If you don't do the tower cranes weekly service...
The weekly service is done to reduce wear and tear and ensure that there is nothing loose or broken on the crane. Apart from the visual inspections you have to grease the hoist rope, trolly and slew gears. Its not a particularly hard job and shouldn't take more than 30 mins on the typical crane.
The following is required for the weekly check
Grease slewing ring and lubricate open gears
With the grease gun apply grease to the grease nipples for the slew ring, if no nipples apply directly to the gears
Visual check of slewing ring bolts
The slew ring bolts usually have a line that has been marked across them and onto the crane, this allows for easy identification of movement of the bolts
Oil levels of luff checked
On a luffing crane check the oil level on the luff motor, there is usually a clear circle that allows you to see the oil level without opening anything
Oil levels of hoist checked
Check the oil levels on the hoist motor, there is usually a clear circle that allows you to see the oil level without opening anything
Oil levels of travel gearbox checked
Check the oil levels on the travel motor, there is usually a clear circle that allows you to see the oil level without opening anything
Oil level of luff/hoist secondary brake
Check the oil levels on secondary brake, there is usually a clear circle that allows you to see the oil level without opening anything
Weekly load test of a known weight
This is done by picking up a know weight and checking the weigh on your gauges to ensure the crane is still correctly calibrated
Weekly moment test
Testing the bending moments, this is done by picking up a load and carrying it out to 100% capacity. The crane will bend and set off the alarm, if the alarm does not go off you might have problems. This is caused by the moment plates not being in the correct position or being tampered with.
Crane base area is clean, tidy and free from water
Keeping the base clean and free from water helps reduce the risk of slip and falls
The area around slew ring and counter jib are free from debris and any loose items are secured
You should not have anything sitting on the crane that can come free, its usually a long way up and its bad for objects to fall on people
Check the reeving system (2/4)
Change the reeving from 2 part to 4 part and check the hoist rope is traveling properly through that reeving system
Check structure and waterproofing of electrical cabinets
Make sure the cabinets are locked, there is an unbelievable amount of stuff in those electrical cabinets, take my word for it
Fire extinguisher present and current
You should have one in your cabin, usually a nice small dry powder firey
Ensure ropes are sufficiently greased
With the grease gun apply grease to the grease nipples for the hoist drum and trolly drum, if no nipples apply directly to the rope on the drum. If you are having trouble reaching the lower lay of cable change the reeving from 2 part to 4 part then lower the hook, this will use up more hoist rope and get you deeper into the drum. This is very important, if this is neglected the ropes will rub against each other without grease and fray
Inspect generator is free from damage
This applies to diesel cranes, if you are on a non luffing crane your not likely to have a generator but if you do... inspect it
Visual inspection of connecting pins of upper structure
Check the pins, I have had a tower crane that had pins move, the crane had quite a lot of deflection and I suppose all the movement caused them to loosen
Visual inspection of the power board
Just visually check the fuses are all at the on position DONT TOUCH ANYTHING there are wires and plugs everywhere and the only person who will be able to make sense of it is a crane electrician familiar with that crane so dont give yourself troubles, look don't touch!
The isolator is the on/off switch, you should be using this everyday and know if it works or not
Missed an article?
Type what you are looking for in the search bar or click on the archives