Hitachi Rotary Hammer

Transcription

1 LIST No. F408 Dec PRODUCT NAME Hitachi Rotary Hammer Model DH 28PC MARKETING OBJECTIVE This product features a maximum bit diameter of 28 mm, the capability to drill holes in concrete and other hard materials, the mounting SDS-plus shank bits," and three modes (Rotation + Hammering, Rotation only, and Hammering only) that enable chipping and groove-cutting work. This 3-mode type of product offers improved drilling/chipping performance, as well as reduced product size and weight. This product together with the dustcollection type of product (DH 28PD) developed at the same time forms a continuous lineup of D-shaped handle rotary hammer drills in order to promote the sharing of these products. D APPLICATIONS (1) Rotation and hammering function Drilling anchor holes. Drilling holes in concrete, tile, brick and similar materials. Large hole boring with core bit. (2) Rotation only function Drilling holes in steel and wood (with chuck adapter). Tightening machine screws and wood screws (with chuck adapter). (3) Hammering only function Stripping mortar and tiles. Demolishing and chiseling of concrete. Grooving and cutting of bricks. SELLING POINTS [ NEW FEATURES ] Most compact body in its class Highest demolition performance in its class Equipped with a reversing switch [ SAME FEATURES AS CONVENTIONAL MODELS ] 3-mode changing and variable lock mechanism for easy working-angle adjustment of chisels, etc. Idle striking prevention mechanism with catchring method One push type of bit mounting Internal pressure adjustment mechanism Easy-to-operate and double-molded switch handle and side handle SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT. Sales Division

2 REMARK: For more information about HANDLING INSTRUCTIONS, visit our website at: 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: Symbols Utilized Company Name Competitors Model Name B BOSCH GBH3-28E C MAKITA HR2811F

3 CONTENTS Page SELLING POINTS SPECIFICATIONS Specifications Optional Accessories COMPARISON WITH SIMILAR PRODUCTS Comparison of Specifications Comparison of Drilling Speed PRECAUTIONS ON SALES PROMOTION Safety Instructions REFERENCE MATERIALS REPAIR GUIDE Precautions on Disassembly and Reassembly STANDARD REPAIR TIME (UNIT) SCHEDULES Assembly Diagram for DH 28PC

4 SELLING POINTS Most compact body in its class *Based on our own research By downsizing and optimizing the motor and mechanism components, Hitachi significantly reduced overall product length to achieve the most compact body in this class of product. Model HITACHI DH 28PC C B Full length (mm) B: 332 mm C: 320 mm HITACHI DH 28PC: 316 mm (for C: -4 mm, for B: -16 mm) HITACHI DH 28PC shape B: Outlined shape C: Outlined shape HITACHI DH 28PC, B: 208 mm (C: -17 mm) C: 225 mm -1-

5 *Based on our own Highest demolition performance in its class research Hitachi achieved the highest demolition performance in this class of product by optimizing the hammering properties. Comparison of chiseling amounts (Test results obtained at Hitachi factory) HITACHI DH 28PC 25.2 C Chiseling amount (kg/30 min.) * The chiseling amount is dependent upon test conditions. * C has no "Hammering" mode. Equipped with a reversing switch This product is equipped with a reversing pushbutton switch. The user can select either forward rotation (clockwise) or backward rotation (counterclockwise) by simply pressing the pushbutton. Refer to the Technical Data and Service Manual for the model indicated below. DH 24PC2 / No. E479, DH 24PC3 / No. E489, DH 30PC2 / No. E494 3-mode changing and variable lock mechanism for easy working-angle adjustment of chisels, etc. This product adopts Hitachi's unique mode selection mechanism: two standard modes of "Rotation + hammering" and "Rotation" and one additional mode of "Hammering." These modes enables not only light chiseling work using bull points but also heavy work using cold chisels and cutters such as groove digging and cornering work, thereby expanding the range of product use. The user can easily mount a bit in any of 12 angle positions by simply setting the change lever to the "neutral" position and turning the bit. Idle striking prevention mechanism with catch-ring method This product adopts a catch-ring type of idle hammering prevention mechanism. When the bit tool of the product is detached from an object under no load, air flows in and out through cylinder air holes to maintain uniform air pressure in the chamber. As a result, the hammering action stops. In this case, the projection at the tip of the striker fits into the O-ring (A) provided between damper holders (A) and (B) to prevent the air holes from being blocked by the recoiling striker. -2-

6 One-push type of bit mounting This product adopts a one-push quick bit mounting system without needing grip operation. First, fully insert the bit tool into the front cap hole until it stops, and then turn the bit tool while slightly pushing the bit tool. When the bit tool catches, push the bit tool there until it stops. Front cap Grip Tool Internal pressure adjustment mechanism An air passage is provided to connect inside the crankcase to the outside with a felt packing in the air passage. This passage only allows air (pressure) to pass and suppresses fluctuations in internal pressure. This stabilizes the hammering action and prevents idle striking and the leakage of grease. Felt packing Crank cover Air Air passage Felt packing (B) Rubber seal (Inside the crankcase) Easy-to-operate and double-molded switch handle and side handle The switch handle and side handle both feature a two-layer structure in which the plastic resin molded base is fully coated with a soft plastic resin. This gives the switch and side handles a soft feeling, and improves handle operability. -3-

7 1. Specifications Model Capacity mm SPECIFICATIONS DH 28PC Drill bit (Max. dia.): Concrete 28 (1-1/8 ) Steel 13 (1/2 ) Wood 32 (1-1/4 ) Core bit (Max. dia.): 80 (3-5/32 ) Power source - AC single phase 50 Hz or 60 Hz Voltage V Current A Power input W 720 Type of motor - AC single-phase commutator motor Enclosure - Materials : Nylon resin (Handle (A). (B), tail cover, crank cover) Polycarbonate resin (Housing) Aluminum alloy die casting (Crank case, cylinder case, gear cover) Colors : Green gray, green, black Type of switch - Variable trigger switch Types of handles - D-shaped handle and side handle Full load rotation rate min Full load impact rate min ,000 Weight Product* 3.5 (7.7) kg (lbs.) Packed 6.5 (14.3) Packaging - Plastic case Standard accessories - * Excluding the cord and side handle Plastic case Side handle Stopper

