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Truck Crane Slewing Bearing Professional & Stable
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
Truck Crane Slewing Bearing characteristics
High-strength materials prevent fatigue fracture
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.
Deep quenching process to extend the wear life
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.
NBR sealing structure to prevent the invasion of impurities
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.
High-precision gear processing reduces mechanism vibration
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.
Multi-point compound lubrication system
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.
Integrated forging forming
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.
Truck Crane Slewing Bearing Detailed parameter table
| 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 |
Truck Crane Slewing Bearing Comparison Points
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.
Eliminate boom shaking abnormality
Prevention of early gear peeling and tooth breakage
Strictly prevent impurities from entering the raceway
Truck Crane Slewing Bearing Applicable crowd
Crane OEM manufacturer purchasing manager
looking for original truck crane slewing bearing with high adaptability and international quality certification for the production of 8-500-ton truck cranes.
The person in charge of a large construction machinery leasing company
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.
Industrial equipment maintenance and spare parts traders
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.
Port and logistics infrastructure project buyer
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.
Instructions for use Truck Crane Slewing Bearing
Calibration of installation base surface
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.
Bolt pre-tightening sequence
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.
Soft belt positioning
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.
Periodic lubrication and maintenance
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.
factory and certificate
certificate
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FAQ
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Truck Crane Slewing Bearing Professional & Stable
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
Truck Crane Slewing Bearing characteristics
High-strength materials prevent fatigue fracture
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.
Deep quenching process to extend the wear life
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.
NBR sealing structure to prevent the invasion of impurities
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.
High-precision gear processing reduces mechanism vibration
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.
Multi-point compound lubrication system
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.
Integrated forging forming
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.
Truck Crane Slewing Bearing Detailed parameter table
| 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. |
Truck Crane Slewing Bearing Comparison Points
Eliminate boom shaking abnormality
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.Prevention of early gear peeling and tooth breakage
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.Strictly prevent impurities from entering the raceway
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.Truck Crane Slewing Bearing Applicable crowd
Crane OEM manufacturer purchasing manager
looking for original truck crane slewing bearing with high adaptability and international quality certification for the production of 8-500-ton truck cranes.
The person in charge of a large construction machinery leasing company
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.
Industrial equipment maintenance and spare parts traders
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.
Port and logistics infrastructure project buyer
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.
Instructions for use Truck Crane Slewing Bearing
Calibration of installation base surface
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.
Bolt pre-tightening sequence
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.
Soft belt positioning
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.
Periodic lubrication and maintenance
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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