Hitachi DH 40MR Technical And Service Manual
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Hitachi DH 40MR Technical And Service Manual

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MODEL
DH 40MR
POWER TOOLS
D
TECHNICAL DATA
ROTARY HAMMER
AND
DH 40MR
SERVICE MANUAL
LIST No. E467
Sep. 2002
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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Summary of Contents for Hitachi DH 40MR

  • Page 1 MODEL DH 40MR POWER TOOLS TECHNICAL DATA ROTARY HAMMER DH 40MR SERVICE MANUAL LIST No. E467 Sep. 2002 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT...
  • Page 2 REMARK: Throughout this TECHNICAL DATA AND SERVICE MANUAL, a symbol(s) is(are) used in the place of company name(s) and model name(s) of our competitor(s). The symbol(s) utilized here is(are) as follows: Competitors Symbols Utilized Model Name Company Name GBH5-40DE BOSCH TE55 HILTI HR4000C...

  • Page 3: Table Of Contents

    7-2. Caution Plate ..........................12 8. REFERENCE INFORMATION ......................12 8-1. Grease Replacement ........................12 8-2. O-Ring Replacement ........................12 8-3. Structure of DH 40MR Rotary Hammer ..................13 9. REPAIR GUIDE ..........................18 9-1. Disassembly ..........................18 9-2. Reassembly ..........................20 9-3.

  • Page 4: Product Name

    Hitachi Rotary Hammer, Model DH 40MR 2. MARKETING OBJECTIVE The Model DH 40MR is an upgraded version of the current Models DH 40MA and DH 40MB, which feature the use of SDS-max shank tools. The performance, durability and operability are greatly improved. With this competitive Model DH 40MR, we aim to enhance the share of SDS-max type rotary hammers.

  • Page 5: Selling Point Descriptions

    4-1-1. High drilling speed with low vibration and noise level The drilling speed is 10 % faster than that of similar products thanks to efficient striking energy transmission and speed setting. Even so, the Model DH 40MR produces lower vibration and noise levels than those of similar products.

  • Page 6: Specifications

    "Neutral". 4-1-7. Needle-pin type slip clutch The Model DH 40MR is equipped with a needle-pin type slip clutch for higher slip torque accuracy and enhanced safety (same as the Model DH 40MA). 5. SPECIFICATIONS 5-1.

  • Page 7: Optional Accessories

    5-2. Optional Accessories 1. Drilling work for through-holes (Rotation + Hammering) (1) Drill bit (SDS max shank) Outer diameter Outer diameter Over length Code No. Over length Code No. (mm) (mm) (mm) (mm) 313448 313456 (5/8") 340 (13-3/8") (5/8") 540 (21-1/4") 313449 313457 (3/4")
  • Page 8 3. Boring work for large-diameter holes (Rotation + Hammering) (1) Guide plate (3) Core bit (4) Core bit shank (SDS max shank) (2) Center pin (1) Guide plate Core bits with outer diameter of 32, 35, 38, 45, 50, 54, 60, 64, 70, 75, 79, 94, 100, 105 mm (1-1/4", 1-3/8", 1-1/2", 1-3/4", 2", 2-1/8", 2-3/8", 2-2/1", 2-3/4", 2-15/16", 3-1/8", 3-1/16", 3-15/16", 4-1/8") [Guide plate is not used with core bits with outer diameter of 25 mm (1") and 29 mm (1-1/8")] (2) Center pin...
  • Page 9 5. Chemical anchor holes drilling work (Rotation + Hammering) (1) Chemical anchor adapter (Socket) (SDS max shank) Socket square size Code No. 12.7 mm (1/2") 313469 19.0 mm (3/4") 313470 6. Demolition work (Hammering) (1) Bull point (SDS max shank) Overall length Code No.
  • Page 10 10. Surface roughing work (Hammering) (2) Shank (SDS max shank) (1) Bushing tool Code No. Overall length Code No. 313477 220 mm (8-21/32") 313479 11. Tamping work (Hammering) (2) Shank (SDS max shank) (1) Rammer Code No. Overall length Code No. 313478 220 mm (8-21/32") 313479...

  • Page 11: Comparisons With Similar Products

    6. COMPARISONS WITH SIMILAR PRODUCTS 6-1. Specification Comparisons Maker Model • Hitachi Hitachi DH 40MR DH 40MA/MB Item Drill bit dia. (mm) (1-9/16") (1-9/16") (1-1/4") (1-9/16") (1-9/16") Capacity Core bit dia. (mm) (4-1/8") (4-1/8") (3-17/32") (4-1/8") (4-1/8") 1,100 Power input...

