at the end of the monorail.

� Raise the monorail (3) in horizontal position, remove the pin (4).

� Operate ”Trolley in” until the monorail (3) can be pinned to the gussets (5) by means of the pin (6),then to the gussets (7) by means of the pin (8).

� Remove the pin (9), then raise the plates (10) and refit the pin (9) as well as the pin (4).

� Proceed in the same way for fitting the second monorail.

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353393-MCR225A

TELESCOPING

31B−0540−020−0 8−11−0531B−0000−039−0 / 8� .POTAIN. 2002.


3. 4. 2. FITTING THE MONORAILS ON THE GROUND

The fitting operations are identical with those of fitting in the air (preceeding paragraph), on the other hand,handling the monorails will be carried out by means of the mobile crane and a sling instead of the telescop-ing hook.

3. 5. FITTING THE MONORAIL TROLLEY

Lifting the monorail trolley (1) with or without mast section is carried out by means of the telescoping hook(2).

� The monorail trolley is fixed onto the upper mast uprights (3) by means of the fixing brackets (4) by4 fishplate bolts (5):

� When fitting on the ground onto the mast sections which have been just assembled.

� When dismantling in the crane tower onto the standard mast section to be dismantled.

� Observe the direction of the guides (6) (on the side of the telescoping lugs) and the fitting directionof the screw bolts (5).

In order to put the monorail trolley alone into the telescopic cage or to take it out of the cage, the fixingbrackets (4) must be placed in folded up position. Operate in the direction of the arrows.

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353393-MCR225A

TELESCOPING

31B−0600−018−0 8−11−0531B−0000−039−0 / 9� .POTAIN. 2002.


4. BALANCING FOR TELESCOPING

4. 1. GENERAL INSTRUCTIONS

Balancing for telescoping is carried out in two phases:

�Theoretical by hanging a load at a given radius.

� Practical by adjusting the jib position.

BALANCING WHEN TELESCOPING 32B

Reminder: It is strictly forbidden to SLEW the jibto OPERATE the luffing motions of the jibto OPERATE the hoist winch (hoisting or lowering)

when the telescoping assembly is lifted or being lifted.

4. 2. PARTICULAR INSTRUCTIONS

The good working order of the telescoping assembly (cylinder and telescopic cage) needs that the centerof gravity of the lifted crane part is located in the cylinder axis. Make sure too, that one mast section ishanging from the monorails before balancing.

Move the jib with or without load to the theoretical balancing distance.


The indicated distances are theoretical; they especially depend on the actual weight of the counter−jibballast.

Furthermore, the wind has a considerable action on the crane balance, telescoping is no longer allowedbeyond 50 km/h.

353393-MCR225A

353393-MCR225A

TELESCOPING

31B−0640−017−0 8−11−0531B−0000−039−0 / 10� .POTAIN. 2002.


4. 3. BALANCING THE CRANE

4. 3. 1. PREPARING� Check that a mast section is hanging from the monorails.

� Check that the telescopic cage is pin−connected to the towerhead or to the connecting mast.

� Move the jib with or without load to the theoretical balancing distance.


� Remove the fishplate pins of the last mast section connecting it with the towerhead or the connectingmast.

4. 3. 2. BALANCING THE CRANE

� Balancing can only be carried out if the towerhead feet (1) are lifted off of the mast fishplates (2).

� Operate the hydraulic unit lever in ”Up“ direction and telescope until the towerhead feet are lifted offof the fishplates.

� Check the balancing of the crane and, if necessary, readjust it by modifying the jib radius.

� The exact position will be found by checking the alignment of the towerhead feet with the mast fish-plates and by reading the minimum pressure, necessary for telescoping, on the pressure gauge ofthe hydraulic unit.

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2

353393-MCR225A

TELESCOPING

31B−0700−021−0 8−11−0531B−0000−039−0 / 11� .POTAIN. 2002.


5. TELESCOPING SEQUENCES

5. 1. GENERAL NOTESThe whole telescoping operations are carried out from the telescopic cage catwalks.

