MMD TWIN SHAFT SIZER 625 Series User manual

Machine Serial Number : S625-0085*
Date Of Manufacture : November 2000
Case Designation : Height: Std Height Low Blind End
Length: Standard Length
Shafts Designation : 4 Tooth x 8 Ring
Gearbox Assembly : MMD R200, 30:1
Fluid Coupling Type : Voith 487 TVG
Wheel Carriage Assembly : Corner Type Units
Centralised Greasing : Customer Supply
Underspeed Sensing : Carlo Gavazzi, 110V A.C
*Please quote in all correspondence. This number can be found on
the identification plate, and welded onto the machine side plate
INSTALLATION, OPERATION, SPARE
PARTS, AND MAINTENANCE MANUAL
MMD Mining Machinery Developments Limited
THE MMD GROUP OF COMPANI ES
MMD 625 SERIES
(625MM CENTRES)
TWIN SHAFT SIZER™
S625-0085, Standard Height & Length, Low Type Blind End Case, 4T x 8R
CUSTOMER
ANGLO COAL
GOEDEHOOP COLLIERY
SOUTH AFRICA
AB

PREPARED BY :- K.HUDDART
POSITION :- CAD DEPARTMENT.
DATE COMPLETED :- 14 - 12 - 00
MMD JOB NUMBER 15464
MACHINE SERIAL NUMBER S625-0085
GEARBOX SERIAL NUMBERS S7070435-019
S7070435-020
G.A. DRAWING NUMBER 6250424
Company Registration Nº. 1382580
CUSTOMER
ANGLO COAL
GOEDEHOOP COLLIERY
SOUTH AFRICA
MMD 625 SERIES, 625MM BREAKER
SHAFT CENTRES TWIN-SHAFT SIZER™
AB

CONTENTS
GENERAL ARRANGEMENT DRAWING Section 1
SIZER™ ASSEMBLY Section 2
OPERATION & MAINTENANCE Section 3
SIZER™ CASE ASSEMBLY Section 4
GEARBOX ASSEMBLY Section 5
MOTOR / FLUID COUPLING ASSEMBLY Section 6
WHEEL CARRIAGE ASSEMBLY Section 7
AUTO LUBRICATION ASSEMBLY Section 8
UNDERSPEED SENSING ASSEMBLY Section 9

INDEX
GENERAL ARRANGEMENT DRAWING SECTION 1
General Arrangement Drawing Page 2
SIZER™ ASSEMBLY SECTION 2
SIZER™ Assembly Page 2 - 3
SIZER™ CASE ASSEMBLY SECTION 4
SIZER™ Case Assembly Page 2 - 5
Side Wearplate Assemblies Page 6 - 9
Left Hand Breaker Shaft Assembly Page 10 - 15
Right Hand Breaker Shaft Assembly Page 16 - 21
Heavy Duty Tooth Cap Assembly Page 22 - 23
Gear Coupling Assembly Page 24 - 25
GEARBOX ASSEMBLY SECTION 5
Gearbox Case Assembly Page 2 - 8
Input Shaft Assembly Page 9 - 10
2nd Reduction Shaft Assembly Page 11
3rd Reduction Shaft Assembly Page 12
4th Reduction Shaft Assembly Page 13
Output Shaft Assembly Page 14
MOTOR / FLUID COUPLING ASSEMBLY SECTION 6
Motor / Fluid Coupling Assembly Page 2 - 3
WHEEL CARRIAGE ASSEMBLY SECTION 7
Wheel Carriage Assembly Page 2 - 3
CENTRALISED GREASING ASSEMBLY SECTION 8
Centralised Greasing Assembly 2
UNDERSPEED PROXIMITY SENSOR SECTION 9
Underspeed Sensing Assembly Page 2 - 3

MMD MINING MACHINERY DEVELOPMENTS LIMITED
General Arrangement Drawing, Page 1of 2Section 1Revision 1
MMD 625 SERIES, 625mm CENTRES
TWIN SHAFT SIZER™
General Arrangement Drawing No. - 6250424
REVISION MODIFICATION DATE
1.0 FIRST ISSUE 14-12-00

MMD MINING MACHINERY DEVELOPMENTS LIMITED
SIZER™ Assembly, Page 1of 3Section 2– Revision 1
SIZER™ ASSEMBLY
SERIAL NUMBER - S625-0085
REVISION MODIFICATION DATE
1.0 FIRST ISSUE 14-12-00

