Hitachi Koki RB24E (SV) User manual

RB24E (SV)
Blower
RB24E (SV)
Handling Instructions
Read the manual carefully before operating this machine.

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- 1 -
Meanings of symbols
NOTE! Some units do not carry them.
symbols
WARNING
The engine exhaust from this product contains chemicals known to the State of
California to cause cancer, birth defects and other reproductive harm.
Read, understand and follow all warnings and instructions in this manual and on the
unit.
It is important that you read, fully understand and observe the following safety
precautions and warnings. Careless or improper use of the unit may cause serious or
fatal injury.
Always wear eye, head and ear protectors when using this unit.
Explains choke position. Upper sign indicates choke closed and the lower fully open.
WARNING DANGER
Keep hands off from rotating fan. For vacuum, vacuum pipe and bag must be in
place. For blower, dust cover must be securely installed.
WARNING DANGER
Hot surfaces ; The mufer or catalytic mufer and surrounding cover may become
extremely hot. Always keep clear of exhaust and mufer area, otherwise serious
personal injury may occur.
Index
What is what? ................................................................
Warnings and safety instructions ..................................
Specications ................................................................
Assembly procedures ....................................................
Operating procedures ...................................................
Maintenance ..................................................................
Parts breakdown ...........................................................
2
3
4
5
5
6
7
Keep all children, bystanders and helpers 50 ft (15 m) away from the unit. If anyone
approaches you, stop the engine immediately.

- 2 -
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1435
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What is what?
Since this manual covers several models, there may be some
difference between pictures and your unit. Use the instructions
that apply to your unit.
1. Fuel cap
2. Throttle trigger
3. Starter handle
4. Fuel tank
5. Carburetor
6. Air cleaner
7. Handle
8. Suspension eyelet
9. Ignition switch
10. Straight pipe
11. Fan-headed pipe
12. Dust cover
13. Spark plug
14. Choke knob
15. Priming bulb
16. Cruise lever
17. Knob bolt
18. Vacuum pipe
19. Bent pipe
20. Dust bag
21. Combi box spanner
22. Handling instructions

