The SQ4ZA4 is a 4 ton knuckle boom truck crane. It lifts 4,000 kg at 2.1 m, 1,750 kg at 4.35 m and 600 kg at its full 9.4 m reach, with an 8.4 t·m maximum lifting moment and 400° slewing. The crane itself weighs 1,460 kg and needs 850 mm of space behind the cab.
What the 4 ton SQ4ZA4 is built for
The SQ4ZA4 folds its four-section boom into a compact package behind the cab: stowed, it stands 2,040 mm high, and at 1,460 kg it leaves most of a light or medium truck’s payload for cargo. Unfolded, the knuckle joint lets the boom reach over a wall, a fence or a stack of pallets and set the load down at a low angle, then fold back without blocking the bed. That suits builders’ merchants delivering blocks, bagged cement and roof tiles, landscapers moving stone and plants, and maintenance crews lifting pumps, generators and small machinery. Raised to 75°, the hook reaches about 11 m.
Rated capacity always depends on radius. At 5.9 m the SQ4ZA4 lifts 1,250 kg and at 7.7 m it lifts 850 kg, so check the weight of your heaviest regular load at the distance you need before you choose a tonnage. If you prefer a straight boom, the 4 ton telescopic boom crane is in the same class; for more capacity, step up to the 5 ton knuckle boom crane.
Load at each radius
| 2.1 m |
4,000 kg |
| 4.35 m |
1,750 kg |
| 5.9 m |
1,250 kg |
| 7.7 m |
850 kg |
| 9.4 m |
600 kg |
Figures from the SQ4ZA4 load chart with the boom horizontal. Do not lift more than the chart shows at your working radius. Download the SQ4ZA4 load chart (PDF)
Mounting it on your truck
The SQ4ZA4 mounts on a truck chassis behind the cab. These are the figures your body builder needs from the dimension drawing:
| Installation space behind the cab |
850 mm |
| Outrigger span |
2,250–3,513 mm |
| Width of the crane base |
2,450 mm |
| Height of the crane when stowed |
2,040 mm |
| Hydraulic supply |
25 L/min at 26 MPa, about 14 kW |
| Oil tank |
60 L |
Send us your truck make, model and wheelbase, and we check that the chassis and power take-off suit the crane before you order. Download the SQ4ZA4 dimension drawing (PDF)
All knuckle boom truck cranes · How to choose a knuckle boom crane
Optional attachments
- Hydraulic gripper opened and closed by its own cylinder to grab and release loads.
- Clamshell bucket for loading, unloading and light digging of waste, chippings and soil.
- Orange peel grab for scrap and bulk material.
- Timber grapple for logs and timber.
- Auger for tree-planting holes, utility poles, foundation piles and soil sampling.
Certification
The SQ4Z series holds a CE certificate of conformity under the EU Machinery Directive 2006/42/EC.
Choosing the right model
Need more than 4 t? The next class up is the BLZ90K5 at 4.6 t. For lighter loads, the SQ3.2ZA3 at 3.2 t is the class below.
Before ordering, check that the truck's power take-off can deliver 25 L/min at 26 MPa. We recommend 14 kW of hydraulic power. Its self weight of 1460 kg adds to the load on the truck, so allow for it in the payload.
