Hitachi CM 7MR, CM 7MC, CM 7MRU Technical Data And Service Manual
• Cutting slits in concrete, cement, bricks or tiles. Slits can then be chipped with a separate tool to form grooves
for laying plumbing piping or trunking cable.
[ NEW FEATURES ]
Sturdy and highly-attractive aluminum die-cast
dust cover.
Largest cutting width in the class.
* In addition to the features above, the Models CM
7MR, CM 7MRU and CM 7MC have features (selling
points) common to base Models G 23SR, G 23SRU
and G 23SC3, respectively.
The Models CM 7MR, CM 7MRU and CM 7MC are new wall chasers developed based on disc grinder
Models G 23SR, G 23SRU and G 23SC3, respectively, and have main bodies common to those base models.
Consequently, these new wall chasers also have main features common to the base models. Moreover, the
Models CM 7MR, CM 7MRU and CM 7MC are each equipped with a dust collection cover (for the diamond
wheels).
PRODUCT NAME
Hitachi Wall Chaser
Models 180 mm (7”) CM 7MR
CM 7MRU
CM 7MC
MARKETING OBJECTIVE
APPLICATIONS
SELLING POINTS
International Sales Division
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR
IMPROVEMENT.
LIST Nos.
CM 7MR : E721
CM 7MRU : E722
CM 7MC : E723
Jun. 2009
C
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:
Competitors
Symbols Utilized
Company Name Model Name
B BOSCH GNF65A
CONTENTS
Page
SELLING POINT DESCRIPTIONS ----------------------------------------------------------------------------------------- 1
SPECIFICATIONS --------------------------------------------------------------------------------------------------------------2
1. Specifications
--------------------------------------------------------------------------------------------------------------------------------- 2
COMPARISON WITH SIMILAR PRODUCT------------------------------------------------------------------------------ 3
1. Comparison of Specifications
------------------------------------------------------------------------------------------------------- 3
PRECAUTIONS ON SALES PROMOTION ------------------------------------------------------------------------------ 4
1. Safety Instructions
------------------------------------------------------------------------------------------------------------------------ 4
REPAIR GUIDE------------------------------------------------------------------------------------------------------------------ 5
1. Precautions on Disassembly and Reassembly ----------------------------------------------------------- 5
STANDARD REPAIR TIME (UNIT) SCHEDULES---------------------------------------------------------------------- 7
Assembly Diagrams for CM 7MR
Assembly Diagrams for CM 7MRU
Assembly Diagrams for CM 7MC
-1-
㩷㩷㩷㩷㩷
In addition to the following features, the Models CM 7MR, CM 7MRU and CM 7MC have features (selling
points) common to base Models G 23SR, G 23SRU and G 23SC3, respectively. Refer to the TECHNICAL
DATA AND SERVICE MANUAL of each base model for details of the selling points.
Sturdy and highly-attractive aluminum die-cast dust cover
The dust cover is made of aluminum die-casting. It is
both sturdy and highly attractive. (B's dust cover is made
of steel sheet (2.0-mm thick).)
Largest cutting width in the class
The maximum cutting width is 5 mm larger than that
of B. This is the largest cutting width for this class of
wall chaser.
Maker
HITACHI
Model
CM 7MR,
CM 7MRU,
CM 7MC
B
Max cutting
width (W)
45 mm
(1-49/64”)
40 mm
(1-37/64”)
SELLING POINT DESCRIPTIONS
㩷㩷㩷㩷㩷
W
Diamond wheel
Dust collection cover
-2-
1. Specifications
Model
CM 7MR CM 7MRU CM 7MU
Base Model
G 23SR G 23MRU G 23MC
Max. cutting depth
35 mm (1-3/8”)
Max. cutting width
45 mm (1-49/64”)
External
dia.
180 mm (7”)
Thickness
1.5 to 2.0 mm (1/16” to 5/64”) (Thickness of installation part)
Diamond
wheel
size
Internal dia.
22.2 mm (7/8”)
Power source
AC single phase 50 or 60 Hz
Voltage and power
input
No-load speed
6,600/min.
Type of motor
AC single phase commutator motor
Enclosure
Housing (black) (CM 7MC: green)
Handle, tail cover (green) (CM 7MC: black)
Gear cover, packing gland ---------------------------- Aluminum alloy die-casting
Type of switch
Trigger switch
Net
*
7.9 kg (17.4lbs.) 8.8 kg (19.5 lbs.)
Weight
Gross
10.0 kg (22.1 lbs.) 10.9 kg (24.1 lbs.)
Type of packing
Carton box
Standard accessories
Side handle -----------------1
Wrench -----------------------1
Optional accessories
Diamond wheel (For concrete and masonry work)
·
Segment type (Code No. 305459, 307009)
·
Wave-shape type (Code No. 305460)
*
: Net weight excludes the cord and diamond wheel.
SPECIFICATIONS
Voltage
(V)
Current
(A)
Power
input
(W)
110 19.0 2,000
230 9.2 2,000
Voltage
(V)
Current
(A)
Power
input
(W)
230 9.2 2,000
Voltage
(V)
Current
(A)
Power
input
(W)
110 20.9 2,300
230 10.5 2,300
---- Polyamide resin with glass fiber
-3-
1. Comparison of Specifications
(Superior specifications:
)
Maker HITACHI
Model name CM 7MR CM 7MRU CM 7MU
B
Cutter dia. 180 mm (7”) 230 mm (9”)
Power input 2,000 W 2,300 W 2,400 W
No-load rotation speed 6,600/min. 5,000/min.
No-load peripheral speed 62 m/s (203 ft/s) 60 m/s (196 ft/s)
No-load sound pressure level 94 dB (A) 97 dB(A)
Max. cutting depth 35 mm (1-3/8”) 65 mm (2-9/16”)
Max. cutting width
45 mm (1-49/64”)
40 mm (1-37/64”)
Width of base (Roller)
110 mm
(4-21/64”)
140 mm
(5-33/64”)
Overall length
571 mm
(22-31/64”)
580 mm
(22-53/64”)
600 mm
(23-5/8”)
Weight 7.9 kg (17.4 lbs.) 8.8 kg (19.5 lbs.) 8.4 kg (18.5 lbs.)
*: Weight excludes the cord and diamond wheel.
COMPARISON WITH SIMILAR PRODUCT
-4-
1. Safety Instructions
In the interest of promoting the safest and most efficient use of the Models CM 7MR, CM 7MRU and
CM 7MC Wall Chasers by all of our customers, it is very important 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 Nameplate.
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 using any electric power 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 the Wall Chasers in order to
enhance the safe and efficient use of the tools by the customer.
Salespersons must be thoroughly familiar with the contents of the Handling Instructions in order to offer
appropriate guidance to customers during sales promotion activities.
B. Caution on name plate
Each tool is provided with a namplate that shows the following basic safety precautions on using the tool.
C. Precautions on usage
Never press the pushing button while the diamond wheel is rotating.
Note that pressing the pushing button during diamond wheel rotation will immediately stop the spindle.
In such case, there is a danger that the M14 bolt for diamond wheel fixation may become loose, resulting in
the diamond wheel unexpectedly flying off and possibly causing serious injury.
PRECAUTIONS ON SALES PROMOTION
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