Oregon 890F4 FLUSH User manual

© 2022 OREGON®, Oregon Tool Inc. Specifications are subject to change without notice. REV09062022 F/N 566594
OPERATOR’S MANUAL
890F4 FLUSH
Flush Cut Hydraulic Saw

© 2022 OREGON®, Oregon Tool Inc. Specifications are subject to change without notice. REV09062022 F/N 566594
890F4 FLUSH OPERATOR’S MANUAL
3
TABLE OF CONTENTS
SYMBOLS & LABELS 4
SAFETY 5
TECHNICAL SPECIFICATIONS 7
SETUP 8
OPERATION 11
MAINTENANCE 14
TROUBLESHOOTING 15
REFERENCE 16
DECLARATION OF CONFORMITY 18
INTRODUCTION
This manual outlines the maintenance and operation of OREGON® manufactured products.
This is a professional tool and is solely intended for use by trained and experienced operators.
The 890 FLUSH chainshaw is designed to cut concrete, stone and masonry when used with the appropriate
OREGON Diamond Chain. Ductile iron pipe may be cut ONLY if using PowerGrit® Utility Saw Chain.
To get the maximum benefit from your saw, and ensure maximum safety, be sure to read this manual
thoroughly and periodically review safety instructions.
TABLE OF CONTENTS

© 2022 OREGON®, Oregon Tool Inc. Specifications are subject to change without notice. REV09062022 F/N 566594
890F4 FLUSH OPERATOR’S MANUAL
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SYMBOLS & LABELS
THE FOLLOWING SYMBOLS & LABELS MAY BE FOUND IN THIS MANUAL OR ON THE SAW
Read the operator’s manual carefully and understand the
contents before you use this equipment.
Always use:
• Protective helmet
• Ear protection
• Protective glasses or full face protection
Wear hand protection
THE FOLLOWING SYMBOLS AND DEFINITIONS ARE FOUND THROUGHOUT THIS MANUAL AND
ARE DESIGNED TO MAKE YOU AWARE OF POTENTIAL HAZARDS OR UNSAFE PRACTICES.
A potentially hazardous situation exists which, if not avoided, could result
in death or serious injury.
A potentially hazardous situation exists which, if not avoided, may result
in minor or moderate injury or property damage.
A potential situation exists which, if not avoided, may result in product or
property damage.
IMPORTANT
WARNING
CAUTION
� WARNING
• Do not exceed 8gpm (30 lpm) hydraulic flow or 2500 psi (172.5 bar)
hydraulic pressure.
• Do NOT insert tool into slot narrower than chain.
• Do NOT run the saw backwards. The chain should travel away from
the operator on the top of the bar and return on the bottom of the
bar.
• Do NOT operate tool without solid footing and firm hand grip.
• Failure to observe these precautions can result in serious injury
• Fluids escaping under pressure can penetrate the skin.
� WARNING
• Do NOT operate saw without side cover.
• Do NOT operate saw without baffle drain.
• Do NOT use this saw cover on any other saw model.
• Failure to observe these precautions can result in serious injury.

