HE21E-001

Instruction Manual
Insert Bearing Units
Eco Series(Eccentric locking collar type)Table of ContentsPage

1.

Scope of application ......................................................................................................................................................................... 1

2.

Name of parts and functions ............................................................................................................................................................ 2

3.

Selection of shafts ............................................................................................................................................................................ 3

4.

Mounting method .............................................................................................................................................................................. 4

5.

Stainless-steel cover attachment/removal method ......................................................................................................................... 66.

Inspection.......................................................................................................................................................................................... 71)

Noise ............................................................................................................................................................................................ 72)

Rise of temperature ..................................................................................................................................................................... 77.

Lubrication......................................................................................................................................................................................... 88.

Replacement of bearing ................................................................................................................................................................... 9Insert Bearing Units (Eccentric locking collar type)

1. Scope of application
This instruction manual applies to the insert bearing units shown in Table 1.
Table 1
Standard product units

Units with steel plate cover

Pillow block unit

Rhombic flangeunit

Pillow block unit

Rhombic flangeunit

MUSP000
MUSP001
MUSP002

MUSFL000
MUSFL001
MUSFL002

MUSP000C(E)MUSP001C(E)MUSP002C(E)MUSFL000C(E)MUSFL001C(E)MUSFL002C(E)MUSP003
MUSP004
MUSP005

MUSFL003
MUSFL004
MUSFL005

MUSP003C(E)MUSP004C(E)MUSP005C(E)MUSFL003C(E)MUSFL004C(E)MUSFL005C(E)MUSP006

MUSFL006

MUSP006C(E)MUSFL006C(E)Remark: This instruction manual also applies to the insert bearing units marked with auxiliary marks (Note 1) andaggregation marks (Note 2) in addition to the standard products shown in Table 1.
(Note)

1. Special and change marks showing accuracy, shape, additional processing, etc. for bearings, housings andmain parts.
2. Abbreviated marks for special parts whose nominal number consists of many characters and is complicated.

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Insert Bearing Units (Eccentric locking collar type)

2. Name of parts and functions

Rubber seal

HousingOuter ring

Set screw
Eccentric locking collar
Inner ring
Retainer
Steel ballRubber seal:Prevents grease leakage and dust and moisture intrusion because it is secured to the outer ringand the lip part comes in contact with the inner ring.

Eccentric locking collar:

Secures the insert bearing and shaft. This collar is provided with an eccentric part which drives
several wedges on the circumferences of the inner ring eccentric part and shaft to secure thebearing to the shaft.

2

Insert Bearing Units (Eccentric locking collar type)

3. Selection of shafts
For the shaft on which the insert bearing unit will be mounted, use one that is not bent and does not have burrs, andperform chamfering of the shaft ends. The press-fitting of the inner ring and shaft is mostly performed by a running fit ingeneral for convenience in handling. The values shown in Table 3.1 are considered appropriate for the shaft dimensional
tolerance in the case of loose press-fitting.
If high-precision operation and high-speed rotation are required, it is better to perform the press-fitting between the innerring and shaft by interference fit. The values shown in Table 3.2 are considered appropriate for the shaft dimensional
tolerance in the case of tight press-fitting. If using an insert bearing unit with eccentric locking collar for interference fit, it isunnecessary to use a separate eccentric locking collar. For tight press-fitting of the bearing and shaft, the initial clearanceof the bearing must have been designed in advance to be larger than that of standard specification.
Table 3.1: Shaft dimensional tolerance (for loose press-fitting)
Shaft diameter (mm)Shaft dimensional tolerance (μm)

Over

Or less

js7h761018101830±7.5±9±10.5

0 to -15
0 to -18
0 to -21

Remarks: In general, js7 shall be applied.
Table 3.2: Shaft dimensional tolerance (for tight press-fitting)
Shaft diameter (mm)Shaft dimensional tolerance (μm)

OverOr lessm661018101830+15 to +6+18 to +7+21 to +83

Insert Bearing Units (Eccentric locking collar type)

4. Mounting method
1) Slide the insert bearing unit onto the shaft slowly and bring it to the predetermined position. (Photo 4.1)
2) Mount the insert bearing unit on the machine base and secure it firmly with bolts. (Photo 4.2) (Refer to Table 4.1.)
3) Press-fit the eccentric part of the eccentric locking collar into the eccentric part provided on the bearing inner ring.
(Photo 4.3)
4) Tighten the eccentric locking collar in the shaft rotation direction.
5) Tighten the set screws with a hexagonal wrench key and secure them to the shaft. (Refer to Table 4.2.)

Remarks: 1. Before sliding the eccentric locking collar onto the shaft, check that the tips of set screws do not protrude
from the inside diameter of bearing. If a tip protrudes, loosen the set screw.
2. When sliding the insert bearing unit onto the shaft, be careful that the unit does not get twisted. In addition,
do not tap the inner ring side or the rubber seal directly.
3. The values shown in Table 4.1 are considered appropriate for the tightening torque for bolts for the bearing
housing.
4. The machine base to which the unit is mounted must be rigid enough and flat to prevent the bearing housingfrom be deformed. (Flatness: 0.1mm or lower)
5. In case of systems rotating in both normal and reverse directions, the following method should be taken.
a) After tightening the eccentric locking collar by hand, tighten it further with a larger torque. (Insert jigs
such as a chisel, etc. into the eccentric locking collar drill hole and tighten further with a plastic hammer.)(Photo 4.4)b) Use a stepped shaft and apply the inner ring to the shoulder.
c) When using the insert bearing unit with 2 eccentric locking collars in pairs, mount it properly so that both
eccentric locking collars are positioned on the outside or inside. (At this time, the insert bearing unit
cannot bear large axial loads.)d) Secure the inner ring using the collar for securing in the axial direction.
6. The values shown in Table 4.2 are considered appropriate for tightening torque of eccentric locking collars.

