Knuckle Boom Marine Cranes

SQ4ZA3TJ4 Ton Knuckle Boom Marine Crane

SQ: Truck mounted crane
4: 4 t capacity class
Z: Knuckle boom
A3: 1 main boom + 2 hydraulic booms
T: Marine version
J: With winch

Max Lifting Capacity: 4000kg
Max Lifting Moment: 8.4t·m
Recommended Power: 15kW
Hydraulic System Flow: 25L/min

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Or message us +86 158 5249 9415 info@boblift.com

12-month warranty
Order from 1 unit
Shipping & warranty

Confirm your configuration and current availability with our team.

Engineering data

SQ4ZA3TJ Specifications

Lifting

Max Lifting Capacity: 4000kg
Max Lifting Moment: 8.4t·m
Rotation Angle: 360° continuous
Winch: Included

Hydraulics and power

Recommended Power: 15kW
Hydraulic System Flow: 25L/min
Hydraulic System Pressure: 26MPa
Oil Tank Capacity: 60 L

Machine

Self Weight: 1256kg

Reach and outriggers

Max. radius: 7.7m
Max. height: ≈ 9.5 m
Max. boom angle: 75°

Figures from the BOB-LIFT brochure for this range. Confirm the final specification with our team before ordering.

Compare all Knuckle Boom Marine Cranes

Dimensions and load chart

Select the drawing to view it full size.

How much it lifts at each reach The further the hook is from the crane, the less it can lift: 4,000 kg at 2.1 m, 850 kg at 7.7 m.

Lifts (kg)	4,000	1,750	1,250	850
Reach (m)	2.1	4.35	5.9	7.7

Reach is measured from the slewing centre to the hook. Figures from the drawing above.

Product details · SQ4ZA3TJ

4 Ton Knuckle Boom Marine Crane

Why Purchase the 4 Ton Knuckle Boom Marine Crane?

The 4 Ton Knuckle Boom Marine Crane is a professional machine perfect for various lightweight tasks in cargo moving environments. Buying the crane provides you with a lot of advantages, including timely deliveries and great after-sales services.

The crane is designed with advanced development and analysis. It has a compact structure, a good load ratio, and is lightweight. The crane has an inclined rack cylinder with a boom that folds to make better use of space and lower its center of gravity. This makes the vehicle it's attached to more stable when driving.

The 4 Ton Knuckle Boom Marine Crane can be adjusted to fit various customer requirements and needs. Additionally, it is designed to make it easier to attach new products to make it easier to use.

Capacity class

4 t

Max lifting moment 8.4 t·m
Knuckle boom sections

3

1 main boom + 2 hydraulic booms
Hydraulic flow

25 L/min

26 MPa · 15 kW recommended

Choosing the right model

Need more than 4 t? The next class up is the BLZ90K4TJ at 4.6 t. For lighter loads, the SQ3.2ZA3TJ at 3.2 t is the class below.

Before ordering, check that the vessel's hydraulic supply can deliver 25 L/min at 26 MPa. We recommend 15 kW of hydraulic power.

Knuckle Boom Marine Crane

Product technical advantages

High-strength steel structure

Compact, light and strong steel structure.
Custom installation

Pedestal mounting tailored to your deck.
Optional attachments

Winch, drill pipe, basket or grapple.
Operation modes

Manual levers, overhead seat or wireless remote.
Dual four-bar linkage

Reverse-angle reach for flexible work.

Dedicated torque limiter Load moment limiter, safety certified.
Marine anti-rust treatment Multi-layer anti-rust process for sea duty.

Manufacturing & delivery

From our workshop to your port

01

Assembly

Slewing base, column and booms are assembled by hand in our Xuzhou workshop.
02

Marine test stand

Mounted on a deck-style stand, the crane runs every boom and slewing motion before release.
03

Final check

Finished cranes are inspected and lined up for dispatch.
04

Packing

Wrapped in film and strapped to protect paint and hydraulics in transit.
05

Container loading

Loaded into containers at the factory and shipped to your port.

Shipping & warranty

Shipping, warranty and documents

How the SQ4ZA3TJ reaches you, and what happens after it arrives.

Shipping

Lead time and container loading are confirmed with your quotation.

Warranty and parts

12 months

Send the model, serial number and a photo or video of the issue; our team guides the repair and ships the parts.

Order from 1 unit

Documents

Marine Cranes Brochure

PDF · 12 pages · 8.3 MB

Download PDF
Dimensions and load chart
SQ4ZA3TJ Specifications

FAQ

Questions about the SQ4ZA3TJ

About the SQ4ZA3TJ

01 What hydraulic supply does the SQ4ZA3TJ need?

25 L/min at 26 MPa. We recommend 15 kW of hydraulic power. Send us the vessel's hydraulic data and we confirm the match when we quote.

02 What warranty and minimum order apply to the SQ4ZA3TJ?

The SQ4ZA3TJ carries a 12-month warranty, and you can order from 1 unit.

Not answered here?

Send us your question and our team replies with answers for your site.

+86 158 5249 9415