SQ08ZA3+1 800 kg Crane on a Trailer in Australia

Not every crane goes on a truck. Ten photos from our customer in Australia show a BOB-LIFT SQ08ZA3+1 knuckle boom crane on a trailer. The 800 kg crane is built into the front of a galvanised tandem-axle trailer. It is finished in a workshop and ready to tow.

At a glance: SQ08ZA3+1 800 kg knuckle boom crane · Australia · trailer-mounted build · 10 customer photos.

The trailer build in Australia

• Where the crane sits. The crane stands on a raised chequer-plate plinth at the front of the tray, just behind the drawbar. A lidded chequer-plate box sits ahead of it on the drawbar side. The photos do not show what the box holds.
• The trailer. The trailer has a galvanised tray with low sides, two axles and a jockey wheel and safety chains on the drawbar. A spare wheel lies in the tray.
• Stabiliser legs. Two yellow stabiliser legs are fitted beside the crane base, one on each side of the trailer.
• Folded for towing. In the workshop photos the boom is folded upright, with the hook hanging inside the tray.
• Before fitting. One photo, taken in a large factory hall, shows the crane and its base frame hanging from an overhead chain hoist.

Photos supplied by the customer. Load weights and dates were not recorded with them.

SQ08ZA3+1 specifications

The SQ08ZA3+1 is an 800 kg knuckle boom crane with a maximum lifting moment of 1.3 t·m. The "+1" marks one extra boom section on top of the three-section SQ08ZA3. Reach and load figures are read from the technical department's load chart drawing; the hydraulic figures come from the BOB-LIFT brochure.

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 SQ08ZA3+1 lifts 800 kg at 1.34 m but only 220 kg at 4.15 m. Outrigger span is the width between the outrigger feet when they are fully out. Set them on firm, level ground, such as concrete or compacted gravel, before each lift. For ground and outrigger rules, see the OSHA cranes and derricks standard.

The full 800 kg is rated only close to the column, at 1.34 m. At the far end of a trailer tray, around 3.2 m away, the rating is 300 kg.

The SQ08ZA3+1 product page has the full drawings. The three-section SQ08ZA3 is lighter at 280 kg.

Putting a small crane on a trailer

A trailer build lets one crane serve several vehicles. Unhitch the trailer at the job, and the towing vehicle is free for other work. The build in these photos shows the parts that matter:

1. A stiff mounting point. The crane base needs a plinth or frame that takes its slewing moment into the trailer chassis, not just into the tray floor.
2. Stabilisers on both sides. A light trailer tips far more easily than a truck. Put the legs down before the boom swings out to the side.
3. A hydraulic power supply. The crane needs about 8 L/min at 18 MPa. A trailer has no truck PTO, so the power source has to be planned as part of the build.
4. Weight and balance. The 330 kg crane sits near the drawbar, so check the ball weight and the trailer's rated load before adding cargo.

Other light cranes are in the pickup crane range, and every model up to about 1 t is listed on the 1 ton crane page.

What to send us for a trailer build

To check a crane like the SQ08ZA3+1 for your trailer, we need a few details. Short answers are fine.

• The trailer. Its rated load, its tray size and the number of axles.
• 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.

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, the technical department's drawing and the BOB-LIFT brochure.