Hitachi CS 27EPA (S) User manual

Pole Saw
Model CS 27EPA (S)
Handling instructions
Note:
Before using this machine, carefully read through these HANDLING INSTRUCTIONS
to ensure efficient, safe operation. It is recommended that these INSTRUCTIONS be
kept readily available as an important reference when using this machine.
000BookCS27EPA(S)Eng.indb1000BookCS27EPA(S)Eng.indb1 2014/06/0415:14:262014/06/0415:14:26

2
All overhead electrical conductors and
communications wires can have electricity flow
with high voltages. Never touch wires directly or
indirectly when pruning, otherwise serious
injury or death may result
Keep all children, bystanders and helpers 15 m
away from the unit. If anyone approaches you,
stop the engine and cutting attachment imme-
diately.
15 m
MEANINGS OF SYMBOLS
NOTE: Some units do not carry them.
Symbols
WARNING
The following show symbols used for the machine. Be sure that you understand their meaning before use.
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.
Read, understand and follow all warnings
and instructions in this manual and on
the unit.
Always wear eye, head and ear protectors
when using this unit.
Choke – Run position (Open)
Choke – Start position (Closed)
Emergency stop
Hot surface
Before using your machine
• Read the manual carefully.
• Check that the cutting equipment is correctly assembled and adjusted.
• Start the unit and check the carburetor adjustment. See “MAINTENANCE”.
Index
WHAT IS WHAT ................................................................................ 3
WARNINGS AND SAFETY INSTRUCTIONS .................................. 4
SPECIFICATIONS ............................................................................ 5
ASSEMBLY PROCEDURES............................................................. 5
OPERATING PROCEDURES........................................................... 7
MAINTENANCE................................................................................ 9
000BookCS27EPA(S)Eng.indb2000BookCS27EPA(S)Eng.indb2 2014/06/0415:14:262014/06/0415:14:26

3
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. Cutting attachment
5. Drive shaft tube
6. Handle bar
7. Priming pump
8. Ignition switch
9. Guide bar
10. Throttle trigger lockout
11. Choke lever
12. Engine
13. Angle transmission
14. Handle grip
15. Saw chain
16. Guide bar cover
17. Suspension eyelet
18. Oil tank cap
19. Combi box spanner
20. Handling instructions
20
19
16
12
1
3
8
18
9
10
5
13
11
2
15
7
6
4
17
14
000BookCS27EPA(S)Eng.indb3000BookCS27EPA(S)Eng.indb3 2014/06/0415:14:272014/06/0415:14:27

