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Truck crane slewing bearing is a heavy-duty slewing assembly specially designed for mobile cranes. Through 42CrMo high-strength quenched and tempered steel and precision raceway quenching process, it can realize 360 degree smooth rotation while bearing huge overturning torque, ensuring extremely high stability and safe load capacity of lifting operation and supporting bulk purchase.
42CrMo steel
Material
55-62 HRC
Raceway hardness
DIN grade 5-6
Gear accuracy
high-strength alloy tempered steel is selected, with tensile strength ≥ 1080MPa, which is 30% higher than that of ordinary 50Mn materials in impact resistance, and effectively prevents matrix deformation and fatigue fracture under heavy load operation.
raceway after intermediate frequency induction hardening, hardening layer depth of 3-5mm, hardness stability in 55-62 HRC, so that the bearing wear life than conventional process extended 3-5 years.
the use of reinforced nitrile rubber 3 lip seal, protection level of IP65, even in the construction site of high dust, rainstorm environment can also prevent the loss of grease and external impurities invasion.
gear modulus and tooth profile accuracy strictly follow DIN Class 6 standard, and return clearance is controlled between 0.15-0.25mm, which significantly reduces mechanism vibration during rotation and improves the accuracy of hoisting and positioning.
4-8 oil nozzles are evenly arranged in a circumferential direction to ensure that the grease can cover 100% of the stress area of the raceway, and the friction coefficient is reduced to below 0.003, thus greatly reducing the starting resistance.
seamless ring forging technology is adopted to eliminate the porosity and segregation in the metal, the static bearing capacity is 40% higher than that of the welded structure, and the extreme tilting moment under the full extension of the boom can be calmly dealt.
| Parameter name | Specifications/Indicators | Industry Standards/Reference Values |
| Main material | 42CrMo / 50Mn | GB/T 3077 / EN 10083 |
| Structure type | Single-row four-point contact ball type / Double-row ball type | JB/T 2300-2011 |
| Raceway surface hardness | 55 HRC ~ 62 HRC | Induction hardening depth: 2.5-5.0mm |
| Gear type | External gear type / Internal gear type (straight gear) | Modules M6 – M24 (customizable based on tonnage) |
| Tooth surface hardness | 45 HRC ~ 55 HRC (tempering or quenching optional) | Prevent tooth root breakage |
| Radial/Axial Runout | ≤ 0.20 mm | P5 / P6 accuracy class standard |
| Sealing method | Reinforced triple-lip sealing strip (NBR/FKM) | Sealing operating temperature -40℃ to +120℃ |
| Recommended bolt strength | Level 10.9 / Level 12.9 | ISO 898-1 High Strength Standard |
| Service life design | 10,000 ~ 15,000 working hours | Depends on load frequency and maintenance level |
This product is specially optimized for the frequent rotation switching and severe dynamic load of mobile cranes. Compared with general-purpose slewing bearings, it has higher load density and stronger impact resistance.
by controlling the radial clearance within the strict tolerance range of 0.1mm, the problem of large swing of the boom end caused by loose matching of the traditional support is solved, and the positioning of high-altitude operation is ensured without deviation.
In view of the pain point of large instantaneous starting torque of truck crane, tooth root strengthening and tooth surface displacement processing are adopted to solve the common tooth surface pitting and fracture problems in the industry, and the power transmission is more reliable.
the improved sealing lip structure has self-compensation function, which solves the problem of jamming or abnormal wear caused by external particles entering the raceway under muddy or desert conditions, and reduces the number of unplanned shutdowns.
looking for original truck crane slewing bearing with high adaptability and international quality certification for the production of 8-500-ton truck cranes.
it is necessary to regularly purchase high-quality replacement parts to carry out fleet maintenance, reduce downtime losses caused by slewing system failures, and extend the service life of vehicles.
to provide end users with cost-effective, long-life non-standard customized or standard model slewing bearings to meet the needs of construction machinery maintenance in the regional market.
responsible for the addition of key components of mobile lifting equipment such as terminal cranes and truck cranes to ensure the continuous operation safety of lifting equipment in coastal high salt fog environment.
before installation, the support seat must be checked with a precision leveling ruler to ensure that the flatness tolerance of the installation surface is ≤ 0.3mm/m, so as to prevent the bearing from being stuck due to additional stress after installation.
Grade 10.9/12.9 high-strength bolts must be used, and the rated torque must be reached in three times (30%, 60%, 100) according to the "star crossing method" to ensure uniform force.
the "S" mark on the support must be placed in the non-main force area of the crane (I. e. the non-constant operation angle side of the boom) to avoid the early fatigue of the base caused by cyclic stress.
the raceway shall be greased once every 100 hours, the tooth surface shall be cleaned and greased every 10 days, and the support shall be slowly rotated during greasing until new oil overflows at the sealing strip.
certificate
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Truck crane slewing bearing is a heavy-duty slewing assembly specially designed for mobile cranes. Through 42CrMo high-strength quenched and tempered steel and precision raceway quenching process, it can realize 360 degree smooth rotation while bearing huge overturning torque, ensuring extremely high stability and safe load capacity of lifting operation and supporting bulk purchase.
