Hitachi CS33EDP User manual

PRODUCT NAME
Hitachi Engine Chain Saw
Models CS 33EDP
CS33ED
International Sales Division
TROUBLESHOOTING GUIDE-----------------------------------------------------------------------------------------------1
1. Troubleshooting and correction-------------------------------------------------------------------------------1
REPAIR GUIDE------------------------------------------------------------------------------------------------------------------3
1. Precautions on maintenance, inspection and repair-----------------------------------------------------3
2. Inspection criteria for each section and consumable parts---------------------------------------------3
CONTENTS Page
LIST Nos.
CS 33EDP: F050
CS 33ED: F049
Mar. 2014
C

-1-
1. Troubleshooting and correction
Trouble Cause Corrective action
Starter
handle
cannot be
pulled.
The crank shaft does
not rotate.
Faulty piston ring Disassemble and
replace.
Seized piston and cylinder
Faulty crank shaft bearings
Magneto rotor contact with ignition coil
The recoil starter
does not rotate.
Broken recoil starter Inspect and replace.
Faulty starter pawl
Clogging of dirt in starter pawl Clean.
Startup is
impossible.
No compression Faulty piston ring Replace.
Worn piston
Worn cylinder
Short-circuited due to foreign matter between the spark plug
electrodes.
Remove foreign matter:
In case of frequent
occurrence, disassemble
and clean the engine.
No spark
Stop switch not at startup position Adjust to startup position.
Dirty or faulty spark plug Clean or replace.
Improperly connected plug cap Inspect and replace.
Disconnected or improperly connected
high voltage cord Repair or replace.
Ground connection of high voltage
cord Repair.
Disconnected or faulty ignition coil
ass’y Replace.
Large gap between the magneto rotor
circumference and ignition coil ass’y Adjust.
The spark plug does
not become wet with
fuel after repeated
starting operation.
No fuel in the fuel tank Add properly mixed fuel
(25:1 to 50:1).
Clogged fuel filter Clean or replace.
Faulty fuel pipe Adjust, replace or
connect.
Faulty vent hole (inner cap) on the fuel
tank Replace.
Faulty carburetor ass’y Adjust, clean or replace.
The spark plug is wet
due to excessive fuel
supplied.
Pulling the starter handle several
times while the choke lever is at the
“startup” position.
Dry the spark plug.
Remove excessive fuel.
Idling stops
although
startup is
possible.
Weak spark Dirty or faulty spark plug Clean or replace.
Improper air gap Adjust.
Low compression Worn piston ring Replace.Worn piston
Worn cylinder
Good spark and
compression
Revolutions too low for idling Adjust.
Poorly adjusted carburetor ass’y
Defective sealing of the packing Replace.
TROUBLESHOOTING GUIDE

-2-
Trouble Cause Corrective action
Starts, but
when
accelerating
…
The engine stalls. Clogged fuel filter Clean or replace.
Insufficient warm-up Warm up.
Poorly adjusted carburetor ass’y Adjust.
Poor acceleration;
no increase in
revolutions
Clogged cylinder vent passage,
exhaust port and/or carbon-clogged
muffler Clean.
Clogged air cleaner
Chain brake set on Release.
Poorly adjusted carburetor ass’y Adjust, clean or replace.
Starts, but
…
Fluctuating
revolutions at high
speed
Dirt-clogged high-speed fuel line Clean.
Defective sealing of the packing Replace.
Faulty carburetor ass’y Adjust, clean or replace.
Excessive fuel
consumption Clogged air cleaner Clean.
Poorly adjusted carburetor ass’y Adjust.
Chain oil is not discharged.
Insufficient amount of chain oil in the
oil tank Replenish chain oil in the oil tank.
Clogged chain oil discharge port Clean.
Clogged oil filler port on the guide bar
Clogged oil filter
Poor adjustment of chain oil discharge
amount Properly adjust the chain oil discharge amount.
Faulty oil pump Replace.
Use of high-viscosity chain oil (in cold
weather)
Use genuine or
low-viscosity chain oil
(for winter use).
Engine does not stop. Disconnection of cord Replace.
Faulty stop switch Replace.

