Ingersoll-Rand BMDLLN Series, User Manual

EN

45649027_ed2 

5

WARNING

Certain operations outlined in this section are very dangerous 

and could injure people if performed by unskilled personnel. 

Maintenance

The Balancer’s design is such that it is maintenance-free for its 

entire work life. But if it is used under particularly harsh conditions 

and requires any Maintenance, ensure that the spring-drum group 

(1) is unloaded before disassembling the Balancer.

The spring is a dangerous component. It is housed inside the 

drum (1) that is lubricated for life. The spring-drum spare part 

(1) is supplied complete: do not remove the spring for any reason 

whatsoever.

WARNING

Do not disassemble the spring group as this is a dangerous 

operation.

Replacing the cable

Discharge the drum spring.

Remove the stop ring 11 and the washer 12.

Hold bush 6 in place, using a 0-mm wrench, widen the spring 9 

and lift the spring and the bush and then remove the plate 4.

Remove screws ABC and loosen screw D by a few millimeters, 

raise flange E and replace the cable (15). Refit and tighten screws 

ABC and D. 

Reassembly

Repeat the foregoing operations in reverse order.

WARNING

Before you position the drum into the cover, check that the slot 

of cam 5 has been inserted into the matching pawl of lever 8 and 

that spring 7 is in place. For model Series BMDLLN pay attention 

to the position of the centrifugal masses X.

WARNING

In order to insert the drum into the cover, the cable must pass 

through the specific notch G in the flange F.

WARNING

After having inserted the bush 6 into the plate 4, insert it into 

the drum 13 by coupling the spring and then place everything 

inside the cover.

Hold bush 6 in place using a 30-mm wrench, widen the spring 

9 and then move down the bush 6 until it has entered the drum 

completely.

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WARNING

If the greater diameter of bush 6 does not lower until it touches 

plate 4, this means that bush 6 has not entered the drum’s 

support: stretch open spring 9 and oscillate the bush 6 until it is 

completely inserted.

Finish the assembly by inserting Washer 12 and Ring 11.

Drum spring Breakage

If the Balancer is locked, check that the drum’s spring is not 

completely discharged (this condition would trigger a locking as if 

the spring were broken); if you are unable to charge the Balancer 

complying with the procedure outlined in paragraph “Adjusting 

the Balancer”, this means that the drum’s spring is probably 

broken.

WARNING

Before carrying out any type of check, make sure the spring is 

discharged in actual fact.

DANGER

Never open the drum and/or attempt to replace the spring for 

any reason whatsoever. This operation is extremely dangerous 

and could cause very serious injury.

Carry out the procedure outlined in paragraph “Replacing the 

cable” to disassemble the Balancer and replace the entire drum 

(the spring is NOT supplied as a separate spare part).

DANGER

Dispose of the drum containing the broken spring as specified by 

prevailing laws and regulations. DO NOT abandon it or dispose

of it together with other types of waste and/or scrap because if it 

opens, even by accident, it is VERY DANGEROUS and could cause 

serious damage to anyone.

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NOTICE

This part of the manual is intended for maintenance personnel ONLY.

NOTICE

The use of other than Ingersoll Rand replacement parts may result in safety hazards, decreased performance and increased 

maintenance, and may invalidate all warranties. Repairs should be made only by authorized trained personnel. Consult your nearest 

Ingersoll Rand Authorized Service Centre.
When the life of the Balancer has expired, it should be returned to the nearest authorized Ingersoll Rand Service Center for 

dismantling and recycling.