SQ08ZA3T+1 Small Marine Crane on a Work Boat in Spain

A small white knuckle boom crane with a winch on the stern deck of a work boat, moored below a harbour quay: a photo and a video from our customer in Spain show a BOB-LIFT SQ08ZA3T+1 knuckle boom marine crane on a small boat.

At a glance: SQ08ZA3T+1 0.8 t knuckle boom marine crane · Spain · small work boat in a harbour · 1 customer photo and 1 video.

What the photo and video show

• On deck. Seen from the quay, the folded crane stands on the stern deck between an open hatch and white plastic tubs, with buckets and hoses around it.
• The crane. The white boom is marked BOB-LIFT and SQ08Z, with a NO STANDING UNDER THE BOOM warning. A dark blue extension boom slides out of it, and a winch drum with wire rope is mounted on the boom.
• The test. In the video the boom is raised and extended next to the quay wall. One man holds the red hook on a rope, while others watch from the quay above.

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

SQ08ZA3T+1 specifications

The SQ08ZA3T+1 is a 0.8 t knuckle boom marine crane with a maximum lifting moment of 1.3 t·m and one extension boom. 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 SQ08ZA3T+1 lifts 800 kg at 1.34 m but only 220 kg at 4.15 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 2.25 m from the slewing centre the crane is rated for 450 kg; at 3.23 m it is 300 kg. Folded, it is only 356 mm wide, so it fits beside a hatch on a small deck.

The SQ08ZA3T+1 product page has the full drawings, and other models of this size are on the 0.8 t knuckle boom marine crane page. The truck version of this crane works in our delivery record from Canada, and a 5 t marine crane with a winch works on a river boat in our record from Bangladesh.

A small crane on a small boat

A 200 kg crane fits boats that have no room for a large one, but its limits are tight. Four points to plan for:

1. Mind the 330° slewing range. The crane does not turn a full circle. Place it so the stop falls where you never need to lift, such as over the wheelhouse.
2. Keep loads light at reach. The crane lifts 800 kg close in but only 220 kg at 4.15 m. Weigh nets, pots or equipment before you lift them over the side.
3. Size the hydraulic supply. The SQ08ZA3T+1 needs only 8 L/min at 18 MPa, about 3.5 kW, so a small pump on the boat engine can drive it.
4. Stow the boom before leaving harbour. Fold the boom, hook the block and secure it, so it cannot swing in a swell.

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 SQ08ZA3T+1 for your boat, 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 SQ08ZA3T+1 needs 8 L/min at 18 MPa, about 3.5 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 photo and video and the technical department's drawing.