SQ5ZA3T Marine Crane Fitted on a River Vessel in Russia

A yellow knuckle boom crane, still wrapped in plastic film, bolted to its pedestal on the green deck of a vessel at a river shipyard: two photos from our customer in Russia show a BOB-LIFT SQ5ZA3T knuckle boom marine crane just after it was fitted.

At a glance: SQ5ZA3T 5 t knuckle boom marine crane · Russia · vessel at a river shipyard · 2 customer photos.

What the photos show

• On the pedestal. The folded crane stands on a yellow pedestal at the edge of the deck, next to a railing with wire ropes. The bolts around the base plate are already in place.
• Still wrapped. Plastic film and bubble wrap still cover the boom and the column. The boom is marked SQ5Z.
• Fitting-out work. Cables and hoses run across the deck to a work light on a tripod. Steel plates for a hatch cover lie on the deck, with a cutting disc on top.
• The river. Behind the vessel, a wide river runs past green trees under a clear sky.

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

SQ5ZA3T specifications

The SQ5ZA3T is a 5 t knuckle boom marine crane with a maximum lifting moment of 10.5 t·m. All figures are read from the technical department's 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, the SQ5ZA3T lifts 5,000 kg at 2.1 m but only 1,100 kg at 8.05 m. 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.

At 4.45 m from the slewing centre the crane is rated for 2,350 kg; at 6.2 m it is 1,600 kg. Folded, it is 2,321 mm long, 2,261 mm high and 712 mm wide, so it takes little room at the deck edge.

The SQ5ZA3T product page has the full drawings, and other models of this size are on the 5 t knuckle boom marine crane page. The same model is fitted on new work boats in our delivery record from Egypt, and it works on a river boat in our record from Bangladesh.

From fitting to the first lift

The photos show the crane just after fitting, before the wrapping comes off. Four points to check before it goes to work:

1. Check the pedestal welds and bolts. The 680 × 680 mm base plate with 24 bolts must sit on a pedestal welded into the deck structure and sized for the full 10.5 t·m moment. Tighten the bolts to the torque in the manual.
2. Unwrap fully before the first start. Remove all film from the boom, the cylinders and the controls, so that nothing jams in a joint or hides a leak.
3. Connect and test the hydraulics. The SQ5ZA3T needs 35 L/min at 28 MPa, about 22 kW. Fill the 100 L tank, then fold, unfold and slew the crane without a load and check every fitting.
4. Keep the deck edge clear. The crane stands next to the railing. Mark the slewing area and keep cables and people out from under the boom.

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

What to send us for a marine crane

To check a crane like the SQ5ZA3T for your vessel, 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. The SQ5ZA3T needs 35 L/min at 28 MPa, about 22 kW.

Send these through the contact page, and our team will check reach and load against the chart.

Record compiled by Achord Chan, Product Operations Director at BOB-LIFT, from the customer's photos and the technical department's drawings.