Page 1
MODELS C 12LDH C 12FDH Hitachi Power Tools COMPOUND MITER SAW TECHNICAL DATA C 12LDH SERVICE MANUAL C 12FDH LIST Nos. C 12LDH: E943 Oct. 2005 C 12FDH: E944 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: Competitor Symbol Utilized Company Name Model Name BOSCH 4212L DW716 DEWALT DELTA...
8-3. How to Use the Vise Assembly .......................14 8-4. Confirmation for Use of Sub Fence ....................15 8-5. Cutting Operation ..........................17 8-6. Digital Display Panel (For Model C 12LDH) ...................22 9. ADJUSTMENT OF COMPONENTS ....................23 9-1. Bevel Angle Fine Adjustment ......................23 10.
Page 4
11-8. Product Precision ........................... 41 11-9. Adjustment of Laser Marker Accuracy ................... 42 11-10. Tightening Torque ......................... 45 12. REPAIR GUIDE ..........................46 13. STANDARD REPAIR TIME (UNIT) SCHEDULES ............... 51 Assembly Diagram for C 12LDH Assembly Diagram for C 12FDH...
Following the 12" compound miter saw Model C 12LCH equipped with the laser marker, we introduce the new two 12" compound miter saws Models C 12LDH and C 12FDH. The Model C 12LDH is equipped with the class-first digital display panel that indicates miter/bevel angles. In addition, the Models C 12LDH and C 12FDH can perform bevel cutting at 45˚...
4-1. Selling Point Descriptions (1) Digital display panel that indicates miter/bevel angles (Model C 12LDH) Use the digital display panel when cutting a workpiece at an optional angle. The class-first digital display panel indicates a Laser line miter/bevel cutting angle with a numeric value. There is no reading error caused by visual check between the indicator and the scale.
Page 7
(4) Bevel angle fine adjustment The Models C 12LDH and C 12FDH are easily and finely adjustable to an optional bevel angle. Pulling the plate allows the bevel angle to be adjusted by about 48˚ to the left or about 48˚ to the right with one-touch simple operation.
Saw blade outer diameter 305 mm (12") external dia. Digital display Precision 0.5˚ (It is not the actual precision when cutting a wood workpiece.) (For Models C 12LDH) < 1 mW (CLASS II ) Maximum output Laser marker Wave length...
6. COMPARISONS WITH SIMILAR PRODUCTS Maker/Model HITACHI C 12LDH/C 12FDH Item 74 mm x 201 mm 63.5 mm x 235 mm 63.5 mm x 200 mm 70 mm x 203 mm (2-29/32" x 7-29/32") (2-1/2" x 9-1/4") (2-1/2" x 7-7/8") (2-3/4"...
7. PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Models C 12LDH and C 12FDH Compound Miter Saws by all of our customers, it is very important that at the time of sale the salesperson carefully ensures...
Page 12
(4) Caution label (A) (at the front of the hinge) and caution label (C) (at the front of the base) Do not stare into laser beam. If your eye is exposed directly to the laser beam, it can be hurt. Caution label (A) and caution label (C) are adhered to each machine to comply with the standards for the safe use of laser equipment.
Administration (FDA). Standards, regulations and guidelines of the other countries are under investigation. 7-4. Laser Marker The Models C 12LDH and C 12FDH are equipped with the laser marker that complies with the U. S. A. standard, FDA Complies with 21 CFR, Food and Drugs, Part 1040 "Performance Standard for Light-emitting Products", Class II.
(The working environment where the illuminance is 200 luxes or less is dark and difficult to operate the Models C 12LDH and C 12FDH.) The laser line is invisible under direct sunlight of fine weather. Prepare a shaded area or relocate to a shaded area to operate the Models C 12LDH and C 12FDH . --- 10 ---...
(Model C 12LDH 8-1. Position Adjustment of Laser Line only) The Models C 12LDH and C 12 FDH are equipped with the laser Laser marker switch (Models marker for easy alignment with the ink line on the workpiece. C 12LDH and...