4
WARNINGS AND SAFETY INSTRUCTIONS
Operator safety
○Always wear head protection with full face shield to help protect
against falling branches and debris.
○Avoid all power lines. This unit is not insulated against electrical
current.
○Gloves should be used when sharpening chain.
○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
influence 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 offengine.
○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 cutting equipment.
○Do not grab or hold the unit by the cutting equipment.
○When the unit is turned off, make sure the cutting attachment
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
(HAVS) which is caused by vibration.
○The operator must obey the local regulations of cutting area.
WARNING
○Antivibration systems do not guarantee that you will not sustain
Hand-Arm Vibration Syndrome or carpal tunnel syndrome.
Therefore, continual and regular users should monitor closely
the condition of their hands and fingers. If any symptoms of the
above appear, seek medical advice immediately.
○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.
○Keep others away when making carburetor adjustments.
○Use only accessories as recommended for this unit / machine by
the manufacturer.
○Never let the chain strike any obstacle.
If the chain makes contact, the machine should be stopped and
checked carefully.
○Make sure the automatic oiler is working. Keep the oil tank filled
with clean oil. Never let chain run dry on the bar
○All unit service, other than the items listed in the operator's / owner's
manual, should be performed by Hitachi Authorized Service
Centers. (For example, if improper tools are used to remove the
flywheel or if an improper tool is used to hold the flywheel in order
to remove the clutch, structural damage to the flywheel could occur
and could subsequently cause the flywheel to burst.)
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
○Mix and pour fuel outdoors and where there are no sparks or
flames.
○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.
○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 and fuel in area where fuel vapors cannot
reach sparks or open flames 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 filling fuel.
Cutting safety
○Do not cut any material other than wood or wooden objects.
○For respiratory protection, wear an aerosol protection mask
when cutting the wood after insecticide has been applied.
○Keep others including children, animals, bystanders and helpers
outside the 15 m hazard zone. Stop the engine immediately if
you are approached.
○Hold the unit / machine firmly with both hands.
○Keep firm footing and balance. Do not over-reach.
○Keep all parts of your body away from the muffler and cutting
attachment when the engine is running.
○Before pruning branches, the operator must be accustomed to
the pruning techniques of the machine.
○Be sure to pre-plan a safe exit from falling objects.
○While cutting, hold the machine firmly with both hands with
thumb firmly locked around front handle, and stand with feet well
balanced and your body balanced.
○Be alert against kickback (when saw kicks up and back at
operator). Never cut with the nose of the bar.
○When relocating to a new work area, be sure to shut offthe
machine and ensure that all cutting attachments are stopped.
○Never place the machine on the ground when running.
○Always ensure that the engine is shut offand any cutting
attachments have completely stopped before clearing debris or
removing grass from the cutting attachment.
○Always carry a first-aid kit when operating any power equipment.
○Never start or run the engine inside a closed room or building
and/or near inflammable liquids. Breathing exhaust fumes can
kill.
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
muffler 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 maintain the unit carefully and store it in a dry place.
○Make sure engine switch is offwhen transporting or storing.
○When transporting in a vehicle, cover chain with chain cover.
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. 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.
000BookCS27EPA(S)Eng.indb4000BookCS27EPA(S)Eng.indb4 2014/06/0415:14:272014/06/0415:14:27

5
SPECIFICATIONS
Model CS27EPA (S)
Engine Size (cm3)26.9
Spark plug CHAMPION CJ6
Fuel tank capacity (cm3)520
Chain Oil Tank Capacity (cm3)160
Dry Weight (kg)
(Without guide bar and chain) 5.6
Guide bar length (mm) 250
Chain pitch (mm) 9.52
Chain gauge (mm) 1.09
Sound pressure level LpA (dB (A)) by ISO 11680
Equivalent
Uncertainty
89
3
Sound power level LwA (dB (A)) by ISO 11680
Measured
Uncertainty
Sound power level LwA (dB (A)) by 2000/14/EC
Measured
Guaranteed
105
3
108
111
Vibration level (m/s2) by ISO 11680
Front handle
Rear handle
4.9
9.2
Max. engine power by ISO 8893 (kW) 0.9
Max. engine speed (min-1) 11000
Idle engine speed (min-1) 3000
NOTE: Equivalent noise level / vibration levels by ISO 11680 are calculated as the time-weighted energy total for noise / vibration levels under
various working conditions with the following time distribution: 1/2 idle, 1/2 racing speed.
* All data subject to change without notice.
ASSEMBLY PROCEDURES
Drive shaft to engine (Fig. 1)
Loosen tube locking bolt (1) about ten turns so that the bolt point
will not obstruct drive shaft tube to be inserted. When inserting drive
shaft tube, hold the tube locking bolt outward preventing inside fitting
from obstructing as well.
Insert the drive shaft into the clutch case of the engine properly until
the marked position (2) on the drive shaft tube meets the clutch case.
1
2
Fig. 1
NOTE
When it is hard to insert drive shaft up to the marked position on
the drive shaft tube, turn drive shaft by the cutter mounting end
clockwise or counter-clockwise. Tighten tube locking bolt lining
up the hole in the shaft tube. Then tighten clamp bolt securely.
Cutting attachment to drive shaft (Fig. 2)
Loosen tube locking bolt (3).
Insert the drive shaft into the gear case of the attachment properly
until the marked position (4) on the drive shaft tube meets the gear
case.
3
4
5
Fig. 2
Installation of handle (Fig. 3)
Attach the handle to the drive shaft tube with the angle towards the
engine.
Adjust the location to the most comfortable position before operation.
Fig. 3
000BookCS27EPA(S)Eng.indb5000BookCS27EPA(S)Eng.indb5 2014/06/0415:14:272014/06/0415:14:27

