Oregon Scientific Chain Saw, Qualcast PC40 Maintenance Manual

This Maintenance & Safety Manual supercedes and replaces

all previous Oregon

®

Maintenance & Safety Manuals

Printed in USA

F/N A106971 AG 0904

Oregon

®

Maintenance & Safety Manual

Maintenance & Safety Manual for

Saw Chain, Guide Bars, and Drive Sprockets

Blount, Inc.

Oregon Cutting Systems Group

4909 S.E. International Way (97222-4607)

P.O. Box 22127 • Portland, Oregon • 97269-2127

[phone]

www.oregonchain.com

Oregon Distribution Ltd.

Guelph, Ontario, Canada N1H 6L4

[phone]

www.oregonchain.ca

Read and follow all Chainsaw

Safety Warnings and

Important Safety Information.

OO

RR

EE

GG

OO

NN

SS

II

NN

CC

EE

11

99

44

77

★★

★★

★★

★

★★

★

★★

★

★

®

Maintenance and

Safety Manual

Saw Chain, Guide Bar and Drive Sprocket

25436_Cvr_2005.qxd 9/24/2004 2:35 PM Page 1

Chainsaw Safety

IMPORTANT SAFETY MESSAGE

SAFETY SYMBOL:

This safety symbol is used to highlight safety messages. When
you see this symbol, read and follow the safety message to
avoid severe personal injury.

GUARD AGAINST CHAINSAW KICKBACK

 Know your personal level of chainsaw experience.
 Know your cutting chain.

If you do not have experience and specialized training for
dealing with chainsaw kickback, then Oregon®urges you to
use only low-kickback saw chains which have this blue label.

Saw chains marked with a yellow label, such as the one below,
are not low-kickback and are intended for use only by profes­sional chainsaw operators.

ATTENTION: READ THIS

The chain in this box may be capable of

kickback that could result in serious injury
to the saw operator or bystanders. Do not use this chain unless you
have experience and specialized training for dealing with kickback.
Saw chain with reduced kickback potential is available.

WARNING

ATTENTION: READ THIS

This saw chain is low kickback chain.

It met the kickback performance
requirements of ANSI B175.1 when tested on a representative
sample of chainsaws. Its safety features significantly reduce the
hazard of kickback while maintaining high cutting performance.

ALL CUTTING CHAINS CAN KICK BACK, which may result in
severe personal injury to the saw operator or bystanders. Operate
your saw safely. Read all warnings in your chainsaw operator’s
manual.

 WARNING

There is a risk of serious injury to
the saw operator or bystanders.

All cutting chain can kick back, which can lead to dangerous
loss of control of the chainsaw and result in serious injury
to the saw operator or bystanders. Follow all instructions
in your chainsaw operator’s manual and in this booklet for
safe use and proper maintenance of your saw’s cutting
chain, guide bar, and sprocket. Get information from your
local chainsaw dealer as well if you are unsure about the
use or maintenance of your saw and its cutting attachments.

WARNING

ANSI Chain Chart

IMPORTANT SAFETY INFORMATION

OREGON®SAW CHAIN CLASSIFICATION CHART

Part numbers of Oregon®chain that comply with the ANSI low-kickback standard
are highlighted in blue. Packages of Oregon

®

low-kickback saw chain carry this

authorized UL

®

Classification Marking:

Part numbers of Oregon

®

chains that do not meet ANSI low-kickback performance
requirements are highlighted in yellow. The chains below should be used only by
those with experience and specialized training for dealing with kickback.

This Saw Chain Classification Chart supersedes and replaces all previous Oregon

®

Saw Chain

classification charts and posters. Effective September 1, 2004.

1/4" 25AP

.325" 20BP, 20LP, 33LG 21BP, 21LP, 34LG 22BP, 22LP, 35LG

MultiCut™ Chain: M20LP MultiCut™ Chain: M21LP MultiCut™ Chain: M22LP

Ripping Chain: 95R

3/8" Round-ground Chain: Round-ground Chain: Round-ground Chain:

72AP, 72DP, 72JG, 72LG, 73DP, 73JG, 73LG, 75DP, 75JG, 75LG

72JP, 72LP 73JP, 73LP 75JP, 75LP

MultiCut™ Chain: M72LP MultiCut™ Chain: M73LP MultiCut™ Chain: M75LP

Ripping Chain: 72RD Ripping Chain: 73RD Ripping Chain: 75RD

Square-ground Chain: Square-ground Chain:

72CJ, 72CJX, 72 CK, 72CKX 75CJ, 75CJX, 75CK, 75CKX,

72CL, 72CLX 75CL, 75CLX

3/8" Round-ground Chain: 91VS

90 Series MultiCut™ Chain: M91VS

.404" Round-ground Chain: Round-ground Chain:

26, 26P, 58J, 58L 27, 27A, 27P, 59J, 59L

Ripping Chain: 27R, 27RA

Square-ground Chain: Square-ground Chain:

58CJ, 58CL 59CJ, 59CK, 59CL

SAW CHAIN FOR PROFESSIONAL USERS

Chain Pitch .043"-gauge .050"-gauge .058"-gauge .063"-gauge

Part Number Part Number Part Number Part Number

.325" 33SL 34SL 35SL

Narrow-kerf 95VP

3/8" 72V 73V 75V

3/8" 91P, 91VG

90 Series Narrow-kerf 90SG Power Sharp

®

91LX

UNDERWRITERS LABORATORIES, INC.