Material
42CrMo steel
Raceway hardness
55-62 HRC
Gear accuracy
DIN grade 5-6
high-strength alloy tempered steel is selected, with tensile strength ≥ 1080MPa, which is 30% higher than that of ordinary 50Mn materials in impact resistance, and effectively prevents matrix deformation and fatigue fracture under heavy load operation.
raceway after intermediate frequency induction hardening, hardening layer depth of 3-5mm, hardness stability in 55-62 HRC, so that the bearing wear life than conventional process extended 3-5 years.
the use of reinforced nitrile rubber 3 lip seal, protection level of IP65, even in the construction site of high dust, rainstorm environment can also prevent the loss of grease and external impurities invasion.
gear modulus and tooth profile accuracy strictly follow DIN Class 6 standard, and return clearance is controlled between 0.15-0.25mm, which significantly reduces mechanism vibration during rotation and improves the accuracy of hoisting and positioning.
4-8 oil nozzles are evenly arranged in a circumferential direction to ensure that the grease can cover 100% of the stress area of the raceway, and the friction coefficient is reduced to below 0.003, thus greatly reducing the starting resistance.
seamless ring forging technology is adopted to eliminate the porosity and segregation in the metal, the static bearing capacity is 40% higher than that of the welded structure, and the extreme tilting moment under the full extension of the boom can be calmly dealt.
| Parameter item | Specifications/Description | Notes |
| Standard Sizes | BQ, NQ, HQ, PQ, PQ3 | Compliant with DCDMA international standards |
| Cutter Size | 1308 (13mm), 1613 (16mm), 1913 (19mm) | Select based on the hardness of the formation |
| Blade Count | 3 – 6 wings | Few-bladed drills are suitable for fast drilling in soft rock, while multiple-bladed drills are suitable for hard rock. |
| Applicable lithology (Formation) | Mudstone, sandstone, limestone, shale, salt rock | Mohs hardness 3-7 (f < 12) |
| Body Material | Matrix Body / Steel Body | The tire body is wear-resistant, and the steel body is impact-resistant. |
| Back Rake | 15° – 25° adjustable | The larger the angle, the stronger the impact resistance; the smaller the angle, the faster the cutting speed. |
| Connection thread | API Regular, IF, or special core-taking tube thread | After high-frequency quenching treatment, it is fatigue resistant. |
| Recommended WOB (Working Weight on Drill) | 6 – 15 kN (depending on drill bit diameter) | Compared to impregnated diamond bits, it requires less drilling pressure. |
by controlling the radial clearance within the strict tolerance range of 0.1mm, the problem of large swing of the boom end caused by loose matching of the traditional support is solved, and the positioning of high-altitude operation is ensured without deviation.
In view of the pain point of large instantaneous starting torque of truck crane, tooth root strengthening and tooth surface displacement processing are adopted to solve the common tooth surface pitting and fracture problems in the industry, and the power transmission is more reliable.
the improved sealing lip structure has self-compensation function, which solves the problem of jamming or abnormal wear caused by external particles entering the raceway under muddy or desert conditions, and reduces the number of unplanned shutdowns.
looking for original truck crane slewing bearing with high adaptability and international quality certification for the production of 8-500-ton truck cranes.
it is necessary to regularly purchase high-quality replacement parts to carry out fleet maintenance, reduce downtime losses caused by slewing system failures, and extend the service life of vehicles.
to provide end users with cost-effective, long-life non-standard customized or standard model slewing bearings to meet the needs of construction machinery maintenance in the regional market.
responsible for the addition of key components of mobile lifting equipment such as terminal cranes and truck cranes to ensure the continuous operation safety of lifting equipment in coastal high salt fog environment.
before installation, the support seat must be checked with a precision leveling ruler to ensure that the flatness tolerance of the installation surface is ≤ 0.3mm/m, so as to prevent the bearing from being stuck due to additional stress after installation.
Grade 10.9/12.9 high-strength bolts must be used, and the rated torque must be reached in three times (30%, 60%, 100) according to the "star crossing method" to ensure uniform force.
the "S" mark on the support must be placed in the non-main force area of the crane (I. e. the non-constant operation angle side of the boom) to avoid the early fatigue of the base caused by cyclic stress.
the raceway shall be greased once every 100 hours, the tooth surface shall be cleaned and greased every 10 days, and the support shall be slowly rotated during greasing until new oil overflows at the sealing strip.
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