RELIANCE 76876-34L split spherical bronze sleeve bearing
76876-34L is split spherical bronze sleeve bearing made by Reliance Electric for E5800 and E6800 series large heavy-duty DC industrial motors, belonging to unified 76876 base bearing product family alongside 76876-31R. It is constructed from high density tin-lead bronze alloy with pre-machined internal lubrication grooves and radial split opening structure. The L suffix stands for lengthened inner oil groove design compared with standard R version, optimized for continuous high-load and high-dust industrial working conditions to prolong grease retention cycle, used as original replacement spare part for worn main shaft bearing bush during motor overhaul.76876-34L is split spherical bronze sleeve bearing made by Reliance Electric for E5800 and E6800 series large heavy-duty DC industrial motors, belonging to unified 76876 base bearing product family alongside 76876-31R. It is constructed from high density tin-lead bronze alloy with pre-machined internal lubrication grooves and radial split opening structure. The L suffix stands for lengthened inner oil groove design compared with standard R version, optimized for continuous high-load and high-dust industrial working conditions to prolong grease retention cycle, used as original replacement spare part for worn main shaft bearing bush during motor overhaul.
Description
1. Product Introduction
76876-34L is split spherical bronze sleeve bearing made by Reliance Electric for E5800 and E6800 series large heavy-duty DC industrial motors, belonging to unified 76876 base bearing product family alongside 76876-31R. It is constructed from high density tin-lead bronze alloy with pre-machined internal lubrication grooves and radial split opening structure. The L suffix stands for lengthened inner oil groove design compared with standard R version, optimized for continuous high-load and high-dust industrial working conditions to prolong grease retention cycle, used as original replacement spare part for worn main shaft bearing bush during motor overhaul.
2. Model Definition Explanation
76876 is fixed base part number representing core dimension specification of this series main motor sleeve bearing for Reliance E5800/E6800 DC motor platform. 34 indicates revised dimensional grade matching dedicated shaft and bearing housing installation tolerance different from 31R model. L suffix means long-type optimized lubrication slot layout, lengthened annular oil storage groove inside bearing bore to improve continuous lubrication performance against harsh field environment.
3. Technical Specifications
Raw material is high wear-resistant tin-lead bronze alloy. Spherical inner bore size keeps 3.750 inch standard dimension, outer diameter 5.375 inch, overall bushing width consistent with factory standard matching size. Single unit net weight around 4.0 lbs. Applicable ambient operating temperature range is -20℃ to +80℃, maximum allowable linear rotating speed limited to 3.5m/s under regular lithium grease lubrication. The lengthened inner oil groove increases effective grease storage volume by nearly 15% versus regular R type bearing.
4. Interface and Communication Configuration
This is pure mechanical fitting component without any electronic wiring, signal terminals or digital communication circuits. Outer cylindrical surface adopts interference fit with motor bearing pedestal inner hole, spherical inner bore closely cooperates with main motor shaft journal. Radial split notch allows field installation without complete disassembly of motor rotor shaft. All lubrication supply depends on external centralized grease filling port reserved on bearing housing, no built-in sensor or communication expansion interface on bearing body.
5. Core Functions
Undertake heavy radial load generated from rotating main shaft of large DC motor during running process. Reduce metal friction between rotor shaft and bearing base via bronze self-lubricating characteristic. The lengthened internal oil groove stores more lubricating grease to effectively avoid dry grinding and direct metal scratching under intermittent refueling condition. Split structure absorbs minor shaft radial runout and operation vibration to protect motor journal from abrasion and equipment locking fault.
6. Application Scenarios
Specially matched with Reliance E5800 and E6800 series heavy-duty DC drive motors, mainly applied in metallurgical rolling mill main transmission, large plastic extruder driving system, mining heavy conveyor prime drive and oversized industrial exhaust fan main motor units. Widely stocked as maintenance spare inventory for regular equipment overhaul and damaged bearing replacement in steel, chemical, heavy machinery and non-ferrous metal processing industries.
7. Operation and Maintenance Instructions
Cut off all equipment power and implement lockout protection before disassembly and replacement work. Fully clean residual waste grease and surface burr inside bearing pedestal cavity and motor shaft journal surface before installing new bearing bush. Fill high-temperature resistant lithium base grease through designated lubrication nozzle every one to three months, extend refuel interval appropriately for clean working site. Periodically monitor motor running noise and shaft vibration value; replace bearing immediately once abnormal vibration or noise appears caused by excessive inner surface wear, forbid long time over-tolerance running of defective bearing.
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