CLASSIFIED LOW KICKBACK SAW CHAIN

®

In accordance with American National Standard Low-Kickback Safety
Requirements for Gasoline Powered Chainsaws (ANSI B175.1-2000),
Paragraph 5.11.2.4, the saw chain in this package is low-kickback saw
chain. It met the reduced kickback requirement of ANSI B175.1 when
tested on a representative sample of chainsaws. 17R2

ANSI-STANDARD LOW-KICKBACK SAW CHAIN

C

L

A

S

S

I

F

I

E

D

U

L

25436_Cvr_2005.qxd 9/20/2004 2:47 PM Page 2

Chainsaw Safety

WHAT IS KICKBACK?

Kickback is the violent backward and/or upward motion of the
chainsaw guide bar occurring when the chain near the nose or
tip of the guide bar contacts any object, such as another log
or branch, or when the wood closes in and pinches the saw
chain in the cut.

BE AWARE OF KICKBACK

1. Be alert at
all times to
guard against
a possible
kickback
reaction.
Always be
aware of the
position of your bar’s nose.

2. Different models of cutting chain are available for most
cutting tasks. Use the chain suitable for your type of
cutting, with the lowest kickback potential.

3. Narrow-nose bars, such as Oregon®Double Guard

®

bars, are recommended for maximum kickback safety.

WEAR PROPER CLOTHING

AND PROTECTIVE EQUIPMENT

Dress properly – do not wear clothing that is too
tight or too loose.

NOTE

Wear hard hat to
protect head.

Wear gloves to prevent
slippage and to protect
hands.

Wear heavy boots to
protect legs and feet.

Wear protective chaps
to protect legs.

Wear ear muffs or plugs
to protect ears.

Wear safety goggles or
face shield to protect eyes.

POTENTIAL KICKBACK SITUATION

Chainsaw Safety,

(Continued)

MAKE PROPER WORK PRACTICES A HABIT

CAUTION

 Keep yourself clear of the work. Before cutting:

-

Calculate how the object being cut will fall.

-

Determine if the saw may be pinched during the cut.

-

Calculate whether the saw may be thrown unexpectedly
by the movement of the cut material.

-

Position yourself to avoid injury.

 Never cut above shoulder level.
 Never cut while in a tree, or while on a ladder.
 Keep others away from the cutting area. Do not allow

others to hold wood during cutting.

FOR ADDITIONAL COPIES OF THIS MANUAL

Contact:

Oregon Cutting Systems Division, Blount, Inc.

Attention: Dept. 18A

4909 S.E. International Way

P.O. Box 22127

Portland, OR 97269-2127 U.S.A. [phone]

www.oregonchain.com

 Use only a right-

handed grip to
hold your saw
(right hand on
the trigger, left
hand on the
front handle).

 Keep your left

arm straight
for better
control.

 Hold saw firmly

with both hands.
Keep thumb firmly
locked under front
handle.

 Stand to the side

of the chainsaw,
never behind it.

 Run engine at

full throttle.

 Use low-kickback

saw chain and a
reduced-kickback
guide bar.

 Keep the chainsaw,

cutting chain,
guide bar, and
sprocket properly
maintained.

 Stand with feet

well braced and
your body bal­anced.

 Cut only wood

with your chainsaw.
Do not cut any
other material.

Introduction/Contents

Your chainsaw is only as good as your chain, guide bar,
and sprocket. They function as a team while cutting wood
and must be maintained as a team.

A properly maintained chain, bar, and sprocket will provide
excellent cutting performance. An improperly maintained
chain will cause damage to the bar and sprocket, will cut
poorly, and will create potential safety hazards.

This manual addresses the maintenance of only Oregon

®

manufactured chains, bars, and sprockets. For information on
maintenance and operation of your saw, refer to your saw’s
operator’s manual or contact your local chainsaw dealer.

SYMBOLS

End Use Symbols . . . . . . . . .2

Five Oregon®Symbols
for Periodic Maintenance . . .3

CHAIN

Chain Terms . . . . . . . . . . .4, 5

Chain Pitch . . . . . . . . . . .4

Chain Gauge . . . . . . . . . .4

Parts of a Cutter . . . . . . .4

Cutter Sequence . . . . . . .4

Parts of a Saw Chain . . . .5

Maintenance Terms . . . . .5

Chain Maintenance Tools .6-8

Filing & Repair Tools . . . .6

Grinders & Grease Guns .7

Grinding Wheels . . . . . . .8

Chain Identification (ID) .9-11

Drive-link Number ID . . . . .12

Chain Letter ID . . . . . . .13-14

Four Basic Rules . . . . . .15-16

Chain Maintenance . . . . . .17

Chain Tension . . . . . . . .18-21

Chain Lubrication . . . . . . . .21

Sharpening Chain . . . . .22-26

Setting Depth Gauges .26-30
Installing Chain Parts . .30-31

Breaking out Rivets . . . .32-33

Breaking in a Chain . . . . . .34

Filing Specifications . . .35-63
Square Ground Filing . .64-66
Chain Troubleshooting .67-73

