This is the 8 tonne Terex tower crane in a series of flat top tower cranes that range from 1.5 tonne to 40 tonne. The CTT 162 is set up with maximum jib length of 65 meters and can lift 1.5 tonnes at max radius. I believe the cut out limits have been set up too high on this crane as it doesnt lift what it should be able to according to the load chart.
Previously we have reviewed the 5 tonne Terex CTT121. This crane suffers from the same main problem as the 5 tonne crane in the range which is reliability.
Ill go through all the issues I have with this crane, they are as follows
Weak slew motors- The slew motors could be bigger. It takes a while to build up speed slewing and a lot to slow down. Made even worse by the fact that backslewing on this crane does absolutly nothing. If you overslew, the crane wont let you slew back until slew has come to a compete stop and rested. And wind really affects the slewing, if you have a tail wind the slew will take so much longer to pull up, you really have to keep an eye not just on wind speed but also wind direction.
Play in slew brake- When the slew brake is engaged the cranes jib has a bit of movement, when windy the jib rocks back and forth when locked, requiring the operator to keep catching swing even when crane is stationary.
Slew brake engagement- The slew brake isnt wired up to thumb buttons on this cranes levers but on a button to the left of the slew/trolley level. To engage the slew brake requires taking the hand off the lever completly or waiting for the slew brake to automatically engage. When operating in windy conditions this is a problem.
Radius on control pannel- For some reason the radius reading is not 100% accurate. On a known spot the radius reading can change by 1.5 meters. Not a big deal but just remember you cannot reley 100% on the radius given to you on the display.
Small cramped cabin- Wow the cabin is tiny. Im not that tall and it is cramped in there. Getting past the chair to sit down or get out is awkward, requiring swivelling of the chair and squeezing through. The air con is average and noisy. Although in wither the plus is that it has a great heater. I much prefer to be on the ground dogging this crane than being cramped up in the cabin all day.
Unreliable- The tower crane is only 6 years old yet it seems every month we have to get the rental company out to fix something on the crane. We have had problems with the hoist motor failing, the way cable spools on the drum and the trolley so far.
Hoist speed could be faster- For this job which is only 6 storeys high the hoist speed is fine but on something higher the crane would let you down.
Trolley cuts out when overloaded- If you reach 100% capacity not only will the tower crane not hoist up but trolley is completly disabled. Even after taking the weight off the crane trolley is still disabled, requiring you to reset the crane (turn off then on). Most tower cranes will allow trolley in when overloaded, allowing the operator to trolley in and increase the working load limit and then hook up. The way this crane works with the trolley cut out is a nusance.
This is not the worst 8 tonne tower crane I have experienced, but it is still below average. There are better tower cranes out there and if possible go with something else, especially if you cannot afford downtime due to this cranes unreliability. Ill give this crane 2 out of 5 stars!
The lifting chains on the crane can become stretched by shock loading, lifting beyond the chains capacity and uneven weight distribution from load to chains causing overloading.
A bit of stretch in the chain is ok but once you get to 10% stretching in a single link the chains must be taken out of service and replaced.
For example if a link that is 30mm long when new and is now 33mm long or more that chains must be replaced, below 33mm is ok but keep on checking regularly especially if they have started to stretch.
You can see stretched chains straight away because 99% of the time they dont stretch evenly.
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