BM&M Super Screen Instruction Manual

Super Screen
(Large)
INSTALLATION & MAINTENANCE
MANUAL
BM&M Screening Solutions
5465 Production Blvd.
Surrey, BC
Canada V3S 8P6
Toll-free: 1-800-663-0323
Phone: [phone]
Fax: [phone]
[email protected]
www.bmandm.com
Customer: Presidium Equipment Ltd.
Location: London, ON
PO#: n/a
Screen Size: 5' x 10' 2-Deck Super Screen
Job #: 7351
Date: July 2015
Your Rep. is: Ninon Richard, Gaston Richard Inc.
Parts & Service: Tel. [phone]

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INDEX
Section 1 INSTALLATION Page
Support Stand Assembly 3
Clearance 7
Equal Hanger Loading 8
Start-Up 9
Start-Up Check List 11
Section 2 MAINTENANCE
Drive Unit 12
Drive Belt 12
Hangers 12
Screen Removal 16
Screen Replacement 17
Section 3 SERVICE
Drive Unit Replacement 22
Hanger Bearing Replacement 26
Drive Belt Replacement 26
Section 4 SPARE PARTS
Parts List 29
Tools List 30
Section 5 TROUBLESHOOTING
Mechanical 31
Performance 32
Section 6 WARRANTY
Warranty 33
Warranty Claims Procedure 34

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Section 1 INSTALLATION
To ensure the BM&M Screen is installed properly the following steps must be
followed.
READ ALL INSTRUCTIONS BEFORE PROCEEDING
BM&M Screens are supplied with a tubular support stand. It is essential that the
supports be properly engineered. See the certified setting plan drawing for the
design criteria.
SUPPORT STAND ASSEMBLY (if the screen has been shipped “broken down”)
1. The stand consists of 2 cross members and 2 side frames. See the
exploded drawing on page 4.
2. Place the 2 lower cross members in position and place the screen body on
top of them.
3. Bring the side frames into position and bolt them to the cross members.
4. The stand must now be leveled and firmly bolted down.
5. Bolt all four hangers into position and secure their upper ends as shown
on the drawing on page 5.
6. Bolt on the hanger brackets if required.
7. Raise the screen into position and attach the lower ends of the hangers to
the hanger brackets on the screen body as shown on the drawing on
page 6. Ensure the safety bolts are secured.
8. All brackets and stand connection bolts must be tightened to the following
lubricated torques.
5/8” NC: 110 ft-lbs
3/4” NC: 200 ft-lbs
At this time torque the Top Yoke bolts on the hangers to 480 ft-lbs., lubricated.
Torque the Bottom Yoke bolts to 250 ft-lbs. After the equal hanger loading
procedure is completed (page 8) the Bottom Yoke bolts should be torqued to 480
ft-lbs., lubricated.

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BM&M HANGER
LOCK NUT
NUT
WASHER
SUPPORT
MEMBER
HANGER BRACKET
SAFETY BOLT
WASHER
LOCK NUT
NUT

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PARALLEL FLOW SCREEN DECK CONFIGURATION
INFEED
SUPPORT STAND
DUST COVER
SCREENS / BALL BOXES
SCREEN
BODY
HANGER
UPPER SCREEN
REMOVAL
MEASUREMENT X
COUNTERFLOW SCREEN DECK CONFIGURATION
INFEED
UPPER SCREEN
REMOVAL
DUST COVER
SCREENS / BALL BOXES
LOWER
SCREEN
REMOVAL
MEASUREMENT X