GUIDE BARS

How Bar P/N’s Work . . .74-75

Guide-bar Terms . . . . . . . .76

Bar Maintenance Tools . . .76

Intenz®Bars . . . . . . . . . . . .77

Bar Maintenance . . . . . .78-79

Power Match®Noses . . .80-81
Nose Sprockets: Pro-Lite

®

& Micro-Lite®Pro Bars .82-83
Bar Troubleshooting . . .84-87

DRIVE SPROCKETS

Terms and Tools . . . . . . . .88

Rim sprockets with

Wear-depth Indicators . . . .89

Installing Sprockets . . . . . .89

Sprocket

Maintenance . . . . . . . . .90-91

Sprocket

Troubleshooting . . . . . . .92-93

HOW A CUTTER WORKS .94
HOW TO ORDER

REPLACEMENT CHAIN . . .95
CUTTING IN

COLD WEATHER . . . . . . . .96

WARRANTY . . . . . . . . . . .97

ANSI CHAIN
CHART . . .Inside Back Cover

2

Saw Chain

The Four Oregon

®

End-Use Symbols

Each of these four symbols represents a generalized
category of chain saw use. Oregon

®

chains are listed
in this manual under one or more of these symbols,
generally indicating the type of use for which the
product is intended.

PROFESSIONAL CHAINSAW USE

• Big-timber loggers

• Pulpwood loggers

• Forest firefighters

COMMERCIAL CHAINSAW USE

• Arborists • Orchardists

• Utility and construction workers

• Tree Surgeons

• Farmers • Commercial thinners

• Commercial firewood cutters

• Landscapers

CONSUMER CHAINSAW USE

• Homeowners

• Occasional firewood cutters

• Campers

• Hunters

MECHANICAL HARVESTER USE

• For use on mechanical timber-harvest­ing and processing equipment.

• Do not use harvester attachments on

hand-held saws.

Harvester chains are listed in this manual for
reference. For more information on other
harvester products, see the Oregon

®

Harvester

Application Guide or the Oregon

®

Harvester

Handbook.

NOTE

3

Saw Chain

To keep your cutting system of chain, bar, and
sprocket working at peak efficiency - and to minimize
wear - there are a number of things every user should
do periodically. There are specific maintenance tasks
that should be performed and there are more general
“common-sense” things to do, some of which need to
occur with greater frequency, some with lesser frequen­cy. And there are some things you should never do.

To help you know what to do and how often, Oregon

®

uses five symbols that tell the frequency at which each
of the different activities should occur. Here are the five
symbols, what they mean, and an example of a task or
activity that corresponds to each.

EXAMPLES OF SYMBOL USE

Symbol Its Meaning Example task or activity

Before each use Be sure your saw’s oil

▲

reservoir is filled with
clean bar-and-chain oil.

Often (hourly, Check your chain’s tension

■

or at each and adjust it if necessary.
refueling)

Daily Check you drive sprocket

●

for wear and replace it
if necessary.

Weekly Check your bar’s rails to be

◆

(periodically) sure they are square and

free from excessive wear,
repair or replace if needed.

Never Never allow your chain to



contact dirt or rocks during
operation.

These five symbols appear throughout this manual,
and on other Oregon®product packaging. Oregon

®

urges you to become familiar with these symbols, and
to perform the tasks they refer to, so that you can enjoy
maximum performance and maximum life from your
Oregon

®

chain, bar, and sprocket.

The Five Oregon®Symbols

for Periodic Maintenance

4

Saw Chain

OREGON®CHAIN TERMS

CHAIN PITCH

Chain pitch is the distance between any three
consecutive rivets, divided by two.

Oregon

®

chain pitches are:

1/4," .325", 3/8," .404," and 3/4."

CHAIN GAUGE

Chain gauge is the drive link’s thickness where it fits
into the guide-bar groove. The industry standard for
gauges is: .043," .050," .058" and .063." Oregon

®

chain gauges of .063," .080" and .122" are used for
Harvester applications.

THE PARTS OF A CUTTER

CHAIN CUTTER-SEQUENCE TERMS

Standard

Semi-Skip

Skip
(Full Skip)

Cutting Corner

Side Plate

Depth
Gauge

To e

Gullet

Heel

Rivet Hole

Top Plate

Filing Angle
Witness Mark

(Not on all Cutters)

÷ 2

Wide-track depth gauge
with Filing Witness Mark

Vanguard Cutter

CONTINUED…

5

Saw Chain

OREGON®CHAIN TERMS (CONTINUED)

THE PARTS OF A SAW CHAIN

Parts below named in Bold Face indicate kick­back-reducing links and features: bumper tie
straps, bumper drive links, and ramped depth
gauges.

