SQ6.3ZA4 Knuckle Boom Crane on a Tray Truck in Australia

A black crane folded behind the cab of a long tray truck, parked among gum trees: photos from our customer in Australia show a BOB-LIFT SQ6.3ZA4 knuckle boom crane mounted on a tandem-axle tray truck.

At a glance: SQ6.3ZA4 6.3 t knuckle boom crane · Australia · tandem-axle tray truck · 3 customer photos.

What the photos show

• The truck. A white cab-over truck with two rear axles carries a long flat tray. The tray has a checker-plate floor, black stakes along the sides and red-and-white markers at the rear.
• The crane. The black crane, marked SQ6.3, is folded upright behind the cab, with a red hook at the top.
• The headboard. A white steel headboard with mesh panels stands between the crane and the tray. Two black boxes sit on the tray just behind it.
• The site. The truck stands on a dirt yard among eucalyptus trees, with cables, hoses and parts on the ground and a shipping container behind it.

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

SQ6.3ZA4 specifications

The SQ6.3ZA4 is a 6.3 t knuckle boom truck-mounted crane with a maximum lifting moment of 13.2 t·m. 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 SQ6.3ZA4 lifts 6,300 kg at 2.1 m but only 1,190 kg at 10.2 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.

At 6.3 m from the slewing centre the crane is rated for 2,020 kg; at the full 10.2 m reach it is 1,190 kg.

The SQ6.3ZA4 is now a previous model. In the same 6.3 t class we currently build the SQ6.3ZA5 and the BLZ129K4. The SQ6.3ZA4 page compares all three and shows the full drawings. The same model sets concrete poles in our delivery record from Honduras, handles steel coils in our record from Mexico, and is lifted onto a chassis in our record from El Salvador.

A 6.3 t crane on a long tray truck

Mounted behind the cab, the crane loads and unloads the whole length of the tray. The far end of a long tray is a long way from the column, so the plan starts with the load chart. Four things to plan for:

1. Reach to the back of the tray. The rating drops as loads move back: 2,020 kg at 6.3 m, 1,500 kg at 8.3 m and 1,190 kg at 10.2 m. Load the heaviest items near the front.
2. A headboard between crane and load. A strong headboard, like the one in the photos, keeps a shifting load off the crane and the cab when the truck brakes.
3. Outriggers on loose ground. A dirt yard can be soft under one foot and hard under another. Use pads under the outrigger feet and level the truck before lifting.
4. Axle loads. The crane weighs 2,180 kg and sits just behind the cab. Check the front axle load with the crane fitted and the tray empty, as well as fully loaded.

How we fit cranes to customer chassis is on the mounting and shipping page. Other capacities are in the knuckle boom truck mounted crane range.

Checking a truck for the SQ6.3ZA4

Before you order, check three things on your truck. They decide whether the SQ6.3ZA4 fits it.

• Payload. The crane weighs 2,180 kg. Take this off the truck's payload, then plan the body and the loads you carry with what is left.
• Hydraulic power. The crane needs 40 L/min at 28 MPa, about 22 kW. The power take-off and pump on your truck must give at least this.
• Outrigger room. The outriggers need room to extend fully. Make sure the frame has room for them, and that your job sites do too.

Send us the make, model and wheelbase of your truck through the contact page, and our team will check the fit.

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.