Today I review the 6t Liebherr 100 LC tower crane, the crane was set up with the max jib size of 50 meters, max tower height is 44 meters
The first thing I noticed with this crane is its size. Its only a 6t crane but it looks like a 12t. The large size makes the crane extremely stable. The tower doesn't twist no matter how fast you stop slewing. Deflection is minimal for this size of crane and at 50m it can lift a reasonable 1.6t (unlike other brands that claim it can lift a certain amount and fall short the Liebherr can do what it says)
The hoist speed is pretty good. It will beat just about every other crane on hoist speed that's 8t and below
The wind pushes the jib around real easy so you have to keep an eye on the jib if operating by remote, but it has a great slew brake. The slew motors don't decelerate like other tower cranes. With the Liebherr driving is different, you slew, reach desired slew speed (this happens quite quick, it has good slew motors) and just let the crane glide along. To slow down and stop you just back slew, there's no letting it glide to a stop. It takes a little while to get used to but when you do you don't want to operate anything else. Dogman says stop slew, backslew, jib stops completely.... Its that easy.
Just don't forget to apply the slew brake as soon as possible because even with hardly any breeze the jib will move.
No matter how hard you back slew it doesn't faze this crane, the jib wont bend and shake and the tower wont twist.
The remote is something else. Its huge, way bigger than the big Hetronic remotes you get with Potain cranes. The levers make it feel like you are operating a crane not a remote control car. It even has a thumb button on the hoist lever to give micro hoist speed - just like the cabin controls. Some crane operators will whinge about having to carry around a remote the size of a large infant... Bad luck for them!
The only disappointment on this crane was the cabin. It was small, real small. Room for a seat and the controls and that's it. Access to the cabin is via the roof, you pretty much drop into your little seat.
Believe the hype, 4.5 out of 5
The easiest crane to operate ever!
The Terex CTT 121 is a 5 tonne flat top tower crane.
Most of the ones around Sydney are rentals from Active Crane Hire.
Active also rent out the small Potain cranes, I much prefer the Potain crane. In my experience I have found every Potain to be very reliable, im yet to have work stop because of crane breakdown with this brand. Yet every site im on with a Terex there is usually something going wrong that will put the crane out of action, maybe I've just been unlucky but they just are not as reliable as other brands.
The hoist speed isnt too bad for a 5t crane, with a 5t crane you are never going to get anything super fast. It does 5t max lift in 4 part but you probably want to use it mainly in 2 part with max lift of 2.5t. Changing from 4 to 2 and back is pretty easy as you can see in this previous changing the reeving blog post.
The CTT tower crane range all have a nice slow 1st speed trolley, making small movements easy. If you are walking a slung up load 1st speed trolley may even be a little slow. The trolley doesnt come to a complete sudden stop when you stop the trolley, rather it slows down then stops, this reduces trolley swing, making the crane easier to operate.
Backslew is non existent, it does next to nothing. Not too big a problem on a small crane but the bigger CTT cranes also have this issue and this is where it is more of a problem.
Putting the crane into free slew is easy. Just press a button on the remote and it goes straight into free slew.
When overloaded the trolley cuts out and gives 'trolley error'. You wont be able to use the trolley at all, even trolley in is disabled until you turn off the remote, turn it on and wait for the crane to start up again. Most other tower crane will still allow you to trolley in and hoist down, allowing you to either trolley in to where it is within weight capacity or lower to load back to the ground.
If you are getting a 5t tower crane through Active Hire you only have the choice of the Terex and Potain, go with the potain. Performance wise they are both similar but the Terex reliability lets it down, making it the inferior crane. I also prefer the feel of the Potain, they are just a bit more enjoyable to operate.
The Terex CTT 121 gets 3 out of 5
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