CUTTER MAINTENANCE TERMS

DEPTH-GAUGE TOP-PLATE TOP-PLATE

SETTING FILING ANGLE CUTTING ANGLE

SIDE-PLATE ANGLE FILE-GUIDE ANGLES

10°

90°

Right-hand cutter
w/ standard
depth gauge

Tie strap

Bumper drive link

Left-hand cutter

w/ standard

depth gauge

Drive link

Preset tie strap

Right-hand cutter
w/ ramped depth
gauge

Preset tie stra

p

Drive link

Bumper tie strap

Left-hand cutter w

/

ramped depth

gauge

Bumper tie strap

NOTE

6

Saw Chain

OREGON®CHAIN-MAINTENANCE TOOLS

FILING TOOLS

햲

ASSEMBLED FILE GUIDE

햳

SHARPENING KITS

*Asst’d. P/N’s *Asst’d. P/N’s

햴

ROUND FILE

햵

FLAT FILE

햶

DEPTH-GAUGE

*Asst’d. P/N’s P/N 12211 TOOLS

*Asst’d. P/N’s

햷

BAR-MOUNT FILING GUIDE

햸

FILE HANDLE

P/N 23736A P/N 30870B (100 CT.)

*See pages 35-63 for part numbers, file sizes, and other help
selecting the right tools for your Oregon®chain.

CHAIN-REPAIR TOOLS

햲

CHAIN

햳

RIVET SPINNER

햴

CHAIN BREAKER
BREAKER P/N 24549-s (SAE) ANVIL
P/N 24548A P/N 24549-si (Metric) P/N 111939

OREGON

3/8"

.325

OREGON®CHAIN-MAINTENANCE TOOLS

GRINDERS



SURE SHARP

®



BENCH-MODEL



GRINDING WHEELS
12-VOLT CHAIN GRINDER FOR 511A GRINDER
GRINDER P/N 511A *Asst’d. P/N’s
P/N 28588 See page 8



MINI GRINDER



BAR-MOUNTED



GRINDING WHEELS
P/N 108181 CHAIN GRINDER FOR MINI GRINDER

P/N 109178 (12 V) & BAR-MOUNTED
P/N 109176 (115 V) GRINDERS

*Asst’d. P/N’s

See page 8

7

Saw Chain

GREASE GUNS



GREASE GUN



GREASE GUN



GREASE GUN

P/N’s 110534 40469-A) 21939

8

Saw Chain

511-A GRINDER WHEELS

GRINDING WHEEL GRINDING WHEEL CORRESPONDS

PART NUMBER WIDTH TO FILE SIZE

DIAMETER(S)

OR534-18 1/8" 5/32" or 4.5mm
OR534-316 3/16" 3/16" or 7/32"
OR534-516 5/16" 5/16"

MINI GRINDER AND
BAR-MOUNTED CHAIN GRINDER WHEELS

GRINDING WHEEL GRINDING WHEEL CORRESPONDS

PART NUMBER WIDTH TO FILE SIZE

DIAMETER(S)

OR4125-18 1/8" 5/32" or 4.5mm
OR4125-316 3/16" 3/16" or 7/32"

CHAIN IDENTIFICATION

OREGON®FILING OREGON®CHAIN CUTTER TYPE CUTTER KICKBACK-

CHAIN SPEC’S CHAIN GAUGE SEQUENCE REDUCING

PART TYPE END SIDE FEATURES

NUMBER VIEW VIEW (IF ANY)

*

1/4" – PITCH CHAIN

25AP PAGE MICRO .050" MICRO CHISEL®STANDARD

CHISEL

®

35

.325" – PITCH CHAIN

20BP PAGE MICRO .050" MICRO CHISEL®STANDARD
21BP CHISEL

®

.058"

22BP

36

.

063"

20LP, M20LP PAGE SUPER .050" CHISEL STANDARD
21LP, M21LP 20 .058"
22LP, M22LP

37

.

063"

33LG PAGE SUPER .050" CHISEL STANDARD
34LG GUARD

®

.058"

35LG 38

.

063"

33SL PAGE PRO .050" STANDARD
34SL GUARD

™

.058"

35SL 39

.

063"

95VP PAGE MICRO .050" MICRO CHISEL®STANDARD

LITE

™

40

95R PAGE RIPPING .050" MICRO CHISEL®STANDARD

CHAIN

41

3/8" – PITCH CHAIN (CONTINUED ON NEXT PAGE)

72CJ, CJX, PAGE SUPER .050" CHISEL (CJ, CJX)

CK, CKX, GUARD

®

SKIP

CL, CLX

48 SQUARE (CK, CKX)

75CJ, CJX, GROUND

.

063" SEMI-SKIP
CK, CKX, (CL, CLX)
CL, CLX STANDARD

72AP, DP PAGE S-70 .050" SEMI CHISEL (AP) SKIP
73DP .058" (DP) ST'D.

75DP 43

.