6
Throttle wire / stop cord
Press the upper tab (6) and open the air cleaner cover. (Fig. 4)
Connect stop cords. (Fig. 5)
6
Fig. 4
Fig. 5
If the throttle outer end (7) is threaded on your unit, screw it and the
earth terminal (8) (if so equipped) into the cable adjuster stay (9) all
the way, and then tighten this cable end using the adjuster nut (10)
against the cable adjuster stay (9).
Connect throttle wire end (11) to carburetor (12) and install swivel
cap (13) (if so equipped) where is included in tool bag, onto swivel
(12) (Fig. 6).
Some models may come with the parts installed.
12
10
13
9
8
7
11
Fig. 6
WARNING
Never try to start engine without side case securely fastened.
NOTE
When assembling brand new unit, take offand discard a piece of
cardboard (14) between gear case and side case. (Fig. 7)
14
Fig. 7
Installation of bar and chain
1. Remove chain bar clamp nuts (15).
2. Remove the side case (16). (Fig. 8)
15
16
Fig. 8
3. Install the chain bar (17) onto the bolts (18), then push it toward
the sprocket (19) as far as it will go. Make sure that the boss of
chain tension adjust bolt (20) fits into the hole (21) of the bar.
(Fig. 9)
20
19
18
17
21
Fig. 9
NOTE
Slightly move the bar back and forth and make sure the chain
tension boss (20) fits into the hole (21) in the bar properly.
4. Confirm the direction of saw chain (22) is correct as in the figure,
and align the chain on the sprocket. (Fig. 10)
15
16
22
Fig. 10
5. Guide the chain drive links into the bar groove all around the bar.
6. Install the side case (16) onto the guide bar clamp bolt. Then fix
the clamp nut (15) temporarily. (Fig. 10)
7. Raise the bar end, and tighten the chain (22) by turning the
tension adjustment bolt (23) clockwise. To check proper tension,
lightly lift up the center of chain and there should be about
0.5 –1.0 mm clearance (24) between bar and edge of drive link.
(Fig. 11, 12)
Fig. 11
000BookCS27EPA(S)Eng.indb6000BookCS27EPA(S)Eng.indb6 2014/06/0415:14:272014/06/0415:14:27

7
0.5 – 1
mm
23 22
24
Fig. 12
CAUTION
PROPER TENSION IS EXTREMELY IMPORTANT(Fig. 11, 12)
8. Raise the bar end and securely tighten the chain bar clamp nuts
with the box wrench. (Fig. 11)
9. A new chain will stretch so adjust the chain after a few cuts and
watch chain tension carefully for the first half hour of cutting.
NOTE
Check the chain tension frequently for optimum performance
and durability.
CAUTION
○When the chain is excessively tightened, the bar and chain will
be damaged rapidly. Conversely, when the chain is excessively
loosened, it may get out of the groove in the bar.
○Always wear gloves when touching the chain.
WARNING
During operation, hold chain saw firmly with both hands. A single
hand operation may cause serious injury.
OPERATING PROCEDURES
Fuel (Fig. 13)
A
B
Fig. 13
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 flammable 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.
○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 filing 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 filling the fuel tank.
Fueling
WARNING
○Always shut offthe engine before refueling.
○Slowly open the fuel tank, when filling up with fuel, so that
possible over-pressure disappears.
○Tighten the fuel cap carefully, after fueling.
○Always move the unit at least 3 m from the fueling area before
starting.
○Always wash any spilled fuel from clothing immediately with
soap.
○Be sure to check for any fuel leakage 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.
Chain oil (Fig. 14)
Fill up with chain oil (25). Always use good quality chain oil. When the
engine is running, the chain oil is automatically discharged.
25
1 cm
Fig. 14
NOTE
Add chain oil when its level lowers to one centimeter from
bottom, (Fig. 14)
ADJUSTMENT OF CHAIN OIL SUPPLY
The chain oil quantity discharged through the lubrication system is
factory-adjusted to the standard. Adjust the quantity in accordance
with the operating condition. The numbered label (26) describes
order of chain oil adjustment. (Fig. 15)
○Loosen the fixing screw (27) one turn. (Fig. 15)
○Turn the adjusting screw (28) clockwise to decrease the quantity
and turn it counter-clockwise to increase the quantity. (Fig. 16)
○Do not try to turn the screw (28) clockwise beyond 1 turn from
its most counter-clockwise position or the maximum quantity
discharged position.
○After adjustment has been made, tighten fixing screw (27).
(Fig. 15)
26
27
Fig. 15
000BookCS27EPA(S)Eng.indb7000BookCS27EPA(S)Eng.indb7 2014/06/0415:14:272014/06/0415:14:27

