Hitachi DH 50MRY Technical Data And Service Manual
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Hitachi DH 50MRY Technical Data And Service Manual

Hitachi DH 50MRY Technical Data And Service Manual

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PRODUCT NAME
Hitachi Rotary Hammer
DH 50MRY, DH 50MR
Model
MARKETING OBJECTIVE
The new Model DH 50MRY is capable of drilling maximum 50-mm diameter holes into concrete and compatible
with SDS max shank tools. Equipped with the low vibration mechanism, the performance, durability and operability
are greatly improved. The Model DH 50MRY is released with the low-vibration hammer drill Model
DH 40MRY as our low-vibration series.
The new Model DH 50MR is an upgraded version of the current Model DH 50MB. The performance, durability and
operability are also improved greatly even though it is not equipped with the low vibration mechanism.
APPLICATIONS
Drilling holes in concrete and drilling anchor holes.
Demolishing and chiseling of concrete. Edging, gravel road digging, compacting and tamping, grooving,
cutting, stripping and roughing, etc.
SELLING POINTS
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
<New features>
Equipped with a pendulum dynamic absorber as
the low vibration mechanism (Model DH 50MRY
only)
Fastest drilling speed and greatest chiseling
performance in the class
<Same features as the conventional models>
Vibration-absorbing handle
Constant speed with variable speed control
Easy-to-operate and double-molded switch handle
and side handle
Variable lock mechanism for easy working-angle
adjustment of chisels etc.
Needle-pin type slip clutch
International Sales Division
LIST Nos.
DH 50MRY: E499
DH 50MR: E498
Sep. 2007
D

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  • Page 1 Model MARKETING OBJECTIVE The new Model DH 50MRY is capable of drilling maximum 50-mm diameter holes into concrete and compatible with SDS max shank tools. Equipped with the low vibration mechanism, the performance, durability and operability are greatly improved. The Model DH 50MRY is released with the low-vibration hammer drill Model DH 40MRY as our low-vibration series.
  • Page 2 REMARK: For more information about HANDLING INSTRUCTIONS, visit our website at: http://www.hitachi-koki.com/manual_view_export/ 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:...

  • Page 3: Table Of Contents

    COMPARISONS WITH SIMILAR PRODUCTS------------------------------------------------------------------------- 9 1. Specifications comparisons ---------------------------------------------------------------------------------------------------------- PRECAUTIONS IN SALES PROMOTION------------------------------------------------------------------------------10 1. Safety instructions ---------------------------------------------------------------------------------------------10 REFERENCE MATERIALS-------------------------------------------------------------------------------------------------11 REPAIR GUIDE----------------------------------------------------------------------------------------------------------------12 1. Precautions in disassembly and reassembly ------------------------------------------------------------12 STANDARD REPAIR TIME (UNIT) SCHEDULES--------------------------------------------------------------------19 Assembly diagram for DH 50MRY Assembly diagram for DH 50MR...

  • Page 4: Selling Point Descriptions

    Fastest drilling speed and greatest chiseling performance in the class* We conducted digital engineering to determine the optimal impact specifications. As a result, the Models DH 50MRY and DH 50MR offer the fastest drilling speed and greatest chiseling performance in the class. *Based on our own research...
  • Page 5 Vibration-isolating rubber Dial type, constant speed with variable speed control The Model DH 50MRY/DH 50MR is equipped with a built-in electronic control circuit that can adjust the number of hammering steplessly between 1,050 and 2,150 min with the dial. Even though...
  • Page 6 “Neutral.” Needle-pin type slip clutch The Model DH 50MRY/DH 50MR is equipped with a needle-pin type slip clutch for higher slip torque accuracy and enhanced safety (same as the Model DH 50MB).

  • Page 7: Specifications

    SPECIFICATIONS 1. Specifications Model DH 50MRY DH 50MR Drill bit (Max. dia.): 50 (2”) Capacity Core bit (Max. dia.): 160 (6-1/4”) Voltage Current 14.0 12.8 Power input 1,400 Materials : Aluminum alloy die casting (Cylinder case) Nylon resin (Handle (A). (B), tail cover, hood,...

  • Page 8: Optional Accessories

    2. Optional accessories Drilling work for through-hole drilling (Rotation + Impact) Drill bit (SDS max shank) D mm L mm Code No. D mm L mm Code No. 16 (5/8”) 340 (13-3/8”) 313448 16 (5/8”) 540 (21-1/4”) 313456 19 (3/4”) 340 (13-3/8”) 313449 19 (3/4”)
  • Page 9 Boring work for large-diameter holes (Rotation + Hammering) (2) Core bit (3) Core bit shank (1) Center pin (Guide plate) (SDS max shank) (2) Core bit (1) Center pin (3) Core bit shank (SDS max) D mm Guide plate l mm Code No.
  • Page 10 Crushing work (Hammering mode) Bull point (SDS max shank) L mm Code No. 280 (11”) 313471 400 (15-3/4”) 313472 Groove digging and edging (Hammering mode) Cold chisel (SDS max shank) L mm Code No. 280 (11”) 313473 400 (15-3/4”) 313474 Cutting and stripping (Asphalt cutting etc.) (Hammering mode) Cutter (SDS max shank) L mm...
  • Page 11 (11) Tamping work (Hammering) Rammer Shank (SDS max shank) L mm Code No. l mm Code No. 150 (5-29/32”) 313478 220 (8-21/32”) 313479 (12) Syringe (for chip removal) Syringe Code No. Bellows 318085 Blow-out bulb 320859 (13) Grease 30 g (1 oz) Tube 500 g (1.1 lbs.) Can Code No.