4Insert Bearing Units (Eccentric locking collar type)

Photo 4.1

Photo 4.2

Photo 4.3

Photo 4.4

Table 4.1: Tightening torque of housing mounting bolts (Reference value)
Nominal size of screw

Torque(N•m)

M6
M8
M10

2.8 to 4.5
6.9 to 11
14 to 22

Table 4.2: Tightening torque of set screws for eccentric locking collars and axial load-bearing capacity of unit
Nominal numberof applicablebearing

Nominal sizeof set screw

Nominal size ofhexagonal
wrenchTightening torque(N•m)

Axial loadbearing capacity(kN)

MU000 to 003
MU004 to 006

M4×0.721.5

0.88

M5×0.8

2.5

2.9

1.76

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Insert Bearing Units (Eccentric locking collar type)

5. Stainless-steel cover attachment/removal method1) Attaching the cover*Attach the cover after completion of attachment of the unit main body.

*

Apply an amount of grease corresponding to 1/3 to 1/2 of the volume of the space inside the cover to that space.
(Fig. 5.1)

In the case of clip-locking type•

Pillow block (Fig. 5.2)

(1)

Hook the claw on one side of the clip into the groove on one side of the cover.

(2)

Push the claw on the other side of the clip strongly into the cover groove on the opposite side.

•Rhombic flange (Fig. 5.3)

(1)

Hook the L-shaped claw of the clip onto the clip seat of the bearing housing.

(2)

Push the other claw strongly into the cover groove.
*

If it is difficult to install the clip, first hook the claw of the clip into the cover groove and then push it into theclip seat of the bearing housing.

Pack with grease(2) Push strongly(1)(2) Push
strongly(1)

Fig. 5.1

Fig. 5.2

Fig. 5.3

Note
1. For the inner cover with a rubber seal, slide the cover onto the shaft in advance before mounting the unit mainbody.
2. In order to improve dust and moisture resistance, apply grease also to the surface of the shaft that comes into
contact with the spigot joint of the bearing housing and the lip part of the rubber seal in advance.

6Insert Bearing Units (Eccentric locking collar type)

6. Inspection
After finishing mounting the insert bearing unit, inspect whether the mounting conditions are appropriate or not.
First, turn the shaft by hand to check that the insert bearing unit rotates smoothly. If no problem is observed, rotate it byelectric power to inspect for noise or temperature increases.
1) NoiseTouch the housing with a listening rod or screwdriver and listen for noises during operation to check for abnormalities.
(Photo 6.1)
For normal operation conditions, a smooth rotation noise is generated, but if there is an abnormality in mounting, anabnormal noise may be generated.
2) Rise of temperature
Measure the temperature on the outer circumferences of the bearing outer ring or housing during operation. (Photos6.2 and 6.3)
The rise of temperature reaches saturation 2 to 3 hours after start of operation and the insert bearing unit reaches its
regular conditions; however, if there are abnormalities in mounting, etc., the temperature will increases excessively,
which will prevent the insert bearing unit from reaching its regular conditions.
Inspect the above items during commissioning and start operating the insert bearing unit fully only after checking that
there is no abnormality.
Further, it is recommended that inspections also be performed periodically at the predetermined interval during
operation to detect failures in the bearings at an early stage.
In addition, monitoring to check that there are no changes in noise or increases in temperature by comparing thedifferences between the results of the current periodic inspections and other inspections is an effective measure forpreventing accidents and damage to machinery.
For main abnormalities and countermeasures during commissioning and periodic inspection, check the general
catalogue for insert bearing units and the page “Inspection and malfunction(https://www.asahiseiko.co.jp/qa/bearings.html)” on our website.

Photo 6.1: Checking the rotationnoise with a listening rod

Photo 6.2: Temperature
measurement (contact type)

Photo 6.3: Temperature
measurement (non-contact type)7

Insert Bearing Units (Eccentric locking collar type)

7. Lubrication
This unit insert bearing has been factory-lubricated with the grease shown in Table 7. This unit uses the lubrication-freetype.
Table 7: Properties of standard factory-lubricated grease
TypeModel

Product name

Manufacturer name

NLGI
No.

SoapbasedgreaseDroppoint(°C)

Usabletemperaturepoint(°C)

For foodmachineuse

MUSPMUSFL

CLARION @ FOOD
MACHINERY HTEPGREASE, No. 2

CITGO Petroleum
Corporation2

Al-mixed

260-12 to +163

* The usable temperature point of this unit is -10 to + 100°C.

8Insert Bearing Units (Eccentric locking collar type)

8. Replacement of bearing
When replacing the insert bearing unit with a new one, if either the bearing or housing is slightly damaged, replacement ofeither one is possible instead of replacing both ones.
When assembling the bearing into the housing, position the bearing outer ring at right angles to the bearing seat, andpress-fit it into the notched part of housing, and then turn the bearing. (Photos 8.1, 8.2 and 8.3)

Photo 8.1

Photo 8.2

Photo 8.3

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Mar. 2021