8
28
Fig. 16
NOTE
When you have lost the proper position of the screw (28), start
with the most counterclockwise position.
Starting
CAUTION
Before starting, make sure the cutting attachment does not
touch anything.
1. Set ignition switch (29) to ON position. (Fig. 17)
29
30
Fig. 17
* Push priming bulb (31) several times so that fuel flows through
return pipe. (Fig. 18)
31
Fig. 18
2. Set choke lever (51) to CLOSED position (A). (Fig. 19)
51
Fig. 19
3. Pull recoil starter briskly, taking care to keep the handle in your
grasp and not allowing it to snap back. (Fig. 20)
Fig. 20
4. When you hear the engine want to start, return choke lever to
RUN position (open) (B). Then pull recoil starter briskly again.
NOTE
If engine does not start, repeat procedures from 2 to 5.
5. Then allow the engine about 2 – 3 minutes to warm up before
subjecting it to any load.
Stopping (Fig. 21)
Decrease engine speed and run at an idle for a few minutes, then
turn offignition switch (29).
For models with an engine ignition switch, keep the ignition switch
pressed until the engine comes to a complete stop.
29
30
Fig. 21
WARNING
A cutting attachment can injure while it continues to spin after
the engine is stopped or power control is released. When the
unit is turned off, make sure the cutting attachment has stopped
before the unit is set down.
SAFE OPERATION
CAUTION
○Always wear gloves during operation or maintenance.
○Review the area to be trimmed. Look for hazards that could
contribute to unsafe conditions. DO NOT operate unit if any
wires (power, telephone, cable, etc.) are closer than 15M to any
part of the operator or unit. (Fig. 22)
15 m
Fig. 22
000BookCS27EPA(S)Eng.indb8000BookCS27EPA(S)Eng.indb8 2014/06/0415:14:272014/06/0415:14:27

9
○Spectator and fellow workers must be warned, and children and
animals prevented from coming nearer than 15M while the pole
saw is in use. (Fig. 23)
15 m
Fig. 23
○Avoid all power lines. This unit is not insulated against electrical
current.
○Always wear head protection with full face shield to help protect
against falling branches and debris. (Fig. 24)
Fig. 24
Pruning techniques
This attachment is designed for pruning small limbs and branches up
to 200 mm in diameter.
Follow these tips for successful operation.
○Plan cut carefully. Check direction branch will fall.
○Long branches should be removed in several pieces.
○Do not stand directly beneath branch being cut.
○When ready to cut: Hold "front cutting guide" against branch.
This will prevent whipping of the branch. DO NOT use back and
forth sawing action. (Fig. 24)
○Look out for branch immediately behind the branch being cut, If
blade hits rear branch damage to blade may occur. (Fig. 25)
Fig. 25
○Accelerate to full throttle.
○Apply a light cutting pressure.
○Ease cutting pressure when nearing end of cut to maintain
control.
○When pruning a limb 100 mm diameter or larger, cut as follows:
(Fig. 26)
1. Undercut 1/4 limb diameter near tree trunk.
2. Finish top cut slightly farther out on limb.
3. Flush cut stub at trunk.
1
2
Fig. 26
○DO NOT use for felling or bucking.
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. 27)
WARNING
○The cutting attachment may be spinning during carburetor
adjustments.
○Never start the engine without the complete clutch cover and
tube assembled! Otherwise the clutch can come loose and
cause personal injuries.
In the carburetor, fuel is mixed with air. When the engine is test run at
the factory, the carburetor is basically 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 filter is clean. When the idle speed is correct, the
cutting attachment will not rotate. If adjustment is required, close
(clockwise) the T-screw, with the engine running, until the cutting
attachment starts to rotate. Open (counter-clockwise) the screw
until the cutting attachment stops. You have reached the correct idle
speed when the engine runs smoothly in all positions well below the
rpm when the cutting attachment starts to rotate.
If the cutting attachment still rotates after idle speed adjustment,
contact your Hitachi Authorized Service Centers.
T
Fig. 27
NOTE
Standard Idle rpm is 2500 – 3000 min-1.
WARNING
When the engine is idling the cutting attachment must under no
circumstances rotate.
Air filter (Fig. 28)
The air filter must be cleaned from dust and dirt in order to avoid:
○Carburetor malfunctions
○Starting problems
○Engine power reduction
000BookCS27EPA(S)Eng.indb9000BookCS27EPA(S)Eng.indb9 2014/06/0415:14:272014/06/0415:14:27