  • Page 12: Comparisons With Similar Products

    COMPARISONS WITH SIMILAR PRODUCTS 1. Specifications comparisons (Superior specifications: Maker HITACHI Model name DH 50MRY DH 50MR DH 50MB Drill bit dia. (2”) (2”) (2-1/16”) (2-1/16”) Capacity Core bit dia. (6-1/4”) (6-1/4”) (6-1/4”) (5-29/32”) Power input 1,400 1,400 1,500 1,500...

  • Page 13: Precautions In Sales Promotion

    1. Safety instructions In the interest of promoting the safest and most efficient use of the Models DH 50MRY/DH 50MR Rotary Hammers by all of our customers, it is very important that at the time of sale, the salesperson carefully...

  • Page 14: Reference Materials

    30 g. Never use the special grease for the hammering section in the gear change section. Otherwise, the special grease will leak into the motor section and cause subsequent troubles. Periodically change the grease in the slip clutch. Fill the slip clutch with Hitachi Motor Grease No. 29 to the full. REFERENCE MATERIALS Refer to the Technical Data and Service Manual for the following model.

  • Page 15: Repair Guide

    1. Precautions in disassembly and reassembly The [Bold] numbers in the description below correspond to the item numbers in the Parts List and the exploded assembly diagram for the Models DH 50MRY/DH 50MR. Disassembly 1. Disassembly of the tool retainer Pull the Grip [2] in the arrow direction to full as shown in Fig.
  • Page 16 Fig. 3 Lock Spring [27] Damper Holder [24] Retainer Sleeve [19] Cylinder [26] Striker [31] Second Hammer [21] Weight ass’y Weight [88] Damper Washer [22] Clutch Spring [30] Damper [23] Spring Holder (B) [29] Leaf Spring [93] Needle Pin D8 x 6 [25] Piston [35] Retaining Ring for D12 Shaft [78] Cylinder Case [37]...
  • Page 17 Reassembly Reassembly can be accomplished by following the disassembly procedure in reverse. However, special attention should be given to the following items. 1. Reassembly of the hammering mechanism and the vibration reduction mechanism (a) First Gear [116] and Crank Shaft [79] Fig.
  • Page 18 (d) Vibration reduction mechanism Apply Hitachi Motor Grease No. 29 to the Washer [89] and adhere it to the end face of the hole portion of the Weight [88]. Insert the Weight [88] into the Base [91] and insert the Weight Pin [92]. At this time, apply Hitachi Motor Grease No.

  • Page 19: Tightening Torque

    Application of Hitachi Motor Grease No. 29 Apply Hitachi Motor Grease No. 29 to the pinion portions of the Needle Bearing (M661) [118] and the Armature Ass’y [128], Needle Rollers D8 x 20 [18], Leaf Spring [93] and Weight Pin [92].

  • Page 20: Internal Wiring

    Seal Lock Hex. Socket Hd. Bolt M4 x 12 [43] for mounting the change lever -------------------------- 4.41 ± 0.49 N·m (45 ± 5 kgf·cm) Tapping Screw (W/Flange) D5 ------------------------ 2.94 ± 0.49 N·m (30 ± 5 kgf·cm) Tapping Screw (W/Flange) D4------------------------- 1.96 ± 0.49 N·m (20 ± 5 kgf·cm) 4.

  • Page 21: Insulation Tests

    (3) Mounting diagram for products with noise suppressor Lead wires of switch and cord Case (A) Housing Control circuit ass’y (including noise suppressor) Lead wire of stator Lead wire of noise suppressor Tail cover 5. Insulation tests On completion of disassembly and repair, measure the insulation resistance and dielectric strength. Insulation resistance : 7 M or more with DC 500 V megohm tester Dielectric strength : AC 4,000 V/1 minute, with no abnormalities --- 220 V –...