  • Page 12: Drilling Speed Comparisons

    6-2. Drilling Speed Comparisons Drilling speed varies considerably depending on the work conditions. Use the factory test results shown in Fig. 1 for comparison purposes only. * Note that the data marked with asterisks are test results using drill bits which are beyond the tool's rated capacity.

  • Page 13: Chiseling Performance Comparison

    B increases only the number of hammering without changing the weight of the striker (that is, hammering energy). The Model DH 40MR realizes self- chiseling in addition to self-drilling (4-1-2. Self-drilling (Good feeling)).

  • Page 14: Drilling Speed And Quantity Of Body Jumping

    Pushing force: 100 N 6-5. Drilling Speed and Quantity of Body Jumping The graph shown in Fig. 4 illustrates the relationship between drilling speed and quantity of body jumping. The quantity of body jumping is less than the similar products and the working tool quickly penetrates into the workpiece.

  • Page 15: Precautions In Sales Promotion

    7. PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Model DH 40MR Rotary Hammer by all of our customers, it is very important that at the time of sale the salesperson carefully ensures that the buyer seriously recognizes the importance of the contents of the Handling Instructions, and fully understands the meaning of the precautions listed on the Caution Plate attached to each tool.

  • Page 16: Reference Information

    8-1. Grease Replacement The striking portion and the speed reduction portion of the Model DH 40MR respectively use different types of grease. It is not necessary to replenish the grease unless the tool is disassembled for repair or there is grease leakage due to a damaged seal.
  • Page 17 Torque transmission Armature revolution is transmitted to the second gear to rotate the bevel gear via the slip mechanism between the second gear and bevel pinion axes. Rotation of the bevel gear is then transmitted to the cylinder keyed thereto through the clutch. Cylinder rotation is conveyed to the retainer sleeve coupled together by means of four needle pins and, then to the drill bit inserted into the retainer sleeve by way of three key rails and two needle rollers which couple them together.
  • Page 18 Slip clutch mechanism The slip clutch mechanism is described below with reference to Fig. 7. The bevel pinion and the gear holder are coupled together by the key and press-fitting. Spring (C) and needle pins are housed in elongated grooves of the gear holder. The needle pin is pressed against the inner face of second gear by spring (C) to allow idle rotation of the second gear relative to the gear holder.
  • Page 19 Handle and side handle The handle section is of a two-layer structure. The base is made of glassfiber-reinforced plastic and the outside layer is soft resin. They are molded in one piece. The side handle also has a two-layer structure. The base is made of glassfiber-reinforced plastic base with a steel nut and the outside layer is soft resin.
  • Page 20 (for drilling) and bull points (for chiseling) have the same Cylinder shape. When chiseling or chipping with the Model DH 40MR, it is necessary to stop the rotation and choose the "Hammering only" mode by mean of the change lever to lock the working tool against rotation.

  • Page 21: Repair Guide

    9. REPAIR GUIDE The numbers in [Bold] correspond to the item numbers in the Parts List and exploded assembly diagrams. 9-1. Disassembly (1) Disassembly of the tool holder Pull the Grip [2] in the arrow direction to the full as shown in Fig.
  • Page 22 Lock Sleeve [26] Retainer Sleeve [17] Clutch [31] Cylinder [24] Bevel Gear [35] Piston [32] Connecting Rod [34] Second Hammer [19] Striker [29] Cylinder Crank Case [49] Crank Shaft [43] Bevel Pinion [50] Fig. 16 (3) Disassembly of the first gear and the crank shaft Cylinder Crank Case Remove grease from the Connecting Rod [34] side and...

  • Page 23: Reassembly

    (4) Disassembly of the slip clutch Press the end surface of the Bevel Pinion with a Remove the Ball Bearing 629VVC2PS2L [61] with a hand press. bearing puller. Place the assembly on a sleeve-type support facing Washer (A) [55] downward as shown in Bevel Pinion [50] Fig.
  • Page 24 Retaining Ring Cylinder Crank Case [49] Crank Pin for D10 Shaft [42] Piston Pin [33] Mark Crank Shaft [43] Connecting Rod [34] O-ring [30] Piston [32] Fig. 21 (3) Reassembly of the cylinder and the retainer sleeve Press-fit the Retainer Sleeve [17] into the Ball Bearing 6007DDUAV2S [14]. Secure it with the Retaining Ring for D35 Shaft [13].
  • Page 25 Needle Bearing (M661) [65], the pinion portion of the Armature [82] and the Needle Roller D8 x 20 [16]. Fill 30 g of the Hitachi Motor Grease No. 29 in the Cylinder Crank Case [49] on the First Gear [64] side and the Gear Cover [66] side.