10
○Unnecessary wear on the engine parts
○Abnormal fuel consumption
32
Fig. 28
Clean the air filter daily or more often if working in exceptionally
dusty areas.
Cleaning the air filter
Remove the air filter cover and the filter (32). Rinse it in warm soap
suds. Check that the filter is dry before reassembly. An air filter
that has been used for some time cannot be cleaned completely.
Therefore, it must regularly be replaced with a new one. A damaged
filter must always be replaced.
Fuel filter (Fig. 29)
Drain all fuel from fuel tank and pull fuel filter line from tank. Pull filter
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.
Fig. 29
NOTE
If element is hard due to excessive dirt build-up, replace it.
Chain oil filter (Fig. 30)
Remove the oil filter and thoroughly wash it in solvent.
Fig. 30
Spark plug (Fig. 31)
The spark plug condition is influenced by:
○An incorrect carburetor setting
○Wrong fuel mixture (too much oil in the gasoline)
○A dirty air filter
○Hard running conditions (such as cold weather)
These factors cause deposits on the spark plug electrodes, which
may result in malfunction and starting difficulties. If the engine is
low on power, difficult to start or runs poorly at idling speed, always
check the spark plug first. 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.
0.6 mm
Fig. 31
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.
Muffler (Fig. 32)
Remove the muffler and clean out any excess carbon from the
exhaust port or muffler inlet every 100 hours of operation.
Fig. 32
Cylinder (Engine cooling) (Fig. 33)
The engine is air cooled and air must circulate freely around engine
and over cooling fins on cylinder head to prevent overheating.
Every 100 operating hours, or once a year (more often if conditions
require) clean fins and external surfaces of engine of dust, dirt and oil
deposits which can contribute to improper cooling.
Fig. 33
000BookCS27EPA(S)Eng.indb10000BookCS27EPA(S)Eng.indb10 2014/06/0415:14:272014/06/0415:14:27

11
NOTE
Do not operate engine with engine shroud or muffler guard
removed as this will cause overheating and engine damage.
Oiler port (Fig. 34)
Clean the chain oiler port (33) whenever possible.
33
Fig. 34
Guide bar (Fig. 35)
Before using the machine, clean the groove and oiler port (34) in the
bar with the special gauge offered as an optional accessory.
34
Fig. 35
Side case (Fig. 36)
Always keep the side case and drive area clean of saw dust and
debris.
Fig. 36
Angle transmission (Fig. 37)
Check angle transmission or angle gear for grease level about every
50 hours of operation by removing the grease filler plug on the side
of angle transmission.
If no grease can be seen on the flanks of the gears, fill the
transmission with quality lithium based multipurpose grease up to
3/4.
Do not completely fill the transmission.
Fig. 37
Maintenance schedule
Below you will find some general maintenance instructions. For
further information please contact Hitachi Authorized Service
Centers.
Daily maintenance
○Clean the exterior of the unit.
○Clean the chain oil filter port.
○Clean the groove and oil filter port in the guide bar.
○Clean the side case of saw dust.
○Check that the saw chain is sharp.
○Check that the bar nuts are sufficiently tightened.
○Make sure that the chain transport guard is undamaged and that
it can be securely fitted.
○Check that nuts and screws are sufficiently tightened.
Weekly maintenance
○Check the starter, especially cord and return spring.
○Clean the exterior of the spark plug.
○Remove the spark plug and check the electrode gap. Adjust it to
0.6 mm or change the spark plug.
○Clean the cooling fins on the cylinder and check that the air
intake at the starter is not clogged.
○Clean the air filter.
Monthly maintenance
○Rinse the fuel tank with gasoline, and clean fuel filter.
○Clean chain oil filter.
○Clean the exterior of the carburetor and the space around it.
○Clean the fan and the space around it.
○Clean the muffler of carbon.
CHAIN SHARPENING
Parts of a cutter (Fig. 38, 39)
WARNING
Gloves should be used when sharpening chain.
37
35
38
41
40 43
39
36
42
Fig. 38
000BookCS27EPA(S)Eng.indb11000BookCS27EPA(S)Eng.indb11 2014/06/0415:14:272014/06/0415:14:27