- 3 -
Warnings and safety instructions
Pay special attention to statements preceded by the following words:
WARNING
Indicates a strong possibility of severe personal injury or loss
of life, if instructions are not followed.
CAUTION
Indicates a possibility of personal injury or equipment damage, if
instructions are not followed.
NOTE
Helpful information for correct function and use.
Operator safety
• IMPORTANT: A dust lter mask should be worn during operation.
• Always wear a safety face shield or goggles.
• Always wear heavy, long pants, boots and gloves. Do not wear
loose clothing, jewelry, short pants, sandals or go barefoot.
Secure hair so it is above shoulder length.
• Do not operate this tool when you are tired, ill or under the
inuence of alcohol, drugs or medication.
• Never let a child or inexperienced person operate the machine.
• Wear hearing protection. Pay attention to your surroundings.
Be aware of any bystanders who may be signaling a problem.
Remove safety equipment immediately upon shutting off engine.
• Wear head protection.
• Never start or run the engine inside a closed room or building.
Breathing exhaust fumes can kill.
• Keep handles free of oil and fuel.
• Keep hands away from moving part or heated area.
•
Do not grab or hold the unit by the blow pipe and the vacuum pipe.
• When the unit is turned off make sure the engine has stopped
before the unit is set down.
• When operation is prolonged, take a break from time to time
so that you may avoid possible Hand-Arm Vibration Syndrome
which is caused by vibration.
• Never start or run the engine inside a closed room or building
and/or near inammable liquids. Breathing exhaust fumes can kill.
WARNING
Antivibration systems do not guarantee that you will not
sustain Hand-Arm Vibration Syndrome (HAVS) or carpal tunnel
syndrome. Therefore, continual and regular users should
monitor closely the condition of their hands and ngers.
If any of the above symptoms appear, seek medical advice
immediately.
WARNING
If you are using any medical electric/electronic devices such
as a pacemaker, consult your physician as well as the device
manufacturer prior to operating any power equipment.
Unit / machine safety
• Inspect the entire unit/machine before each use. Replace
damaged parts. Check for fuel leaks and make sure all fasteners
are in place and securely tightened.
• Replace parts that are cracked, chipped or damaged in any way
before using the unit/machine.
• Make sure the safety guard is properly attached.
• Keep others away when making carburetor adjustments.
• Use only accessories as recommended for this unit/machine by
the manufacturer.
WARNING
Never modify the unit/machine in any way. Do not use your
unit/machine for any job except that for which it is intended.
Fuel safety
NOTE
• Empty the fuel tank before storing the tool. It is a must otherwise
fuel may corrode causing carburetor damage. It is recommended
that the fuel be emptied after each use. If fuel Is left In the tank,
store so fuel will not leak.
• Fuel contains highly ammable and it is possible to get the
serious personal injury when inhaling or spilling on your body.
Always pay attention when handling fuel. Always have good
ventilation when handling fuel inside building.
• Mix and pour fuel outdoors and where there are no sparks or
ames.
• Use a container approved for fuel.
• Do not smoke or allow smoking near fuel or the unit/machine or
while using the unit/machine.
• Wipe up all fuel spills before starting engine.
• Move at least 3 m away from fueling site before starting engine.
• Stop engine before removing fuel cap.
• Store unit/machine and fuel in area where fuel vapors cannot
reach sparks or open ames from water heaters, electric motors
or switches, furnaces. etc.
WARNING
Fuel is easy to ignite or get explosion or inhale fumes, so that
pay special attention when handling or lling fuel.
Blowing safety
• Operate power equipment only at reasonable hours-not
early in the morning or late at night when people might be
disturbed. Comply with times listed in local ordinances. Usual
recommendations are 9:00 a.m. to 5:00 p.m., Monday through
Saturday,
• Never direct discharge of air toward bystanders nor allow anyone
near the area of operation. Use care in directing discharge to
avoid glass enclosures, automobiles, etc.
• Stay alert for uneven sidewalks, holes in terrain or other unstable
condition when using the tool.
• Take all possible precautions when leaving the tool unattended
such as stopping the engine.
• Never operate the tool without guards, blow pipes or other
protective device in place. (If so equipped.)
• Use rakes and brooms to loosen debris before blowing.
• Keep others including children, animals, bystanders and helpers
outside the 15 m hazard zone. Stop the engine immediately if you
are approached.
•
Always keep the engine on the right side of your body. (Blower only)
• Keep rm footing and balance. Do not over-reach.
• Keep all parts of your body away from the mufer.
• Always carry a rst-aid kit when operating any power equipment.
Vacuuming safety
WARNING
• Do not vacuum anything that is burning or smoking, such as
cigarettes, matches, or hot ashes.
• Do not vacuum replace soot or ash. This is a very ne
dust which will disturb air stream in the bag and may cause
damage.
Maintenance safety
• Maintain the unit/machine according to recommended
procedures.
• Disconnect the spark plug before performing maintenance except
for carburetor adjustments.
• Keep others away when making carburetor adjustments.
• Use only genuine HITACHI replacement parts as recommended
by the manufacturer.
CAUTION
Do not disassemble the recoil starter. You may get a possibility
of personal injury with recoil spring.
Transport and storage
• Carry the unit/machine by hand with the engine stopped and the
mufer away from your body.
• Allow the engine to cool, empty the fuel tank, and secure the unit/
machine before storing or transporting in a vehicle.
• Empty the fuel tank before storing the unit/machine, It is
recommended that the fuel be emptied after each use. If fuel is
left in the tank, store so fuel will not leak.
• Store unit/machine out of the reach of children.
• Clean and maintenance the unit carefully and store it in a dry
place
• Make sure engine switch is off when transporting or storing.
If situations occur which are not covered in this manual, take
care and use common sense. Contact Hitachi Authorized Service
Centers if you need assistance.

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RB24E (SV)
MODEL
NGK BMR7A
23.9
Oiled foam filter system
By ANSI 68.0
By CEN 81.0
101
104
0.6
0.6
5.0
11.2
1.5
Specications
MODEL
NOTE
• With blower attachment specications.
• Equivalent noise level/vibration level are calculated as the time-weighted energy total for noise/vibration levels under various working
conditions with the following time distribution : 1/7 idle, 6/7 racing.
*All data subject to change without notice.
Engine Size (ml)
Spark Plug
Air Cleaner
Dry Weight (kg)
Fuel Tank Capacity (ℓ)
Sound pressure level LpA (dB(A))
by ISO 22868
Uncertainty (dB(A))
Sound power level LwA (dB(A))
by ISO 22868
Sound power level LwA (dB(A))
by 2000/14/EC
Vibration level (m/s2)
by ISO 22867
Uncertainty (m/s2)