Page 16
The laser marker will not light up if the digital display switch is turned off. (Only Model C 12LDH) Instruct the above precautions on the laser marker to the customers.
8-2. Before Cutting (1) Oblique angle Before the power tool is shipped from the factory, it is adjusted for 0˚, right angle, left 45˚ bevel cutting angle and right 45˚ bevel cutting angle with 8 mm bolt (A), 8 mm bolt (B) and 8 mm bolt (C). When changing the adjustment, change the height of 8 mm bolt (A), 8 mm bolt (B) or 8 mm bolt (C) by turning them.
(4) Stopper for precision cutting (Stopper and holder are optional accessory) The stopper facilitates continuous precision cutting in lengths of 11" to 17-3/4" (280 mm to 450 mm). To install the stopper, attach it to the holder with the 6 mm wing bolt as shown in Fig. 17. Stopper (optional accessory) Workpiece...
8-4. Confirmation for Use of Sub Fence (1) Confirmation for use of sub fence (A) WARNING: In the case of right bevel cutting, turn sub fence (A) clockwise. Unless it is turned clockwise, the main body or saw blade may contact sub fence (A), resulting in an injury. Left bevel angle cutting This power tool is equipped with sub fence (A).
Page 20
Sub fence (C) In the case of left bevel angle cutting, remove sub fence (C) by sliding to the side and removing from the top as shown in Fence (B) Fig. 21. Loosen knob (B) then remove sub fence (C) (Fig. 22). WARNING: To attach sub fence (C), insert then securely tighten knob (B).
(4) Press cutting The Models C 12LDH and C 12FDH can be used for press cutting of workpieces up to 70 mm x 203 mm (2-3/4" x 8") in a single operation by simply pushing the saw blade section (head) downward.
Page 22
(7) Compound (miter + bevel) cutting Compound cutting can be accomplished by combining the miter cutting and bevel cutting operations described in paragraphs (5) and (6) above. (For details, please refer to the Instruction Manual.) When the saw blade section (head) is inclined 45˚ to the right and left, the table can be turned up to 45˚ to the right and left. (8) Crown molding cutting This machine can cut two types of crown molding workpieces by combining the miter and bevel cutting operations (for USA).
Page 23
(1) Setting to cut crown molding at positions in Fig. 25 (See Fig. 26; tilt the head to the left.): Turn the turn table to the right and set the miter angle as follows: For 45˚ type crown moldings: 35.3˚ ( mark) For 38˚...
Page 24
(3) Setting to cut crown moldings at positions in Fig. 25 (See Fig. 30; tilt the head to the right.): Turn the turn table to the right and set the miter angle as follows: For 45˚ type crown moldings: 35.3˚ ( mark) For 38˚...
Page 25
Cutting method of crown molding without tilting the saw blade (1) Crown molding stoppers (L) and (R) (optional accessories) allow easier cuts of crown molding without tilting the saw blade. Install them to both sides of the base as shown in Figs. 34-a and 34-b. After inserting, tighten the 6 mm knob bolts to secure the crown molding guides.
The laser marker will not light up if the digital display switch is turned off (only the Model C 12LDH). Do not use the main unit near equipment that generates electrical noise such as generators.
9. ADJUSTMENT OF COMPONENTS 9-1. Bevel Angle Fine Adjustment Hinge Right bevel angle Knob (A) Handle Left bevel angle Knob (A) Clamp lever Pull 8 mm bolt (C) Clamp lever Bevel plate (Stopper for right 45˚ bevel angle) 8 mm bolt (B) (Stopper for left 45˚...
10. PACKING (1) Preparation before packing (i) Remove the dust bag from the main body. (ii) Turn the turn table 48˚ clockwise and remove the side handle. Secure the turn table with the attached hex. socket head bolt M10. (2) Mounting packing (C) (i) Place packing (C) under the gear case and lower the head section.
