Craftsman 28933 Operation Manual - Page 122

Spring& Screw

Get Craftsman 28933 - Reciprocating Saw Blade Set PDF manuals and user guides View all Craftsman 28933 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 122 highlights

BLADES Be sureto shutthe engineoff, removeignitionkey,disconnectthe sparkplug wire(s) to preventunintendedstartingbeforeremovingthe cuttingblade(s)for sharpeningor replacement.Protectyourhands b_ usng heavyg oves or a rag to graspthecutt ng bade. The bladesmay be removedas follows: 1. Removethe deck from beneaththe tractor,(referto CuttingDeck Removal)then gentlyflip the deckoverto exposeits underside. . It is importantthat each cuttingbladeedge be groundequallyto maintainproperblade balance. 7. A poorlybalancedbladewill causeexcessivevibrationand may causedamageto the tractorand resultin personalinjury.The blade can be testedby balancingit on a round shaftscrewdriver. Grind metalfrom the heavyside untilit balancesevenly. iMPORTANTW: hen replacingthe blades,makecertain the sideof the blade marked"Bottom" facesthegroundwhenthe moweris turnedto the operatingposition. NOTE:Placea blockof woodbetweenthedeck housingand the cuttingedgeof the bladeto help in breakingloosethehex nut securing the blade. 2. Use a 15/16"wrenchto loosenthehex flangenutsecuringthe bladeto the bottomof the spindleassembly.Securethe spindle by eitherholdingthe bladetightly,or by usinga secondwrenchto hold the nutat the top of the spindle. 3. Continueholdingthe blade ontothe star hub of the spindle,and removethe flangenut and cuttingblade. 4. Repeatthepreviousstepsto removethe otherblade. 5. Toproperlysharpenthe cuttingblades,removeequal amounts of metalfrom bothends of the bladesalong thecuttingedges, parallelto the trailingedge,at a 250to 300angle. iMPORTANT:ifthecuttingedge of the blade hasalreadybeen sharpenedto within 1-5/8"width from theoppositeedge,or if any metal separationis present,replacethe bladeswith newones.See Figure20. f iMPORTANT:Notethat the starsof the blades(and spindles)are not symmetrical.The bladecan be installedon each spindlein onlyone direction.Carefullyalign the star holeof theblade with the star of the spindleshaftwheninstallingeachblade.DO NOTimproperlyalignthe blade and spindleshaft,and attemptto seat the bladeontothe spindle by tighteningthe hexflange nut. 8. Rotatethe bladeas necessaryto align its star hole with the star of the spindleshaft,then slidethe blade ontothe spindleshaft. Threadthe hexflangeontothe spindleshaft and usea torque wrenchto tightenthe hex flangenutto 70 to 90 foot-pounds. 9. Repeatthe aboveprocedureto installthe other blade. Checking Blade Timing Duringnormaloperationthe timingof the cuttingbladescan be altered by abnormalloadson one, or both, cuttingblades.Regularlycheckthe timing arrowson the spindleassembliesto makecertain they are 900 from eachother. If the timingarrowsare not 900from eachother,proceedas follows: 1. Removethe deck fromthe tractor.Removethe idler bracket _aration backstop.Referto Figure21. f ) lind Wing SharpenEdge Evenly 1-5/8inch Figure 20 Bracket Backstop Idler Bracket& Idler Pulley Spring& Screw Figure21 26

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
BLADES
Be sureto shutthe engineoff, remove
ignition
key,disconnectthe
sparkplugwire(s)to preventunintendedstartingbeforeremovingthe
cuttingblade(s)forsharpeningor replacement.Protectyourhands
b_ usng heavyg oves or a rag to graspthecutt ng bade.
The bladesmayberemovedas follows:
1.
Removethe deckfrombeneaththe tractor,(referto CuttingDeck
Removal)then gentlyflip the deckoverto exposeitsunderside.
NOTE:Placea blockof woodbetweenthedeck housingand the
cuttingedgeof the bladeto help in breakingloosethehex nut securing
the blade.
2.
Use a 15/16"wrenchto loosenthehex flangenutsecuringthe
bladeto the bottomof the spindleassembly.Securethe spindle
by eitherholdingthe bladetightly,or by usinga secondwrenchto
hold the nutat the top of the spindle.
3.
Continueholdingthe bladeontothe starhubof the spindle,and
removethe flangenut and cuttingblade.
4.
Repeatthepreviousstepsto removethe otherblade.
5.
Toproperlysharpenthe cuttingblades,removeequalamounts
ofmetalfrombothendsofthebladesalongthecuttingedges,
parallelto the trailingedge,at a 250to 300angle.
iMPORTANT:if
thecuttingedgeofthebladehasalreadybeen
sharpenedto within 1-5/8"width from theoppositeedge,or if any
metalseparation
is present,replacethe bladeswith newones.See
Figure20.
f
_aration
)
lind
Wing
SharpenEdge
Evenly
1-5/8inch
Figure 20
.
7.
It is importantthat each cuttingbladeedge be groundequallyto
maintainproperbladebalance.
A poorlybalancedbladewillcauseexcessivevibrationand may
causedamageto the tractorand resultin personalinjury.The
blade can be testedby balancingit on a round shaftscrewdriver.
Grind metalfrom the heavyside untilit balancesevenly.
iMPORTANT:
When replacingthe blades,makecertainthe sideof the
blademarked"Bottom"facesthegroundwhenthemoweristurnedto
the operatingposition.
iMPORTANT:
Notethat the starsof the blades(and spindles)are not
symmetrical.The bladecan beinstalledoneach spindlein onlyone
direction.Carefullyalign the star holeof theblade with the star of the
spindleshaftwheninstallingeachblade.DONOTimproperlyalignthe
blade and spindleshaft,and attemptto seat the bladeontothe spindle
by tighteningthe hexflange nut.
8.
Rotatethe bladeas necessaryto alignits starholewiththe star
of the spindleshaft,then slidethe blade ontothe spindleshaft.
Threadthe hexflangeontothe spindleshaft and usea torque
wrenchto tightenthe hex flangenutto 70 to 90 foot-pounds.
9.
Repeatthe aboveprocedureto installthe other blade.
Checking
Blade
Timing
Duringnormaloperationthe timingof the cuttingbladescan bealtered
byabnormalloadsonone,orboth,cuttingblades.Regularlycheckthe
timingarrowsonthespindleassembliestomakecertaintheyare900
fromeachother.
Ifthetimingarrowsarenot900fromeachother,proceedasfollows:
1.
Removethe deckfromthe tractor.Removethe idlerbracket
backstop.Referto Figure21.
f
Bracket
IdlerBracket&
Spring& Screw
Backstop
Idler Pulley
Figure21
26