SQ20ZA4T Marine Crane Test Run for Kazakhstan

A new orange knuckle boom crane on a ribbed pedestal in a large workshop hall, unfolding its boom and slewing under the roof lights: videos from our customer in Kazakhstan show a BOB-LIFT SQ20ZA4T marine crane during a test run indoors.

At a glance: SQ20ZA4T 20 t knuckle boom marine crane · Kazakhstan · test run in a workshop · 6 customer videos.

What the videos show

• The pedestal. Close-ups show the ribbed orange pedestal, the black slewing ring and the ring of bolts that holds the column.
• The cylinders. The camera follows the black lift cylinders and hoses along the boom and stops on a fresh orange cover plate.
• The test. In four videos the crane unfolds its boom, raises and lowers it and slews, with a red hook hanging from the tip. An operator stands at the controls on the column.
• The hall. A steel roof frame, machine tools and other equipment fill the background.

These are the customer's own videos. No load weights or comments came with them.

About the SQ20ZA4T

The SQ20ZA4T is an earlier 20 t knuckle boom marine crane. It is no longer in the current range, and the technical department has no current drawing for it, so this record does not quote load figures for it. For a new crane of this size, see the 20 t knuckle boom marine crane page, where each current model has its own dimension and load chart drawings.

Lifting moment is the load times its distance from the slewing centre. That is why the rated load drops as the boom reaches out. For example, a load the crane lifts easily close to the column can be too heavy once the extension is pushed out. Working radius is the level distance from the slewing centre to the hook. On a vessel or a quay, the pedestal takes the place of outriggers. It must be strong enough for the crane's weight and its full lifting moment. For general crane safety rules, see the OSHA cranes and derricks standard.

Running every motion on the ground, before the crane goes on board, shows leaks and control faults while they are still easy to reach. A 20 t telescopic marine crane works in our delivery record from New Zealand, and a 12 t marine crane works in a stone workshop in our record from Germany.

What to check in a no-load test run

A test run with no load is the first check on a new crane. Four points to plan for:

1. Run every function. Take each boom section, the extensions and the slewing through their full travel, slowly at first.
2. Look for leaks. Check every hose joint, valve and cylinder seal while the crane works and after it stops.
3. Check the controls. Each lever should move the right motion smoothly and return to neutral when released.
4. Test with a known weight. After the no-load run, lift a known weight at a short radius before the first real job.

Sea water is hard on steel, so the marine cranes get an epoxy zinc primer with a polyurethane acrylic top coat. Other sizes are in the knuckle boom marine crane range, and the marine crane buying guide covers pedestal mounting in more detail.

What to send us for a marine crane

To match a current crane to your vessel or quay, we need a few details. Short answers are fine.

• The site. The vessel type and length, or the quay, and where the crane will stand.
• The lifts. The heaviest load, and how far from the crane it is picked up and set down.
• The power. The hydraulic power pack you have now, or whether you need a new one.

If you run an SQ20ZA4T today, a photo of its nameplate helps too. Send these through the contact page, and our team will check reach and load against the current load charts.

Record compiled by Achord Chan, Product Operations Director at BOB-LIFT, from the customer's videos.