MMD MINING MACHINERY DEVELOPMENTS LIMITED
SIZER™ Assembly, Page 2of 3Section 2– Revision 1
SIZER™ Assembly - Serial Number : S625-0085

MMD MINING MACHINERY DEVELOPMENTS LIMITED
SIZER™ Assembly, Page 3of 3Section 2– Revision 1
SIZER™ Assembly - Serial Number : S625-0085
ITEM PART
NUMBER
DESCRIPTION UNIT
MASS
QTY
1346250424 Standard Length, Low Profile Case Assembly 5,320 1
2146251942 Side Wear Plate Assembly 170.5 2
3146251943 Side Wear Plate Assembly 191 2
4246251956 Left Hand Heavy Duty Shaft Assembly
(4 Tooth x 8 Ring) 2,538 1
5246251957 Right Hand Heavy Duty Shaft Assembly
(4 Tooth x 8 Ring) 2,538 1
6145060084 Heavy Duty Tooth Cap & Fixings Assembly 23.6 64
7111701004 Gear Coupling Assembly 109 2
8247070435 MMD R200 30:1 Ratio Gearbox Assembly 1,758 2
9146251966 Voith 487 TV Fluid Coupling Assembly 581 2
10 145040240 Wheel Carriage Assembly 1,757 1
11 146251983 Centralised Greasing Assembly 22.6 1
12 143210000 Carlo Gavazzi 110 Volt Underspeed Sensing Assembly 0.6 2
13 – Electric Motor (Customer Supply) – 2
The Total Mass Below Excludes Item 13.
TOTAL MASS:- 14,628 kg

MMD MINING MACHINERY DEVELOPMENTS LIMITED
Operation & Maintenance, Page 1of 23Section 3 – Revision 2.3
MMD 625 SERIES TWIN
SHAFT MINERAL SIZER
PRINCIPLES OF OPERATION &
MAINTENANCE SCHEDULE
REVISION MODIFICATION DATE
1.0 FIRST ISSUE 14-12-00

Operation & Maintenance, Page 2of 23Section 3 – Revision 2.3
MMD 625 SERIES TWIN
SHAFT MINERAL SIZER™
Principles Of Operation
The MMD Mineral SIZER™ accepts the product in through the top of the SIZER™, delivery being from any angle. The
two rotating shafts have attached the appropriate sizing teeth which pass the total product, undersize and oversize, down
through the SIZER™.
The undersized product is passed through the rotating teeth without further degradation, whilst the oversized product is
presented to the teeth in such a manner that the weakness of the material in tension is exploited to the advantage. The size
of the broken product can be controlled in all three planes, giving an accurately sized product, which is then passed to the
underside of the SIZER™.
The SIZER™ is made of extremely robust construction and of adequate strength to withstand continuous heavy duty
operation.
The machined sideframes are of ribbed construction fabricated from structural steel with easily replaceable steel
wearplates covering all the inside area of the sizing chamber. Suitable drillings readily accept the fitting of hopper and
chute work.
The main shafts are machined from high strength alloy steel bar which are supported by self aligning double row
spherical roller bearings which are situated in heavy duty housings. The bearings are lubricated by grease at both ends of
the SIZER™ and are protected by heavy duty lip seals which are further protected by a grease filled double labyrinth to
prevent the ingress of water, dirt, etc.
The actual sizing elements are manufactured to MMD’s own specification, various specialist materials have been
developed to suit particular requirements.
Important Note On Operation
Running machines without load for extended periods is known to have serious detrimental effects. This can cause
damage to the bearings. It must therefore be part of the operating procedure that when the machine is not being
fed material for an extended period it must be shut down.

