Maintenance Of Saw Chain And Guide Bar - Zenoah G2500 Owner's Manual

11. Maintenance of Saw Chain and Guide Bar

■ Saw Chain
WARNING
It is very important for smooth and safe operation to
always keep the cutters sharp.
The cutters need to be sharpened when:
• Sawdust becomes powder-like.
• You need extra force to saw in.
• The cut path does not go straight.
• Vibration increases.
• Fuel consumption increases.
Cutter setting standards:
WARNING
Be sure to wear safety gloves.
Before filing:
• Make sure the saw chain is held securely.
• Make sure the engine is stopped.
• Use a round file of proper size for the chain.
Chain type: 91PX / 25AP
File size: 5/32 in (4.0 mm)
Place the file on the cutter and push straight forward.
Keep the file position as illustrated.
After each cutter has been filed, check the depth gauge
and file it to the proper level as illustrated.
Appropriate gauge checker
0.025" (0.64 mm)
Depth gauge standard
01-G2500･G2500 ops_GB_306＿四.indd 17
<91PX>
Make the shoulder round
WARNING
Be sure to round off the front edge to reduce the chance
of kickback or tie-strap breakage.
Make sure every cutter has the same length and edge
angles as illustrated.
Cutter length
Filing angle
(25AP) 85 °
(91PX) 80 °
Side plate angle
(91PX) 55 °
(25AP) 60 °
Top plate cutting angle
■ Guide Bar
• Reverse the bar occasionally to prevent partial
wear.
• The bar rail should always be square. Check for wear
of the bar rail. Apply a ruler to the bar and the outside
of a cutter. If a gap is observed between them, the
rail is normal. Otherwise, the bar rail is worn. Such
a bar needs to be corrected or replaced.
Ruler
Gap
No gap
Chain tilts
WARNING:
This saw is equipped with one of the following low
kickback bar/chain combinations:
Bar Size Guide Bar
10 2475-52111
10 2475-52121
G2500/G2500 OPS
G
B
Zenoah Part Number
Saw Chain
580703501 (91PX)
3622-52210 (25AP)
GB-17
13.7.4 5:43:58 PM