Hitachi G 12SA4 Service Manual page 6

Disc grinders 115 mm 4-1/2", 125 mm 5"
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(4) Be sure to soak the inner diameter of the Felt
Packing [9]<9> with machine oil. Otherwise, its dust
sealing function will fail to work properly, resulting in
premature damage to the ball bearing of the Packing
Gland [6]<6>. Wipe the Felt Packing [9]<9> lightly
with a rag before assembling.
(5) Mount the Fan Guide [29]<29> in proper direction by
matching the gate mark of the Fan Guide [29]<29>
with the "N" mark of the Housing [34]<34> as show
in Fig. 7.
(6) Do not catch the pigtail of the Carbon Brush (1 Pair) [38]<38> in the Tail Cover [50]<50> when mounting
the Tail Cover [50]<50>. Check that the pigtail is in its proper position as shown in Fig. 8 before mounting
the Tail Cover [50]<50>.
Fig. 8
Proper
z
(7) Tighten three of the four Seal Lock Screws (W/Sp. Washer) M4 x 14 [7]<7> except the one for securing
the Lever Holder [8]<8>. Mount the Lever [27]<27> and Retaining Ring D4 [28]<28> to the Lever Holder
[8]<8>. Hook the Spring [26]<26> on the Lever [27]<27>. Then tighten the remaining Seal Lock Screw
(W/Sp. Washer) M4 x 14 [7]<7>.
(8) Mount the Pushing Button Switch [40]<40> according to the
following steps.
• Attach the Cord [52]<52> to the Pushing Button Switch
[40]<40>.
• Mount the Pushing Button Switch [40]<40> while pressing the
pressing point of the Pushing Button Switch [40]<40> as
shown in Fig. 9.
• Mount the Ferrite Core [42]<42> and Cord [52]<52> as shown
in Fig. 10.
Fig. 10
Fig. 7
Gate mark
Check that the pigtail is not put on
the Brush Holder [36]<36> before
mounting the Tail Cover [50]<50>.
-5-
[29]<29>
"N" mark
Improper
Fig. 9
[34]<34>
1
2

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