[Bold] numbers in the descriptions below correspond to the item numbers in the pars list and exploded assembly diagram of the Model C 12LDH. For the Model C 12FDH, refer to the parts list separately. Be sure to first disconnect the power plug when performing disassembly or replacement of the saw blade.
Page 30
Fig. 42 1. Remove the two Machine Screws (W/Washers) M4 x 10 (Black) [71] to remove two Indicators (B) [70]. Remove the two Machine Screws (W/Washers) M5 x 16 [50] to remove the Dust Guide Ass'y [49]. 2. Remove the Machine Screw (W/Washers) M4 x 16 [63] to remove the Scale Plate Ass'y [60]. 3.
Page 31
7. Remove the Retaining Ring for D12 Shaft [34], Hex. Socket Hd. Bolt M5 x 16 [73] and Spring Washer M5 [74]. Then the Hinge Plate [75] can be removed. 8. Remove the four Machine Screws M4 x 10 [37] to remove the Hinge Cover [38]. Remove the Machine Screw (W/Washers) M4 x 12 (Black) [17] and the Nylon Clip [18].
Page 32
B. Armature ass'y Belt, pinion ass'y and spindle ass'y Tools required: • Phillips screwdriver • Plastic hammer Fig. 43 1. Remove the three Machine Screws (W/Washers) M5 x 16 [202] to remove the Pulley Cover [286]. 2. Pull the Belt (200H10) 16 x 508 [273] outward and turn it to remove from Pulley (A) [270] and the Pinion Ass'y [274].
Page 33
C. Armature ass'y Switch, switching power supply, stator ass'y, armature ass'y and pulley (A) Tools required: • Phillips screwdriver • Flat-blade screwdriver • Hex. bar wrench 4 mm • Nipper • Plastic hammer • Box wrench 13 mm Fig. 44 1.
Page 34
7. Removal of the Switch (3P Faston Type) [226] and the Switching Power Supply [220] (a) After the above steps from 1 to 5, remove the two Machine Screws (W/Washers) M5 x 16 [202] and Hex. Socket Hd. Bolts M5 x 70 [205] to remove the left side of the Handle Ass'y [203]. (b) Remove the three Tapping Screws (W/Flange) D4 x 20 (Black) [221] and remove the upper part of Switch Handle (A).(B) Set [222].
Page 35
D. Safety cover and link Safety cover and link Tools required: • Phillips screwdriver • Box wrench 17 mm (standard accessory) Fig. 45 1. Remove the two Machine Screws M5 x 10 [262]. Then the Spindle Cover [264] and the Bolt Washer M5 [263] can be removed.
Page 36
E. Laser module (A) and spring Laser module (A) and spring Tools required: • Phillips screwdriver • Hex. bar wrench 5 mm • Hex. bar wrench 3 mm • Hex. bar wrench 2.5 mm • Plastic hammer • Hammer • Long-nose pliers Fig.
Page 37
(f) Remove the two Hex. Socket Hd. Bolts M6 x 20 [44] to remove the Laser Holder Ass'y [83]. (g) Remove the Split Pin D2 x 12 [3] with long-nose pliers. Loosen the Special Bolt M5 [8] and lightly tap the Roll Pin D3 x 14 [5] with a hammer to remove it.
Page 38
G. Digital display (Models C 12LDH) Tool required: • Phillips screwdriver Fig. 48 1. Remove the two Machine Screws (W/Washers) M5 x 16 [103] securing Table Insert (A) [101] and remove Table Insert (A). 2. Remove the Machine Screw (W/Washers) M4 x 16 [109] to remove Cord Cover (A) [110].
(4) When replacing the Return Spring [298], apply 2 grams of Hitachi Motor Grease to the inner circumference of the new Return Spring [298] prior to reassembly. (5) When replacing Liner (B) [65], apply 5 grams of Hitachi Motor Grease to the sliding surface of the Turn Table Ass'y [108] prior to reassembly.
