Hitachi WR 16SE Repair Manual page 9

(1) Apply Nippeco SEP-3A grease to the following:
• Pinion tooth flanks of the Rotor Ass'y [25]
• Tooth flanks of the Ring Gear [19]
• Tooth flanks and inner circumference of the Idle Gear Set (2 pcs.) [18]
• Needle Roller [16]
(2) Apply Doubrex 251 grease to the following:
• 10 hole of Anvil (L) [6], metal sliding portion, and top of the pawl portion
• Steel Ball D6.35 [7]
• Metal oil groove of Hammer Case Ass'y [3]
• Hammer (A) [8] cam groove and pawl portions
• Spindle (A) [17] cam groove, sliding portion, and fitting joint with Anvil (L) [6]
• Steel Balls D3.97 [9] (29 pcs.)
• Both sides of Washer (A) [14]
• Seal Lock Hex. Socket Hd. Bolt M5 x 35 [2] ---------------------------- 8.82 ± 1.0 N•m (90 ± 10 kgf•cm)
• Tapping Screw (W/Flange) D4 x 20 (Black) [42] ----------------------- 2.45 ± 0.5 N•m (25 ± 5 kgf•cm)
• Truss Hd. Screw M4 (Black) [30] ------------------------------------------ 1.76 ± 0.4 N•m (18 ± 4 kgf•cm)
• Tapping Screw (W/Flange) D4 x 16 [37] --------------------------------- 1.96 ± 0.49 N•m (20 ± 5 kgf•cm)
Check the following after reassembly:
(1) Operate the Switch [32] and make sure that the switch moves smoothly and the switch operations (ON,
OFF, forward and reverse) are normal.
(2) Push the mode switch and confirm that the impact rate changes in four modes.
(3) Make sure the rotational direction of Anvil (L) [6] matches the direction of rotation made when you
press the Switch [32]. (When the Switch [32] is set to the (R) position, Anvil (L) [6] must rotate
clockwise as viewed from the rear (opposite to Anvil (L) [6].)
Upon completing disassembly and repair, measure the insulation resistance and conduct an insulation test
(dielectric strength test).
Insulation resistance: 7 M or more with 500 V DC megohm tester
Dielectric strength:
After no-load operation for 30 minutes, the no-load current value should be as specified below.
Voltage
Current max.
Application of lubricant
Screw tightening torque
Checking after reassembly
Insulation test
AC 2,500 V for 1 minute, with no abnormalities ----- 110 to 120 V
AC 4,000 V for 1 minute, with no abnormalities ----- 220 to 240 V
No-load current
110 V 120 V
1.5 A 1.5 A
220 V
0.7 A
-8-
230 V 240 V
0.7 A 0.7 A