8 2. Optional Accessories (1) Drilling work for through-hole drilling (rotation + hammering) Drill bit (SDS plus shank) D L2 L1 D (mm) L1 (mm) L2 (mm) Code No. D (mm) L1 (mm) L2 (mm) Code No

9 (2) Drilling anchor holes (rotation + hammering) Drill bit (taper shank) + (a) Drill bit (taper shank) (b) Taper shank adapter (c) Cotter (SDS-plus shank) (a) Drill bit (Taper shank) (b) Taper shank adapter (c) Cotter Outer dia. (mm) Code No. Type Code No. Code No (7/16") 12.3 (1/2") 12.7 (1/2") 14.3 (9/16") 14.5 (9/16") 17.5 (11/16") Morse taper No (7/8") Morse taper No Part name Code No. A-taper B-taper A taper shank adapter (A-taper or B-taper) is provided as an optional accessory, but without the drill bit. (3) Anchor setting (hammering only) Anchor setting bar Anchor setting bar to permit anchor setting operation with the rotary hammer Anchor setting adapter (SDS-plus shank) Part name Overall length Code No. Part name Overall length Code No. W-1/4 Anchor setting adapter-a W-5/16 Anchor setting adapter-a W-3/8 Anchor setting adapter-a W-3/8 Anchor setting adapter-a W-1/4 Anchor setting adapter-b W-5/16 Anchor setting adapter-b W-3/8 Anchor setting adapter-b W-3/8 Anchor setting adapter-b Internal cone type External cone type Anchor setting bar for manual anchor setting + Anchor setting adapter Part name Code No. Part name Code No. W-1/4 Anchor setting adapter-a W-5/16 Anchor setting adapter-a W-3/8 Anchor setting adapter-a W-1/2 Anchor setting adapter-a W-5/8 Anchor setting adapter-a W-1/4 Anchor setting adapter-b W-5/16 Anchor setting adapter-b W-3/8 Anchor setting adapter-b W-1/2 Anchor setting adapter-b W-5/8 Anchor setting adapter-b Internal cone type External cone type -6-

10 (4) Large hole boring (rotation + hammering) Center pin, core bit, core bit shank and guide plate (a) Guide plate (b) Center pin (c) Core bit (d) Core bit shank (SDS-plus shank) (a) Guide plate Core bit (outer diameter ) (mm) Code No. Core bit (outer diameter ) (mm) Code No. 32 (1-1/4") (2") (1-3/8") (2-9/16") (1-1/2") (3-5/32") (1-3/4") (b) Center pin (Do not use bits with outer diameters of 25 mm (1") and 29 mm (1-1/8")) Part name Code No. Center pin (A) Core bit (outer diameter) 32, 35, 38 mm (1-1/4", 1-3/8", 1-1/2") Center pin (B) Core bit (outer diameter) 45, 50, 65, 80 mm (1-3/4", 2", 2-9/16", 3-5/32") (c) Core bit with guide plate (The guide plate is not supplied with 25 mm (1") and 29 mm (1-1/8") outer diameter core bits.) Outer diameter (mm) Code No. Outer diameter (mm) Code No. 25 (1") (1-3/4") (1-1/8") (2") (1-1/4") (2-9/16") (1-3/8") (3-5/32") (1-1/2") (d) Core bit shank (SDS-plus shank) Part name Overall length Code No. Core bit shank (A) Core bit (outer diameter) mm 105 mm (4-1/8") (1" --1-1/2") 300 mm (12") Core bit shank (B) Core bit (outer diameter) mm (1-3/4" /32") 300 mm (12") (5) Bolt placing operation with chemical anchor (rotation + hammering) + (Commercially available Chemical anchor adapter standard socket) (SDS-plus shank) Part name Code No mm (1/2") Chemical anchor adapter mm (3/4") Chemical anchor adapter

11 (6) Crushing operations (hammering only) Bull point (round type) Square bull point (SDS-plus shank) (SDS-plus shank) Code No Code No (7) Groove digging and edging (hammering only) Cold chisel Cutter (SDS-plus shank) (SDS-plus shank) Code No Code No (8) Grooving (hammering only) Grooving chisel (SDS-plus shank) Code No (9) Drilling holes and driving screws (rotation only) Drill chuck, chuck adapter (G), special screw and chuck wrench + + Special screw 13 mm (1/2") Drill chuck Chuck adapter (G) (13VLRB-D) (SDS-plus shank) Chuck wrench NOTE: When using the tool to loosen screws, open the three jaws of the drill chuck and securely fix the drill chuck to chuck adapter (G) with the special screw (a left-hand threaded M6 screw) for mounting the drill chuck onto chuck adapter (G). Part name Code No. Chuck adapter (G) for SDS-plus shank system mm (1/2") Drill chuck 13VLRB-D (with chuck wrench) Special screw (M6 left-hand threaded)

12 Cross-recessed head (Phillips) bit [Overall length: 70 mm] (For use with cross-recessed head (Phillips) screws) Slotted-head (minus) bit [Overall length: 50 mm] (For use with slotted-head (minus) screws) Stamped bit No. Tip thickness Bit No. Code No. Applicable screw dia. (mm) Bit tip thickness Code No. Applicable screw dia. (mm) No No (10) Driving screws (rotation only) Plus driver bit and chuck adapter (D) + Plus driver bit [overall length: 25 mm] (for cross-recessed head screws) Chuck adapter (D) (SDS-plus shank) Bit No. Screw size Code No. Part name Code No. No mm Z No mm Z Chuck adapter (D) for SDS-plus shank system (11) Grease for the hammer and hammer drill Containing 500 g (17.64 oz) Code No Containing 30 g (1.06 oz.) Code No g (2.50 oz.) Code No (12) Dust cup, Dust collector Dust cup Dust collector (B) ass y Code No Code No

13 COMPARISON WITH SIMILAR PRODUCTS 1. Comparison of Specifications (Superior specifications: ) Maker Model name HITACHI DH 28PC C B Capacity Drill bit dia. Concrete 28 (1-1/8 ) 28 (1-1/8 ) 28 (1-1/8 ) Steel mm 13 (1/2 ) 13 (1/2 ) 13 (1/2 ) Wood 32 (1-1/4 ) 32 (1-1/4 ) 32 (1-1/4 ) Core bit dia. mm 80 (3-5/32 ) 80 (3-5/32 ) 80 (3-5/32 ) Power input W Full-load rotation rate min ,100 (No-load) Full-load impact rate min , ,500 (No-load) 0-4,000 Impact energy J No-load noise level (measured) Full-load noise level (measured) Full-load vibration level (Tri-axial, measured) db(a) db(a) m/s Length 316 (12-7/16 ) 320 (12-5/8 ) 332 (13-1/16 ) Tool size Height mm 208 (8-3/16 ) 225 (8-55/64 ) 208 (8-3/16 ) Width 102 (4 ) 89 (3-1/2 ) 93 (3-21/32 ) Weight* kg (lbs.) 3.5 (7.7) 3.2 (7.0) 3.3 (7.3) Mode Mounting the drill bit - One push One push One push Reversing switch - Equipped Equipped None * Weight does not include the cord and side handle. -10-

