Group: JTEKT Corporation
Catalog excerpts
INSTALLATION AND MAINTENANCE MANUAL FOR ROLLING MILL BEARINGS (1) FOUR-ROW TAPERED ROLLER BEARINGS (Cylindrical Bore) FOR ROLL NECKS
Open the catalog to page 1★The contents of this installation and handling manual are subject to change without prior notice. Every possible effort has been made to ensure that the data listed in this catalog is correct. However, we cannot assume responsibility for any errors or omissions. Reproduction of this installation and handling manual without written consent is strictly prohibited.
Open the catalog to page 2JTEKT manufacture and supply various types of roll neck bearings world widely. Among these bearings, straight bore four row tapered roller bearings have been mostly utilized. As the roll neck bearing is manufactured to a very high degree of precision, it must be handled with a corresponding degree of carefulness. Other wise, even an ideally designed and most accurately manufactured bearing cannot function as designed and in extreme cases, unexpected operating problems might be resulted. Therefore, the personnel in charge of bearing maintenance are required to have sufficient kowledge about...
Open the catalog to page 3Grease lubricated new bearings should never be unpackaged until just prior to installation. Oil mist lubricated bearings must be washed prior to installation to remove the rust preventive. Particularly careful washing is required on such parts as the cage, lubrication holes on the cup and cone spacers and cone ribs. Note : Grease lubricated bearings can be used with the rust preventive unremoved. Although the grease is discoloured due to mixture with the rust preventive, it does not have any influence on bearing performance.
Open the catalog to page 4Example of serial number and row number Serial Number Row Number See Fig. 1-2 for serial number and row number. • Oil stone • Sand paper • Microgrinder Photo. 1-2 Rework cup raceway Photo. 1-3 Checking cone raceway (pin-type cage)
Open the catalog to page 5*1) Non-loaded zone *2) This inspection does not apply to grease lubricated bearing The “Loaded Zone" occupies the arrowed portion of the bearing circumference, while the remaining portion is called “Non-loaded Zone".
Open the catalog to page 71-2 Preparation and Inspection of Roll Neck
Open the catalog to page 8Tools for inspection and rework • Micrometer • Square gage • Sand paper
Open the catalog to page 9Outboard end plate Fig. 1-7 Roll and chock general assembly Inspection required
Open the catalog to page 10• Slide calipers at mounting clearance in service clearance clearance
Open the catalog to page 111-4 Preparation and Inspection of Seals and End Plates Inspection required
Open the catalog to page 12Mount No. 1 and No. 2 oil seals on the outboard end plate with the same procedures as set out below. * Not required for grease lubricated bearings.
Open the catalog to page 15Mounting procedure Procedure diagram Photo Attach inboard end plate to chock
Open the catalog to page 16Example of serial number and row number VG-10-1 Serial Number Row Number Fig. 2-6 Load zone marking on the cup
Open the catalog to page 17Mounting procedure Procedure diagram Photo Install inboard double cone Install double Install cone spacer Install outboard spacer Install outboard double cone
Open the catalog to page 18Procedure details and cautions Grease lubricated bearings b. Install the inboard cup spacer marked row-No. 1~2. c. Lift the cone with the side showing row No. 1 down. Lower it into the chock on the cup already mounted. For oil mist lub. bearing : The cup spacer provided mist nozzle holes is equipped with two O-rings. Utmost care should be used in mounting the spacer not to damage or cut the O-rings. Make sure that the O-rings have proper interference with the chock bore. If the O-rings are too loose, the spacer will slide down the chock bore without effort. If, on the other hand, the O-ring...
Open the catalog to page 19Mounting procedure Procedure diagram Photo 12 13 Install the outboard single cup Attach the outboard end plate temporarily to chock Determine the axial gap between the outboard end plate and chock
Open the catalog to page 20Procedure details and cautions Install the single cup marked row No. 4 with aligning the same load zone mark with the previously mounted cups. a. Place the thrust ring on the cone face, then place the outboard end plate on the chock. (For reference, thrust ring is of either (A) or (B) design) b. Temporarily fit the outboard end plate on the chock with four bolts. a. Turn the chock 90° to lay the chock horizontally then fit a spider as shown. b. Tighten up the bolts on the end plate, while rotating the spider back and forth. Note : As the cups and cones have been installed vertically, first...
Open the catalog to page 21Mounting procedure Procedure diagram Photo Roll neck \ Fillet ring Coat grease or oil on the roll neck
Open the catalog to page 22Mounting procedure Procedure diagram Photo Mount the chock with bearing on roll neck 18 (1) Mount the thrust ring with lock nut (2) Then assemble halt ring
Open the catalog to page 24Procedure details and cautions Lift the chock complete with the bearing horizontally, and slide it onto the roll neck. (An automatic installation fixture may be used for quick mounting) a. Mount the thrust ring with the lock nut on roll neck at first, b. Assemble both halves of the half ring and align the slots thereon with the keyways on the roll neck, c. After inserting the key, bolt them together with a spring washer. a. Tighten the lock nut over the thrust ring until the bearing is clamped up against the fillet ring. (Use a tightening tool as shown in Photo. 2-16) b. Make sure that the...
Open the catalog to page 252-3 Dismounting Bearing Fig. 2-7 (1) Bearing lifting tools
Open the catalog to page 26The procedures for bearing removal are the reverse of the mounting procedures. As in mounting, the removal operation should be done in a clean environment. Also, the chock should be cleaned of scale, etc. before removing the bearing. Bearing removal requires lifting tools as shown, or other fixtures such as a floor press for convenience at disassembly.
Open the catalog to page 27A bearing that has been operated for an extended period of time will inevitably terminate its life due to material fatigue on its working surfaces. In order to prolong this normal fatigue life as well as to protect the bearing from failure during operation, it is necessary to utilize proper inspection and maintenance techniques. Any irregularity occurring in the bearing can be detected by checking noise, temperature and vibration. The maintenance personnel, therefore, should be familiar with these characteristics under normal operating conditions, and check them during operation as...
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