063"

*KICKBACK REDUCING FEATURES

9

Saw Chain



LOW-PROFILE
RAMPED DEPTH
GAUGE



WIDE-TRACK
RAMPED
DEPTH GAUGE



HIGH TOP­PLATE TAIL
LOCATION



BUMPER
DRIVE LINK



BUMPER
TIE STRAP



RAMPED
DEPTH
GAUGE

10

Saw Chain

CHAIN IDENTIFICATION (CONTINUED)

OREGON®FILING OREGON®CHAIN CUTTER TYPE CUTTER KICKBACK-

CHAIN SPEC’S CHAIN GAUGE SEQUENCE REDUCING

PART TYPE FEATURES

NUMBER (IF ANY)

3/8" – PITCH CHAIN (CONTINUED)

72DG,DJ PAGE SPEED .050" SEMI-CHISEL (DG) ST’D.
73DG

44

GUARD™.058" (DJ) SKIP

75DG .063"

72JG,LG PAGE SUPER .050" CHISEL (JG) SKIP
73JG,LG

45

GUARD®.058" (LG) ST’D.

75JG,LG .063"

72JP,LP,M72LP PAGE SUPER 70 .050" CHISEL (JP) SKIP
73JP,LP,M73LP

46

.058" (LP) ST’D.

75LP,M75LP .063"

72RD PAGE RIPPING .050" SEMI-CHISEL STANDARD
73RD

49

CHAIN .058"

75RD .063"

72SG PAGE XTRA .050" SEMI-CHISEL STANDARD
73SG

47

GUARD®.058"

75SG .063"

72V PAGE VAN- .050" CHISEL STANDARD
73V

42

GUARD .058"

75V .063"

90SG PAGE MICRO- .043"

CHAMFER CHISEL

(SG) ST'D.

50

LITE

™

91P PAGE XTRA .050"

CHAMFER CHISEL

STANDARD

51

GUARD

®

91VS, M91VS PAGE LOW .050"

CHAMFER CHISEL

STANDARD

52

VIBRATION

LOW

PROFILE

91VG PAGE LOW .050"

CHAMFER CHISEL

STANDARD

53

VIBRATION

XTRA

GUARD

®

91LX POWER .050" SPECIALIZED STANDARD

SHARP

®

**

END SIDE

VIEW VIEW

**Use 91LX ONLY on saws with automatic chain-sharpening systems. No hand maintenance required.

11

Saw Chain

CHAIN IDENTIFICATION (CONTINUED)

OREGON®FILING OREGON®CHAIN CUTTER TYPE CUTTER KICKBACK-

CHAIN SPEC’S CHAIN GAUGE SEQUENCE REDUCING

PART TYPE FEATURES

NUMBER (IF ANY)

.404" – PITCH CHAIN

16H PAGE HAR- .063" MICRO CHISEL®STANDARD
18H

61

VESTER .080"

26, 26P PAGE MICRO .058" MICRO CHISEL®STANDARD
27, 27A

54

CHISEL®.063" (A) SKIP

27P

27R PAGE RIPPING .063" MICRO CHISEL®(R) ST’D.
27RA

55

CHAIN (RA) SKIP

50AJ,AL PAGE SUPER .050" CHISEL (AJ) SKIP
51AJ,AL

59

CHISEL™.058" (AK) SEMI

52AJ, SQUARE .063" (AL) ST’D.

AK,AL GROUND

50L PAGE SUPER .050" CHISEL STANDARD
51L

56

CHISEL™.058"

52L .063"

58CJ, CL PAGE SUPER .058" CHISEL (JG) SKIP
59CJ, CK,

59

GUARD®.063" (LG) ST’D.

CL SQUARE

GROUND

58CP PAGE MICRO .058" CHIPPER STANDARD
59CP

57

BIT

®

.063"

58J, 58L PAGE SUPER .058" CHISEL (JG) SKIP
58LG

58

GUARD

®

(LG) ST’D.
59J, 59L .063"
59JG, LG

59AA PAGE CHIPPER .063" CHIPPER SKIP

60

CUTTER

3/4" – PITCH CHAINS

11BC PAGE CHIPPER .122" CHIPPER STANDARD

62

11H PAGE SEMI .122" SEMI-CHISEL STANDARD

63

CHISEL

END SIDE

VIEW VIEW

26P, 27P

26, 27, 27A

12

Saw Chain

CHAIN DRIVE-LINK NUMBER IDENTIFICATION

Nearly all Oregon®chains are named by a part
number made up of a number (see below), and
letters (see pages 13-14).

Oregon

®

Part-number Examples: 27A, 72LP, 91VG,

M72LP

First, note the numbers:

27 A, 72 LP, 91 VG, M72 LP

These numbers are stamped on the chain’s drive
links and indicate the physical size of the chain
(pitch and gauge).

CHAIN

PITCH GAUGE

NUMBER

11 3/4" .122"
16 .404" .063"

18 .404" .080"
20 .325" .050"

21 .325" .058"
22 .325" .063"

25 1/4" .050"
27 .404" .063"
33 .325" .050"

34 .325" .058"
35 .325" .063"

50 .404" .050"
51 .404" .058"
52 .404" .063"
58 .404" .058"
59 .404" .063"

72 3/8" .050"
73 3/8" .058"
75 3/8" .063"
90 3/8" Low Profile .043"
91 3/8" Low Profile .050"

95 .325" .050"

÷2

72

13

Saw Chain

CHAIN LETTER IDENTIFICATION

The Letters: 27



A, 72



LP , 91



VG ,



M 72



LP

The letters represent cutter type and sequence, kick­back-reducing features, or other physical traits of the chain.



