Hitachi C 7UR, C 7BUR Service Manual

CONFIDENTIAL

Dec. 2017

PRODUCT NAME

Hitachi 184 mm (7-1/4”) Circular Saw

Models C 7UR, C 7BUR *For the USA and Canada only

Hitachi 185 mm (7-1/4”) Circular Saw

Model C 7UR *Except for the USA and Canada

CONTENTS

REPAIR GUIDE ---------------------------------------------------------------------------------------------------------------- 1

1. Precautions on disassembly and reassembly ----------------------------------------------------------- 1

• Disassembly ------------------------------------------------------------------------------------------------------ 1

• Reassembly ------------------------------------------------------------------------------------------------------ 6

• Lubrication points and type of lubricant -------------------------------------------------------------------- 8

• Screw tightening torque --------------------------------------------------------------------------------------- 8

• Checking after reassembly ------------------------------------------------------------------------------------- 9

• Wiring diagram ---------------------------------------------------------------------------------------------------10

STANDARD REPAIR TIME (UNIT) SCHEDULES -------------------------------------------------------------------12

Page

C

C 7UR

Overseas Sales Division

REPAIR GUIDE

CAUTION: During disassembly and reassembly, and at all other times as well, always exercise

sufficient care in handling to ensure that there is no deviation in the bottom surface

flatness of the base or in its perpendicularity relative to the saw blade.

1. Precautions on disassembly and reassembly

[Bold] numbers in the description below correspond to the item numbers in the parts list and exploded

assembly diagram for the Model C 7UR, and {Bold} numbers correspond to those for the Model C 7BUR.

CAUTION: Prior to disassembly of the circular saw, remove the TCT Saw Blade [12]{12} to protect

the saw blade teeth and yourself.

1. Removal of the TCT saw blade

(1) Gently turn the Hex. Socket Hd. Bolt M8 x 15.5 [14]{14} using the accompanying Hex. Bar Wrench 6

mm [503]{502} to lock the Spindle and Gear Set [1]{1} while pushing the Lock Lever [23]{23}.

(2) After locking the Spindle and Gear Set [1]{1}, turn the Hex. Bar Wrench 6 mm [503]{502}

counterclockwise to loosen and remove the Hex. Socket Hd. Bolt M8 x 15.5 [14]{14} and

[13]{13}. Draw the Lever [16] and insert the Lower Guard [8]{8} into the Gear Cover [26]{26} and then

remove the TCT Saw Blade [12]{12}.

NOTE: Be careful not to cut your fingers by the saw blade teeth.

• Removal of the TCT saw blade

[23]{23}

1

(3) Remove Washer (A) [11]{11} from the Spindle and Gear Set [1]{1}. If the Base Plate [65]{62} interferes

with removing Washer (A) [11]{11}, loosen the Lever [66]{63} and adjust to shallower cutting depth.

Loosen

2

Push in

Disassembly

3

[503]{502}

4

[14]{14}

[13]{13}

[12]{12}

[16]{16}

Washer (B)

5

6

Draw

• Removal of washer (A)

[26]{26}

[11]{11}

[12]{12}

[14]{14}

[13]{13}

Loosen

Tighten

[65]{62}

[66]{63}

-1-

}

}

2. Removal of the lower guard

(1) Remove the two Seal Lock Flat Hd. Screws M4 x 10 [10]{10}, then remove the Bearing Cover [9]{9}.

(2) Remove the hook of the Return Spring [7]{7} from the Gear Cover [26]{26} and the Lower Guard [8]{8},

then remove the Lower Guard [8]{8}, Liner [5]{5} and Washer [6]{6}.

• Removal of the lower guard

[26]{26}

[6]{6}

[5]{5}

[7]{7}

[8]{8}

[9]{9}

[10]{10}

3. Removal of the lever

(1) Loosen the Lever [66]{63} and remove the Retaining Ring (E-type) [58]{55}.

(2) Remove the Lever [66]{63}, Lock Nut [59]{56}, Bolt Washer M8 [60]{57}, and Bolt (Square) M8

[29]{29}.

• Removal of Lever

[66]{63

[59]{56

[58]{55}

[29]{29}

[60]{57}

-2-

(

)

4. Removal of the bearing holder and spindle and gear set

(1) After removing the Lower Guard [8]{8} as described above, loosen the two Seal Lock Flat Hd. Screws

M5 x 14 [3]{3}.

(2) Remove the Bearing Holder [2]{2} together with the Spindle and Gear Set [1]{1} from the Gear Cover

[26]{26}.

• Removal of the bearing holder and spindle and gear set

[26]{26}

[3]{3}

[1]{1}

[2]{2}

5. Separation of the spindle and gear set from the bearing holder

(1) Support the Bearing Holder [2]{2} with an appropriate tubular jig.

(2) Push down on the end of the spindle to separate the Spindle and Gear Set [1]{1} from the Bearing

Holder [2]{2}.

• Separation of the spindle and gear set from the bearing holder

Push

Jig

60 mm

2-23/64"

50 mm

(1-31/32")

[1]{1}

[2]{2}

-3-

6. Disassembly of the motor unit

(1) Remove the Brush Caps [45]{42} and take out the Carbon Brushes [44]{41}.

(2) Loosen the Machine Screws M5 x 50 [39]{36} and separate the Housing Ass'y [42]{39} from the Gear

Cover [26]{26}. If the Armature [22]{22} is remained in the Housing Ass'y [42]{39}, gently tap the

Housing Ass'y [42]{39} on the edge of the surface where the Gear Cover [26]{26} is mounted with a

wooden or plastic hammer and remove the Armature [22]{22}.

NOTE: Do not hit the fan of the Armature [22]{22}.

• Disassembly of the motor unit

[26]{26}

[34]{32}

[32]{30}

[23]{23}

[53]{56}

[22]{22}

[18]{18}

[17]{17}

[33]{31}

Fan

[45]{42}

[44]{41}

-4-

7. Removal of the base ass’y

Extract the Roll Pin D6 x 40 [74]{71} and remove the Base Ass’y [77]{74} from the Housing Ass’y [42]{39}.

• Removal of the base ass'y

[74]{71}

[42]{39}

[77]{74}

8. Disassembly of handle (A).(B) set

(1) Loosen and remove the six Tapping Screws D4 x 20 [38]{35}.

(2) Remove handle (B).

(3) Remove the Switch [48]{45}, Cord [55]{52}, etc. from handle (A).

• Disassembly of handle (A).(B) set

[38]{35}

[47]{44}

[48]{45}

[51]{46}

[56]{53}

{48}

[53]{50}

[52]{49}

[55]{52}

[54]{51}

[38]{35}

[46]{43}

-5-