Blade Changing - Sealey SM5.V3 Instructions Manual

7. blade cHanging

waRning! befORe maKing any adJustments, discOnnect saw fROm pOweR supply.
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7.1. All adjustments that relate to the smooth and safe running of the blade have been set at the factory. However, if you require to replace
a blade due to it being worn out or if you need to change to a blade with a different tooth size it will be necessary to readjust the
saw.
7.2. changing and tensioning the blade
waRning! take care when handling saw blades, blade teeth are very sharp.
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7.2.1. Raise the sawing arm to the vertical position and engage the support plate see fig.20.
7.2.2. Open the blade back safety panel by removing the screw (58) and hinge it open as shown in fig.21.
7.2.3. Before the blade can be removed release the tension on the blade by turning the blade tension knob (79), see fig.21, anticlockwise.
7.2.4. Remove the lower blade guard (69) and loosen the lowest screw on the upper blade guide and slide the guide away from the blade to
the end of its slotted mounting hole, see fig.17 and fig.22.
7.2.5. ease the blade away from the lowest pulley wheel first and support it as you remove it from the upper pulley wheel then carefully
remove the blade from between the guides.
7.2.6. Place the new blade through the guides first and then ease it around the lower pulley wheel. (ensure that the tooth direction is
consistent with the blade travelling left to right in the cutting area.) retain the blade on the lower pulley with one hand and take up the
tension at the top of the blade with the other hand. then use both hands to ease the blade over the upper pulley.
7.2.7. Begin to tension the blade by turning the knob (79), see fig.21, clockwise but as you do so make sure that the back edge of the blade
is seated against the rim of both pulleys. check that the blade is seating properly by turning the upper pulley by hand (using the
three spokes of the wheel) until you have observed a full rotation of the blade.
7.2.8. once the blade is properly aligned increase the tension until the blade flexes by approx.1mm when pressed at the midway point
between the two pulleys.
7.2.9. Replace the lower blade guard (69), see fig.21, and move the upper blade guide back into its position over the blade.
7.2.10. close the blade protection safety cover and secure it with the plastic headed thumb screw.
7.2.11. reconnect the saw to the power source and run it for two to three minutes to seat the blade.
7.2.12. disconnect the saw from the mains. open the blade back safety cover and recheck the tension and adjust if required. close safety
cover.
fig.21
7.3. blade tracking adjustment
7.3.1. Adjustment of the blade tracking is necessary to prevent the blade from twisting or coming off the blade wheels. this adjustment
should also be made whenever a new blade is fitted (see section 7.2).
7.3.2. run saw for a short time and then switch off.
7.3.3. raise saw arm, open blade safety panel and check blade-to-wheel relationship. rear edge of blade should be very close to, but
not hard against, the wheel flanges.
7.3.4. if inspection indicates that adjustment is required reduce blade tension (see para. 7.2.3.) and loosen the blade tracking lock nut as
seen in fig.22.
7.3.5. Place a 4mm hex tool into the adjuster and rotate in or out as required whilst rotating the upper pulley by hand (using the three
spokes of the wheel) until tracking appears corrected. re-tighten the blade tracking lock nut.
7.3.6. Having made a small adjustment, tension blade, replace blade cover, lower arm and run saw for a short time.
7.3.7. switch saw off, remove blade cover and check tracking. repeat adjustment procedure if necessary.
7.4. blade guide bearing adjustment
7.4.1. correct guide bearing adjustment is important so that the blade runs smoothly and evenly without twisting or snagging anywhere
along its path. each of the outer guide bearings is mounted on an adjustable eccentric bushing.
7.4.2. disconnect the machine from the power supply.
7.4.3. loosen the lock nut while holding the bearing bolt with an open ended spanner, see fig.23.
7.4.4. turn the bolt to adjust the bearing. the bearing should barely touch the blade (0.001"). This clearance can be measured with a piece
of thin paper which should just fit into the gap between the bearings and the blade. tighten the lock nut when satisfied with the
bearing adjustment.
© Jack sealey limited
fig.22
Original Language Version
sM5.V3 Issue:7(H, F)13/02/18