12
45
46
44
47
Fig. 39
35. Top plate
36. Working corner
37. Side plate
38. Gullet
39. Heel
40. Chassis
41. Rivet hole
42. Toe
43. Depth gauge
44. Correct angle on top plate (degree of angle depends on chain
type)
45. Slightly protruding “hook” or point (curve on non-chisel chain)
46. Top of depth gauge at correct height below top plate
47. Front of depth gauge rounded off.
LOWERING DEPTH GAUGES WITH A FILE
1) If you sharpen your cutters with a file holder, check and lower the
depth.
2) Check depth gauges every third sharpening.
3) Place depth gauge tool on cutter. If depth gauge projects, file
it level with the top of the tool. Always file from the inside of the
chain toward an outside cutter. (Fig. 40)
Fig. 40
4) Round offfront corner to maintain original shape of depth gauge
after using depth gauge tool. Always follow the recommended
depth gauge setting found in the maintenance or operator
manual for your saw. (Fig. 41)
Fig. 41
GENERAL INSTRUCTIONS FOR FILING CUTTERS
File (48) cutter on one side of the chain from the inside out. File on
forward stroke only. (Fig. 42)
5) Keep all cutters the same length. (Fig. 43)
6) File enough to remove any damage to cutting edges (side plate
(49) and top plate (50)) of cutter. (Fig. 44)
48
48 48
Fig. 42
Fig. 43
49 50
Fig. 44
SHARPENING ANGLES FOR SHARPENING SAW CHAIN
1. Part Number 90SG-40
90PX-40
2. Pitch 3/8”
3. Depth Gauge Setting 0.025"
4. Side Plate Filing Angle 80°
5. Top Plate Angle 30°
6. File Guide Angle 90°
000BookCS27EPA(S)Eng.indb12000BookCS27EPA(S)Eng.indb12 2014/06/0415:14:272014/06/0415:14:27

13
A
B
C
5
4
5
6
7
8
10
11
16
15
17
13
2
13
9
12 13
14
15
19
42
43
44
45
49
48
50
51
52
53
18
55
54
56
57
56
11
60
61
62
63
64
59
63
62
65
66
67
68
69
71
72
73
74
75
76
3
77
78
79
70
64
46
47
21
22 25
27
35
36
37
20
32
23 26 28
29
30
31
33 34
38
39
40
41
24
58
A
B
C
111 112
113
114 115
116
117
9
118
119
120
121
122
123
124
125
126
131
130
128
133
139
135
138
136
137
140
143
144
141
145
101
102
103
104
105
106
107
108
109
110
142
127
129
134
132
000BookCS27EPA(S)Eng.indb13000BookCS27EPA(S)Eng.indb13 2014/06/0415:14:272014/06/0415:14:27

14
000BookCS27EPA(S)Eng.indb14000BookCS27EPA(S)Eng.indb14 2014/06/0415:14:272014/06/0415:14:27