5. 2. PRINCIPLEThe telescoping sequence comprises a series of operations which are repeated several times:

� Lifting the crane part to be telescoped by extending the cylinder which rests on the telescoping yoke(1).

� Resting the lifted crane part on the lugs (2) of the mast by means of the support shoes (3) of the telescopic cage.

� Remove the safety wedges (4) which lock the support shoes (5) on the lugs (6).

� Unhook the support shoe/yoke assembly, release it from the lugs and raise it by retracting the cylinder.

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34

353393-MCR225A

TELESCOPING

31B−0700−021−0 8−11−0531B−0000−039−0 / 12� .POTAIN. 2002.


� Rest the assembly on the next pair of lugs above (1).

� Repeat this cycle 3 times so as to have the space required (X) for introducing the mast section intothe telescopic cage.

�The crane is now in the position according to fig. A.

1

X

A

353393-MCR225A

TELESCOPING

31B−0700−021−0 8−11−0531B−0000−039−0 / 13� .POTAIN. 2002.


5. 3. INTRODUCING THE MAST SECTION

� The lifted crane part is resting on the upper lugs (1) of the last mast section by means of the supportshoes (2) of the cage. The cylinder is almost entirely extended and the total stroke does not allow thatthe upper guide rollers of the telescopic cage lift off of the fixed part of the crane tower.

� Slide the mast toward the inside and introduce it into the cage, see fig. A.

� Operate “Up” with the hydraulic group lever so as to release the support shoes (2) from the lugs (1).Keep the support shoes away from the mast using the control rod (3).

A

3

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2

353393-MCR225A

TELESCOPING

31B−0700−021−0 8−11−0531B−0000−039−0 / 14� .POTAIN. 2002.


� Operate “Down” with the hydraulic group lever and make sure that the mast section (1) engages cor-rectly into the fishplates (2). Pin this mast section using 4 x 2 pins, drifts and split pins.

� Raise the ladder which pivots at (3) up to its upper fixing position and engage the tenons of the ladderuprights in the ladder of the lower mast section (4).

� Unbolt the monorail trolley from the four attachment points of the mast (5), fold up the fastening brack-ets (6) and push the monorail trolley out of the telescopic cage.

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353393-MCR225A

TELESCOPING

31B−0700−021−0 8−11−0531B−0000−039−0 / 15� .POTAIN. 2002.


5. 4. HANGING THE 2nd MAST SECTION FROM THE MONORAILS

� To hang the mast section to be telescoped from the monorails, it is essential that the lifted crane partis solidly anchored to the fixed towerhead.

� For this, operate “Down” with the lever of the hydraulic group until the towerhead feet (1) engage inthe fishplates of the last mast fitted.

� Fit 4 safety drifts instead of the pins (2).

� If required, lower the balancing load, hang the monorail trolley from the pulley block.

� Hook another mast section fitted with its accesses on the monorail trolley (3) and raise it to the mono-rails (4).

� If required, retake the balancing load and balance the crane. Unpin at (2).

� Another telescoping sequence can be started. Repeat it until the required height is reached.

iBEFORE FITTING THE LAST MAST SECTION EQUIPIT WITH THE PLATFORM GIVING ACCESS TO THE TO-WERHEAD

30A

THE LAST MAST SECTION MUST BE FIXED TO THE CRANE TOWER AS WELL AS TOTHE TOWERHEAD FEET OR THE CONNECTING MAST.

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353393-MCR225A

TELESCOPING

31B−0740−011−0 8−11−0531B−0000−039−0 / 16� .POTAIN. 2002.


5. 5. END OF TELESCOPING

5. 5. 1. GENERAL INSTRUCTIONS

Having completed telescoping:

� Dismantle the telescopic cage

or

� Lower the telescopic cage as low as possible:

� For cranes on chassis, the telescopic cage is lowered to the level of the first mast section abovethe chassis.

� For cranes on cross−shaped base, the telescopic cage is lowered to the level of the base ballast.

� For cranes on fixing angles, the telescopic cage is lowered to the mast section placed above thefixing angles by keeping space enough to reach the access ladders of the crane tower.