Operation & Maintenance, Page 3of 23Section 3 – Revision 2.3
Safe Operating Procedure
BEFORE ANY WORK IS CARRIED OUT ON THE SIZER™ OR ANY OF ITS ANCILLIARIES, ISO-
LATE THE POWER SUPPLY FOR THE DRIVE ELECTRIC MOTOR. UNLESS THE ABOVE OPER-
ATION IS CARRIED OUT, NO PERSON OR PERSONS SHALL STAND ON THE MACHINE.
mInstallation of safety guards and hand rails shall be the responsibility of the customer at the time of commissioning.
mDuring operation of the machine, no person or persons should violate the safety guards and hand rails in its vicinity.
mUnless otherwise stated, MMD will not be responsible for the safe siting of the machine, and/or any requirements
appertaining to operating codes of practice.
mMMD will not be responsible for the use or operation of the machine for any purpose other that the specified /
accepted operation requirement in the official order.
mIt is understood any maintenance carried out in accordance with this manual shall be by a person or persons
qualified to carry out such practice in compliance with the safety requirements of the operating company.
NOTE: FAILURE TO COMPLY WITH ANY OF THE ABOVE PROCEDURES IS DONE SO AT THE
OPERATOR’S OWN RISK.
Commissioning Procedure
If the SIZER™ is removed from the working position for major overhauls or modifications, it will also be necessary to
re-commission it prior to re-starting.
mCarry out a full check of all items against manual parts list and drawings to ensure that everything is installed cor-
rectly. This is a visual check only.
mCarry out a stall test to adjust the level in the fluid coupling, refer to the SIZER™ Stall Test section.
mFor the recommended lubricant specifications/quantities, see the Maintenance Schedule.
mRun the machine under zero-load conditions for four (4) hours. Check for excessive noise, vibration, and tempera-
ture. The normal operating temperature of the gearbox ranges between 55oC and 80oC. If any adverse effects are
evident, refer to the Trouble Shooting guide. Rectify as necessary.
mRun the machine under full-load conditions for eight (8) hours. Again check for any excessive noise, vibration and
temperature as before.
Pre-Start Check List
mEnsure visually that the machine is fully engaged in the working position.
mCheck thoroughly to ensure that no person or persons can be injured when the machine starts.
mCheck drive components for signs of obvious damage, leaks, etc.
mCheck all oil levels, (gearbox & spur gears if fitted), check that the bearings are charged with grease.
mCheck autolube system is set to run (if fitted).

Operation & Maintenance, Page 4of 23Section 3 – Revision 2.3
SIZER™ Start-Up Procedure
mCarry out the specified pre-start checks.
mThe machine can now start. If the motor starts, but the shafts do not rotate, then the machine is either stalled, or a
fusible plug has melted in one or both of the fluid couplings.
mRefer to the Stall Procedure.
Overload Safety Systems
(Mechanical)
mMechanical overload protection is given by use of a fluid coupling, mounted on the input shaft of the gearbox and
the drive shaft motor.
mThe fluid coupling is protected against excessively high operating temperatures by built-in fusible plugs, which melt
on thermal overloading, and allow the fluid to discharge, thereby interrupting the transmission of torque and prevent-
ing damage.
mAfter a fusible plug failure, the fault must be corrected. The peripheral bolts must be re-torqued, (see fluid couplng
section), new fusible plugs fitted, and the fluid coupling refilled with clean fluid in accordance with the fluid cou-
pling manual.
m160/140/180ºc. For normal use the 160ºc type fusible plug should be used.
Overload Safety Systems
(Electrical)
m Where specified, fitted at the non drive end of the SIZER™, is an underspeed sensing device. The purpose of the under-
speed sensing device is to isolate power to the main SIZER™ motor(s) and upstream supply systems. When the rotors
have lost speed. This is achieved by a pulse stud on the breaker shaft(s) passing through the magnetic field of a close
proximity sensor, therefore inducing an electrical impulse to the monitoring system. Should the breaker shafts stop ro-
tating, the monitoring systems should be connected to ensure they trip the electric motor(s) after seven seconds.
The
Power supply to the electric motor(s) must be isolated
, and a manual inspection can be carried out to identify the fault.
Replacing The Underspeed Sensor
Should the underspeed sensor become inoperative, it will be necessary to replace it. To do this the machine must be isolated
electrically together with any upstream supply systems, so that they cannot be started accidentally whilst work is being carried
out.
i Isolate power supply.
i Disconnect electric leads.
ii Loosen the locknuts, and unscrew the detector head.
iv Refitting is the reverse of the above procedure. However, care must be taken to ensure that the sensor head is
within 5 to 10mm of the stud in the end of the breaker shaft, which provides a pulse every revolution.