14 2. Comparison of Drilling Speed Drilling speed varies considerably depending on the work conditions. Use the factory test results shown in the figure below for comparison purposes only. Comparison of drilling speed 700 Drilling Speed (mm/min) HITACHI DH28PC C B HITACHI DH30PC2 HITACHI DH25PB Drill Bit Dia. (mm) <Test conditions> Direction : Downward drilling Pushing force : 98 N (10 kgf) Test material : Concrete panel with compression strength of 2,352 N/cm 2 (240 kgf/cm 2 ) -11-

15 1. Safety instructions In the interest of promoting the safest and most efficient use of the Model DH 28PC Rotary Hammers by all of our customers, it is very important that when concluding a sale that the salesperson carefully ensure that the buyer seriously recognizes the importance of the Handling Instructions, and fully understands the precautions listed on the Caution Plate and Name Plate attached to each tool. A. Handling Instructions Although every effort is made in each step of design, manufacture, and inspection to provide protection against safety hazards, the dangers inherent in the use of any electric tool cannot be completely eliminated. Accordingly, the Handling Instructions list general precautions and suggestions on the use of electric power tools, and specific precautions and suggestions on the use of rotary hammers to enhance the safe, efficient use of the tool by customers. Salespersons must be thoroughly familiar with the Handling Instructions in order to offer appropriate guidance to the customer during sales promotion activities. B. Caution Plate The Model DH 28PC unit is provided with a Caution Plate (illustrated below) that lists basic safety precautions on use of the tool. Carefully ensure that the customer fully understands and follows these precautions before using the tool. [ For the USA and Canada ] PRECAUTIONS ON SALES PROMOTION [ For China ] [ For Mexico ] -12-

16 1. Grease replacement procedures REFERENCE MATERIALS The hammering section and gear change section use different types of grease. Grease need not be replenished unless the tool is disassembled for repair or grease is leaking due to a damaged seal. A special grease is used for the hammering section. After disassembling the hammering section (inside the cylinder case and crank case), carefully wipe old grease off the parts and fill the crank case (on the connecting rod side) with 25 g of grease and the crank case (on the cylinder side) with 5 g. Be careful not to overfill with an excessive amount of grease, which could cause hammering failure. The gear change section (inside the gear cover) uses Hitachi Motor Grease No. 29. The proper amount of grease is 15 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 trouble. Periodically change the grease in the slip clutch. Fully fill the slip clutch with Cosmos Molybdenum Grease No Structure of the Model DH 28PC Rotary Hammer Steel ball Cylinder Clutch Bevel gear Key rail Second gear Bevel pinion Armature Torque transmission The rotational force of the bevel gear is transmitted to the cylinder through the clutch and rotates the cylinder. The front side of the cylinder also serves as a drill bit holder. The drill bit inserted into the cylinder is coupled with two key rails and one steel ball to transmit the rotation. -13-

17 3. Three-Mode Changeover Mechanism The user can select "Rotation + Hammering," "Rotation only," or "Hammering" mode by operating the mode change lever of the product. Each of the three modes is explained below. Operate the change lever while pressing the pushbutton switch. Rotation and hammering Set the change lever to the "Rotation + hammering"( mark) position. The claw of the bevel gear engages with the claw of the clutch. Rotational force is transmitted to the cylinder coupled with the clutch and rotates the bit. At this time, cylinder air hole B is blocked by the slide sleeve. When the bit is pressed against an object, the striker blocks cylinder air hole A to form an air chamber between the piston and striker. Changes in air pressure inside the air chamber cause the striker to move. Hammering force is thus transmitted to the second hammer and then to the bit tool. Lock sleeve Bevel gear Slide sleeve Clutch Cylinder Striker Piston Air hole A Air hole B Change lever Hammering only Set the change lever to the "Hammering only" ( mark) position. The bevel gear disengages from the clutch to cut off the transmission of rotational force. The spline in the inner periphery of the lock sleeve engages with the spline on the end surface of the clutch. This locks both cylinder rotation and bit rotation at the same time. At this time, cylinder air hole B is blocked by the slide sleeve. When the bit is pressed against an object, the striker blocks cylinder air hole A to form an air chamber between the piston and striker. Changes in air pressure inside the air chamber cause the striker to move. Hammering force is thus transmitted to the second hammer and then to the bit tool. Lock sleeve Bevel gear Slide sleeve Cylinder Clutch Striker Air hole A Piston Air hole B Change lever -14-

18 Rotation only Set the change lever to the "Rotation only" ( mark) position. The claw of the bevel gear engages with the claw of the clutch. Rotational force is transmitted to the cylinder coupled with the clutch and rotates the bit. The slide sleeve moves to the front end side as the lock sleeve moves there. This keeps cylinder air hole B open. As a result, air pressure inside the air chamber remains the same and hammering force is not transmitted. Lock sleeve Slide sleeve Cylinder Bevel gear Clutch Striker Air hole A Piston Air hole B Change lever Neutral This product has a Neutral mode to be used to determine the working position of a bit tool such as a cold chisel. Set the change lever to the "Neutral" ( mark) position. The bevel gear disengages from the clutch and cuts off the transmission of rotational force. The lock sleeve also disengages from the clutch so that the cylinder can rotate freely. In this state, the user can turn a bit tool to the desired working position. Lock sleeve Slide sleeve Cylinder Bevel gear Clutch Striker Air hole A Piston Air hole B Change lever -15-

19 Refer to the Technical Data and Service Manual for the model indicated below. DH 24PC2 / No. E479, DH 24PC3 / No. E489, DH 30PC2 / No. E O-ring replacement 2. Striking operation 3. Mechanism to prevent idle hammering 4. Slip clutch mechanism 5. Sealing and dust-proof structure 6. Speed control 7. Handle and side handle 8. Caution when using Rotation only (No hammering) function 9. Drill bits 10. Tool retainer 11. Dust collector (B) -16-

