Crain 820 / 820V Heavy

INSTRUCTION
MANUAL
FOR
WALLS/JAMBS
TOE.SPACES
INSIDECORNER
HANGINGDOORS
€
No.82A1820V
HEAVY.DUTY
UNDERCUT
SAW
MAR
OPERATING INSTRUCTIONS
The Heavy-DutyUndercutSaw is designedfor undercutting
wooden door jambs, moldings,base,as well as masonry
and stone,to ailownew floor dovering5to be fit underneath'.
Do not usethissaw for sandingfloors,cuttingmetal,or any
other purposenot describedin this instructionmanual.
SAFEW FIRST! For safe operation,please take time to
carefullyreadallthe instructionsand rules in this booklet.
SAFETY GLASSES: Always wear safety glasses when
usinga power tool. Also use face or dust mask if cutting
operationis dusty.
EAR PROTECTION:Wearear plugswhen usingthis saw.
BLADE GUARD: The blade guard attachedto your saw is
for your safetyand protection. lf it becomesdamaged,do
not operateyoursaw untilit hasbeenrepaired.Alwaysleave
bladeguardin operatingpositionwhen usingthe saw.
DOUBLE-INSULATED:This tool is constructedwith two
separatelayersof electricalinsulation.Atool builtwith this
insulationsystemdoes not needto be grounded.
DANGEROUSENVIRONMENTS:Keepwork areaclean;
clutterinvitesaccidents. Do not use power tool on damp
or wet floor.Be surethat thereis good lighting.
ACCIDENTALSTARTING:To avoidaccidentalstarting,do
not carrytool with fingerson switch.
CORD ABUSE: Never carrytools by the cord or yank the
cord to disconnectfrom an outlet. Keep cords away from
heat,oil, and sharpedges.
EXTENSIONCORD:To minimizepower loss and prevent
overheating,use maximumof 25 feet long and 16 AWG.
KEEP BLADESCLEANAND SHARP: Usinga dullblade
will placea heavyloadon your saw and increasethe danger
of kickback. For replacement,use only Crain#821 CarbideTippedBlade,#805 MasonryBladeor#822 DiamondBlade.
WORKINGTERMINOLOGY Fisure1
Pleasereferto the diaorambelow for the terms used in
this instructionmanual
HEIGHT
ADJUSTER
WINGNUT
DEPTHGAUGE
ADJUSTMENT
SCALE
Figure 1
THREE-ARM
KNOB
BLADE REMOVAL:seeFisure2
r Turnoff and unplugsaw.
Retract the height adjuster so it is flush with
the base to allow clearance for wrench.
r Push the lock button
down with one hand
and insert the spanner wrench into the
clamp nut with other
han d ;th e n t ur n unt ilt he
spindleengageswith the
lock button (bladestops
rotating).
Figure 2
r Hold onto the plastic housing;then push hard on the
spannerwrenchcounter-clockwise
to open. lf the bladeis
very hard to remove,use a vise grip to hold the blade.
BLADE INSTALLATION:seeFisure3
r Unplugthe saw.
r Alignthe bladedriver's
slotto the powerunit's
spindlecutout.
r Insert new #821 Carbide-Tipped Blade,
#805MasonryBladeor
#822 Diamond Blade
onto the the spindle.
r Hand tighten the
clampnut and be sure
the blade is centered
and fully seated.
r Always re-tightenthe
clamp nut firmly with
t he sp a n ner wr enc h
before use.
r Re-adjustand check
for proper height
adjustment before
furtheruse.
3i,'#,fH
@{tr
No.805 MASONRYOF No.821 CARBIDE
No.822 DIAMONDBLADE
CLAMPNUT ________@
---ry
''ANNERWREN
"
Figure 3
HEIGHTADJUSTMENT seeFisure4
r Unplugthe saw.
r Loosenthe nuts on heightadjusterabout 11/zIo2 turns
(do not back off the wing nuts more than necessary).
r Adjustthe heightof your bladeby movingthe heightadjuster
up or down untildesiredheightof cut is achieved.Theinside
of the heightadjusterhas 10 referencelines,in increments
of slsz"(.093"),whichisthethicknessof the blade.
r Use these lines as
a guide for adjustment. The housing
must be set parallel
to the floor. This is
critical for safety and
st ra i g h tu nder c ut t ing.