© 2022 OREGON®, Oregon Tool Inc. Specifications are subject to change without notice. REV09062022 F/N 566594
890F4 FLUSH OPERATOR’S MANUAL
5
SAFETY
WARNING
THE FOLLOWING SYMBOL APPLIES TO ALL THE ITEMS LISTED ON THIS PAGE
A potentially hazardous situation exists which, if not avoided, could result in
death or serious injury.
Diamond chain breakage can result in high-speed ejection of parts, which can result in death or serious
personal injury to operators or bystanders. The items listed below are critical to minimizing the risk of
diamond chain breakage and injury.
• DO NOT operate a diamond chain saw with a damaged, modified, broken or missing side cover,
bottom guard or guard flap. The side cover, bottom guard and guard flap provide protection against
contact with moving parts, ejected debris, broken diamond chain, thrown water and concrete slurry.
• DO NOT operate saw with loose, missing, damaged or improperly repaired parts.
• DO NOT exceed the hydraulic flow for your saw model: 8 gpm (30 lpm) or 12 gpm (45 lpm) at 2,500
psi (172.5 bar) hydraulic pressure.
• DO NOT run the saw backwards. The chain should travel away from the operator on the top of the bar
and return on the bottom of the bar.
• DO NOT insert the saw into a slot narrower than the chain segments. Rapid pushback might occur.
Reference: Most diamond segments are .225 (5.72 mm) wide.
• DO NOT use the 890 FLUSH side cover as a replacement cover for another saw.
• DO NOT use damaged, modified or improperly repaired chain.
• DO NOT run the saw upside-down. Concrete debris can fly back into the operator’s face.
• DO NOT use your hands to search for hydraulic leaks. Hydraulic fluid escaping under pressure can
penetrate skin. If any hydraulic fluid is injected into skin seek medical attention immediately.
• NEVER cut ductile iron pipe with the saw (except when using PowerGrit®Utility Saw Chain). Segment
loss or diamond chain breakage may occur.
• See page 13 for information about cutting with PowerGrit chain.

© 2022 OREGON®, Oregon Tool Inc. Specifications are subject to change without notice. REV09062022 F/N 566594
890F4 FLUSH OPERATOR’S MANUAL
6
SAFETY
CAUTION
THE FOLLOWING SYMBOL APPLIES TO ALL ITEMS LISTED ON THIS PAGE
A potentially hazardous situation exists which, if not avoided, may result
in minor or moderate injury or property damage.
• Always turn the saw OFF when performing maintenance on the saw, including chain tensioning.
• Never use equipment that is not functioning properly.
• Have the saw repaired by qualified service personnel.
• Insufficient water supply may result in excessive wear to the Diamond Chain, which can lead to loss
of strength and Diamond Chain breakage. Minimum water pressure is 20 psi (1.5 bar).
• SealPro®diamond chains require a minimum water pressure of 20 psi (1.5 bar). Insufficient water
supply may result in excessive wear to the chain, which can lead to loss of strength and chain
breakage, and/or damage to the guidebar nose sprocket.
• Never start the saw unless the guidebar, Diamond Chain and
side cover are properly installed.
GENERAL SAFETY PRECAUTIONS
• Always wear protective clothing, including hard hat, eye protection, hearing protection, and gloves.
• Avoid loose fitting clothing.
• Perform safety checks before starting each day.
• Always operate tool with solid footing and with both hands on chain saw.
• Remove or control slurry to prevent slippery conditions while cutting.
• Be sure there are no obstructions (plumbing, electrical conduit, air ducts, etc.) and no unnecessary people
present.
• Set up a well-marked safety zone with a roped boundary and clear signs.
• Provide adequate ventilation when working in an enclosed area.
• To avoid electrocution, check for live electrical wiring near cutting area.