20 REPAIR GUIDE Be sure to disconnect the power cord plug from the wall outlet before conducting repair. Otherwise, the motor may suddenly run, posing a very dangerous situation. 1. Precautions on Disassembly and Reassembly The [Bold] numbers in the descriptions below correspond to item numbers in the parts list and exploded view assembly diagram for the Model DH 28PC. 1. Disassembly of the tool retainer Disassembly Fully pull Grip [3] in the arrow direction and remove Front Cap [1]. Forcefully pull Front Cap [1] to remove it from Cylinder [21]. Then remove Stopper Ring [29] by using the stopper ring puller while pulling Grip [3]. You can then remove Grip [3], Ball Holder [4], Steel Ball D7.0 [20], Holder Plate [5], and Holder Spring [6] from Cylinder [21]. Grip [3] Steel Ball D7.0 [20] Ball Holder [4] Holder Spring [6] Front Cap [1] Cylinder [21] Stopper Ring [29] Holder Plate [5] 2. Disassembly of the hammering mechanism (a) Cylinder Case and Cylinder First, remove Seal Lock Hex. Socket Hd. Bolt M4 x 12 [57] from Change Lever [58], and then demount Change Lever [58] and Lever Holder [59]. Remove Hex. Socket Hd. Bolt (W/Flange) M4 x 10 [43], Hex. Socket Hd. Bolt (W/Flange) M5 x 16 [98], Tapping Screw (W/Flange) D5 X 20 (Black) [78], and Tapping Screw (W/Flange) D4 X 25 (Black) [44]. Remove Handle (A). (B) Set [40] from Crank Case [104] and Housing Ass'y [74]. Then remove Tapping Screw (W/Flange) D4 X 16 (Black) [82]. Remove Tail Cover [81] from Housing Ass'y [74]. Remove Hex. Socket Hd. Bolt (W/Flange) M5 x 16 [98] from Crank Cover [99], and then demount Crank Cover [99] and Rubber Seal [102] from Crank Case [104]. Remove Retaining Ring For D35 Hole [60] by using stopper ring puller and demount Lever Shaft [61]. -17-

21 Remove Seal Lock Hex. Socket Hd. Bolt M6 x 20 [7] from Cylinder Case [8] and then separate Cylinder Case [8], Cylinder [21], and other assembly parts from Crank Case [104]. Demount Clutch [33] and Clutch Spring [32] from the assembly parts. Cylinder Case [8] Clutch [33] Cylinder [21] Clutch Spring [32] Push out Cylinder [21] from the front end. You can then separate the assembly parts (Cylinder [21], Second Hammer [23], Striker [30], Slide Sleeve [19], Lock Sleeve [17], Lock Spring [16], Ball Bearing 6905DDUCMNS7S [14], etc.) from Cylinder Case [8]. Second Hammer [23] Lock Spring [16] Slide Sleeve [19] Cylinder [21] Felt Packing (A) [13] Lock Sleeve [17] Ball Bearing 6905DDUCMNS7S [14] Striker [30] -18-

22 Remove Felt Packing (A) [13] from the assembly parts and insert the tip of the bearing puller s hook into the space between Ball Bearing 6905DDUCMNS7S [14] and Washer (A) [70]. In this state, stand Cylinder [21] upright, then use a hand press to push the end face of Cylinder [21] and then demount Ball Bearing 6905DDUCMNS7S [14]. You can then separate Washer (A) [70], Lock Spring [16], Lock Sleeve [17], Washer (B) [67], and Slide Sleeve [19]. Cylinder [21] and other parts may pop up under spring pressure when you demount Ball Bearing 6905DDUCMNS7S [14]. Therefore, be very careful. Hand press Cylinder [21] Ball Bearing 6905DDUCMNS7S [14] Hook of bearing puller Washer (A) [70] Lock Spring [16] Lock Sleeve [17] Washer (B) [67] Slide Sleeve [19] -19-

23 (b) Components in the Cylinder Remove Striker [30] from inside of separated Cylinder [21]. Then insert a punch (or thin but rigid material) into the inspection hole of Cylinder [21], hammer Stopper Ring [29] to move it from the groove in Cylinder [21] in the arrow direction. Use a spring hook (J201, No ) to pull out Stopper Ring [29] from the groove in the arrow direction. You can then remove Damper Holder (B) [28], Damper Holder (A) [26], O- Ring (A) [27], Damper (B) [25], Damper Washer [24], and Second Hammer [23] from Cylinder [21]. Punch etc. Second Hammer [23] Damper Washer [24] Spring hook Cylinder [21] Damper (B) [25] Stopper Ring [29] Damper Holder (A) [26] Damper Holder (B) [28] O-Ring (A) [27] (c) Piston Piston [36] remains in Crank Case [104]. Turn Crank Shaft [106], move Piston [36] toward the lower dead end, then remove Connecting Rod [37] from Crank Shaft [106] and remove the piston assembly. Crank Case [104] Crank Shaft [106] Piston [36] Connecting Rod [37] Crank Case [104] Crank Shaft [106] Connecting Rod [37] -20-

24 (d) First Gear and Crank Shaft Remove Seal Lock Hex. Socket Hd. Bolt M5 x 40 [103] from Crank Case [104], and then separate Crank Case [104] from Gear Cover [97]. Place Crank Case [104] on an adequate tool rest with its Connecting Rod [37] side facing downward, then use an adequate steel rod and a hand press to push the end of Crank Shaft [106]. Crank Shaft [106], First Gear [111], and Ball Bearing 608VVC2PS2L [96] then come off. Hand press Suitable steel bar Ball Bearing 608VVC2PS2L [96] First Gear [111] Crank Shaft [106] Crank Case [104] Work bench -21-