T h e ma xi m um height
adj u stmentis 1" .
r S e c u r e l yt i g h t e n t h e
nuts before use.
HEIGHTADJUSTER , BOTT9M EDGE
Figure 4
DEPTHADJUSTMENT
r Depth adjuster accurately
controlsdepth of cut for either straight-on(figure5) or
a 45"angle(figure6).
r To adjust, loosen the threearm knobon the depthgauge
and movethe depth gaugein
and out as required.
Figure 5
r A depth gauge adjustment
scaleis providedjust behind
the knob with twelvel/a" increments(figure7).
r R e - t i g h t e nt h e t h r e e - a r m
knob firmly beforeuse.
r We recommendthat you set
the depth of cut to no more
lha n 1 /2 "t o m inim iz e t h e
chanceof hittingwall studs,
nails,etc.
Figure 6
A
t
IiBff-^^"
r R emo ve the dept h gaug e
when cuttinginsidecorners.
hil,'
(l
h"
USINGTHESAW:
r Make sure the blade clamp
nut and handle screws are
tightenedsecurely.
LINE IS 1,/..
Figure 7
r Alwayskeepthe handlein the
vertical position for general
undercutting.
r Turn the handle away from
the toe kick for undercutting
toe spaces(seefigure8).
r Plug-in the saw and grasp
handle firmly. Depress the
safety lock button, then pull
the power switch.
Figure 8
r To starta cut, usethe wallto pushthe bladequardback
and exposeblade. DO NOI USEYOUR HAND!
r Plungeto appropriatedepth. Always move the saw
from left to right only.
r Do not force the saw; let the blade cut at highestRPM
possible.
r The saw stops automaticallywhen the switch is released.
INSIDECORNERCUTTING:
r Cut towards corner at 45" angle until the depth gauge
meetsthe right wall (seefigure9).
r Stop and unplugsaw. Removedepth gauge and continuethe cut (seefigure10).
I Whenthe saw housingmeetsboth walls,push saw into
the corneras shown(seefigure11).
WARNING:Depthgaugecoversthe bladeand makesthe
saw saferto use. Alwaysunplugsaw and re-installdepth
gaugewhen you are done with insidecornercutting.
Figure 9
Figure 10
Figure 11
DOOR CUTTING: seeFisure12
r Open the door to the maximum,away from the casements. Workfrom the insideof the door outward,away
from the hinges. To avoid splinteringveneerdoors, it
may be advisableto score the veneer surface at the
desired height of the cut, prior to using the saw. An
applicationof wide maskingtape in the cutting zone
also helps reducesplintering,and will protectthe saw
housingfrom scratchingthe veneer.
r NOTE: The maximumthicknessof cut is 15/8",which
is adequatefor most doors. Checkfor adequatedepth
of cut beforestarting. Thickerdoors may requirecuts
from both sides of the door. Take care not to leave a
thin remnantof door on the opposite side, which can
easilybreakoff and crack the
veneer.Also, check that the
floor is at the sameelevation
on both sidesof the door,or
additional.
heightadjustment
may be required.
r T h e m a x i u m u mh e i g h t o f
cut is one inch. To cut off
higherthan one inch, place
a flat sheet of plywood underneaththe saw.
Figure 12
POCKETDObRCUTTING:
r Takeprecautionsnecessaryfor veneerdoors and check
door thicknessas describedabove (under"Door Cutting"). Pocket door cutting requirestwo people. One
must hold the saw down and in a fixed postition,while
the other personslowly pullsthe door into the blade.
r Removeany unfinishedareaat the bottom of the pocket
door with a hand saw,followingalong in the pre-establishedcut.
Figure13
MASONRYSTONE,ORT|LEUNDERCUTTTNG
r
The No. 805 MasonryBladeis primarilyusedfor cutting
brick. lt is not for usbon tileoi stone.'Usethe No. 822
DiamondBladefor cutting brick,tile or stone.
r
Masonrystone,andtile undercuttingcreatesa lot of dust.
We stronglyrecommendthe operatorwear a dust mask
and place a light cloth over the air intakeon the motor.
