HITACHI SV 8SA, SV 12SF User guide
MODELS SV 8SA/SV 12SF
1. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY
Please pay particular attention to the following items during disassembly and reassembly.
Since the SV 8SA and the SV 12SF are of the same structure, explanation is given only on the Model SV 8SA. The [Bold] numbers in the description correspond to the item numbers in the parts exploded diagram of the SV 8SA and the numbers in <Bold> to those in the parts exploded diagram of the SV 12SF.
1-1. Disassembly
1-1-1. Remove the Felt Pad or the Pad [19] <19>
Remove the Felt Pad or the Pad [19] <19> by removing the four M4 x 10 Machine Screws [20] <20>.
1-1-2. Remove the Base [18] <18>
Remove the Base [18] <18> together with the Paper Clips [37] <37> and the Felt [36] <36> by pulling out the Base [18] <18> in the arrow-indicated direction.
1-1-3. Remove the Fan Guide [34] <34>
Remove the Fan Guide [34] <34> removing the two D4 x 20 Tapping Screws [35] <35>.
1-1-4. Remove the Thrust Washer [32] <32> , the Ball Bearing 6001 DDUCM [31] <31> , the Dust Washer [30] <30> and the Balancer Fan [29] <29>
Remove the Thrust Washer [32] <32> , the Ball Bearing 6001 DDUCM [31] <31> , the Dust Washer
[30] <30> and the Balancer Fan [29] <29> by removing the M4 x 12 Machine Screw [33] <33>.
[29] <29>
[30] <30>
[31] <31> [32] <32> [33] <33>
[34] <34>
[35] <35>
[36] <36>
[18] <18>
Pull out
[37] <37>
[19]<19>
[20]<20>
Fig. 3
−#1 −
1-1-5. Remove the Housing (B) [3] <3> and the Legs [16] <16>
After removing the Base [18] <18> and the Balancer Fan [29] <29> as indicated above, cut the Grip Tape [4] <4> along the perforations with a cutter. Then remove the four Tapping Screws with D4 Flanges [2] <2> securing the Housing (A) [12] <12> and the Housing (B) [3] <3> together, and the latter can be removed. The Legs [16] <16> can be removed by pulling them out of the Housing (A) [12] <12> or the Housing (B) [3] <3>.
1-1-6. Disassembly of the Armature [28] <28>, the Stators [25] <25> and Other Parts
(1)Remove the two Carbon Brushes [15] <15> by lifting the Brush Holders [14] <14> off the Housing
(A) [12] <12>.
(2)Loosen the positive (+) terminal screw of the Slide Switch [22] <22> with a Phillips screwdriver
and remove the lead wires of the Noise Suppressor [5] <5> (excl. the U.S.A.) and Cord [10] <10> and the lead wires of the Stator [25] <25>.
(3)Loosen the negative (-) terminal screw of the Pillar Terminal [21] <21> with a flat-blade screwdriver and remove the lead wires of the Cord [10] <10> and the lead wires of the Stator
[25] <25>, and the parts inside the Housing can then be removed.
(4)With a bearing puller, pull of the two Ball Bearings 608 VVC2 [24] <24> press-fitted on both ends of the Armature [28] <28>.
1-2. Reassembly
Proceed as follows, paying particular attention to the items below.
1-2-1. Assembly of the Armature [28] <28> and the Stators [25] <25>
(1)With a hand press, press the two Ball Bearings 608VVC2 [24] <24> until they hit against the stepped portion of the Armature Shaft.
(2)Place the Stators [25] <25> and the Armature [28] <28> in sequence within the Housing (A) [12] <12> and make sure that the Armature [28] <28> can turn freely.
1-2-2. Installing the Balancer Fan [29] <29> and the Dust Washer [30] <30>
When inserting the Balancer Fan [29] <29> into the Armature Shaft, bring their flat faces into alignment. Also
observe the proper direction of the Dust Washer [30] <30>. (See Fig.4.)
Armature Shaft flat portion
Bring this flat face into alignment with that of the Armature Shaft.
Install this with the recessed side facing the Balancer Fan [29] <29>.
Fig.4
[28]<28>
[24]<24>
[29]<29>
[30]<30>
−#2 −
1-2-3. Installing the Base [18] <18>
Install the Legs [16] <16> so that their lower parts are
Lower part
fitted within the Ribs. (See Fig.5.)
[18] <18>
1-3. Screw Tightening Torque
Fig. 5
D4 x 10 Tapping Screws with Flange
D4 x 16 Tapping Screws with Flange
D4 x 20 Tapping Screws with Flange
D4 x 20 Tapping Screws
M4 x 10 Machine Screws
M4 x 12 Machine Screw
Pillar Terminals with terminal screws......... 0.39 ± 0.1 N×m (4 ± 1 kgf-cm)
Slide Switch with terminal screws .............. 0.39 ± 0.1 N×m (4 ± 1 kgf-cm)
1-4. Wiring and Connecting Diagrams
Perform the wiring as follows.
A
With the internal wire pointed at A, insert the Tab Terminal (blue) [7] <7>.
With the internal wire pointed at A, insert the Internal Wire (brown) [6] <6>.
A
a B
With the internal wire pointed at B, insert the Internal Wire (blue) [26] <26>.
With the internal wire pointed at B, insert the Tab Terminal (brown) [27] <27>.
b
B
Fig. 6 Internal Wires Assembly Positions (View from Commutator Side)
Tab Terminal [7] <7> Press the Tab Terminal deeply into position.
Internal Wire [6] <6> Press the Tab Terminal deeply into position.
A-A
B-B
Press the Tab Terminal deeply into position. Internal Wire [26] <26>
Press the Tab Terminal deeply into position. Tab Terminal [27] <27>
Fig. 7 Inserting Direction of Internal Wires
−#3 −
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