25 Reassembly Perform reassembly by reversing the order of the disassembly procedure. However, special attention should be given to the following items. 1. Reassembly of the hammering mechanism (a) First Gear and Crank Shaft Press-fit Oil Seal (B) [84] into Crank Case [104], mount O-Ring (S-32) [109], fit Ball Bearing 6002DDCMPS2L [108], and mount Retaining Ring for D32 Hole [110] by using the stopper ring puller. Use the hand press to press-fit Crank Shaft [106] into Ball Bearing 6002DDCMPS2L [108]. Then fit Feather Key 3 x 3 x 8 [107] into the groove of Crank Shaft [106], support the flat face of Crank Shaft [106] on an adequate steel rod, and then use an adequate tool to press-fit First Gear [111]. Confirm that Feather Key 3 x 3 x 8 [107] is firmly seated in the key groove of First Gear [111] before press-fitting. Be sure to support the flat surface of Crank Shaft [106] with the steel rod since the abutting surface has steps. Crank Case [104] Hand press Suitable steel bar Crank Shaft [106] Oil Seal (B) [84] O-Ring (S-32) [109] Ball Bearing 6002DDCMPS2L [108] Retaining Ring for D32 Hole [110] First Gear [111] Feather Key 3 x 3 x 8 [107] Suitable tool (b) Piston Remount O-Ring (I.D 19.2) [31] on Piston [36], apply a small amount of power tool grease No.29 to Piston Pin [35], and then insert Piston Pin [35] into Piston [36] and Connecting Rod [37]. Then move Crank Shaft [106] toward the lower dead end, insert the piston assembly from the cylinder case side of Crank Case [104], and mount it on Crank Shaft [106]. Crank Case [104] Piston [36] Connecting Rod [37] Crank Shaft [106] Crank Case [104] Crank Shaft [106] O-ring [62] Piston Pin [35] Connecting Rod [37] -22-

26 (C) Components in the Cylinder Mount O-Ring (C) [22] on Second Hammer [23], bundle Second Hammer [23], Damper Washer [24], Damper (B) [25], Damper Holder (A) [26], O-Ring (A) [27], and Damper Holder (B) [28] as one unit, and then insert the unit into Cylinder [21] that is laid flat. Then push it further until it stops. Reassemble Damper Washer [24] with the round inner diameter surface aligned with the round surface of Second Hammer [23]. Do not reverse the assembling direction of Damper (B) [25]. Insert Stopper Ring [29] into Cylinder [21] and use an adequate pipe to push it into the cylinder groove. Confirm that Stopper Ring [29] is firmly seated in the groove by looking through the two inspection holes on Cylinder [21]. Then insert Striker [30] with O- Ring [62] into Cylinder [21]. Cylinder [21] Second Hammer [23] O-Ring (C) [22] Damper Holder (A) [26] O-Ring (A) [27] Damper Washer [24] Damper (B) [25] Damper Holder (B) [28] Cylinder [21] Hole (2 pcs.) Groove Stopper Ring [29] Pipe (d) Cylinder, Cylinder Case and Crank Case Fit Slide Sleeve [19], Washer (B) [18], Lock Sleeve [17], Lock Spring [16], and Washer (A) [15] to the periphery of Cylinder [21]. Fit these parts to Cylinder [21] so that Ball Bearing 6905DDUCMNS7S [14] does not come off, and then fully press-fit Ball Bearing 6905DDUCMNS7S [14] to Cylinder [21] until it stops. If Ball Bearing 6905DDUCMNS7S [14] is not firmly fitted to Cylinder [21], Ball Bearing 6905DDUCMNS7S [14] may pop up under the spring pressure of Lock Spring [16]. Therefore, be sure to firmly push Ball Bearing 6905DDUCMNS7S [14]. Then fit Felt Packing (A) [13] to the periphery of Cylinder [21]. Reassemble Oil Seal [10], Damper (A) [11], Damper Washer (B) [12], O-Ring (1AS-50) [9] in Cylinder Case [8], and then insert the cylinder assembly into Cylinder Case [8]. In this case, align the depressed portion in the inner periphery of Cylinder Case [8] with the projected portion in the periphery of Lock Sleeve [17] when inserting the cylinder assembly. Reassemble Clutch Spring [32], Clutch [33], and Bevel Gear [34] from the rear end of Cylinder [21], and then couple Cylinder Case [8] with Crank Case [104]. Align the projected portion in the inner periphery of Clutch [33] with the groove in the periphery of Cylinder [21] during assembly. For easy coupling of Cylinder Case [8] with Crank Case [104], rotate Crank Shaft [106] to move Piston [36] toward the upper dead end, and then insert Piston [36] into Cylinder [21] in this state. -23-

27 Oil Seal [10] Damper Washer (B) [12] Damper (A) [11] O-Ring (1AS-50) [9] Cylinder [21] Felt Packing (A) [13] Clutch [33] Cylinder Case [8] Clutch Spring [32] Bevel Gear [34] Crank Case [104] Piston [36] Connecting Rod [37] Crank Shaft [106] (e) Change Lever Fit O-Ring [62] to Crank Case [104] and insert Lever Shaft [61] as shown in the figure. Use the stopper ring puller to remount Retaining Ring for D35 Hole [60], then rotate Lever Shaft [61] by 90 degrees as shown in the figure ("Rotation + hammering" position). Use Change Lever [58] for easy rotation of Lever Shaft [61]. Reassemble Lever Holder [59] and then insert Change Lever [58] along with Lever Spring [64], Pushing Button [65], and Pin D2 x 10 [63] at the "Rotation + hammering" position. Press Pushing Button [65] of Change Lever [58] and confirm that Pin D2 x 10 [63] of Change Lever [58] is firmly seated in the groove of Lever Holder [59]. Then tighten Seal Lock Hex. Socket Hd. Bolt M4 x 12 [57]. Crank Case [104] Lever Shaft [61] -24- Retaining Ring for D35 Hole [60]

28 (f) Fan Guide Assemble Fan Guide [69] into Housing Ass'y [74] with the projected portion of Fan Guide [69] aligned with the depressed portion of Housing Ass'y [74]. Concave portion Housing Ass y [74] Fan Guide [69] Convex portion (g) Crank Cover Firmly reassemble Rubber Seal [102] in Crank Case [104] in the direction shown below. Reassemble Crank Cover [99] along with Felt Packing [101] and Felt Packing (B) [100] inside Crank Case [104]. Tighten Hex. Socket Hd. Bolt (W/Flange) M5 x 16 [98]. Crank Case [104] Crank Cover [99] Felt Packing (B) [100] Hole Hole Rubber Seal [102] Felt Packing [101] Crank Cover [99] Rubber Seal [102] Crank Case [104] -25-

