Precautions On Maintenance, Inspection And Repair; Inspection Criteria For Each Section And Consumable Parts; Repair Guide - Hitachi CS 33EDT Service Manual

This section describes repair, focusing on portions requiring frequent repair. Refer to the previous section
(TROUBLESHOOTING GUIDE) as the context below follows it.

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
engine to cool down.
When performing 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 product with the chain bar and chain blades 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 criteria for each section and consumable parts

Item
Idling revolutions
No-load maximum revolutions
(with guide bar and chain blades)
Clutch engagement
Accelerating performance
Gap between magneto rotor and
ignition coil
Spark plug
Gap between spark plug electrodes
Height of the carburetor metering
lever
Chain blade type
Chain blade pitch x gauge
No. of chain blade drive links

REPAIR GUIDE

Model
-1
min (rev./min)
-1
min (rev./min)
-1
min (rev./min)
—
mm
—
mm
Position 1.65 mm lower than carburetor
—
body surface
—
inch
—
-9-
CS 33EDT/CS 33EDTP
2,800 to 3,200
11,500 to 13,000
4,200 or more
Smooth acceleration
0.2 to 0.4
NGK BPMR7A
0.6 to 0.7
Oregon 91VG
3/8 x 0.05
45 (12"), 52 (14")