A

Micro Chisel

®

cutters
with skip sequence
(27A only)



AA

Chipper cutters with
skip sequence (59AA
only)



AJ

Square-ground chisel
cutters with skip
sequence



AK

Square-ground chisel
cutters with semi-skip
sequence



AL

Square-ground chisel
cutters with standard
sequence



AP

25AP: Micro Chisel

®

cutters with bumper
drive links and standard
sequence. 72AP:
Semi-chisel cutters
with skip sequence



BC

Chipper cutters with
standard sequence
(11BC only)



BP

Low-vibration Micro
Chisel

®

cutters with
bumper drive links and
standard sequence



CJ

Square-ground chisel
cutters with ramped
depth gauges and skip
sequence



CJX

Square-ground
DuraPro™ chisel cut­ters with ramped depth
gauges and skip
sequence



CK

Square-ground chisel
cutters with ramped
depth gauges and
semi-skip



CKX

Square-ground
DuraPro™ chisel cut­ters with ramped depth
gauges and semi-skip
sequence



CL

Square-ground chisel
cutters with ramped
depth gauges and
standard sequence



CLX

Square-ground
DuraPro™ chisel cut­ters with ramped depth
gauges and standard
sequence



CP

Chipper cutters with
bumper drive links and
standard sequence



DG

Semi-chisel cutters with
ramped depth gauges
and standard sequence



DJ

Semi-chisel cutters with
ramped depth gauges
and skip sequence
(72DJ only)



DP

Semi-chisel cutters with
bumper drive links and
standard sequence



H

Modified for harvester
applications, Micro
Chisel

®

cutters with

standard sequence

CONTINUED…

14

Saw Chain



JG

Round-ground chisel
cutters with ramped
depth gauges,
bumper tie straps
and skip sequence



JP

Round-ground chisel
cutters with bumper
drive links and skip
sequence



L

Chisel cutters with
standard sequence



LG

Round-ground chisel
cutters with ramped
depth gauges and
standard sequence
(33LG is a low
vibration chain)



LP

Low-vibration, round­ground chisel cutters
with bumper drive links
and standard sequence



LX

Power Sharp

®

chain
with ramped depth
gauges, bumper drive
links and standard
sequence (no hand
maintenance required)



M

Specially built chain
with round-ground
chisel cutters and
bumper drive links
for effective cutting
in extremely dirty or
abrasive conditions



P

Micro Chisel

®

cutters
(26P, 27P), or Chamfer
Chisel cutters (91P),
with bumper drive links
and standard sequence



R

Ripping chain with
Micro Chisel

®

cutters
and standard sequence



RA

Ripping chain with
Micro Chisel

®

cutters
and skip sequence
(27RA only)



RD

Ripping chain with
semi-chisel cutters and
standard sequence
(3/8"-pitch only)



SG

Ramped depth gauges,
bumper tie straps and
standard sequence
(72, 73, 75SG have
semi-chisel cutters.
90SG has low-vibration
chamfer-chisel cutters)



SL

Round-ground chisel
cutters with ramped
depth gauges, bumper
tie straps and standard
sequence (33SL is a
low vibration chain)



V

Low-vibration, round­ground Vanguard chisel
cutters with standard
sequence and wide­track depth gauges



VG

Low-vibration
semi-chisel cutters with
ramped depth gauges,
bumper tie straps and
standard sequence



VP

Low-vibration Micro
Chisel

®

cutters with
ramped depth gauges,
bumper drive links and
narrow-kerf design
(95VP only)



VS

Low-vibration semi­chisel cutters with
ramped depth gauges
and standard sequence
(91VS only)

CHAIN LETTER IDENTIFICATION (CONTINUED)

15

Saw Chain

THE FOUR BASIC SAW-CHAIN RULES

ATTENTION CHAINSAW USERS:

Oregon®urges you to become familiar with the four
basic saw-chain rules. Users who know and follow
these rules can count on superior performance from
their chain, bar, and sprocket – and – reduce safety
hazards at the same time.

RULE NUMBER 1

Y

OUR CHAIN MUST BE CORRECTLY TENSIONED

More chain and bar problems are caused by incorrect
chain tension than by any other single factor. See pages
18-21 on how to tension your chain.

RULE NUMBER 2

YOUR CHAIN MUST BE WELL LUBRICATED

A constant supply of oil to your saw’s bar, chain, and
sprocket is vital. Without it, excessive friction, wear,
and damage will occur. See page 21 for instructions on
how to lubricate your chain.

CONTINUED…

16

Saw Chain

RULE NUMBER 3

Y

OUR CHAIN MUST BE SHARP

When your chain is sharp, it does the work. When it’s
not, you do the work – and your cutting attachments
will wear more rapidly. See pages 22-26 for instructions
on how to sharpen your chain. See pages 35-63 to find
maintenance specifications for each Oregon

®

chain type.