-3-
This section describes repair, focusing on portions requiring frequent repair. See the TROUBLESHOOTING
GUIDE in the previous section as the context for the following descriptions.
1. Precautions on maintenance, inspection and repair
•The fuel used readily ignites; therefore, never bring the product near a flame.
•Use new gaskets at reassembly.
• Prior to disassembly for repair, remove the fuel and chain oil into separate containers, and allow the tool to
cool down.
• During repair, startup or running, use adequate care for portions posing the risk of burn injury or electric
shock, such as hot areas including the muffler, high voltage cord, and spark plug.
• Before running the tool with the guide bar and saw chain attached, make sure that there are no other
people nearby.
• Ensure proper ventilation when performing repair in a small room or other poorly ventilated space.
• After repair, confirm that the throttle lever returns to the idling state and the engine stops when the stop
switch is turned to the stop position.
2. Inspection criteria for each section and consumable parts
Model
Item CS 33EDP/CS 33ED
Idling revolutions 2,800 to 3,200 min-1
No-load maximum revolutions
(with guide bar and saw chain) 12,500 to 13,500 min-1
Clutch engagement 4,000 to 4,800 min-1
Accelerating performance Smooth acceleration
Gap between magneto rotor and
ignition coil ass’y 0.2 to 0.4 mm
Spark plug NGK BPMR7A
Gap between spark plug electrodes 0.6 to 0.7 mm
Saw chain type OREGON 91PX
Saw chain pitch x gauge 3/8” (9.53 mm) x 0.05” (1.27 mm)
No. of saw chain drive links 52 or 57
REPAIR GUIDE

-4-
Seized or broken piston ring Replace.
Seized piston or cylinder Replace.
Seized or broken needle bearing of the crank
shaft Replace.
Seized ball bearing Replace.
Magneto rotor contact with ignition coil Adjust.
Broken recoil starter Inspect/replace.
Faulty starter pawl Inspect/replace.
Clogging of dirt in starter pawl Clean.
Faulty piston ring Clean/replace.
Worn piston ring Replace.
Worn piston Replace.
Worn cylinder Replace.
Remove foreign matter. Disassemble/clean.
Stop switch not at startup position Set to startup
position.
Dirty or faulty spark plug Clean/inspect.
Improperly connected plug cap Inspect/replace.
Disconnected or improperly connected high
voltage cord and other wiring Inspect/replace.
Ground connection of high voltage cord and
other wiring Inspect.
Disconnected or faulty ignition coil Replace.
Excessive gap between magneto rotor
circumference and ignition coil Adjust.
No fuel in fuel tank or improper mixing ratio Add properly mixed
fuel (25:1 to 50:1).
Clogged fuel filter Clean/replace.
Bent fuel pipe Adjust.
Cracked fuel pipe Replace.
Fallen fuel pipe Connect.
Faulty tank vent hole (inner cap) Replace.
Faulty pump diaphragm of carburetor ass’y Replace.
Dirt-clogged carburetor ass’y Clean.
Poorly adjusted carburetor ass’y Adjust.
Pulling the starter handle several times while
the choke lever is at the “startup” position.
Dry the spark plug.
Remove excessive
fuel.
Re
p
air flowchart
Pull the starter handle.
Is pulling possible?
Remove the spark plug to
check for sparks.
Are sparks generated?
No
Is there compression?
Return the spark plug
and plug cap to the
original positions, and
then perform proper
startup operation.
Is the tip of the spark plug
wet with fuel?
Is the spark plug wet due
to excessive supply of
fuel?
No
Yes
No
No
Yes
No
Yes
Yes
No
Yes
Yes
Is the spark plug
contaminated with foreign
matter?