- 5 -
RB24E (SV)
MODEL
NGK BMR7A
23.9
Oiled foam filter system
By ANSI 68.0
By CEN 81.0
101
104
0.6
0.6
5.0
11.2
1.5
Assembly procedures
WARNING
Make sure the engine is turned off/stopped and not hot before
assembly.
NOTE ; Safety future
If you try to open the dust cover (5) when engine is running, it will
automatically stop the engine. (Fig.3)
But never try to open the dust cover (5) when engine is running
even with this future, otherwise serious personal injury may occur.
1. Blower assembly
Blow pipes to main body (Fig. 1)
Inspect the main body and accessories.
Connect straight pipe (1) and other pipe(s) securely. (See page 1 )
Align groove (2) in straight pipe with projection (3) on blower
housing (or another pipe) and slide the pipe onto the blower
housing (or another pipe).
Rotate the pipe clockwise to lock it into place.
Fan headed pipe to straight pipe (Fig. 2)
• Align groove (2) on the fan headed pipe (4) and projection (3) on
2nd straight pipe (1) and rotate the fan head in place.
2. Vacuum assembly
Vacuum pipe to main body (Fig. 5)
• Loosen knob bolt (5). (Fig. 3)
• Align the arrow(11) on the vacuum pipe (10) and the arrow (8) on
the fan case (7) as shown Fig. 4. (Fig. 4, 5)
• Slide( ①) the vacuum pipe into the fan case, and then rotate( ②)
the vacuum pipe clockwise(9) as shown Fig. 4 until it clicks.(Fig. 4)
Bent pipe and dust bag to main body
• Connect bent pipe (12), Align groove (13) in bent pipe with
projection (3) on blower housing and slide the pipe onto the
blower housing. Rotate the pipe clockwise to lock it into place.
(Fig. 7)
• Connect the dust bag to the installed bent pipe by inserting the
thinner part of the pipe into the opening of the bag. Fasten the
adjuster (14) securely by taping the end of the sawn strap. (Fig. 8)
WARNING
Always connect dust bag (16) to bent pipe (12).
Never try to connect directly to main body (15), otherwise dust bag
might approach near exhaust of mufer and it might cause res or
injuries. (Fig. 9)
Operating procedures
Fuel (Fig. 10)
WARNING
• This unit is equipped with a two-stroke engine. Always run
the engine on fuel, which is mixed with oil. Provide good
ventilation, when fueling or handling fuel.
• Fuel contains highly ammable and it is possible to get the
serious personal injury when inhaling or spilling on your body.
Always pay attention when handling fuel. Always have good
ventilation when handling fuel inside building.
Fuel
• Always use branded 89 octane unleaded gasoline.
• Use genuine two-cycle oil or use a mix between 25:1 to 50:1,
please consult the oil bottle for the ratio or Hitachi Authorized
Service Centers.
• Only for the state of California at 50:1.
• If genuine oil is not available, use an anti-oxidant added quality
oil expressly labeled for air-cooled 2-cycle engine use (JASO FC
GRADE OIL or ISO EGC GRADE). Do not use BIA or TCW (2-stroke
water-cooling type) mixed oil.
• Never use multi-grade oil (10 W/30) or waste oil.
• Always mix fuel and oil in a separate clean container.
Always start by lling half the amount of fuel, which is to be used.
Then add the whole amount of oil. Mix (shake) the fuel mixture.
Add the remaining amount of fuel.
Mix (shake) the fuel-mix thoroughly before lling the fuel tank.
Fueling
WARNING
• Always shut off the engine and let it cool for a few minutes
before refueling.
• Slowly open the fuel tank, when lling up with fuel, so that
possible over-pressure disappears.
• Tighten the fuel cap carefully, after fueling.
• Always move the unit at least 3 m (10 ft.) from the fueling area
before starting.
