The SQZ84B.3 4 ton knuckle boom loader crane is a purpose-built, reinforced heavy-lifting solution engineered by Tengchang Construction Machinery for heavy construction contractors, infrastructure project operators, and industrial equipment rental enterprises operating in demanding, high-intensity work environments. With a class-leading 8.4 t.m lifting moment, reinforced high-strength steel structure, and full 360° precision slewing, this 4 ton folding boom truck mounted crane delivers uncompromising stability, durability, and lifting performance for heavy-duty tasks. Designed to withstand continuous, long-duration operation, it sets a new standard for reliability in heavy-load lifting applications across diverse industrial sectors.
With a total crane weight of 1600 kg, the upgraded boom and chassis structure deliver exceptional torsional rigidity and overall stability, purpose-built for heavy-duty, long-duration lifting tasks. This reinforced design minimizes structural fatigue during continuous high-load operation, reducing maintenance costs and maximizing uptime for high-volume commercial operations.
The unlimited 360° rotation 4 ton crane system provides smooth, controlled, and fully unrestricted positioning, drastically improving safety and accuracy during lifting operations in complex, tight, or restricted work areas. This precision slewing capability allows operators to navigate obstacles and position heavy loads with millimeter-level accuracy, even in congested job sites.
Engineered with a stabilized 28 MPa rated hydraulic pressure and optimized 25 L/min oil flow, this 4 ton heavy lifting hydraulic crane delivers consistent, jolt-free boom movement and reliable lifting performance, even when operating at maximum rated capacity. The system maintains precise control during heavy-load handling, eliminating sudden shifts and enhancing on-site safety.
Despite its heavy-duty reinforced design, this 4 ton truck mounted loader crane retains a compact 850 mm installation footprint, ensuring seamless compatibility with a wide range of light and medium-duty truck chassis. This flexible design allows fleet operators to integrate the crane into existing vehicle fleets without extensive modifications, reducing upfront investment costs.
Core Performance Parameters | Specification |
Maximum Lifting Weight | 4000 Kg |
Max Lifting Moment | 8.4 t.m |
Recommended Power | 15 kW |
Recommended Hydraulic Flow | 25 L/min |
Rated Hydraulic Pressure | 28 MPa |
Slewing Angle | 360° |
Slewing Pressure | ≤20 MPa |
Hydraulic Crane Weight | 1600 kg |
Installation Space | 850 mm |
Oil Tank Capacity | 60 L |
This heavy-duty 4 ton knuckle boom crane is engineered for high-stakes, heavy-load lifting operations across high-demand sectors, including heavy construction material lifting for large-scale commercial and infrastructure building projects, industrial equipment transport and installation for manufacturing facilities, highway and bridge infrastructure engineering projects, high-reliability logistics fleets handling oversized or high-value cargo, and equipment rental enterprises serving construction, mining, and utility sectors.
To ensure maximum safety and service life of your 4 ton heavy-lifting truck crane, follow these mandatory operational and maintenance guidelines: Pre-operation: Complete a full site inspection to identify overhead obstacles and hazards, confirm the truck is level, outriggers are fully extended with support pads, and all safety systems are functional before initiating lifts. During operation: Strictly adhere to the official load chart, never exceed rated capacity for the current boom radius, avoid extending working radius while rotating a loaded boom, and never lift loads over personnel. Scheduled maintenance: Implement regular lubrication of all pivot points, routine inspection of hydraulic hoses and seals, and torque checks on structural bolts, with all work completed by certified, trained personnel.
This model is widely used by heavy construction contractors, infrastructure engineering firms, industrial logistics operators, and equipment rental enterprises that require reliable, high-capacity lifting for continuous, demanding operations.
Yes, we supply comprehensive technical documentation, including detailed installation drawings, operation manuals, and maintenance guides, along with full technical support to assist with seamless fleet integration.
We welcome global long-term partnerships, including OEM, ODM, and exclusive distributor cooperation, with tailored solutions to meet the unique needs of our commercial and industrial clients worldwide.