29 (h) Oil Seal and O-Ring Carefully handle all oil rings and seals (Cylinder Case [8] Oil Seal [10], O-Ring (1AS-50) [9], Oil Seal (B) [84] and O-Ring (S-32) [109] of Crank Case [104], Second Hammer [23] O-Ring (C) [22], O-Rings (I.D 19.2) [31] of Piston [36] and Striker [30], O-Ring (A) [27], lever shaft O-Ring [62], Rubber Seal [102])) so as not to damage any of these parts. 2. Application of lubricant Filling Hitachi Motor Grease No. 29 Apply 15 g of grease to Crank Case [104] and Gear Cover [97] for lubricating the gears. Application of Hitachi Motor Grease No. 29 Apply grease to Armature [68] pinion, Steel Ball D7.0 [20], and O-Ring [62]. Filling special grease (for the hammer and hammer drill) Apply 25 g of grease to the Connecting Rod [37] side of Crank Case [104], and 5 g of grease to the Cylinder [21] side. Application of special grease (for the hammer and hammer drill) Apply special grease to the inner diameter lip portions of Oil Seal (B) [84] and Oil Seal [10], the inner diameter portion of Connecting Rod [37], the outer diameter portions of Piston [36], O-Ring [62], Damper (A) [11], O-Ring (C) [22], Damper (B) [25], O-Ring (A) [27], O-Ring [62], the outer diameter portion of Lock Sleeve [17], the slide portions of Second Hammer [23] and Striker [30], the inner diameter portions of Slide Sleeve [19] and Clutch [33], and both the inner and outer diameter portions of Bevel Gear [34]. 3. Tightening torque Apply screw locking agent TB1401 to all hex. socket head bolts M4, M5 and M6. NOTE: Be sure to apply screw locking agent (Three Bond TB1401) to the threads during reassembly. Otherwise, any bolts becoming loose due to vibration may damage the tool body. M6 Seal Lock Hex. Socket Hd. Bolt M6 x 20 [7] (For mounting the cylinder case) N m ( kgf cm) 0 0 M5 Seal Lock Hex. Socket Hd. Bolt M5 x 40 [103] (For mounting the crank case) N m (80 kgf cm) 0 0 Hex. Socket Hd. Bolt (W/Flange) M5 x 16 [98] (For mounting the crank cover) N m (80 0 kgf cm) Hex. Socket Hd. Bolt (W/Flange) M5 x 16 [98] (For mounting the handle) ± 0.49 N m (40 ± 5 kgf cm) M4 Hex. Socket Hd. Bolt (W/Flange) M4 x 10 [43] (For mounting the handle) ± 0.49 N m (20 ± 5 kgf cm) Seal Lock Hex. Socket Hd. Bolt M4 x 12 [57] (For mounting the change lever) ± 0.49 N m (15 ± 5 kgf cm) Hex. Hd. Tapping Screw D5 x 40 [72] ± 0.49 N m (30 ± 5 kgf cm) Tapping Screw (W/Flange) D5 x 20 [78] ± 0.49 N m (30 ± 5 kgf cm) Tapping Screw (W/Flange) D4 [44] [47] [82] ± 0.49 N m (20 ± 5 kgf cm) -26-

30 4. Internal wiring (1) Wiring diagram for products without a noise suppressor Black or Brown Stator Gray White Lead wire (Brown) Cord Armature White or Blue Red Stator Black Lead wire (Blue) Speed control switch Reversing switch (2) Wiring diagram for products with a noise suppressor Black or Brown Stator Gray White Lead wire (Brown) Cord Armature Noise suppressor White or Blue Red Stator Black Lead wire (Blue) Speed control switch Reversing switch 5. Wiring around switches (1) Wiring of the reversing switch Insert Internal Wire (Blue) [45] to terminal (1) marked on the reversing switch and Internal Wire (Brown) [46] to terminal (2) as shown in the figure. Insert the lead wire (White) from Stator [73] to terminal (3) and the lead wire (Black) from Stator [73] to terminal (4). Gently pull on each inserted lead wire to confirm that the wires do not come out. For wire disconnection, insert the tip of a small slotted screwdriver or needle into the hole on the side of each terminal, and then pull out the wire. Internal Wire (Blue) [45] Stator [73] : Black Stator [73] : White Internal Wire (Brown) [46] -27-

31 (2) Wiring of the speed control switch Insert a Black or Brown cord to terminal (1 ) marked on the variable trigger switch and a White or Blue cord to terminal (2 ) as shown in the figure, then tighten their screws (with tightening torque of 0.6 ±0.2 N m (6 ±2 kgf cm). Insert the lead wire (Gray) from Stator [73] to terminal (M1), the other lead wire (Red) from Stator [73] to terminal (M2), and the lead wires from Noise Suppressor [51] to the terminals (C1 and C2). Gently pull on each inserted cord or lead wire to confirm that it does not come out. For wire disconnection, insert the tip of a small slotted screwdriver or needle into a hole on the side of each terminal, and then pull out the wire. Stator [73]: Red Cord [55] : Black or Brown M2 Stator [73]: Gray M1 C1 1 2 C2 Cord [55] : White or Blue Noise Suppressor [51] 6. Insulation tests Upon completing completion of disassembly and repair, measure the insulation resistance and conduct a dielectric strength test as follows: Insulation resistance: 7 M or more using a DC 500 V megohm tester Dielectric strength : AC 4,000 VAC for one minute, with no abnormalities to 240 V (and 110 V for UK products) : AC 2,500 VAC for one minute, with no abnormalities to 120 V (except UK products) 7. No-load current value After no-load operation for 30 minutes, the no-load current values should be as follows: Voltage (V) Current (A) max

32 STANDARD REPAIR TIME (UNIT) SCHEDULES MODEL Fixed Variable min. Work Flow DH 28PC Housing Ass y Stator Tail Cover Crank Cover Rubber Seal Handle (A). (B) Set Switch Cord Cord Armor D8.8 Gear Cover Armature Ass y Ball Bearing 6001DDCMPS2L Ball Bearing 608VVC2PS2L General Assembly Front Cap Grip Ball Holder Holder Plate Holder Spring Cylinder Case Oil Seal Damper (A) Ball Bearing 6905DDUCMNS7S Crank Shaft Oil Seal (B) Ball Bearing 6002DDCMPS2L O-ring (S-32) First Gear Ball Bearing 608VVC2PS2L Piston Connecting Rod Bevel Gear Crank Case O-ring Lever Shaft Lever Holder Change Lever Lever Spring Pushing Button Slide Sleeve Washer (A) Washer (B) Lock Spring Lock Sleeve Clutch Clutch Spring Slip Clutch Ass y Bevel Pinion Oil Seal (B) Collar Sleeve Ball Bearing 6001DDCMPS2L Second Gear Ball Bearing 608VVC2PS2L Striker O-ring (I.D 19.2) x 2 Second Hammer Damper Washer Damper (B) Damper Holder (A) Damper Holder (B) Cylinder -29-