Operation & Maintenance, Page 5of 23Section 3 – Revision 2.3
SIZER™ Stall Test
After every operating stall, and after any major overhaul, the fluid coupling must be reset to give optimum performance.
This is achieved by carrying out the following;
m Isolate the machine, by removing the cable from the electric motor. Use lockout procedures.
m Physically block the breaker shafts, so that they cannot rotate.
m Re-connect the power cable to the electric motor.
m The next operation requires and a tachometer, and is carried out as follows.
i Select the start position on the control switch, and run the motor until a steady speed reading is obtained on the
tachometer. It is imperitive that running time is kept to a minimum to avoid a build of thermal energy in the
coupling.
ii Stop the motor.
iii The objective is to obtain a steady reading of approximately 94% of synchronous motor speed.
i.e,
50Hz = 1410 RPM
60Hz= 1700 RPM
iv Add or remove a small amount of fluid as required
v Allow sufficient time for the coupling to cool before repeating the test.
m If the tachometer reading is below the desired speed, release fluid from the fluid coupling. If synchronous speed is
reached add fluid to the coupling. Repeat this process until a steady reading is achieved for the motor of 94% syn-
chronous speed.
m Remove the obstruction from between the SIZER™ shafts.

Operation & Maintenance, Page 6of 23Section 3 – Revision 2.3
Trouble Shooting Guide
It is recommended that a daily check be made for any excessive noise, vibration, lubricant leaks, or obvious damage. The
following hints should help in determining the source of any unusual feature;
NOISE – When an unusual noise is heard, it is important to determine quickly what is causing the noise, so that action
can be taken. There are basically two noises to consider.
iHigh speed end (Electric Motor)
ii Low speed ends (Breaker Shafts)
The first step is to determine the frequency of the noise. It will be a regular noise in either the machine aperture or the
drive train. If it is a slow rhythmic noise, it is likely to come from the shafts. This could indicate that there is a broken or
loose bolt. Fully check the machine, the machine aperture, (with no material passing through), to determine the cause.
If the noise is high frequency, it is possibly coming from the drive train. Starting from the motor, work along the transmis-
sion to determine the cause of the noise. The obvious causes would be; faulty bearings in the motor, fluid coupling, or
gearbox; lack of lubricant or ingress of dust into rotating parts.
VIBRATION – A similar check list is used as when tracking down an unusual noise, however, most excessive vibration
is caused either by faulty main shaft bearings or faulty gearbox bearings. These items should be checked first by checking
the temperature on the frame of the machine adjacent to the shaft bearings and on the casing of the gearbox.
LUBRICANT LEAKS – It is essential that all lubricants are corrected and replenished in accordance with the service
manual recommendations. If any leak is found, action must be taken immediately to correct it, i.e find the source of the
leak, determine the cause of the leak by reference to the spare parts manual, and identify the parts required to rectify the
leak. When this has been done, the machine must be stopped at the first opportunity so that the work carried out.
OBVIOUS DAMAGE – 99% of the obvious damage occurring on MMD machines inside the machine aperture is
caused by tramp iron. Broken or cracked caps/segments and bolts are the most common form of obvious damage. A vis-
ual inspection will determine the cause.

Operation & Maintenance, Page 7of 23Section 3 – Revision 2.3
Wear Plates - Replacing
The MMD SIZER™ has wear plates on the inside of the machine aperture to protect the side plates and bearing housings.
These wear plates must be replaced when excessive wear has been detected. Clearance of rotating teeth on the side wear plates
should be a minimum of 10mm. This clearance should be checked when side wear plates have been replaced before starting
the machine.
To remove wearplates, the following procedures must be followed;
Side Wear Plates:
m Where the machine has pyramids/side combs which are bolted through the side wear plate, it will be necessary to re-
move them prior to attempting to remove the wear plate.
m Weld two temporary lifting lugs to each wear plate, (on smaller machines this procedure may not be necessary).
m Remove the bolts retaining the side wear plates and pyramids to the side plates, and discard them.
m Attach lifting equipment to the lifting lugs.
m Remove the bolts retaining the side wear plates and discard them.
m Remove the wear plate.
m Thoroughly clean the inside of the machine where the new wear plate is to be fitted to ensure correct seating of the new
wear plate.
m Weld temporary lifting lugs to the new side wear plate.
m Lift the new wear plate into position, and line up with fixing holes.
m Bolt the new wear plate into position, using new bolts. MMD do not recommend the re-use of wearplate bolts due to
the wearing of the bolt tops.
m Tighten the bolts to the torque specified on MMD procedure T056.
m Remove the temporary lifting lugs and discard them.
m Check the clearance between tooth caps/segments and wear plates. Clearance should be a minimum of 10mm.

