Repair And Maintenance Guide; Precautions On Maintenance, Inspection And Repair; Inspection Standards And Spark Plug Replacement - Hitachi CS 33EB Service Manual

REPAIR AND MAINTENANCE GUIDE

This section describes necessary repair by focusing on portions requiring frequent repair. Refer to the
previous section (TROUBLESHOOTING GUIDE) in connection with the following content.

1. Precautions on Maintenance, Inspection and Repair

○The fuel used readily ignites; therefore, never bring the product near a flame or heat source.
○ Use new gaskets at reassembly.
○ Prior to disassembly for repair, pour the fuel and chain oil into separate containers for removal, and allow
the engine to cool down.
○ When performing repair, startup or actual operation, be particularly careful around portions posing the risk
of burn injury or electric shock, such as hot areas including the muffler, high voltage cord and spark plug.
○ Before operating the product with the chain 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 completing repair, always return the throttle lever to the idling position and set the stop switch to the
engine stop position.

2. Inspection Standards and Spark Plug Replacement

Idling revolutions
No-load maximum revolutions
(with guide bar and saw chain)
Clutch engagement
Accelerating performance
Gap between magneto rotor and ignition coil
Spark plug
Gap between spark plug electrodes
Height of carburetor metering lever
Type of saw chain
Saw chain pitch x gauge
No. of saw chain drive links
Item
min
min
min
-2-
CS 33EB/CS 33EB (P)
-1
(rpm) 2,900 to 3,300
-1 (rpm)
-1
(rpm) 3,900 to 5,000
― Smooth acceleration
mm
― NGK BPMR6A or NGK BPM6A
mm
Position 1.5 mm lower than
―
carburetor body surface
inch OREGON 91VG
―
― 45 (12"), 52 (14"), 57 (16")
12,500
0.3 to 0.4
0.6 to 0.7
3/8 x 0.05