33 Model DH 28PC ROTARY HAMMER LIST NO. F408 (E1) Rev.1 22% TU01659 DH28PC

34 PARTS DH 28PC ITEM NO. CODE NO. DESCRIPTION NO. USED REMARKS FRONT CAP STOPPER RING GRIP BALL HOLDER HOLDER PLATE HOLDER SPRING SEAL LOCK HEX. SOCKET HD. BOLT M6 X CYLINDER CASE O-RING (1AS-50) OIL SEAL DAMPER (A) DAMPER WASHER (B) FELT PACKING (A) DD BALL BEARING 6905DDUCMNS7S WASHER (A) LOCK SPRING LOCK SLEEVE WASHER (B) SLIDE SLEEVE STEEL BALL D7.0 (10 PCS.) CYLINDER O-RING (C) SECOND HAMMER DAMPER WASHER DAMPER (B) DAMPER HOLDER (A) O-RING (A) DAMPER HOLDER (B) STOPPER RING STRIKER O-RING (I.D 19.2) CLUTCH SPRING CLUTCH BEVEL GEAR PISTON PIN PISTON CONNECTING ROD 1 38 NAME PLATE HITACHI PLATE HANDLE (A). (B) SET 1 * SWITCH 1 * SWITCH (1P PILLAR TYPE) 1 FOR USA, CAN PUSHING BUTTON HEX. SOCKET HD. BOLT (W/FLANGE) M4 X TAPPING SCREW (W/FLANGE) D4 X 25 (BLACK) 3 * INTERNAL WIRE 18AWG X 300L (BLUE) 1 * INTERNAL WIRE 16AWG X 300L (BLUE) 1 FOR USA, CAN, GBR (110V) * INTERNAL WIRE 18AWG X 300L (BROWN) 1 * INTERNAL WIRE 16AWG X 300L (BROWN) 1 FOR USA, CAN, GBR (110V) TAPPING SCREW (W/FLANGE) D4 X *ALTERNATIVE PARTS 9-09

35 PARTS DH 28PC ITEM NO. CODE NO. DESCRIPTION NO. USED REMARKS CORD CLIP CORD ARMOR D8.8 1 * SUPPORT (B) 1 FOR EUROPE * NOISE SUPPRESSOR 1 FOR EUROPE VINYL TUBE 1 * INTERNAL WIRE 1 FOR EUROPE * CONNECTOR (10 PCS.) 1 FOR EUROPE * Z CORD 1 (CORD ARMOR D8.8) * Z CORD 1 (CORD ARMOR D8.8) FOR GBR (110V) * Z CORD 1 (CORD ARMOR D8.8) FOR GBR (230V) * Z CORD 1 (CORD ARMOR D8.8) FOR USA, CAN * Z CORD 1 (CORD ARMOR D8.8) FOR KUW, SIN * Z CORD 1 (CORD ARMOR D8.8) FOR CHN * Z CORD 1 (CORD ARMOR D8.8) FOR IND LEVER LABEL SEAL LOCK HEX. SOCKET HD. BOLT M4 X CHANGE LEVER LEVER HOLDER RETAINING RING FOR D35 HOLE (10 PCS.) LEVER SHAFT O-RING PIN D2 X LEVER SPRING PUSHING BUTTON DD BALL BEARING 6001DDCMPS2L WASHER (B) 1 * C ARMATURE 110V-115V 1 * U ARMATURE ASS'Y 120V 1 INCLUD. 66, 67, 70, 71 * E ARMATURE 220V-230V 1 * F ARMATURE 240V FAN GUIDE WASHER (A) VVM BALL BEARING 608VVC2PS2L HEX. HD. TAPPING SCREW D5 X 40 2 * C STATOR 110V-115V 1 * G STATOR 120V 1 * E STATOR 220V-230V 1 * H STATOR 220V-230V 1 FOR SIN * J STATOR 240V HOUSING ASS'Y 1 INCLUD. 77, BRUSH CAP CARBON BRUSH (1 PAIR) BRUSH HOLDER TAPPING SCREW (W/FLANGE) D5 X 20 (BLACK) HEX. SOCKET SET SCREW M5 X BEARING BUSHING (B) TAIL COVER TAPPING SCREW (W/FLANGE) D4 X 16 (BLACK) BEVEL PINION OIL SEAL (B) *ALTERNATIVE PARTS - 3 -

36 PARTS ITEM NO. CODE NO. DESCRIPTION NO. USED REMARKS COLLAR SLEEVE DD BALL BEARING 6001DDCMPS2L RETAINING RING FOR D12 SHAFT (10 PCS.) WASHER SECOND GEAR STEEL BALL D3.97 (10 PCS.) CLUTCH PLATE SPRING PLATE BELLEVILLE SPRING BUSHING VVM BALL BEARING 608VVC2PS2L GEAR COVER HEX. SOCKET HD. BOLT (W/FLANGE) M5 X CRANK COVER FELT PACKING (B) FELT PACKING RUBBER SEAL SEAL LOCK HEX. SOCKET HD. BOLT M5 X CRANK CASE SEAL PACKING CRANK SHAFT FEATHER KEY 3 X 3 X DD BALL BEARING 6002DDCMPS2L O-RING (S-32) RETAINING RING FOR D32 HOLE FIRST GEAR SLIP CLUTCH ASS'Y 1 INCLUD. 83, 85, DH 28PC *ALTERNATIVE PARTS

37 STANDARD ACCESSORIES ITEM NO. CODE NO. DESCRIPTION NO. USED REMARKS CASE STOPPER ROD SIDE HANDLE ASS'Y 1 INCLUD SIDE HANDLE WING BOLT M6 X MOUNT NUT M6 (10 PCS.) BAND BOLT HOLDER BOLT M8 X 45 1 DH 28PC *ALTERNATIVE PARTS