• Do not smoke and/or allow ames or sparks near fuel when
handling or lling fuel.
•
Always wash any spilled fuel from clothing immediately with soap.
• Be sure to check for any fuel leaking after refueling.
Before fueling, clean the tank cap area carefully, to ensure that
no dirt falls into the tank. Make sure that the fuel is well mixed by
shaking the container, before fueling.
Starting the cold engine
CAUTION
Do not start if the pipe and dust cover are obstructed by the ground
or any other object.
1. Set ignition switch (17) to ON position. (Fig. 11)
*Push priming bulb (18) several times so that fuel ows through
the bulb or return pipe. (19) (Fig. 12)
2. Set choke lever to CLOSED position. (Fig. 13)
3. Pull recoil starter briskly, taking care to keep the handle in your
grasp and not allowing it to snap back. (Fig. 14)
4. When you hear the engine want to start, return choke lever to
RUN position (open). Then pull recoil starter briskly again.
WARNING
•
Never start or run the engine inside a closed room or building and/
or near the inammable liquid. Breathing exhaust fumes can kill.
• Do not allow the rope to snap back in and always hold the unit rmly.
NOTE
If engine does not start, repeat procedures from 2 to 4.
5. After starting engine, allow the engine about 2-3 minutes to
warm up before subjecting it to any load.
Starting the warm engine
Use only 1 and 3 of the starting procedure for cold engine.
If the engine dose not start, use the same starting procedure
as for a cold engine.
Operating blower (Fig. 15)
• A low speed should be used to blow leaves and dry grass.
• A medium speed should be used to clean wet leaves and grass.
• A high speed should be used when moving gravel, dirt or other
heavy materials.
WARNING
• Do not direct discharge of air toward people or pet.
• The unit should be operated in a well ventilated area.
• Never perform assembly or disassembly procedures with
engine running or serious personal injury may result.
• Never touch mufer, spark plug, or other metallic parts while
engine is in running or immediately after shutting off engine.
CAUTION
This blower has been designed and adjusted to be used with all
blowing pipes attached (See page 1). It must never be operated
without the straight pipe, and fan headed pipe.
Operating vacuum (Fig. 16)
WARNING
Do not vacuum bottles, cans or any other hard materials, which
may cause damage or serious injuries.
• Do not use a bag with holes or tears in it. Even a small hole can
cause a lot of dust to come out. Repair or replace it immediately.
• Make sure zipper of the bag is completely closed.
• Wear shoulder strap over right or left shoulder.
• Make sure bevel at end of suction pipe faces downward.
• The unit should be operated In a well ventilated area.
• Use rakes and brooms to loosen debris before vacuuming.
•
A low speed should be used to vacuum small leaves and dry grass.
•
A medium speed should be used to vacuum large leaves and grass.
•
A high speed should be used to vacuum larger or wet leaves and grass.
• Dispose of debris in the bag more frequently in dusty condition.
NOTE
When you hear or feel strange sound or vibration, stop engine
immediately and check if anything blocks fans or pipes, If so,
remove it and check for damage.
Stopping (Fig. 17)
Decrease engine speed and run at an idle for a few minutes, then
turn off ignition switch.
NOTE
If the engine dose not stop, it can be forced to stop by setting
the choke lever to CLOSED position.
Before restarting the engine, ask Hitachi Authorized Service Centers
for repairs.

