Hitachi WR 25SE Service Manual page 9

(1) Apply Nippeco SEP-3A grease (Code No. 930035 (100 g)/930038 (2.5 kg)) to the following:
• Pinion tooth flanks of Rotor Ass'y (C) [30]
• Tooth flanks of the Ring Gear [23]
• Two Needle Rollers [19]
• Tooth flanks and inner circumference of the Idle Gear Set (2 pcs.) [21]
(2) Apply Doubrex 251 grease to the following:
• Between Hammer (C) [14] and Spring Sheet (C) [18]
• Inside of Hammer Case (C) Ass'y [6]
• Spindle (C) [20]: Cam groove, sliding portion, and engaging portions with Anvil (C) [12] and Metal (A)
[25]
• Cam groove and raised portions of Hammer (C) [14]
• Anvil (C) [12]: 13 mm dia. hole, sliding portion with Washer (B) [11], claw, and sliding portion with the
O-ring
• Two Steel Balls D10.3 [13]
• Thirty-five Steel Balls D4.76 [15]
• Both end surfaces of Washer (C) [9] and Damper (C) [10]
• Seal Lock Screw (W/Sp. Washer) M5 x 12 [4] ------------------------- 3.4 ± 0.7 N•m (35 ± 7 kgf•cm)
• Hex. Socket Hd. Bolt (W/Washers) M5 x 20 [44] ---------------------- 5.9 ± 1.5 N•m (60 ± 15 kgf•cm)
• Seal Lock Hex. Socket Hd. Bolt M6 x 50 [1] ---------------------------- 10.8 ± 1.0 N•m (110 ± 10 kgf•cm)
• Tapping Screw (W/Flange) D4 x 20 (Black) [45] ----------------------- 1.8 ± 0.3 N•m (18 ± 3 kgf•cm)
• Hex. Hd. Tapping Screw D5 x 70 [32] ------------------------------------ 2.9 ± 0.5 N•m (30 ± 5 kgf•cm)
• Tapping Screw (W/Flange) D4 x 16 [41] --------------------------------- 1.8 ± 0.3 N•m (18 ± 3 kgf•cm)
Check the following after reassembly:
(1) Operate the Switch [38] and check that the switch moves smoothly and the switch operations (ON,
OFF, forward and reverse) are normal.
(2) Press the Switch [39] in "R" direction and slowly release the switch. Check that the switch returns to
the original position. Then press the Switch [38] in "L" direction and slowly release the switch. Check
that the switch returns to the original position.
(3) Check that the rotational direction of Anvil (C) [12] matches the direction of rotation made when you
press the Switch [38]. When the Switch [38] is set to the "R" position, Anvil (C) [12] must rotate
clockwise as viewed from the rear (opposite to Anvil (C) [12].)
On completion of reassembly after repair, measure the insulation resistance and conduct the dielectric
strength test between the plug pins and the outside metallic parts such as Anvil (C) [12].
Insulation resistance:
Dielectric strength:
Application of lubricant
Screw tightening torque
Checking after reassembly
Insulation test
7 M or more
2,500 V for 1 minute --------------------------------------- 110 V to 120 V
4,000 V for 1 minute --------------------------------------- 220 V to 240 V
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