38 OPTIONAL ACCESSORIES DH 28PC ITEM NO. CODE NO. DESCRIPTION NO. USED REMARKS BULL POINT (SDS+) 250MM (ROUND SHANK TYPE) CHEMICAL ANCHOR ADAPTER (SDS+) 12.7MM X 90L CHEMICAL ANCHOR ADAPTER (SDS+) 19.0MM X 100L CHUCK HANDLE ANCHOR SETTING ADAPTER A (SDS+) W1/4 X 260L CHUCK WRENCH 10G ANCHOR SETTING ADAPTER A (SDS+) W5/16 X 260L ANCHOR SETTING ADAPTER A (SDS+) W3/8 X 160L ANCHOR SETTING ADAPTER A (SDS+) W3/8 X 260L ANCHOR SETTING ADAPTER B (SDS+) W1/4 X 260L ANCHOR SETTING ADAPTER B(SDS+) W5/16 X 260L ANCHOR SETTING ADAPTER B (SDS+) W3/8 X 160L ANCHOR SETTING ADAPTER B (SDS+) W3/8 X 260L TAPER SHANK ADAPTER (SDS PLUS) NO TAPER SHANK ADAPTER (SDS PLUS) NO A-TAPER SHANK ADAPTER (SDS PLUS) B-TAPER SHANK ADAPTER (SDS PLUS) SPECIAL SCREW M6 X CORE BIT SHANK (SDS PLUS) 45-90MM 300L CORE BIT SHANK (SDS PLUS) 25-38MM 105L CORE BIT SHANK (SDS PLUS) 25-38MM 300L CHUCK ADAPTER (D) (SDS PLUS) DRILL CHUCK AND ADAPTER SET 1 INCLUD. 624, CHUCK ADAPTER (G) (SDS PLUS) DRILL CHUCK 13VLRB-D 1 INCLUD FLAT HD. SCREW (A) (LEFT HAND) M6 X DRILL CHUCK 13VLD-D GREASE FOR HAMMER. HAMMER DRILL (500G) GREASE (A) FOR HAMMER. HAMMER DRILL (30G) GREASE FOR HAMMER. HAMMER DRILL (70G) Z + DRIVER BIT (A) NO.2 25L Z + DRIVER BIT (A) NO.3 25L COTTER CENTER PIN (A) 109L FOR CORE BIT D CENTER PIN (B) 104L FOR CORE BIT D ADAPTER (A) FOR HAMMER DRILL CORE BIT (A) 25MM CORE BIT (A) 29MM CORE BIT (A) 32MM 1 INCLUD GUIDE PLATE (FOR CORE BIT 32MM) CORE BIT (A) 35MM 1 INCLUD GUIDE PLATE (FOR CORE BIT 35MM) CORE BIT (A) 38MM 1 INCLUD GUIDE PLATE (FOR CORE BIT 38MM) CORE BIT (B) 45MM 1 INCLUD GUIDE PLATE (FOR CORE BIT 45MM) CORE BIT (B) 50MM 1 INCLUD GUIDE PLATE (FOR CORE BIT 50MM) CORE BIT (B) 65MM 1 INCLUD GUIDE PLATE (FOR CORE BIT 65MM) *ALTERNATIVE PARTS 9-09

39 OPTIONAL ACCESSORIES DH 28PC ITEM NO. CODE NO. DESCRIPTION NO. USED REMARKS CORE BIT (B) 80MM 1 INCLUD GUIDE PLATE (FOR CORE BIT 80MM) ANCHOR SETTING ADAPTER A W1/4" (MANUAL) ANCHOR SETTING ADAPTER A W5/16" (MANUAL) ANCHOR SETTING ADAPTER A W3/8" (MANUAL) ANCHOR SETTING ADAPTER A W1/2" (MANUAL) ANCHOR SETTING ADAPTER A W5/8" (MANUAL) ANCHOR SETTING ADAPTER B W1/4" (MANUAL) ANCHOR SETTING ADAPTER B W5/16" (MANUAL) ANCHOR SETTING ADAPTER B W3/8" (MANUAL) ANCHOR SETTING ADAPTER B W1/2" (MANUAL) ANCHOR SETTING ADAPTER B W5/8" (MANUAL) TAPER SHANK DRILL BIT D11 X TAPER SHANK DRILL BIT D12.3 X TAPER SHANK DRILL BIT D12.7 X TAPER SHANK DRILL BIT D14.3 X TAPER SHANK DRILL BIT D14.5 X TAPER SHANK DRILL BIT D17.5 X TAPER SHANK DRILL BIT D21.5 X SYRINGE (BLOW-OUT BULB TYPE) DRILL BIT (SDS PLUS) D4.0 X DRILL BIT (SDS PLUS) D5.0 X DRILL BIT (SDS PLUS) D5.0 X DRILL BIT (SDS PLUS) D5.5 X DRILL BIT (SDS PLUS) D6.5 X DRILL BIT (SDS PLUS) D7.0 X DRILL BIT (SDS PLUS) D8.0 X DRILL BIT (SDS PLUS) D8.5 X DRILL BIT (SDS PLUS) D9.0 X DRILL BIT (SDS PLUS) D12.0 X DRILL BIT (SDS PLUS) D12.0 X DRILL BIT (SDS PLUS) D12.7 X DRILL BIT (SDS PLUS) D14.0 X DRILL BIT (SDS PLUS) D15.0 X DRILL BIT (SDS PLUS) D16.0 X DRILL BIT (SDS PLUS) D16.0 X DRILL BIT (SDS PLUS) D17.0 X DRILL BIT (SDS PLUS) D19.0 X DRILL BIT (SDS PLUS) D20.0 X DRILL BIT (SDS PLUS) D22.0 X DRILL BIT (SDS PLUS) D25.0 X DUST CUP SYRINGE (BELLOWS TYPE) DUST COLLECTOR (B) ASS'Y 1 INCLUD. 695, DUST COLLECTOR ASS'Y 1 INCLUD DUST COVER SEAL COVER RETAINING RING FOR D30 SHAFT WASHER STEEL BALL D6.35 (10 PCS.) *ALTERNATIVE PARTS - 7 -

40 OPTIONAL ACCESSORIES ITEM NO. CODE NO. DESCRIPTION NO. USED REMARKS OUTER RACE SOCKET SOCKET ADAPTER (B) 1 DH 28PC *ALTERNATIVE PARTS Printed in Japan 9-09 (090907N)