Thiswill prolongthe lifeof the saw
r
DONOTusethissawforcuttingsteeloraluminum.Sparks
can causefire in the wall behindthe door casing.
Figure 14
MAINTENANGE:
r lf saw is dropped,the bladeguard may be bent, restricting its full return.Sawdustthat accumulatesbehindthe
bladeguardwillcauseit to becomeclogged.Checkoperationof the blade quard beforeeach use. Do not use
saw if the bladeguart.does not operateproperly.When
not in use,store saw in the custom carryingcase.
REPLACEMENTPARTSAND
ORDERINGINFORMATION
+ Y S .
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%y1810-i
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Order No.
1820-4
1820-AV
1820-8
1820-C
1820-D
1820-E
1820-F
1820-G
1820-H
1820-l
1820-J
1820-K
1820-L
1820-M
1820-0
1820-R
1820-R1
1820-5
1820-T
1820-U
1820-V
1820-W
1555-G
1555-l
1555-0
1810-J
Description
PowerUnit,120volts
Power Unit, 220 volts
PlasticHandle
HandleFastenerSet (4)
HeightAdjuster
Housing
DepthGauge
Guide Washer& FastenerSet (10)
HousingFastenerSet(4)
BladeGuard
BladeGuardSnap Ring
BladeDriver
SpannerWrench
CarryingCase (not shown)
Power Cord (not shown)
Switch TypeA (not shown)
Switch Type B (not shown)
Brush Set ONLY(not shown)
CarryingCase Latch Set (2) (not shown)
CarryingCase Handle(not shown)
Brush HolderAssemblyw/Brushes(not shown)
Switch ConversionKit (not shown)
ThreeArm Knob
Clamp Nut
SetScrew
BladeGuardSpring
SPECIFICATIONS:
POWER
UNIT
ModelNo,820
Voltage:
120VAC,60
HZ,
Construction:
Double
lnsulated
Plug
Type:
3-Prong
Plug
Amperes:
8.15
Amps
Wattage:
930Watts
NoLoad
Speed:
8,000
RMP
MaxDepth
ofCut:
1%'
Max.
Height
ofCut:
1u
ToeSpace
Cutting
Specifications:
Minimum
Height:
31lzu
Muimum
Depth:
31lzu
Weight
14LBS.
Gross
Replacement
Blades:
#821
Carbid+Tippd
Bhde
#805
Masonry
Blade
#822
Diamond
Blade
Model
No.820V
22OVAC,sOHZ
Double
lnsulate
UKPlug
4,1Amps
930Watts
8,000
RMP
1%'
1u
31lzu
31lzu
14LBS.
(same
for820V)
for820V)
$ame
(same
for820$
WARNING:
Some dust createdby power sanding,sawing,grinding,
drilling,and other con'siructionactiviii6scontiihl chemicals known to the State of Californinato cause cancer,
birth defects or other reproductiveharm. Some examples
of these chemicalsare:
o leadfrom lead-basedpaints,
o crystallinesilicafrom brick, cementand other
masonryproduct,?nd .
o arsenicand chromiumfrom chemically-treated
lumber.
Your risk from these exoosuresvaries.dependinoon how
often you do this type of work. To reduceyour ex-posureto
thesechemicals:work in a well-ventilatedarea,and work with
approvedsafety equipment,such as those dust masks that
are speciallydesignedto filterout microscopicparticles.
GUARANTEE
This CrainNo. 820/820VHeavyDuty UndercutSaw
is guaranteedto be free of defects in workmanship
and qualityof materialsfor a periodof one year.
Any parts of this saw found defectivesubject to the
guaranteewill be replacedat no charge.Credit in
full or part cannot be extendedby the distributor,
nor will a new saw be given as a replacementor
loaner.
Sawssubjectto this warrantymust be accompanied
by same,returnedfreightPREPAIDto Milpitas,CA,
and must be in assembledcondition.
DATEOF MFG.
CRAIN CUTTER GO.,rNC.
Milpitas,CA 95035 TEL:(408)e46-6100
w w w
c r a r n t o o l s
Printedby: HW
c o m
FORM F1820-Rev.04/04