  • Page 26: Screw Locking Agent Tb1401

    (7) Oil seal and others Take care not to scratch or cut Oil Seal (A) [52] and Oil Seal (B) [48] of the Cylinder Crank Case [49], Oil Seal [10] and O-ring (1AS-60) [9] of the Front Cover [8], O-ring (C) [18] of the Second Hammer [19], Rubber Seal [41] of the Crank Cover [39] and the O-ring [30] of the Piston [32] and the Striker [29].

  • Page 27: Internal Wiring

    9-5. Internal Wiring Wiring diagram for products without noise suppressor Switch Stator Controller Armature Plug circuit ass'y Connector Wiring diagram for products with noise suppressor Switch Stator Controller circuit Armature ass'y (include Plug noise suppressor) Pillar terminal Mounting diagram for products with noise suppressor Case (B) Control circuit ass'y (include noise suppressor)

  • Page 28: Insulation Tests

    9-6. Insulation Tests On completion of disassembly and repair, measure the insulation resistance and dielectric strength. Insulation resistance: 7 MΩ or more with DC 500 V Megohm Tester Dielectric strength: AC 4,000 V/1 minute, with no abnormalities ....220 V --- 240 V (and 110 V for U.K.

  • Page 29: Standard Repair Time (Unit) Schedules

    10. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed Work Flow DH 40MR Housing Ass'y Gear Cover Stator Ass'y Needle Bearing Handle Cover Switch (C) Armature Cord Ball Bearing (6201DD) Tail Cover Ball Bearing (608VV) Crank Cover Washer (A)
  • Page 30 LIST NO. E467 ELECTRIC TOOL PARTS LIST ROTARY HAMMER 2002 • • Model DH 40MR (E1)
  • Page 31 PARTS DH 40MR ITEM CODE NO. DESCRIPTION REMARKS USED 321-306 FRONT CAP 321-305 GRIP 318-590 STOPPER RING 321-304 NEEDLE HOLDER 321-303 RETAINER SPRING 321-302 SPRING HOLDER (A) 981-942 SEAL LOCK HEX. SOCKET HD. BOLT M6X25 321-300 FRONT COVER 956-996 O-RING (1AS-60)
  • Page 32 PARTS DH 40MR ITEM CODE NO. REMARKS DESCRIPTION USED 313-050 OIL SEAL (A) 600-2DD BALL BEARING 6002DDCMPS2L 313-058 WASHER 313-053 WASHER (A) 321-281 GEAR HOLDER 321-282 SPRING (C) 320-343 NEEDLE 321-280 SECOND GEAR 321-283 SPACER 629-VVM BALL BEARING 629VVC2PS2L 321-277 SLIP CLUTCH ASS’Y...
  • Page 33 PARTS DH 40MR ITEM CODE NO. DESCRIPTION REMARKS USED 930-703 BRUSH TERMINAL 321-322 VINYL TUBE 321-318 HOUSING ASS’Y INCLUD.92,93 321-317 CASE (B) 321-326 CONTROLLER CIRCUIT 110V 321-328 CONTROLLER CIRCUIT 120V 321-327 CONTROLLER CIRCUIT 220V-240V 317-113 INTERNAL WIRE EXCEPT FOR HKG,USA,CAN...

  • Page 34: Optional Accessories

    DH 40MR STANDARD ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 321-325 CASE 981-840 GREASE (A) FOR HAMMER.HAMMER DRILL (30G) 943-277 HEX. BAR WRENCH 3MM 944-458 HEX. BAR WRENCH 4MM 944-459 HEX. BAR WRENCH 5MM OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION...
  • Page 35 DH 40MR OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 956-000 CORE BIT 38MM INCLUD.633 956-001 GUIDE PLATE (FOR CORE BIT 38MM) 955-154 CORE BIT 45MM INCLUD.635 955-166 GUIDE PLATE (FOR CORE BIT 45MM) 955-155 CORE BIT 54MM INCLUD.637 955-167...

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