15
ITEM
NO.
PART NAME Q’TY
1 CYLINDER COVER 1
2 HITACHI LABEL 1
3 SCREW 4×22/PS 4
4 MUFFLER COVER 1
5 SCREW 5×16/PS 2
6 HEX.HOLE BOLT 6×65 2
7 WASHER 6 2
8 MUFFLER (B) 1
9SEAL LOCK HEX. SOCKET
BOLT (W/WASHERS) M5×30 3
10 HEAT PROTECTION PANEL 1
11 HEX. HOLE BOLT 5×20S 8
12 SPARK PLUG BMR7A 1
13 COVER PACKING 2
14 SCAVENGING COVER (A) 1
15 HEX. HOLE BOLT 4×12WS 4
16 WASHER T1.6 2
17 SCAVENGING COVER (B) 1
18 CYLINDER GASKET 1
19 CYLINDER SET PN 1
20 SWIVEL 1
21 STOP RING 1
22 O-RING 1
23 PUMP GASKET 1
24 PUMP DIAPHRAGM 1
25 PUMP BODY ASS'Y 1
26 SPRING 1
27 CONTROL LEVER 1
28 DIAPHRAGM GASKET 1
29 PRIMING BODY 1
30 DIAPHRAGM COVER 1
31 THROTTLE SET SCREW 2
32 THROTTLE VALVE 1
33 O-RING 1
34 MAIN JET #32 1
35 INLET SCREEN 1
36 NEEDLE VALVE 1
37 HINGE PIN SET SCREW 1
38 HINGE PIN 1
39 METERING DIAPHRAGM 1
40 PRIMING PUMP COMP. 1
41 SET SCREW 4
42 INLET MANIFOLD GASKET 1
43 CARBURETOR INSULATOR
SET PN 1
44 SEAL LOCK HEX. SOCKET
BOLT M5×25 2
45 CARBURETOR GASKET 1
46 THROTTLE WIRE FIXING
PLAT 1
47 CARBURETOR GASKET 1
48 CARBURETOR ASS'Y 1
49 SWIVEL CAP 1
50 PLUS SCREW 5×60WS 2
51 CLEANER ELEMENT 1
52 CLEANER COVER 1
53 CLEANER ASS'Y 1
54 PISTON SET PN 1
55 PISTON RING 1
56 PISTON PIN CIRCLIP 2
57 PISTON PIN 1
58 NEEDLE BEARING 1
59 CRANK SHAFT COMP. 1
60 CRANK CASE ASS'Y 1
61 CRANK CASE GASKET 1
62 OIL SEAL TB 12227 2
63 BALL BEARING 6001C3 2
64 CRANKSHAFT WASHER 2
ITEM
NO.
PART NAME Q’TY
65 KNOCK PIN 4×12 2
66 STARTER PULLEY ASS'Y 1
67 STOP RING E-5 2
68 STARTER PAWL SPRING 2
69 STARTER PAWL 2
70 RECOIL STARTER BODY
ASS'Y 1
71 SET SCREW 1
72 CAM PLATE 1
73 DUMPER SPRING 1
74 STARTER ROPE REEL 1
75 RECOIL SPRING 1
76 RECOIL STARTER BODY
COMP. 1
77 STARTER ROPE 3.5×860 1
78 STARTER HANDLE 1
79 NAME PLATE 1
101 D4 TAPPING SCREW 4
102 HANDLE (B) 1
103 LOCK LEVER 1
104 LEVER 1
105 SPRING (A) 1
106 STOP SWITCH 1
107 STOP SWITCH CORD 2
108 PROTECTION TUBE 1
109 THROTTLE WIRE 1
110 HANDLE (A) 1
111 HEX. HOLE BOLT M5×12 1
112 HEX. HOLE BOLT M5×25/S 2
113 ANTI-VIBE RUBBER A 1
114 PIPE HOLDER (A) 1
115 PIPE HOLDER(B) 1
116 ANTI-VIBE RUBBER B 1
117 STOP RING C-12 OUTER 1
118 FAN CASE 1
119 CLUTCH DRUM COMP. 1
120 STEP BOLT 2
121 BENT WASHER 8 2
122 CLUTCH PLATE A 2
123 CLUTCH ASS'Y 1
124 CLUTCH WASHER B 2
125 HEX. NUT M8 1