- 6 -
Maintenance
MAINTENANCE, REPLACEMENT OR REPAIR OF THE
EMISSION CONTROL DEVICES AND SYSTEMS MAY
BE PERFORMED BY ANY NON-ROAD ENGINE REPAIR
ESTABLISHMENT OR INDIVIDUAL.
Carburetor adjustment (Fig. 18)
In the carburetor, fuel is mixed with air. When the engine is test run
at the factory, the carburetor is adjusted. A further adjustment may
be required, according to climate and altitude. The carburetor has
one adjustment possibility:
T = Idle speed adjustment screw.
Idle speed adjustment (T)
Check that the air lter is clean. If adjustment is required, turn
IDLE speed Adjustment Screw (T) close (clockwise) to increase
engine speed, open (counterclockwise) to decrease engine speed.
Standard Idle rpm is 2800-3200rpm.
CAUTION
The above adjusting procedure must be followed when adjustment
is MADE or DAMAGE to engine will occur because of the incorrect
condition.
NOTE
Some models sold areas with strict exhaust emission regulation
do not have high and low speed carburetor adjustments. Such
adjustments may allow the engine to be operated outside of their
emission compliance limits. For these models, the only carburetor
adjustment is idle speed.
RECOMMENDATION:
CARBURETOR ADJUSTMENT NEEDS THE SKILL OF
EXPERIENCED OR WELL TRAINED PEOPLE, OR IS
RECOMMENDED TO TAKE THE UNIT TO Hitachi Authorized
Service Centers.
Air lter (Fig. 19)
The air lter must be cleaned from dust and dirt in order to avoid:
• Carburetor malfunctions.
• Starting problems.
• Engine power reduction.
• Unnecessary wear on the engine parts.
• Abnormal fuel consumption.
Remove the air cleaner cover by pushing and pulling back the tab
on the top.
Cleaning the air lter
Clean the cleaner element every day or every 8 hours of operation.
More frequent cleaning is recommended under very dusty
conditions. Wash the element in liquid detergent and water.
Squeeze the element to remove the dirt. Press the element in a dry
rag until it is completely dry. Saturate the element in 2 cycle oil.
Squeeze the element to distribute the oil completely and to remove
any excess oil. Replace the element and install the cover. (Fig. 20)
An air lter that has been used for some time cannot be cleaned
completely. Therefore, it must regularly be replaced with a new
one. A damaged lter must always be replaced.
Fuel lter (Fig. 21)
Drain all fuel from fuel tank and pull fuel lter line from tank. Pull
lter element out of holder assembly and rinse element in warm
water with detergent. Rinse thoroughly until all traces of detergent
are eliminated. Squeeze, do not wring, away excess water and
allow element to air dry.
NOTE
If element is hard due to excessive dirt buildup, replace it.
Spark plug (Fig. 22)
The spark plug condition is inuenced by:
• An incorrect carburetor setting.
• Wrong fuel mixture (too much oil in the gasoline)
• A dirty air lter.
• Hard running conditions (such as cold weather).
These factors cause deposits on the spark plug electrodes, which
may result in malfunction and starting difculties. If the engine
is low on power, difcult to start or runs poorly at idling speed,
always check the spark plug rst. If the spark plug is dirty, clean it
and check the electrode gap. Re-adjust if necessary. The correct
gap is 0.6 mm. The spark plug should be replaced after about 100
operation hours or earlier if the electrodes are badly eroded.
NOTE
In some areas, local law requires using a resistor spark plug to
suppress ignition signals. If this machine was originally equipped
with resistor spark plug, use same type of spark plug for
replacement.
Maintenance schedule
Below you will nd some general maintenance instructions. For
further information please contact Hitachi Authorized Service
Centers.
Daily maintenance
• Clean the exterior of the unit.
• Check that the air intake at the dust cover is not clogged.
• Check the dust cover for damage or cracks. Change the cover in
case of impacts or cracks.
• Check that nuts and screws are sufciently tightened.
Weekly maintenance
• Check the starter, especially cord.
• Clean the exterior of the spark plug.
• Remove it and check the electrode gap. Adjust it to 0.6 mm, or
change the spark plug.
• Clean the air lter.
Monthly maintenance
• Rinse the fuel tank with gasoline, and clean fuel lter.
• Clean the exterior of the carburetor and the space around it.
Quarterly maintenance
• Clean the cooling ns on the cylinder.
• Clean the fan and the space around it.
• Clean the mufer of carbon.
CAUTION
Cleaning of cylinder ns, fan and mufer shall be done by a
Hitachi Authorized Service Centers.
NOTE
When ordering the parts to your nearest dealer, please use
the item No. showing on the parts breakdown section in this
instruction.

- 7 -
RB24E (SV)
B
B
ENGINE
13
12
14
15
16
43
38
41
42
39
40
52
53
54
56
57
64
65
66
67
68
69
70
71 72
50
51
55
12
1
2
3
4
5
6
7
8
9
10
11
58
59
60
61
62
63
73
74
75
76
77
78
79
80
81
82
81
80
83
44
46
24
26
82 28
33
35
29
36
30
31
32 37
45
47
48
19
20
34
22

- 8 -
BLOWER
RECOIL STARTER VACUUM
122
How to connect wires into Terminal
Green/Yellow
123
124
125
127
128
130
131
121
122
133 134
160
136
138
137
139
140
141
142
143
145
146
147
155
150
153
154
152
156
159
162
161
501
157
126
149
151
132
135
129
158
163
144
148
164
164
136 59
58
Green/Yellow
136
125
141
206
211
220
221
222
210
208
209
204
205
201
207
202
203
200
RB24E (SV)

207
Code No E99252011
Printed in China
Shinagawa Intercity Tower A, 15-1, Konan 2-chome,
Minato-ku, Tokyo 108-6020, Japan