Hitachi DH 40MC Service Manual
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Hitachi DH 40MC Service Manual

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PRODUCT NAME
Hitachi Rotary Hammer
DH 40MC
Model
CONTENTS
REPAIR GUIDE -----------------------------------------------------------------------------------------------------------------1
1. Precautions on disassembly and reassembly ------------------------------------------------------------1
• Disassembly ----------------------------------------------------------------------------------------------------1
• Reassembly -----------------------------------------------------------------------------------------------------4
• Lubrication points and types of lubricant -----------------------------------------------------------------8
• Tightening torque ----------------------------------------------------------------------------------------------9
• Insulation test ---------------------------------------------------------------------------------------------------9
• No-load current value -----------------------------------------------------------------------------------------9
• Connecting diagram ---------------------------------------------------------------------------------------- 10
STANDARD REPAIR TIME (UNIT) SCHEDULES ------------------------------------------------------------------- 11
CONFIDENTIAL
LIST No.
DH 40MC: F440
Dec. 2016
Page
Overseas Sales Division
D

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  • Page 1: Table Of Contents

    CONFIDENTIAL LIST No. DH 40MC: F440 Dec. 2016 PRODUCT NAME Hitachi Rotary Hammer DH 40MC Model CONTENTS Page REPAIR GUIDE -----------------------------------------------------------------------------------------------------------------1 1. Precautions on disassembly and reassembly ------------------------------------------------------------1 • Disassembly ----------------------------------------------------------------------------------------------------1 • Reassembly -----------------------------------------------------------------------------------------------------4 • Lubrication points and types of lubricant -----------------------------------------------------------------8 •...

  • Page 2: Repair Guide

    Otherwise, the motor may run suddenly and you could get injured. [Bold] numbers in the description below correspond to the item numbers in the parts list and exploded assembly diagram for the Model DH 40MC. Disassembly 1. Disassembly of the tool retainer •...
  • Page 3 Fig. 3 • Removing the second hammer and striker [33] [37] [32] [28] [31] [30] [39] [22] [40] [41] [26] [25] [24] [85] [34] [38] [36] [47] [48] (2) Removing the piston ass’y • Remove the Hex. Socket Hd. Bolt M5 [110] from the Crank Cover [111]. Detach the Crank Cover [111] and the assembly of the Lever Shaft Holder [116] from the Crank Case Ass'y [91].
  • Page 4 (3) Removing the first gear and crank shaft • Remove the Hood [126] from the Crank Case Ass'y [91] by removing the Hex. Socket Hd. Bolt M5 x 12 [127] from the Hood [126]. • Remove the Seal Lock Hex. Socket Hd. Bolt M6 x 20 [109], Seal Lock Hex. Socket Hd. Bolt M6 x 45 [92], Hex.

  • Page 5: Reassembly

    Reassembly Reassembly can be accomplished by reversing the disassembly procedure. However, special attention should be given to the following items. 1. Reassembly of the hammering mechanism (1) Mounting the first gear and crank shaft • Press-fit Oil Seal (B) [90] to the Crank Case Ass'y Fig.
  • Page 6 (3) Mounting the cylinder and retainer sleeve • Mount the Retainer Damper Washer [26], Damper Sleeve [25], and Retainer Damper (B) [24] to the Retainer Sleeve [28] in this order, while aligning the rounded surface of the Retainer Damper Washer [26] with the rounded surface of the Retainer Sleeve [28].
  • Page 7 • Apply Hitachi Motor Grease No. 29 to the O-ring (S-18) [115], and then attach the O-ring to the Change Lever [112]. Insert the Lever Spring [113] into the change lever hole. • Apply Hitachi Motor Grease No. 29 to the Steel Ball D4.76 [114] and place it into the concave portion of the Lever Shaft Holder [116].
  • Page 8 (6) Mounting the crank cover • Insert the stepped portions of the Change Plate [119] into the notches of the Slider [42]. NOTE: Be careful of the inserting direction. See the figure below. • Mount the Cylinder O-ring [117] to the outer diameter portion on the bottom of the Lever Shaft Holder [116].

  • Page 9: Lubrication Points And Types Of Lubricant

    • Fill a total of 20 g of Hitachi Motor Grease No. 29 in the Crank Case Ass'y [91] on the First Gear [123] side and the Gear Cover [108] side. • Fill a total of 5 g of Hitachi Motor Grease No. 29 in the slotted groove and the 6 mm dia. holes of the Gear Holder [102].

  • Page 10: Tightening Torque

    Tightening torque CAUTION: Be sure to apply TB1401 screw locking agent to the threads of the following screws and bolts before tightening. Otherwise, the screw or bolt loosened by vibration may cause damage to the tool body. Tightening torque Item No. Part name used N•m...

  • Page 11: Connecting Diagram

    Connecting diagram Fig. 14 • Connecting diagram <For the USA, Canada, Mexico, and Panama (120 V)> Switch [78] Stator Ass'y [ Connector [68] [74] Armature Ass'y [70] Cord Stator Ass'y [ Pillar Terminal [67] <For Taiwan, Australia, New Zealand, Europe, South Africa, Turkey, Vietnam, Russia, China, and Korea> Switch [78] Stator Ass'y [ Choke coil...

  • Page 12: Standard Repair Time (Unit) Schedules

    STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL 10 min. 20 min. 30 min. 40 min. 50 min. 60 min. Work Flow DH 40MC Housing Ass'y Stator Ass'y Handle Handle Cover Switch Gear Cover Cord Armature Cord Armor Ball Bearing 6201DD...
  • Page 13 LIST NO. F440 ROTARY HAMMER 2016 · 12· 7 Model DH 40MC (E1)
  • Page 14 PARTS DH 40MC ITEM DESCRIPTION REMARKS CODE NO. USED 371151 FRONT CAP 331540 STOPPER RING 371138 RETAINER WASHER 371152 RETAINER DAMPER (A) 330209 SIDE HANDLE 337577 WING BOLT 949859 ROLL PIN D2 X 8 (10 PCS.) 371135 MOUNT 949556 NUT M6 (10 PCS.)
  • Page 15 PARTS DH 40MC ITEM DESCRIPTION REMARKS CODE NO. USED 371123 STATOR HOLDER 338755 RUBBER BUSH 930703 BRUSH TERMINAL 340963C STATOR ASS'Y 110V INCLUD.53 340963D STATOR ASS'Y 120V INCLUD.53 340963K STATOR ASS'Y 127V INCLUD.53 340963M STATOR ASS'Y 220V INCLUD.53 340963L STATOR ASS'Y 220V INCLUD.53 FOR CHN...
  • Page 16 PARTS DH 40MC ITEM DESCRIPTION REMARKS CODE NO. USED 371129 HANDLE 371128 TRIGGER 371171 SWITCH 371130 HANDLE COVER 307028 TAPPING SCREW (W/FLANGE) D4 X 25 (BLACK) 980063 TERMINAL 930804 TERMINAL M4.0 (10 PCS.) FOR USA,CAN,MEX,PAN (120V),GBR (110V) 371149 INTERNAL WIRE...

  • Page 17: Standard Accessories

    PARTS DH 40MC ITEM DESCRIPTION REMARKS CODE NO. CODE NO. USED 371143 SEAL PACKING 371132 HOOD 998471 HEX. SOCKET HD. BOLT (W/FLANGE) M5 X 12 STANDARD ACCESSORIES ITEM DESCRIPTION REMARKS CODE NO. USED 371122 CASE 981840 GREASE (A) FOR HAMMER.HAMMER DRILL (30G)

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