Repair Guide; Precautions On Maintenance, Inspection And Repair; Inspection Criteria For Each Section And Consumable Parts - Hitachi CS 27EPAP(S) Service Manual

Pole saw
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This section describes troubleshooting and repair procedures for common phenomena that may occur
during pole saw operation. The procedures described here and in the "TROUBLESHOOTING GUIDE"
should be studied and referenced as needed to ensure efficient diagnosis and prompt repair of problems.

1. Precautions on maintenance, inspection and repair

• As the fuel used in the pole saw is highly flammable, carefully keep sources of fire out of the area.
Start the engine as described below, and when confirming operation, be sure to use mixed fuel of
gasoline and two-cycle oil at a ratio of 25 to 50 : 1).
• When the engine section is disassembled, always be sure to replace gaskets and oil seals with new
ones at reassembly.
• Before starting disassembly and repair, thoroughly drain all fuel from the unit into a suitable container.
• Always ensure that the engine has fully cooled down before attempting disassembly.
• When starting, operating or performing maintenance on the unit, always avoid touching hot portions of
the muffler and other hot components, high tension cable and spark plug; otherwise, you run the risk of a
serious burn injury or electric shock.
• Before starting the engine with the saw chain and the chain bar attached, make sure that there are no
other people nearby.
• Ensure proper ventilation when performing repair indoors or in other protected areas.
• Upon completion of repair, carefully confirm that all screws, nuts and bolts are properly tightened, the
throttle trigger returns properly to the idling position when released, and the engine stops when you set
the stop switch to the STOP position.

2. Inspection criteria for each section and consumable parts

The table below shows the inspection criteria to be applied during or after repair, and the consumable
parts.
Idling rotation speed
No-road max. rotation speed (after warming up)
[with chain bar and saw chain]
Clutch engagement
Engine acceleration
Clearance between external circumference of
magneto rotor and ignition coil ass'y
Europe, Russia, China, and Australia
Spark plug
Other regions
Gap between electrodes of the spark plug
Saw chain type
Saw chain pitch x gauge
Number of saw chain drive links

REPAIR GUIDE

Item
2,800 to 3,200 min
9,000 to 13,000 min
3,900 to 4,700 min
Smooth acceleration
9.53 mm (3/8 in.) x 1.09 mm (0.043 in.)
-3-
Standard value
-1
-1
-1
0.3 to 0.4 mm
NGK BMR7A
CHAMPION CJ6
0.6 to 0.7 mm
OREGON 90SG
40

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