Operation & Maintenance, Page 8of 23Section 3 – Revision 2.3
End Wear Plates:
m Thoroughly clean the top of the machine to expose the holes for the lifting eye bolts.
m Remove the fixings from the end wear plates, which attach the wear plate to the bearing housing. These fixings are
fitted into drilled and tapped holes.
m Fit lifting eye bolts into the top of the wear plates, and lift out.
m Thoroughly clean all faces to which the new wear plates fit, to ensure correct seating of the new wear plate. Protect
tapped fixing holes before cleaning.
m Attach lifting eye bolts to the new wear plate, and lift it into position.
m Bolt the wear plate into position using the existing set screws.
m Remove the lifting eyes.
m Tighten the bolts to the torque rating specified in MMD procedure T056. (Included at the back of this manual).

Operation & Maintenance, Page 9of 23Section 3 – Revision 2.3
Main Shaft Bearings
(Flange Type)
To replace a worn or damaged bearing, the following procedure must be followed:
m Follow the procedure for removing the shafts, see shaft removal.
m Using a bearing puller or similar device, plus a hydraulic jack, the complete bearing assembly must be pulled from the
end of the shaft, after first removing the end cap.
m This will leave the old labyrinth still attached to the shaft. It must be checked visually for excess wear. See Things To
Check
.
m The damaged bearing assembly may now be dismantled as follows:
i Remove the retaining plate, complete with the two outer seals.
ii Remove the damaged bearing from the capsule.
Things to Check
m LABYRINTH - Check for wear grooves on the seal surface. Also, check for any significant wear on the labyrinth shoulders.
If there is any grooving on the seal surface, then the labyrinth must be replaced.
m SEALS - Check the condition of all lip seals. If there is any sign of damage, the seals must be replaced. As company policy
MMD recommend that all seals be replaced if they are removed for any reason.
m SEAL SPACER - If there is any grooving on the outside diameter of this spacer, it must be replaced.
m BEARING CAPSULE - If there is any obvious damage or any sign that the bearing has been turning in the capsule, then it
should be replaced.
Main Shaft Bearings
Re-Assembly (Flange Type)
Should every item need replacing, the following procedure should be followed;
m Remove old labyrinth from the breaker shaft using oxy-acetylene cutting equipment to heat the labyrinth to assist re-
moval. Care must be taken to ensure that no damage is done to the shaft.
m Assemble the parts in the following order:-
i Labyrinth
ii Capsule
iii Seals
iv Bearing
v Seal Plate
vi Spacer
vii ‘O’ Rings
m Warm the labyrinth in an oil bath or similar to 110oC. Remove from the oil bath and push onto the shaft immediately.
The labyrinth will stop at the raised shoulder.
m Fit the inner seals into the bearing capsule. Ensure the seals are seated correctly, (see the drawing in the appropriate
section).
m Coat the inside of the capsule sparingly with a light oil.

Operation & Maintenance, Page 10 of 23Section 3 – Revision 2.3
m Warm the bearing and capsule in an oil bath or similar to 110oC. Remove from the oil bath and immediately push
onto the shaft. Care must be taken as the seals engage the labyrinth spacer and the assembly must be ‘eased’ into
position. The assembly will seat fully home once engaged onto the seal surface of the labyrinth spacer as the furthest
extremity of the labyrinth locates against the inner race of the bearing.
m Warm the spacer in an oil bath and heat to 110oC. When up to temperature remove and immediately push onto the
shaft.
m Re-assemble the machine in reverse sequence.
Main Shaft Bearings
(Dowel Located Type)
To replace a worn or damaged bearing, the following procedure should be followed;
m Follow the procedure for removing the shafts until the shafts are fully exposed, see shaft removal.
m Using a bearing puller or similar, plus a hydraulic jack, the complete bearing assembly must be pulled from the end
of the shaft, after first removing the end plate.
m This will leave the old labyrinth still attached to the shaft. It must be checked visually for excess wear.
m The damaged bearing assembly may now be dismantled as follows:
i Remove the retaining plate. This automatically removes the two outer seals, and the seal spacer.
ii Support the bearing capsule around the periphery, 200mm off floor level.
iii Apply heat to the outside of the bearing capsule.
iv The damaged bearing should fall out of the capsule.
Things to Check
m LABYRINTH - Check for wear grooves on the seal surface. Also, check for any significant wear on the labyrinth shoulders.
If there is any wear on the seal surface, then the labyrinth must be replaced.
m SEALS - Check the condition of all lip seals. If there is any sign of damage, the seals must be replaced. As company policy
MMD recommend that all seals be replaced if they are removed for any reason.
m SEAL SPACER - If there is any wear grooves on the outside diameter of this spacer, it must be replaced.
m BEARING CAPSULE - If there is any obvious damage or any sign that the bearing has been turning in the capsule, then it
should be replaced.
m Dowel - Check for any signs of damage on the sides of the dowel. If the capsule has been trying to turn, there will be inden-
tations approximately half way up its length. If theseare evident, then the dowel must be replaced.
m Assemble all the parts required in the following order:-
i Labyrinth
ii Capsule
iii Seals
iv Bearing
v Dowel & Seal
vi Seal Retaining Plate
vii Spacer
Main Shaft Bearings