-5-
Dirty or faulty spark plug Clean/replace.
Defective air gap Adjust.
Worn piston ring Replace.
Worn piston Replace.
Worn cylinder Replace.
Expired oil seal service life Replace.
Revolutions low for idling Adjust.
Poorly adjusted carburetor ass’y Adjust.
Defective sealing of the packing Replace.
Revolutions low for idling Adjust.
Poorly adjusted carburetor ass’y Adjust.
Defective sealing of the packing Replace.
Revolutions too high for idling Adjust.
Worn or faulty clutch Inspect/replace.
Poorly adjusted carburetor ass’y Adjust.
Clogged fuel filter Clean/replace.
Inadequate warm-up, especially in cold
weather Warm up.
Poorly adjusted carburetor ass’y Adjust.
Defective sealing of the packing Replace.
Clogged cylinder vent passage, exhaust port
or carbon-clogged muffler Clean.
Clogged air cleaner Clean.
Chain brake set on Release.
Poorly adjusted carburetor ass’y Adjust.
Faulty carburetor ass’y pump diaphragm Replace.
Dirt-clogged carburetor ass’y Clean.
Dirt-clogged high-speed fuel line of the
carburetor ass’y Clean.
Air intake from the packing section Inspect.
Faulty carburetor ass’y pump diaphragm Replace.
Poorly adjusted carburetor ass’y Adjust.
Revolutions low for idling Adjust.
Poorly adjusted carburetor ass’y Adjust.
Defective sealing of the packing Replace.
Clogged air cleaner Clean.
Poorly adjusted carburetor ass’y Adjust.
Does the engine stop when
the speed rapidly decelerates
from high speed?
Yes
Yes
No
No
Yes
Does the engine stop by
pulling the throttle lever?
No
No
Does the speed increase
by pulling the throttle lever?
Are revolutions fluctuated
during acceleration?
Tilt the tool during idling.
Does the engine stop?
No Yes
Does the saw chain rotate
during idling?
Yes
No
Yes
Start the tool and set to
idling mode.
Does the engine stop?
Is fuel consumption
excessive?
Yes
No
No
Yes

-6-
Insufficient chain oil in the oil tank Supply oil.
Clogged chain oil discharge port Clean.
Clogged guide bar oil feed port Clean.
Clogged oil filter Clean.
Poorly adjusted chain oil discharge amount Adjust.
Defective oil pump Replace.
Use of high-viscosity chain oil
(in cold weather)
Use genuine or
low-viscosity chain
oil (for winter use).
Is chain oil discharged?
No

-7-
• Spark plug
• Checking for sparks
High voltage cord
Ignited sparks
Spark Plug Ass’y
BPMR7A [73]
Plug cap
Metallic portion of the engine
[Bold] numbers in the description below correspond to item numbers in the Parts List and exploded
assembly diagram for the Model CS 33EDP.
WARNING: Always stop the engine prior to disassembly or when replacing the saw chain.
1. Checking for sparks of the spark plug
CAUTION:
• Be careful not to touch the metallic portion of Spark
Plug Ass’y BPMR7A [73] when pulling the starter
handle; otherwise, you run the risk of electric shock.
Wear gloves to prevent electric shock.
• Carefully wipe off any fuel around the plug to avoid a
sudden flash of fire.
(1) Remove Spark Plug Ass’y BPMR7A [73] from the Cylinder
[74]. Use a wire brush to clean off carbon deposits on the
electrodes of Spark Plug Ass’y BPMR7A[73], as needed.
Adjust the gap between the electrodes if necessary. Use a
cloth to wipe off any fuel on the electrodes. Remove fuel left
in the Crank Case [96] by following the procedure below.
(a) Remove the Spark Plug Ass’y BPMR7A [73] from the
Cylinder [74].
(b) Open the Choke Lever [153], and then set the Stop
Switch [147] to the stop position.
(c) Open the throttle (by pulling the Throttle Lever [156]).
(d) Pull the starter handle several times.
(2) Insert Spark Plug Ass’y BPMR7A[73] into the Spark Plug
Cap [77], and then place the electrodes in contact with
the metallic portion of the engine. Under these conditions,
set the Stop Switch [147] to the startup position and pull
the starter handle.
(3) When all the above steps are completed normally, the electrodes of Spark PlugAss’y BPMR7A[73]
should make a snapping sound to generate sparks.
2. Adjustment of the carburetor
(1) Use the Idle Adjust Screw [12] to adjust the carburetor.
• Use this screw to adjust revolutions at idling. Turning the
screw clockwise increases engine revolutions; turning it
counterclockwise decreases engine revolutions.
(2) Standard setting of the carburetor
• 2,800 to 3,200 min-1
(Confirm that the saw chain does not rotate.)
(3) Fine adjustment
• Idling adjustment
(a) Adjust the idling revolutions after the engine is fully
warmed up.
(Tip on warm-up: Let the engine idle for one minute with the engine in half-throttled status.)
(b) Use the Idle Adjust Screw [12] to set revolutions so that the Saw Chain [132] does not start
rotating while the engine runs stably.
(c) Set idling revolutions to 2,800 to 3,200 min-1 by using the IdleAdjust Screw [12].
(Adjust to approx. 3,000 min-1.)
Inspection and repair procedures
Gap between
electrodes
(0.6 to 0.7 mm) Remove carbon here.
• Idle adjust screw
Idle Adjust Screw [12]
Revolutions
decrease.
Revolutions
increase.