© 2022 OREGON®, Oregon Tool Inc. Specifications are subject to change without notice. REV09062022 F/N 566594
890F4 FLUSH OPERATOR’S MANUAL
7
TECHNICAL SPECIFICATIONS
890 Series 8 gpm (30 lpm) 890 Series 12 gpm (45 lpm)
Weight w/out bar and
chain (1' hose whips) 23.5 lbs (10.6 kg)
Length 23 inches (58.5 cm)
Height 10.5 inches (26.5 cm)
Width 9.5 inches (24 cm)
Hydraulic Supply 8 gpm (30 lpm) @
2,500 psi (172.5 bar)
12 gpm (45 lpm) @
2,500 psi (172.5 bar)
Hydraulic Fluid
Requirements (Type) PC HYDREX MV32 or equivalent
Water Pressure Minimum: 20 psi (1.4 bar)
Water Flow 2 gpm (8 lpm) minimum
Operating Speed 6,100 rpm (avg. free running)
5,500 sfm (avg. free running chain)
6,500 rpm (avg. free running)
5,800 sfm (avg. free running chain)
Torque(1) 7.0 ft-lbs (9.6 Nm) 10.0 ft-lbs (13.5 Nm)
Horsepower (1) 6 hp (4.5 kW) 8 hp (6.0 kW)
Guaranteed Sound Power
Level Lwa (2) 107 dB(A) (K=0.2 dB(A))
Equivalent Sound Pressure at
the Operator's Ear LpA (2) 98 dB(A) (K=0.7 dB(A))
Vibration ahv, eq Concrete
Cutting (3)
2.0 m/s2(K=0.1 m/s2) Front Handle
6.0 m/s2(K=1.4 m/s2) Rear Handle
Vibration ahv, eq PowerGrit
Cutting (3)
4.6 m/s2(K=0.1 m/s2) Front Handle
4.8 m/s2(K=0.3 m/s2) Rear Handle
(1)Measured using 18HP hydraulic power pack (8 gpm/30 lpm and 23HP hydraulic power pack (12 gpm/45 lpm) at
2000psi/138 bar.
(2) Measured in accordance with ISO3744:2010
(3) Measured in accordance with ISO5349-1:2001

© 2022 OREGON®, Oregon Tool Inc. Specifications are subject to change without notice. REV09062022 F/N 566594
890F4 FLUSH OPERATOR’S MANUAL
8
SETUP
STEP 1
Loosen the three side cover bolts and
two bar retainer plate bolts using the 13
mm end of scrench. Remove side cover
and bar retainer plate.
GUIDE BAR AND DIAMOND CHAIN INSTALLATION
STEP 2
Turn the chain-tensioning screw CCW
until the adjustment pin is back towards
the drive sprocket.
STEP 3
Place the bar retainer plate through the
bar into holes on sub-plate.
STEP 6
Thread two M8 hex bolts into bar
retainer plate from the motor side of the
mainframe. Finger tighten only.
STEP 4
Mount the chain on the bar starting at the
drive sprocket & continue over the bar
nose.
STEP 5
Make sure all of the drive links are inside
the bar groove, then
pre-tension the chain.

© 2022 OREGON®, Oregon Tool Inc. Specifications are subject to change without notice. REV09062022 F/N 566594
890F4 FLUSH OPERATOR’S MANUAL
9
SETUP
GUIDE BAR AND DIAMOND CHAIN INSTALLATION
STEP 7
Tension the chain. Do not over tension
the diamond chain. Loss of power will
result.
CORRECT CHAIN TENSION
All chains have a tendency to stretch
when used. Diamond chains stretch
more than wood cutting chains
because of the abrasive materials they
are cutting.
If the chain is too tight, a lot of the
saw's power goes into turning the chain
rather than into the cut. In extreme
over-tightened cases, the saw may
not be able to turn the chain at all. In
addition, damage can occur to the bar
nose and premature stretch may occur.
CORRECT CHAIN TENSION
CHAIN TOO LOOSE
If the chain is too loose, it could come
off the bar, or it will allow the drive
sprocket to spin without turning the
chain, which can chew up drive links.
When a chain stretches to a point
where the drive links are hanging
approximately 1/2 in (12 mm) to 3/4
in (18 mm) below the bar, it is time to
tension the chain.
CHAIN TOO TIGHT CHAIN TOO LOOSE

© 2022 OREGON®, Oregon Tool Inc. Specifications are subject to change without notice. REV09062022 F/N 566594
890F4 FLUSH OPERATOR’S MANUAL
10
STEP 9
Install the side cover. Firmly tighten the
three side cover bolts using the 13 mm end
of scrench.
STEP 8
Lift up on the nose of the bar and firmly
tighten the bar retainer bolts. To prevent
chain tensioner breakage, be sure the side
cover nuts are tightened to approximately
20 ft-lbs (27 Nm).
Note: Routinely check inside of the cover for excessive wear. Replace if necessary.
SETUP