  • Page 22: Standard Repair Time (Unit) Schedules

    STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL Fixed Work Flow DH 50MRY Housing Ass’y Handle Stator Ass’y (A).(B) Set Switch (B) Cord Gear Cover Cord Armor Needle Bearing Tail Cover Hood Armature Ass’y Ball Bearing Crank Cover (6202DD) Ball Bearing...
  • Page 23 STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL Fixed Work Flow DH 50MR Housing Ass’y Handle Stator Ass’y (A).(B) Set Switch (B) Cord Gear Cover Cord Armor Needle Bearing Tail Cover Hood Armature Ass’y Ball Bearing Crank Cover (6202DD) Ball Bearing (6201VV) General assembly Control...
  • Page 24 Hitachi Power Tools LIST NO. E499 ELECTRIC TOOL PARTS LIST ROTARY HAMMER 2007 • • Model DH 50MRY (E1)
  • Page 25 PARTS DH 50MRY ITEM CODE NO. DESCRIPTION REMARKS USED 321-306 FRONT CAP 328-900 GRIP 318-590 STOPPER RING 328-899 NEEDLE HOLDER 313-419 RETAINER SPRING 318-589 SPRING HOLDER 985-479 SEAL LOCK HEX. SOCKET HD. BOLT M8X25 318-587 FRONT COVER 878-863 O-RING (S-70)
  • Page 26 PARTS DH 50MRY ITEM CODE NO. REMARKS DESCRIPTION USED 318-574 SIDE HANDLE 328-910 BACK COVER 998-485 HEX. SOCKET HD. BOLT (W/FLANGE) M5X14 318-575 HANDLE HOLDER 328-920 HANDLE (A).(B) SET 318-576 HANDLE BOLT 971-786 STOPPER ROD 328-909 HOOD HITACHI LABEL 998-471 HEX.
  • Page 27 PARTS DH 50MRY ITEM CODE NO. DESCRIPTION REMARKS USED 328-904 WEIGHT PIN 328-905 LEAF SPRING 328-907 WEIGHT BUMPER 328-906 SPRING HOLDER 990-079 SEAL LOCK HEX. SOCKET HD. BOLT M5X16 944-109 FEATHER KEY 3X3X8 328-873 BEVEL PINION 328-874 COLLAR 328-867 OIL SEAL...
  • Page 28 PARTS DH 50MRY ITEM CODE NO. DESCRIPTION REMARKS USED 999-074 CARBON BRUSH (AUTO STOP TYPE) (1 PAIR) 938-477 HEX. SOCKET SET SCREW M5X8 328-918 BEARING HOLDER 328-919 TAIL COVER 328-914 CASE (B) 328-911 CONTROLLER CIRCUIT 110V-115V 328-912 CONTROLLER CIRCUIT 120V...
  • Page 29 OPTIONAL ACCESSORIES DH 50MRY ITEM CODE NO. DESCRIPTION REMARKS USED 944-461 TAPER SHANK DRILL BIT D12.3X110 993-038 TAPER SHANK DRILL BIT D12.7X110 944-462 TAPER SHANK DRILL BIT D14.3X110 944-500 TAPER SHANK DRILL BIT D14.5X110 944-463 TAPER SHANK DRILL BIT D17.5X120 313-464 INCLUD.
  • Page 30 Hitachi Power Tools LIST NO. E498 ELECTRIC TOOL PARTS LIST ROTARY HAMMER 2007 • • Model DH 50MR (E1)
  • Page 31 PARTS DH 50MR ITEM CODE NO. DESCRIPTION REMARKS USED 321-306 FRONT CAP 328-900 GRIP 318-590 STOPPER RING 328-899 NEEDLE HOLDER 313-419 RETAINER SPRING 318-589 SPRING HOLDER 985-479 SEAL LOCK HEX. SOCKET HD. BOLT M8X25 318-587 FRONT COVER 878-863 O-RING (S-70) 318-588 OIL SEAL (NBR710) 318-586...
  • Page 32 HEX. SOCKET HD. BOLT (W/FLANGE) M5X14 318-575 HANDLE HOLDER 328-920 HANDLE (A).(B) SET 318-576 HANDLE BOLT 971-786 STOPPER ROD 328-909 HOOD HITACHI LABEL 998-471 HEX. SOCKET HD. BOLT (W/FLANGE) M5X12 NAME PLATE 328-707 TAPPING SCREW (W/FLANGE) D5X30 (BLACK) 980-750 GUIDE PLATE 980-727 HANDLE RUBBER 305-558...
  • Page 33 PARTS DH 50MR ITEM CODE NO. DESCRIPTION REMARKS USED 313-058 WASHER 318-552 WASHER (A) 318-554 GEAR HOLDER 329-095 SPRING (C) 313-057 NEEDLE PIN D6X6 328-875 SECOND GEAR 328-876 SPACER 629-VVM BALL BEARING 629VVC2PS2L 944-525 BEARING WASHER (C) 328-872 SLIP CLUTCH ASS’Y INCLUD.
  • Page 34 STANDARD ACCESSORIES DH 50MR ITEM CODE NO. DESCRIPTION REMARKS USED 981-840 GREASE (A) FOR HAMMER. HAMMER DRILL (30G) 328-921 CASE (PLASTIC) OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 308-471 GREASE FOR HAMMER. HAMMER DRILL (70G) 980-927 GREASE FOR HAMMER. HAMMER DRILL (500G) 320-859 SYRINGE (BLOW-OUT BULB TYPE) 318-085...
  • Page 35 OPTIONAL ACCESSORIES DH 50MR ITEM CODE NO. DESCRIPTION REMARKS USED 956-002 CORE BIT 64MM INCLUD. 643 956-003 GUIDE PLATE (FOR CORE BIT 64MM) 955-157 CORE BIT 79MM INCLUD. 645 955-168 GUIDE PLATE (FOR CORE BIT 79MM) 956-004 CORE BIT 94MM INCLUD.

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