126 WASHER M8 1
127 HEX. HOLE BOLT 4×18WS 2
128 EARTH CORD 1
129 IGNITION COIL ASS'Y 1
130 CORD 1
131 CORD 1
132 CORD 1
133 MAGNETO ROTOR COMP. 1
134 SHIELD TUBE ASS'Y 1
135 FUEL PIPE 1
136 TANK CAP ASS'Y 1
137 TANK CAP CHAIN 1
138 RETURN GROMMET 1
139 SPACER 1
140 TANK 1
141 STAND 1
142 FLANGE BOLT 2
143 PUMP FILTER BODY COMP 1
144 CLIP, 6.3 DIA. 1
145 FLANGE BOLT 1
161 LOOP HANDLE ASS'Y 1
162 HANDLE GRIP 1
163 HEX. NUT 6 2
164 BRAKE SHAFT WASHER 1
165 TAPPING SCREW 5×20 1
166 CAP (A) 2
ITEM
NO.
PART NAME Q’TY
167 LEVEL MARK 2
168 CAUTION PLATE HITACHI 1
169 LEVEL MARK 1
170 MAIN PIPE COMP. 1
171 DRIVE SHAFT 1829L 1
172 LIFTING METAL ASS'Y 1
173 HANDLE BRACKET A 1
174 BOLT 6×43/P 2
175 OIL ADJUSTMENT MARK 1
176 OIL TANK COVER 1
177 OIL TANK GASKET 1
178 O-RING P-5 2
179 8 PUSH NUT 1
180 STEP BOLT A 1
181 OIL PUMP COMP. 1
182 O-RING 1
183 O-RING 1.4 1
184 WASHER 2 1
185 OIL PUMP SPRING 1
186 OIL PUMP PISTON COMP. 1
187 O-RING P-15 1
188 OIL TANK CAP ASS'Y 1
189 SCREW 6×8 1
190 HEX. HOLE BOLT M5×22/S 1
191 MANUAL MARK 1
192 PINION 1
193 BALL BEARING 609 1
194 BALL BEARING 609Z ST 1
195 STOP RING C-9, OUTER 1
196 STOP RING C-24, INNER 1
197 STARTER PAWL WASHER 1
198 HEX. HOLE BOLT M5×10 1
199 BALL BEARING 627 C3 1
200 CAM 1
201 GEAR 1
202 BALL BEARING 638Z 1
203 STOP RING C-28, INNER 1
204 COLLER 1
205 SPROCKET COMP., 3/8 1
206 FLANGE NUT 6 1
207 SIDE COVER COMP. 1
208 SYMBOL MARK HITACHI 1
209 SMALL SCREW 4×12WS 4
210 COLLER 3 4
211 FILTER ASS'Y 1
212 OIL FILTER 1
213 WASHER 5 1
214 FUEL PIPE 3×5×60 1
215 FUEL PIPE 3×5×75 1
216 BANJO, OIL PUMP 1
217 OIL PUMP ADJUSTER 1
218 STOP RING E-6 1
219 OIL MARK 1
220 CASE 1
221 CHAIN TENSIONER ASS'Y 1
222 CHAIN BAR TIGHTENING
BOLT 1
223 GUIDE PLATE 1
224 CHAIN BAR KNOCK PIN 1
225 SAW CHAIN, 10 INCH, 3/8 1
226 CHAIN BAR 10 INCH 3/8 1
227 CHAIN BAR CLAMP NUT 1
501 COMBI. BOX SPANNER 13×19
MINUS 1
502 WRENCH 8×10 1
503 HEX. BAR WRENCH 4MM 1
504 GUIDE BAR COVER, 10 1
505 SHOULDER BELT 1
000BookCS27EPA(S)Eng.indb15000BookCS27EPA(S)Eng.indb15 2014/06/0415:14:282014/06/0415:14:28

Shinagawa Intercity Tower A, 15-1, Konan 2-chome,
Minato-ku, Tokyo, Japan
403
Code No. E99247113 NS
Printed in Japan
000BookCS27EPA(S)Eng.indb16000BookCS27EPA(S)Eng.indb16 2014/06/0415:14:282014/06/0415:14:28