Operation & Maintenance, Page 11 of 23Section 3 – Revision 2.3
Re-Assembly (Dowel Located Type)
Should every item need replacing, the following procedure should be followed;
m Remove the old labyrinth from the breaker shaft using oxy-acetylene equipment to apply heat to the labyrinth to
assist removal. Care must be taken to ensure that no damage is done to the shaft.
m Warm the labyrinth in an oil bath to 110
o
C. Remove from the oil bath and push onto the shaft immediately. Place up
to the abutment.
m Fit the inner seals into the bearing capsule. Ensure they are seated correctly, (see the drawing in the appropriate sec-
tion).
m Coat the inside of the capsule sparingly with a light oil.
m Fit the bearing into the capsule. This is a toleranced fit and a soft drift should be used.
m Warm the bearing and capsule in an oil bath or similar to 110
o
C. Remove from the oil bath and immediately push onto
the shaft. Care must be taken as the seals engage the labyrinth spacer and the assembly must be ‘eased’ into position.
The assembly will seat fully home once engaged onto the seal surface of the labyrinth spacer as the furthest extremity
of the labyrinth locates against the inner race of the bearing.
m Fit one of the bonded seals into the dowel location hole on the capsule and hold in with thick grease, ensuring the re-
maining bonded seal is in the dowel location hole on the bottom bearing housing. Then place the dowel to the bottom
bearing housing.
m Warm the spacer in an oil bath and heat to 110
o
C. When up to temperature remove and immediately push onto the
shaft.
m Fit the two outer seals into the seal retaining plate ensuring that the seals are seated correctly as shown in the appro-
priate section.
m Push the seal retaining plate into the capsule. Fit the retaining bolts and torque to the required amount as specified as
T056.
m Re-assemble the machine in reverse sequence.

Operation & Maintenance, Page 12 of 23Section 3 – Revision 2.3
Breaker Shafts
m Move the SIZER™ into the maintenance position, if fitted onto wheels.
m Thoroughly clean the SIZER™ of all extraneous material, grease, oil, etc.
m Remove the end wearplates, and side combs (where fitted) from the machine. (See Heading ‘Wear Plates -
Replacing’).
m 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.
m 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.
m 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.
m Where the bearings are flange mounted, remove the bolts securing the bearing capsule to the bearing housing.
m Remove the bolts from the top bearing housing on each end of the machine.
m Using two appropriately sized eye bolts, lift out the top bearing housings. The shaft assemblies are now exposed.
m The damaged shaft can now be lifted out by means of nylon webs slung at either end.
m Once the shaft is removed, the bearing assemblies, and labyrinth seals, can be removed, (refer to the bearing removal
sections).
m 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:
m Isolate the machine electrically by removing the cable from the SIZER™ drive electric motor.
m Undo the bolts securing the top cover plate to the side plates, end cover and the top bearing housing.
m If desired drain the gear oil.
m Remove the top cover plate. (There is no need to drain the oil).
m Remove the end cap from the driven (non-drive) shaft by unscrewing the fixings which secure it.
m 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.
m Rotate the driven shaft to the desired position.
m Move the spur gear back along the splines, and into position, so that it meshes with the other spur gear.
m Replace the shaft end cap, and replace the fixings, using a threadlock.
m Refit the top cover plate after applying sealant and refit the bolts which secure it.