SQ20ZA7+1 Knuckle Boom Crane with a Raised Cab in Türkiye

A black knuckle boom crane with a yellow operator cab high on its column, mounted behind the cab of a white three-axle flatbed truck and lifting a long teal pipe upright on a hillside site: photos from our customer in Türkiye show a BOB-LIFT SQ20ZA7+1 knuckle boom truck-mounted crane at work.

At a glance: SQ20ZA7+1 20 t knuckle boom truck-mounted crane · Türkiye · flatbed truck with raised crane cab · 9 customer photos.

What the photos show

• The truck. The crane stands behind the cab of a white truck with two rear axles and a flatbed with yellow side rails. A red hook hangs from the folded boom.
• The crane cab. A yellow cab with large windows sits on top of the crane column, so the operator rides up with the crane and looks down on the load.
• Lifting pipes. In two scenes the boom stands almost upright and holds a long teal pipe on end beside the truck, with an outrigger set down on the ground. A cut rock face and green hills rise behind.
• At a dam site. Two photos show the truck parked on a lower level beside new concrete walls at a dam, with the boom raised high over the work area.
• Folded for the road. Another photo shows the boom folded back over the deck, with the cab still on top, in a yard at dusk.

These are the customer's own photos. No load weights or comments came with them. Some photos are near repeats taken from the same spot.

About the SQ20ZA7+1

The SQ20ZA7+1 is an earlier 20 t knuckle boom truck-mounted crane. It is no longer in the current range, and the technical department has no current drawing for it, so this record does not quote load figures for it. For a new crane of this size, see the 20 t knuckle boom truck-mounted crane page, where each current model has its own 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, a load the crane lifts easily close to the column can be too heavy once the extensions are pushed out. Outrigger span is the distance between the outrigger feet. A wider span keeps the truck steadier when the crane slews to the side. For general crane safety rules, see the OSHA cranes and derricks standard.

A cab on the column puts the operator above the truck, with a clear view of the hook on tall lifts. A crane with a high operator seat works in our delivery record from Qatar, and a 16 t telescopic crane lifts on a truck in our record from Thailand.

Lifting long pipes upright

Standing a long pipe on end puts the boom near upright, with the load hanging high above the crew. Four points to plan for:

1. Set the outriggers first. Put both outriggers down on firm ground or pads before the boom rises, even for a short lift.
2. Use a tag line. A long pipe turns in the wind. A rope on the lower end lets a worker steady it from a safe distance.
3. Check the radius at full height. The radius grows as the pipe swings out from the truck. Check the load chart at the widest radius the lift will reach.
4. Keep the crew out from under it. No one should stand under the raised pipe or between the pipe and the truck.

Other sizes are in the knuckle boom truck-mounted crane range, and the mounting and shipping page explains how mounting is handled.

Checking a truck for a 20 t crane

Before you order a current 20 t crane, check three things on your truck. They decide whether the crane fits it.

• Payload. The crane, its subframe and the outriggers all come off the truck's payload. Plan the body and the equipment you carry with what is left.
• Hydraulic power. The power take-off and pump on your truck must give the flow and pressure the crane needs.
• Space on the frame. Make sure the frame has room for the crane and its outriggers next to the equipment already on the truck.

If you run an SQ20ZA7+1 today, a photo of its nameplate helps us. Send 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.