Hitachi DH 28PC Technical Data And Service Manual
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Hitachi DH 28PC Technical Data And Service Manual

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PRODUCT NAME
Hitachi Rotary Hammer
DH 28PC
Model
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 dust-
collection 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.
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 catch-
ring 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.
LIST No. F408
Dec. 2009
Sales Division
D

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  • Page 1 LIST No. F408 Dec. 2009 PRODUCT NAME Hitachi Rotary Hammer DH 28PC Model 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.
  • 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

    1. Comparison of Specifications ----------------------------------------------------------------------------------------------------- 2. Comparison of Drilling Speed ---------------------------------------------------------------------------------------------------- PRECAUTIONS ON SALES PROMOTION ----------------------------------------------------------------------------12 1. Safety Instructions ---------------------------------------------------------------------------------------------12 REFERENCE MATERIALS-------------------------------------------------------------------------------------------------13 REPAIR GUIDE----------------------------------------------------------------------------------------------------------------17 1. Precautions on Disassembly and Reassembly ---------------------------------------------------------17 STANDARD REPAIR TIME (UNIT) SCHEDULES--------------------------------------------------------------------29 Assembly Diagram for DH 28PC...

  • Page 4: Selling Points

    HITACHI Model DH 28PC 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...
  • Page 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 25.2 DH 28PC 18.2...
  • Page 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.

  • Page 7: Specifications

    SPECIFICATIONS 1. Specifications Model DH 28PC Drill bit (Max. dia.): Concrete 28 (1-1/8”) Steel 13 (1/2”) Capacity Wood 32 (1-1/4”) Core bit (Max. dia.): 80 (3 -5/32”) Power source AC single phase 50 Hz or 60 Hz Voltage Current Power input...

  • Page 8: Optional Accessories

    2. Optional Accessories (1) Drilling work for through-hole drilling (rotation + hammering) Drill bit (SDS plus shank) D (mm) L1 (mm) L2 (mm) Code No. D (mm) L1 (mm) L2 (mm) Code No. 303571 12.5 303592 303572 12.5 303607 303573 12.7 303593 303574...
  • Page 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.
  • Page 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.
  • Page 11 (6) Crushing operations (hammering only) Bull point (round type) Square bull point (SDS-plus shank) (SDS-plus shank) Code No. 303046 Code No. 316656 (7) Groove digging and edging (hammering only) Cold chisel Cutter (SDS-plus shank) (SDS-plus shank) Code No. 316657 Code No. 316658 (8) Grooving (hammering only) Grooving chisel (SDS-plus shank)
  • Page 12 • Cross-recessed head (Phillips) bit • Slotted-head (minus) bit [Overall length: 70 mm] [Overall length: 50 mm] (For use with cross-recessed head (Phillips) screws) (For use with slotted-head (minus) screws) Tip thickness Stamped bit No. Bit No. Code No. Applicable screw dia. (mm) Bit tip thickness Code No.

  • Page 13: Comparison With Similar Products

    COMPARISON WITH SIMILAR PRODUCTS 1. Comparison of Specifications (Superior specifications: Maker HITACHI Model name DH 28PC Concrete 28 (1-1/8”) 28 (1-1/8”) 28 (1-1/8”) Steel 13 (1/2”) 13 (1/2”) 13 (1/2”) Drill bit dia. Capacity Wood 32 (1-1/4”) 32 (1-1/4”) 32 (1-1/4”) Core bit dia.

  • Page 14: Comparison Of Drilling Speed

    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 HITACHI DH28PC HITACHI DH30PC2 HITACHI DH25PB Drill Bit Dia. (mm) <Test conditions>...

  • Page 15: Precautions On Sales Promotion

    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.

  • Page 16: Reference Materials

    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.
  • Page 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. •...
  • Page 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.
  • Page 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. E494 1. O-ring replacement 2. Striking operation 3. Mechanism to prevent idle hammering 4.

  • Page 20: Repair Guide

    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. Disassembly 1. Disassembly of the tool retainer Fully pull Grip [3] in the arrow direction and remove Front Cap [1].
  • Page 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]...
  • Page 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].
  • Page 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.
  • Page 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].
  • Page 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.
  • Page 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].
  • Page 27 Damper Washer (B) [12] Oil Seal [10] O-Ring (1AS-50) [9] Damper (A) [11] Cylinder [21] Clutch [33] Felt Packing (A) [13] Clutch Spring [32] Bevel Gear [34] Cylinder Case [8] Crank Case [104] Connecting Rod [37] Piston [36] Crank Shaft [106] (e) Change Lever Fit O-Ring [62] to Crank Case [104] and insert Lever Shaft [61] as shown in the figure.
  • Page 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]. Housing Ass’y [74] Concave portion Fan Guide [69] Convex portion (g) Crank Cover Firmly reassemble Rubber Seal [102] in Crank Case [104] in the direction shown below.

