Hitachi CS 33EDP Service Manual page 4

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
Item
Idling revolutions
No-load maximum revolutions
(with guide bar and saw chain)
Clutch engagement
Accelerating performance
Gap between magneto rotor and
ignition coil ass'y
Spark plug
Gap between spark plug electrodes
Saw chain type
Saw chain pitch x gauge
No. of saw chain drive links
REPAIR GUIDE
Model
3/8" (9.53 mm) x 0.05" (1.27 mm)
-3-
CS 33EDP/CS 33ED
-1
2,800 to 3,200 min
-1
12,500 to 13,500 min
-1
4,000 to 4,800 min
Smooth acceleration
0.2 to 0.4 mm
NGK BPMR7A
0.6 to 0.7 mm
OREGON 91PX
52 or 57