-8-
• Cleaner and carburetor
1. Disassembly and reassembly of the cleaner and carburetor
[Tools required]
• Phillips screwdriver
• Hex. bar wrench (4 mm)
(1) Disassembly
• Loosen the Cleaner Knob [142] and remove the Cleaner Cover [141].
• Remove the Choke Lever [153].
• Pull out Cleaner Element (A) [5] and Cleaner Element (B) [4].
• Pull out the Fuel Pipes FKM [71] [163] from the Carburetor Ass’y [9], remove the Hex. Socket Hd.
Bolts M5 x 45 [6] by using a hex. bar wrench (4 mm), and then remove the Cleaner Support [8] and
Carburetor Ass’y [9].
• Remove the Fuel Pipe 2.5 x 4 x 90 [168] from the Carburetor Ass’y [9].
(2) Reassembly
Reassembly can be conducted by reversing the disassembly procedure. However, special attention
should be given to the following items.
• Do not bend the Fuel Pipes FKM [71] [163] and Fuel Pipe 2.5 x 4 x 90 [168]. (See “9. Connecting the
fuel pipes” for details.)
• Turn the Choke Lever [153] to “Close” and confirm that the Choke Lever [153] automatically returns to
“Open” and the choke valve of the Carburetor Ass’y [9] opens to the initial position when the Throttle
Lever [156] is operated.
• Confirm that the four Grommets [155] are securely mounted.
Disassembly and reassembly
Cleaner Knob [142]
Cleaner Cover [141]
Cleaner Element (B) [4]
Cleaner Element (A) [5]
Cleaner Support [8]
Hex. Socket Hd. Bolt M5 x 45 [6]
Carburetor Ass’y [9]
Choke Lever [153]
Fuel Pipe 2.5 x 4 x 90 [168]
Fuel Pipe FKM [163]
Fuel Pipe FKM [71]
Grommets [155] Washer 5 [7]

-9-
2. Disassembly and reassembly of the front handle
[Tools required]
• Phillips screwdriver
• Flat-blade screwdriver
• Box-end wrench 10 x 19 mm
• Socket wrench (10 mm)
(1) Disassembly
• Use a Phillips screwdriver to remove the two Tapping Screws (W/Flange) D5 x 25 (Black) [193]. Use
a flat-blade screwdriver to remove the Flange Nut M6 [165],and then use a box-end wrench 10 x 19
mm to remove the Front Handle [195].(See the figure “Tightening the Flange Nut M6 [165]” on the
next page.)
• Use a 10-mm wide box wrench (socket type) to remove the Antivibration Spring [161].
(2) Reassembly
Reassembly can be conducted by reversing the disassembly procedure. However, special attention
should be given to the following items.
• Reassemble the anti-vibration mechanism of the Front Handle [195] by following the procedure
below.
• Front handle
Front Handle [195]
Flange Nut M6 [165]
Spring Holder [159]
Damper Set Bolt [197]
Bolt Washer M6 [62]
A
ntivibration Spring [161]
S
p
rin
g
Cover
[
196
]
Tapping Screw (W/Flange)
D5 x 25 (Black) [193]