  • Page 29: Tightening Torque

    • 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].

  • Page 30: Internal Wiring

    4. Internal wiring (1) Wiring diagram for products without a noise suppressor Stator Gray White Lead wire (Brown) Black or Brown Armature Cord White or Blue Black Lead wire (Blue) Stator Reversing switch Speed control switch (2) Wiring diagram for products with a noise suppressor Stator Gray Black or Brown...

  • Page 31: Insulation Tests

    (2) Wiring of the speed control switch Cord [55] : Cord [55] : Insert a Black or Brown cord to terminal (1 ) Black or Brown White or Blue 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).

  • Page 32: Standard Repair Time (Unit) Schedules

    STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL 60 min. Fixed Work Flow DH 28PC Housing Ass’y Stator Handle (A). (B) Gear Cover Switch Cord Tail Cover Cord Armor D8.8 Armature Ass’y Ball Bearing 6001DDCMPS2L Ball Bearing 608VVC2PS2L Crank Cover Rubber Seal...
  • Page 33 LIST NO. F408 ROTARY HAMMER 2009 9 7 Model DH 28PC (E1) DH28PC TU01659 Rev.1...
  • Page 34 PARTS DH 28PC ITEM CODE NO. DESCRIPTION REMARKS USED 306-345 FRONT CAP 306-340 STOPPER RING 324-527 GRIP 330-192 BALL HOLDER 324-526 HOLDER PLATE 330-191 HOLDER SPRING 992-803 SEAL LOCK HEX. SOCKET HD. BOLT M6 X 20 330-174 CYLINDER CASE 990-067...
  • Page 35 PARTS DH 28PC ITEM CODE NO. DESCRIPTION REMARKS USED 960-266 CORD CLIP 953-327 CORD ARMOR D8.8 317-492 SUPPORT (B) FOR EUROPE 325-566 NOISE SUPPRESSOR FOR EUROPE 321-322 VINYL TUBE 981-500 INTERNAL WIRE FOR EUROPE 959-140 CONNECTOR 50091 (10 PCS.) FOR EUROPE 500-390Z CORD (CORD ARMOR D8.8)
  • Page 36 PARTS DH 28PC ITEM CODE NO. DESCRIPTION REMARKS USED 330-197 COLLAR 330-194 SLEEVE 600-1DD BALL BEARING 6001DDCMPS2L 939-542 RETAINING RING FOR D12 SHAFT (10 PCS.) 992-503 WASHER 330-198 SECOND GEAR 959-155 STEEL BALL D3.97 (10 PCS.) 992-916 CLUTCH PLATE 992-926...

  • Page 37: Standard Accessories

    STANDARD ACCESSORIES DH 28PC ITEM CODE NO. DESCRIPTION REMARKS USED 330-220 CASE 982-671 STOPPER ROD 330-208 SIDE HANDLE ASS'Y INCLUD. 504-510 330-209 SIDE HANDLE 307-947 WING BOLT M6 X 12 330-210 MOUNT 949-556 NUT M6 (10 PCS.) 330-212 BAND 330-211...
  • Page 38 OPTIONAL ACCESSORIES DH 28PC ITEM CODE NO. DESCRIPTION REMARKS USED 303-046 BULL POINT (SDS+) 250MM (ROUND SHANK TYPE) 303-044 CHEMICAL ANCHOR ADAPTER (SDS+) 12.7MM X 90L 303-045 CHEMICAL ANCHOR ADAPTER (SDS+) 19.0MM X 100L 303-334 CHUCK HANDLE 302-976 ANCHOR SETTING ADAPTER A (SDS+) W1/4 X 260L...
  • Page 39 OPTIONAL ACCESSORIES DH 28PC ITEM CODE NO. DESCRIPTION REMARKS USED 982-680 CORE BIT (B) 80MM INCLUD. 652 982-692 GUIDE PLATE (FOR CORE BIT 80MM) 971-794 ANCHOR SETTING ADAPTER A W1/4" (MANUAL) 971-795 ANCHOR SETTING ADAPTER A W5/16" (MANUAL) 971-796 ANCHOR SETTING ADAPTER A W3/8" (MANUAL) 971-797 ANCHOR SETTING ADAPTER A W1/2"...
  • Page 40 OPTIONAL ACCESSORIES DH 28PC ITEM CODE NO. DESCRIPTION REMARKS USED 986-805 OUTER RACE 986-806 SOCKET 306-910 SOCKET ADAPTER (B) - 8 - Printed in Japan 9 - 09 *ALTERNATIVE PARTS (090907N)

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