Mobile 3 Potential Problems Flashcards
How must the rope on drums be wound
Tightly and evenly
What can occur if rope is not wound correctly
Severe rope damage
Name 9 common causes of poor drum winding and slack rope
Rope incorrectly installed on drum
Incorrect fleet angle
Rope to stiff for drum
Sheaves poorly lubricated or stiff from cold
Effect of wind on hoist line
Suddenly stopping a load during hoisting
Block or ball too light
Sudden change in rope tension
Overlowering
Give a brief description of how to determine the correct Anchorage for rope on the drum
Find out if it’s over wound or under-wound
Find out if it’s left or right lay and use corresponding hand index out palm facing you for over wound and palm facing away for under wound
Extended finger always points to correct flange
Give the fleet angle not to be exceeded on a grooves drum and the ratio
2 degrees
30:1
Give the fleet angle not to be exceeded on a smooth drum and the ratio
- 5 degrees
40: 1
Name two possible solutions for rope that is too stiff
Would need a larger diameter drum
Get more supple rope
How do you prevent problems from sheaves being to stiff or cold
Boom down and inspect all sheaves thoroughly
Try to warm up sheaves in cold weather by running line up and down slowly
What can be caused by suddenly stopping the load as it’s being hoisted and how would you prevent this
Cause the load to jump which will cause slack in the line which in turn could loosen the wraps on the drum
Take care when Hoisting to keep consistent and smooth operation
What common occurrence could prevent the rope from staying taught
Hook or headache ball to light
Ensure both are heavy enough for length of boom rope type and crane configuration
Give two examples that could cause a sudden change in rope tension, resulting in slack rope momentarily which could cause loose coils on the drum or cross coiling
Lifting a load out of ice
Lifting a cut off portion of steel where the slag has re glued
What else can cause the same effect in rope tension besides a load in ice or fresh cut steel and how do you prevent it
Overlowering the load
Slow down as you deposit load
Keep block and ball from touching ground
What are 6 things to keep in mind when the temperature drops below freezing
Avoid maximum capacity lifts
Slow down cycle of operation
Do not dynamic or shock load any components
Proper hydraulic system warm up
Slow smooth infrequent lifting only if necessary
Lifting as per manufactures charts
What would tell you the proper distance to maintain from power lines and where would you find it
Table 4 in z-150
When would need to use a signal person or work area definition person ona site with power lines
If any part of the crane or load encroaches on the MSAD
What six things is a site supervisor responsible for regarding power lines
Provide qualified signalman
Be aware of the requirements of electrical authority
If travel will be repeated then route will be marked with rider poles
Ensure the crane grounded where necessary
Report every incident involving contact to site safety inspector
Not use crane until it has been inspected by competent person
What is the general MSAD from power lines
7 metres
Name five steps to take in the event of contact with a power line
Do not panic
Remain in cab if feasible
Instruct all personnel to stay away
Try unaided with no one near to back of crane so it is clear of power line
If the machine can not get away or disentangled remain in the machine until things are de energized and safety is confirmed by electrical authority
Be aware when working near transmitters the boom and load can become electrically charged.
What is the best way to prevent this and what should an operator wear getting on and off the crane
Synthetic sling between block and load
Rubber gloves
Give 8 ways a lattice boom may collapse backwards
Boom angle higher than permitted
Sudden forward movement when at high boom angle
Hook block tied back and pulled to tight
Sudden release of load
High wind on front of boom
Two blocking
Swinging from downhill to up hill side
Starting or stopping swing suddenly
What would be malfunction on a lattice boom if you boomed up higher than permitted
Boom kick out not working
Boom stops not set properly
How does releasing a load suddenly cause backwards tip over
Boom deflection and stretching pendants will spring back
How far must your crane be from MSAD
one full boom length
Where is a boom at its strongest
A high angle
