Operation & Maintenance, Page
12
of
23
Section
3
– Revision 2.3
Breaker Shafts
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Move the SIZER™ into the maintenance position, if fitted onto wheels.
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Thoroughly clean the SIZER™ of all extraneous material, grease, oil, etc.
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Remove the end wearplates, and side combs (where fitted) from the machine. (See Heading ‘Wear Plates -
Replacing’).
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Remove the top cover plate from the machine. This is bolted to the machine side plates, the top bearing housing and
the gearbox mounting plate.
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Remove the clamping rings from the gear couplings and slide back the sleeve towards the gearbox. This action
disconnects the drive train from the breaker shafts. Care should be taken so as not to damage any ‘O’ Ring seals.
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Remove the shaft end cap, along with its fixings, and slide the remaining coupling hub off the shaft. Where fitted, the
spur gear can now be slid along the shaft, until it no longer meshes with the spur gear on the driven shaft, taking care
to support its mass at all times.
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Where the bearings are flange mounted, remove the bolts securing the bearing capsule to the bearing housing.
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Remove the bolts from the top bearing housing on each end of the machine.
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Using two appropriately sized eye bolts, lift out the top bearing housings. The shaft assemblies are now exposed.
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The damaged shaft can now be lifted out by means of nylon webs slung at either end.
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Once the shaft is removed, the bearing assemblies, and labyrinth seals, can be removed, (refer to the bearing removal
sections).
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Replacement is a reversal of the above procedure.
Shaft Re-Timing Procedure
Where the machine is fitted with spur gears, the timing of the shafts can be altered as follows;
Spur Gears At Non-Drive End:
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Isolate the machine electrically by removing the cable from the SIZER™ drive electric motor.
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Undo the bolts securing the top cover plate to the side plates, end cover and the top bearing housing.
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If desired drain the gear oil.
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Remove the top cover plate. (There is no need to drain the oil).
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Remove the end cap from the driven (non-drive) shaft by unscrewing the fixings which secure it.
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Slide the spur gear along the breaker shaft splines until it is clear of the spur gear on the drive shaft (until it no longer
meshes), taking care to support its mass.
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Rotate the driven shaft to the desired position.
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Move the spur gear back along the splines, and into position, so that it meshes with the other spur gear.
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Replace the shaft end cap, and replace the fixings, using a threadlock.
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Refit the top cover plate after applying sealant and refit the bolts which secure it.
