SQ5ZA3 Knuckle Crane Bench Test in Fiji

A yellow SQ5ZA3 knuckle boom crane bolted to steel beams on a workshop floor: a photo and a short video from our customer in Fiji show the crane being tested on a stand before it goes onto a truck, with the booms unfolding and folding again.

At a glance: SQ5ZA3 5 t knuckle boom crane · Fiji · bench test before mounting · 1 customer photo and 1 video.

What the photo and video show

• On the test stand. The folded crane sits on two steel beams in a large industrial shop. The BOB-LIFT and SQ5Z markings are on the boom, along with a 'No standing under the boom' warning, and the yellow oil tank is fixed beside the column.
• Base and outriggers. The crane base, with both outrigger beams and the control valve bank on the side, rests directly on the beams with no truck underneath.
• Unfolding. In the 20-second video the booms open out from the folded position and swing back, while workers watch from beside the base. Heavy blue machinery fills the shop behind.

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

SQ5ZA3 specifications

The SQ5ZA3 is a 5 t knuckle boom truck-mounted crane with a maximum lifting moment of 10.5 t·m and three boom sections. All figures below 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 SQ5ZA3 lifts 5,000 kg at 2.1 m but only 1,100 kg at 8.05 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 5,000 kg is rated at 2.1 m, falling to 2,350 kg at 4.45 m and 1,100 kg at the full 8.05 m reach.

The SQ5ZA3 product page has the dimension drawing and the full specification. The same model, fitted to a red light truck and lifting a wheel, is in our delivery record from Indonesia.

Testing a crane before it goes on the truck

Running the crane on a stand lets the workshop find hydraulic or wiring faults while every part is still easy to reach. Three checks worth making at this stage:

1. Hydraulic supply. The crane is specified for 35 L/min at 28 MPa, about 22 kW. Run it from a power pack or pump that matches, and check every function moves smoothly with no leaks.
2. Base fixing. The crane weighs 2,286 kg. Bolt the base firmly to the stand before unfolding, because the booms move the centre of gravity well outside the base.
3. Space behind the cab. The SQ5ZA3 needs 1,050 mm behind the cab and outriggers that span 2,272 to 5,122 mm. Measure the chassis before the crane leaves the stand.

Keep people clear of the booms while they move, as the warning on the crane says, and do not test lift loads until the crane is mounted with its outriggers set. How we fit cranes to customer chassis is on the mounting and shipping page, and other capacities are in the knuckle boom truck mounted crane range.

Checking a truck for the SQ5ZA3

Before you order, check three things on your truck. They decide whether the SQ5ZA3 fits it.

• Payload. The crane weighs 2,286 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 35 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 span 2,272 to 5,122 mm. 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 photo and video and the technical department's drawings.