WARNING: Be sure to turn off Switch (A) [216] at the front of the handle ass'y and unplug the power cord plug from the receptacle before replacing Laser Module (A) [14] and the Switching Power Supply [220]. Do not stare into beam while the laser marker is lighting. Wiring diagram (C 12LDH) Fig. 49 --- 36 ---...
Page 41
Wiring diagram (C 12LDH) Cord [201] Wind tetron tape 1.5 or 2 turns. Switch (A) [216] Connector Switch (B) [217] 50092 [214] Connector 50092 [214] Connect the connectors of Switch (B) [217] and Cord (B) [218]. Cord (B) [218] Switching Power Supply [220] Fig.
Base Ass'y [167], tighten the Nylon Nut M8 [104] so that the Turn Table Ass'y [108] turns smoothly without excessive play or vibration. During reassembly, liberally apply grease (Hitachi Motor Grease) at the point marked "A" in Fig. 56. Base Ass'y [167] Shaft (B) [168] Fig.
11-7. Lubrication Advise the customer to lubricate the machine as indicated below at least once a month. Also, prior to applying lubrication, any sawdust, dirt or other foreign matter should be thoroughly wiped away with a soft cloth. (1) Swiveling section of the Gear Case [246] and the Hinge Ass'y [43] Coat the swiveling and sliding portion of the Gear Case [246] and the Hinge Ass'y [43] with machine oil.
11-9. Adjustment of Laser Marker Accuracy (1) Construction of laser marker and functions of each component Laser Holder (A) [2]: The squareness between the laser line and the base surface can be adjusted by turning the minus Hex. Socket Set Screw M5 x 6 [7]: groove at the rear.
Page 47
(2) Adjustment of squareness with the fence surface [246] The laser line inclines to the left by turning the Hex. Socket Set Screw M5 x 6 [7] clockwise and inclines to the right by turning counterclockwise. The squareness of the laser line with the fence surface can be adjusted in this manner.
Page 48
(4) Adjustment of the laser marker Adjust the laser marker according to the following steps from Adjust the product accuracy first because the accuracy of the laser marker is adjusted aligning the cut surface of the workpiece. First, hold a workpiece of 38 mm in height and 89 mm in width with the vise and perform right-angle cutting.
12. REPAIR GUIDE Unit: mm Factory Inspection, repair or Item Phenomenon Cause standard adjustment • Adjust squareness with the a Inaccurate 0.2/100 Inaccurate cutting Nylock Hex. Socket Hd. Bolt squareness between (Dummy disc) Inaccurate • • • M8 x 20 [69]. the turn table and the (Fig.
Page 51
• Replace the saw blade. is applied due to dull saw blade. d Incorrect saw blade is ----- • Use a suitable Hitachi-supplied used. saw blade. • If the saw blade has a large number of teeth, the cutting resistance will be increased.
Page 52
[217] for conductivity. • Replace Switch (B) (1P Type) [217]. c Switch (A) failure ------ • Check Switch (A) (1P Type) (Only Model C 12LDH) [216] for conductivity. • Replace Switch (A) (1P Type) [216]. d Switching power ------ • Check the Switching Power...
Page 53
Improper wiring ------ • Check the wiring. Digital display does not indicate anything. (Model C 12LDH) b Monitor failure ------ • Replace the Monitor Ass'y [118]. c Monitor ass'y failure ------ • Check the Monitor Ass'y [118] for conductivity.
Page 54
Digital display does not a Same as item 10- a • Same as item 10- a to d . indicate properly. to d . (Model C 12LDH) b Encoder failure • Replace the Encoder [127]. (Miter angle) • Replace the Encoder [33].
13. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 70 min. MODEL Fixed Work Flow C 12LDH C 12FDH General Assembly Switching Housing Ass'y Cord Cover (B) Handle Ass'y Power Supply Stator Ass'y Pulley Cover Switch (A) Housing Cover [C 12LDH] Switch (B)
Page 56
Hitachi Power Tools LIST NO. E943 ELECTRIC TOOL PARTS LIST COMPOUND MITER SAW 2005 • • Model C 12LDH (E1)