� For very high cranes (anchored or guyed crane), the telescopic cage is always lowered to the levelof the last anchorage.

and

� Fold down the monorails along the masts.

353393-MCR225A

TELESCOPING

31B−0750−011−0 8−11−0531B−0000−039−0 / 17� .POTAIN. 2002.


5. 6. FOLDING DOWN OR DISMANTLING THE MONORAILS

5. 6. 1. FOLDING DOWN THE MONORAILS

In order not to hinder the trolley movement at the minimum radius, the monorails must be folded downalong the masts. For carrying out this operation, the pulley block must be equipped with the telescopinghook.

� Remove the pins (1) and (2), then fold down the plates.

� Refit the pin (1) onto the plates (3).

� Pick up the first monorail (4) by the round bar (5) by means of the telescoping hook (6).

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353393-MCR225A

TELESCOPING

31B−0750−011−0 8−11−0531B−0000−039−0 / 18� .POTAIN. 2002.


� Remove the pins (1) and (2).

� Operate ”TROLLEY OUT” until the monorail (3) can be hooked on the pin (4), then fit the pin (5).

� Operate ”LOWERING”, the monorail (3) folds down along the masts; free the hook.

� Repeat the same operations for the second monorail.

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353393-MCR225A

TELESCOPING

31B−0750−011−0 8−11−0531B−0000−039−0 / 19� .POTAIN. 2002.


5. 6. 2. DISMANTLING THE MONORAILS

If the monorails must be removed for a reutilization on another crane:

� Hook the monorail on the round bar (1) and raise it in horizontal position. Unpin the pin (2), operate”Trolley out” and lay the first monorail on the ground.

� Proceed in the same way for the second monorail.

� Take off the monorail support plates (3) and the pins (2, 4, 5, 6 and 7) which will be reused.

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353393-MCR225A

TELESCOPING

31B−0760−019−0 8−11−0531B−0000−039−0 / 20� .POTAIN. 2002.


5. 7. LOWERING THE TELESCOPIC CAGE

5. 7. 1. PREPARING

Two cases are possible:

� 1. The crane is equipped with a SM trolley block.

It is forbidden to lower the cage by using the crane hook. The telescopic cage must becompulsorily lowered by means of the hydraulic cylinder.

2. The crane is equipped with a DM trolley block, the telescopic cage can be lowered:

� either by means of the hydraulic cylinder

� or by using the hook of the crane; for this, dismantle the telescoping hook and refit the load hook.

353393-MCR225A

TELESCOPING

31B−0760−019−0 8−11−0531B−0000−039−0 / 21� .POTAIN. 2002.


5. 7. 2. LOWERING THE TELESCOPIC CAGE

� Sling the telescopic cage on the cylinder support beam and hook it on the load hook. Choose a slingwhich is long enough and of which the diameter corresponds to the load to be supported.

� Tighten the sling but not too much.

� Check that the mast sections are pinned together and to the telescoping mast.

� Free the telescoping yoke, and immobilize it onto the telescopic cage.

� Remove the pins (1) connecting the telescopic cage to the telescoping mast.

In order to carry out the lowering operation in safety, the personnel does not remainon the cage, operate from inside the mast using the normal accesses.

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353393-MCR225A

TELESCOPING

31B−0760−019−0 8−11−0531B−0000−039−0 / 22� .POTAIN. 2002.


� Operate “Lowering”, the cage must lower by its dead weight.

� Pivot the control rod (1) in order to raise the support shoes (2).

� During this operation, counterbalance as much as possible the lateral forces due to the sling tensionso as to prevent the telescopic cage from getting blocked on the masts. The weight of the telescopingyoke, the hydraulic cylinder and the hydraulic unit contributes to this balance.

� Continue lowering the telescopic cage until the lowest possible position.

i END OF TELESCOPING − GENERAL INSTRUCTIONS

� Remove the hydraulic unit, the cylinder and the telescoping yoke and store them away.