RULE NUMBER 4

YOUR CHAIN’S DEPTH GAUGES MUST BE SET CORRECTLY

Depth-gauge setting and depth-gauge shape are
critical to performance and safety. See pages 26-30 for
instructions on how to set your chain’s depth gauges.

See specific depth gauge maintenance for 72V,
73V and 75V Vanguard chains on pages 29-30.

NOTE

17

Saw Chain

HOW TO MAINTAIN CHAIN

ATTENTION: Oregon® urges dealers, chainsaw users,

and anyone who services saw chain to become familiar
with proper chain-maintenance techniques and the pos­sible dangers which can result if chain is not properly
maintained.

Failure to follow the instructions below can result in
severe injury to the saw operator, bystanders, or the
person performing maintenance.



Always turn off your saw’s engine before handling

the chain, guide bar or sprocket.



Any one of the following conditions can increase

a chain’s potential kickback energy, increase the risk
of a chain throwing itself off the bar, increase the
chance of a chain breaking, or increase the risk of
other hazards associated with chainsaw use.



Loose chain tension



Incorrect sharpening of chain angles



Dull chain



Alteration of kickback-reducing chain features



Excessive chain depth-gauge settings



Incorrect chain depth-gauge shapes



Incorrectly installed chain parts



Loose rivets, or cracks or breaks in any
chain component



When performing maintenance on saw chain,

follow all instructions provided with the chain, or on
the page in this manual pertaining to your chain.
Doing so can minimize the risk of injury.

WARNING

18

Saw Chain

HOW TO TENSION YOUR CHAIN

▲

Tension chain before each use

■

Tension chain often, or at each refueling



Never tension your chain right after cutting.
Chain tensioned while hot can cool and shrink,
causing tension to be too tight. Let chain cool first.



READ THE WARNING ON PAGE 17.

Always wear protective gloves.

1. Turn the engine off.

2. Loosen bar-

mounting nuts

on the side of

your saw.

3. Adjust tension as follows:

If you have a

ssoolliidd--nnoossee bbaarr

, follow 3a (below).

If you have a

sspprroocckkeett--nnoossee bbaarr

, follow 3b (on next
page). If you have an Intenz™ bar with the internal
tensioning feature, follow 3c (page 20).

3a. IF YOU HAVE A SOLID-NOSE BAR

Pull the bar nose up, and keep it up as you adjust
tension.

NOTE

Basic Chain-Tensioning Tasks

▲

Before use

■

Often

●

Daily ◆ Weekly



Never

CONTINUED

19

Saw Chain

HOW TO TENSION YOUR CHAIN

(3a CONTINUED)

Turn your saw’s tension-adjustment screw until the
bottoms of the lowest tie straps and cutters come up
and

just

touch the bottom of the bar rail.

While still holding the nose up, tighten your saw’s rear bar­mounting nut first, then tighten the front mounting nut.

3b. IF YOU HAVE A STANDARD SPROCKET-NOSE BAR

Pull the bar nose up, and keep it up as you adjust tension.

Tension must be tighter on a sprocket-nose bar than
on a solid-nose bar. Turn your saw’s tension-adjustment
screw until the bottoms of the lowest tie straps and
cutters come up and

solidly

contact the bottom of the

bar rail. Then add an additional 1/4 turn of the adjust-

ment screw.

While still holding the nose up, tighten your saw’s rear bar­mounting nut first, then tighten the front mounting nut.

CONTINUED

20

Saw Chain

HOW TO TENSION YOUR CHAIN (CONTINUED)

3c. IF YOU HAVE AN INTENZ

®

SPROCKET-NOSE BAR

Turn the tension-adjust

slot until the bottoms
of the lowest cutters
and tie straps come up
and

solidly

contact the

bottom of the bar rail.

Tighten your saw’s rear
bar-mounting nut first,
then tighten the front
mounting nut. It is not

necessary to hold the
nose up when adjusting
tension on Intenz

®

bars.

When replacing a standard bar with an Intenz

®

bar, the saw's adjustment pin must be removed.
Contact your dealer if you need help.

4. Pull the chain by hand along the top of

the bar several times, from the engine
to the bar’s tip. Chain should feel snug
but still pull freely.

If you have a sprocket-nose bar you should now
perform the snap test. Grasp the chain along the
bottom of the bar, pull down, and let go. Chain
should snap back to its original position, solidly
contacting the bottom of the bar.

NOTE

NOTE

Continued...

21

Saw Chain

5. Check tension often during operation, especially
during the first half-hour. If chain loosens: stop, let
chain cool, and readjust tension.

HOW TO LUBRICATE YOUR CHAIN

▲ Each time you fill your gas tank,

fill your oil reservoir with clean
bar-and-chain oil.

■ Be sure your chain, bar, and sprocket are always
receiving oil from the saw during operation.

 Never put used oil, or old motor oil, in your saw or

on your chain.

▲

Before the first use,
soak the chain overnight
to allow oil to penetrate all
chain components.

Basic Lubrication Tasks

▲

Before use

■

Often

●

Daily ◆ Weekly



Never

22

Saw Chain

HOW TO SHARPEN CHAIN

▲ Sharpen chain before each use.

