Modulift MOD CLS User Instructions Download Page 3

User Instructions

Should you find your equipment is no longer of use, 
please dispose of in a responsible manner. Please 
contact Modulift if you need further guidance

© Copyright 2017 Modulift.  
All rights reserved.

MOD CLS

WARNING!

Never exceed the top or bottom clamp WLL

  

(see MOD CLS Specification).

Always remember to consider the weight of the lifting 

beam when checking the complete lifting arrangement.

For loads with an offset CoG, the clamp closest to the CoG 

will have the highest loading.  Remember the loading on 

each clamp will not be equally distributed.

Your lifting beam configuration will always depend on the 

number of lifting points required, as well as the stability and 

CoG position of the load.

For indeterminate lifts (i.e. more than 

2 bottom

 lifting 

clamps), always allow for the worst possible unequal load 

distribution on each clamp.

The MOD CLS is designed for a specific purpose and must 

not be used outside the limits stated within this document.

The MOD CLS beam clamps must not be used in combination 

with any other unauthorised equipment, either as individual 

components or as part of a third-party system.

If your lifting configuration is not shown in the below 

examples, or if you are in any doubt, please contact Modulift.

More than 2 bottom clamps

It is possible to use more than 2 bottom clamps underneath the 

beam for lifting loads with multiple lifting points. Please also 

note that for indeterminate lifts, it is much more likely for the 

load to be unequally distributed between each bottom clamp. 

If the load is not equally distributed between each bottom 

clamp, always ensure the unequal loading does not exceed 

each bottom clamp WLL.  Also ensure that the total load does 

not exceed the two top clamps WLL and beam WLL (as shown 

in 

Table 3

). Always fit at least one 

red safety stop

 to each 

clamp and tighten bolt to a torque of 30 lbf.ft prior to any lift.
Using 

Table 3

 for more than 2 bottom clamps (i.e. for lifting 

arrangements equivalent to 

Fig. 7a

 and 

Fig. 7b

 below), the 

worst-case load regarding the bottom span B shall be used 

when checking the beam SWL value. 

Red safety stops

 are 

shown in three possible arrangements, depending on clamp 

position and lifting beam hole location.

Load offset CoG vs tilt

In order to prevent tilt for lifting configurations with an offset 

CoG, the CoG of the load must sit vertically under the crane 

hook. For the beam not to tilt when lifted unloaded, the centre 

of the beam needs to sit vertically under the crane hook. To 

avoid the load and the beam (either loaded or unloaded) from 

tilting, always ensure the top lugs are equally spaced from the 

centre of the beam. Adjust the location of the bottom clamps 

so that 

both

 the CoG of the load and the CoG of the beam sits 

vertically under the hook (as shown in 

Fig. 8

 and 

Fig. 9

 below). 

Please note for a lifting beam configuration (

Fig. 8

 single top 

lug), if it is not possible to fit a 

red safety stop

 between the top 

clamp collar plates (as shown), fit two 

red safety stops

 to the 

nearest beam hole on either side of the top clamp.

The following two pages are intended  

to provide clear instruction for  correct 

usage of the MOD CLS in other common 

lifting scenarios. If your lifting configuration 

is not shown, or if you are in any doubt, 

contact Modulift for further assistance

For offset CoG loads, the clamp closest to the CoG will be 

loaded higher. As loads on the clamps will not be equally 

distributed, always ensure the unequal loading does not 

exceed each bottom clamp WLL.

Note:

 If the Beam section is not long enough and the bottom 

clamps cannot be moved further to accommodate the CoG 

offset, then to accommodate the offset CoG of the load – 

please adjust the top clamp position. 

Always ensure that 

all lug plates are being pulled vertically or towards the 

body of the clamp

 (loaded or unloaded) as shown in 

Fig.10a

Increasing the height of the top slings will reduce the tilt. 

Never allow the beam to tilt more than 6 degrees from  

the horizontal plane.

MOD CLS

MOD CLS US JULY 2017

Fig. 8 – Lifting beam 
(single top lug) and 
load with offset CoG

Fig. 9: Semi-Spreader 
(two top lugs) and 
load with offset CoG

B

1

B

2

Fig. 7b – Using B

1

  

and B

2

 the lowest  

SWL shall be applied

B

1

B

2

 = 0

Fig. 7a – Using B

1

 and B

2

  

the lowest SWL shall  

be applied

Modulift UK Ltd

 

tel:

 011 44 1202 621511 

email:

 sales@modulift.com 

www.modulift.com

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