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353393-MCR225A

TELESCOPING

31B−0800−011−0 8−11−0531B−0000−039−0 / 23� .POTAIN. 2002.


6. DISMANTLING AND REFITTING THE TELESCOPIC CAGE

6. 1. DISMANTLING THE TELESCOPIC CAGE

� Dismantle the grab rail (1) and the catwalk (2) located on the open face of the cage and lower themto the ground.

� Hook two slings (3) equipped with 2 shackles (4) on the load hook.

� Fasten the shackles (4) on the rear upper fishplates of the telescopic cage at (5).

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353393-MCR225A

TELESCOPING

31B−0800−011−0 8−11−0531B−0000−039−0 / 24� .POTAIN. 2002.


� Fit a Tirfor of 2500 daN (6) at the level of the beam carrying the cylinder. This Tirfor will keep the cagehard against the mast during the following operations: fixed point of the mast at (7), mobile point onthe rear telescopic cage beam at (8).

� Hook a ”LUGAL” type tackle (9) of 1500 daN on the upper upright of a mast section at (10), thenconnect the other end to the removable panel (11) of the telescopic cage. This tackle will hold thepanel (11) when the cage comes out.

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353393-MCR225A

TELESCOPING

31B−0800−011−0 8−11−0531B−0000−039−0 / 25� .POTAIN. 2002.


� By operating the hoisting motion, tighten the slings (3) slightly in order to come free from the lugs.

� Tighten the Tirfor (6) in order to keep the telescopic cage hard against the mast.

� Unscrew the removable cage panel (11), which is now hanging from the ”LUGAL” tackle (9).

� Move out the telescopic cage (12); for this, operate the slings (3) and the Tirfor (6) simultaneously.By gravity, the telescopic cage leaves the mast. If it is blocked, lift off at the level of the removablepanel (11).

� Free the telescopic cage (12) completely and lower it to the ground while operating the Tirfor (6).When the telescopic cage is placed onto the ground, release the hook of the Tirfor (6) fixed at (8) onthe cage (12), and lay down the Tirfor onto the ground.

� Rotate the slewing crane part half a turn in order to pick up the removable panel (11) by means of theload hook, then lower it and place it onto the ground.

� In order to prevent the telescopic cage from being damaged on the occasion of a possible transport,refit the front panel and bolt it.

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353393-MCR225A

TELESCOPING

31B−0800−011−0 8−11−0531B−0000−039−0 / 26� .POTAIN. 2002.


6. 2. REFITTING THE TELESCOPIC CAGE

If the telescopic cage must be reused for increasing the height or telescoping down anothercrane already erected, repeat the dismantling operations but in the reverse order, by observingthe safety instructions and the following order:

� Hook the fixed point (1) of the ”LUGAL” tackle (2) on a mast upright, raise the removable front panel(3) by means of the load hook and keep it in waiting position.

� On the ground, equip the telescopic cage (4) with its lateral catwalks and the rear catwalk whichpossibly had been dismantled for transport or handling reasons. Attach the mobile point (7) of theTirfor (8) onto the cylinder carrier beam; the Tirfor (8) remains in the meantime on one of the lateralcatwalks. Fix two slings (9) equipped with shackles (10) to the rear fishplates of the cage (4).

� Raise the telescopic cage (4) and fit it onto the mast. Fit the other end (11) of the Tirfor (8) to the mast.Rest the telescopic cage (4) onto the lugs by operating the Tirfor (8).

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353393-MCR225A

TELESCOPING

31B−0800−011−0 8−11−0531B−0000−039−0 / 27� .POTAIN. 2002.


� Bolt the removable front panel (3).

� Refit the front catwalk (12), the grab rail (13) and the two strut ties (14) and fix the assembly on thefront of the telescopic cage (4).

� Fit the telescoping accessories such as telescoping yoke, hydraulic cylinder and hydraulic unit.

� Remove the slings (9) equipped with shackles (10) used for raising the telescopic cage (4). Free theTirfor (8) as well as the ”LUGAL” tackle (2).

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353393-MCR225A

353393-MCR225A

31b telescoping 2

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