■ Sharpen chain often, or as needed.



READ THE WARNING ON PAGE 17.

Sharpening your chain while it is on the saw requires
proper chain tension, as shown on pages 18-21 prior
to filing.

Pages 35-63 show the correct maintenance specifi­cations and the correct maintenance-tool part num­bers for each of the Oregon

®

chain types. Find the
page which gives the correct filing specifications for
your Oregon

®

chain. To do so, use the Chain

Identification chart on pages 9-11.

If unsure of your Oregon

®

chain’s type, or part

number, ask your Oregon

®

saw chain dealer, or

call the Oregon

®

technical services department at
503-653-4706 between the hours of 7:30 am and
4:00 pm, Pacific time, Monday through Friday.

BEFORE & AFTER SHARPENING YOUR CHAIN

1. Before sharpening your chain, clean oil and grease
from the chain. This will prevent build-up in your
file’s teeth, or on the wheel when grinding.

2. Before sharpening, inspect, repair, or replace
damaged chain.

3. During your inspection, check for each of the
following:

• Proper installation of tie straps and drive links.

• Cracked or broken cutters, cutter top plates,

or tie straps.

• Bent, cracked or burred drive links.

• Severe abrasive damage.

NOTES

Basic Sharpening Tasks

▲

Before use

■

Often

●

Daily ◆ Weekly



Never

CONTINUED...

23

Saw Chain

• Abnormal chain wear.

• Wear patterns on the chain that may indicate a
worn bar or sprocket.

• Loose rivets (if you can rotate the rivets with your
fingers, they’re too loose).

4. Use the correct sharpening specifications for your
Oregon

®

chain type. See pages 35-63.

• If unsure of your Oregon

®

chain's type, or part

number, ask your Oregon

®

chain dealer.

• For Sharpening Chain with a Grinder see below.

• For Sharpening Chain with a Round File see pages

25-26.

5. After sharpening your chain, check and adjust depth
gauges. See pages 26-30 for instructions.

6. After sharpening and adjusting depth gauges, clean
off any particles of material, then lubricate the chain
thoroughly with bar and chain oil. Soaking the chain
overnight produces the best results.

SHARPENING CHAIN WITH AN
OREGON®GRINDER

Note: Wear safety goggles.

1. Set vise assembly
to the proper

ttoopp
ppllaattee ffiilliinngg aannggllee
(

See pages 35-63
for correct angles
for each Oregon

®

chain type.)

TOP-PLATE FILING ANGLE

24

Saw Chain

2. To set the proper
grinder head angle,
use the recommended
ttoopp--ppllaattee ccuuttttiinngg aannggllee
(

See pages 35-63
for correct angles
for each Oregon

®

chain type.)

3. Dress vitrified grinding wheels often to maintain
correct shape (see illustration). Use either a rotary
wheel dresser or a dressing brick.

Full Radius, for all

FFoorr 1111HH CChhaaiinn OOnnllyy::

round-ground chains 3/16" Partial Radius

except 11H & 1/8” Flat

NOTE:

• To avoid burning cutters, use light intermittent strokes.

• Never grind into other chain components.

• If damage is present on the chrome surface of top

plates or side plates, grind back until such damage is
removed.

• Keep all cutter lengths equal.

25

Saw Chain

SHARPENING WITH A ROUND FILE

1. Be sure 1/5th, or 20%, of the file’s diameter is always

held above the cutter’s top plate. The best way to
do this is with an Oregon

®

File Guide. The file guide
automatically keeps 20% of the file's diameter
above the cutter's top plate..

2. Keep the correct
Top-plate Filing Angle
line on your file guide
parallel with your chain.

3. Sharpen cutters on one side of the chain first. File
from the inside of each cutter to the outside. Then
turn your saw around and repeat the process for
cutters on the other side of the chain.

4. If damage is present on
the chrome surface of top
plates or side plates, file
back until such damage
is removed.

inside

outside

= 1/5th or 20%
above top plate

CONTINUED...

26

Saw Chain

HOW TO SET DEPTH GAUGES

■ Set depth gauges often, every 3 or 4 sharpenings,
or more often if needed.



READ THE WARNING ON PAGE 17.

Setting your depth gauges while the chain is on
the saw requires proper chain tension, as shown on
pages 18-21 prior to filing.

Pages 35-63 show the correct depth-gauge setting
and the part number of the correct depth-gauge tool
for each of the different Oregon

®

chain types. Find
the page which gives the correct filing specifications
for your Oregon

®

chain. To do so, use the Chain

Identification chart on pages 9-11.
If unsure of your Oregon

®

chain’s type, or part

number, ask your Oregon

®

saw chain dealer, or

call the Oregon

®

technical services department at
503-653-4706 between the hours of 7:30 am and
4:00 pm, Pacific time, Monday through Friday.

NOTES

Basic Depth-Gauge Tasks

▲

Before use

■

Often

●

Daily ◆ Weekly



Never

CONTINUED...

5. Keep all cutter lengths equal.

A B

A=B