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Bolt on any discharge chutes that may have been shipped loose. Bolt on the
motor, motor base, drive belt and drive guard if these items have been shipped
loose. When installing the belt on the drive pulley ensure that if does not come off
the driven pulley. Ensure the belt is properly aligned and that the axis of the
motor remains vertical.
BELT TENSION
Proper belt tension is vital. V-belt drives must be taut at start-up and must be
checked again after the first hour of operation. Use standard tensioning
procedures for V-belts.
After the belt has been properly tensioned, it is imperative that all the motor bolts
be torqued to the maximum. This includes the pivot bolts and tension rods.
Failure to do proper torquing may result in serious damage.
Ensure that the entire drive guard assembly is bolted firmly in place.
Run a flexible rubber-sheathed power cable to the motor that allows for the
motion of the screen. A draped loop about 2 feet in length is adequate. Since the
motor shakes with the screen, ensure that all connections in the conduit box are
solid and secure to prevent movement. Motor direction is not critical although
material “drift” can be altered by changing rotation.
A time-delay device must be incorporated in the start/stop circuitry. A delay of
approximately 2 minutes in duration will allow the machine to come to a complete
rest before restarting. It is imperative that the screen be started only if it is
completely montionless.
CLEARANCE
The screen requires room to freely swing in its orbit. Although the size of this
orbit is only 1 1/4” in diameter this motion is exaggerated at start-up and shut-
down. It is therefore essential that 4” of horizontal clearance be provided all
around the screen from all points on the screen. In its stationary position nothing
should be closer than 4” in a horizontal direction. Failure to provide proper
clearance will result in damage to the screen.

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EQUAL HANGER LOADING
Equal hanger loading is critical for smooth running, long machine life and minimal
vibration of the support structure. Improperly loaded hangers can throw the
machine out of balance and may cause severe damage to the hangers or
supporting structure.
The following procedure will ensure equal loading:
1. Ensure the machine is bolted down.
2. Completely loosen the nut at the lower end of one hanger until that
hanger does not support any weight of the screen.
3. Draw a plan view of the screen and mark down measurement “X”
between the end of the hanger and the hanger support bracket as
shown on the illustration on page 6. Use the provided shim stock to
measure this gap. Tighten the hanger bolt to 250 ft-lbs.
4. Do the same for the other three hangers one at a time, marking down
each gap measurement “X” on your drawing. Note that the
measurements across the diagonals should be very similar.
5. Subtract the smallest measurement from the largest measurement. If
this difference is less than 0.025” the machine is balanced. If not, the
machine must be shimmed.
Shimming:
To find the correct shim size to use, take the difference obtained in Step 5
and divide it by 2. Place this size of shim (nearest sized shim or
combination of shims to get the nearest size) in the gap of the hanger with
the largest measurement and tighten the hanger nut back up. Run the
machine for 3 to 4 minutes and then shut the machine off, allowing it to
come to rest.
Repeat Steps 1 to 4 using a new plan view diagram. However, when
recording the gap measurement for the shimmed hanger, leave the shim
in the gap and record the distance between the end of the hanger and the
top of the shim. Always use shim stock to measure the gaps.
Note: Only one corner should require shimming.
If the gap above the shim has become larger than the previously
un-shimmed gap, remove shim and repeat all steps.
If the machine is still not balanced, contact BM&M for assistance.

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Note: After the equal hanger loading procedure is completed satisfactorily, the
Bottom Yoke bolts must be torqued to 480 ft-lbs., lubricated.
START-UP
Grease U-joints before start-up. Before starting the machine be sure that nothing
is fouling the screen and that all guards are in place. A new machine will have
high initial internal friction and high current draws during initial start-up. This can
also happen in cold weather. The high current state will rapidly drop as the
moving parts loosen up.
SHUT DOWN IMPORTANT
Once the power is shut off, it is absolutely essential that the machine be allowed
to come to a complete stop before restarting. To prevent accidental restarting, it
is advisable that a time-delay of 2 minutes be implemented in the starter circuitry
to prevent this from happening. Under no circumstances should the machine be
jogged on and off and it should never be reversed.
NOTE: The speed of the screen is set by the factory. The speed should
never be altered without explicit approval of BM&M.
SAFETY STRAPS
The BM&M Screen is suspended by four hanger assemblies. Should one of
these hanger assemblies wear out or fail due to lack of lubrication, the screen will
not fall since the remaining three hangers will continue to support the screen.
Failed hangers should be repaired or replaced immediately.
If this is not done and the screen continues to operate on three hangers then there is an
increased risk that one of the remaining three hangers will fail, which will allow the
screen to fall from its operating position. This would result in damage to both the screen
and the surrounding structure and any personnel located beneath the screen would be
at great risk. Hanger failures of this type are extremely rare and proper maintenance
procedures will virtually eliminate the possibility.
To eliminate the risk of human injury and machinery damage, safety straps should be
installed on all four corners of the screen, especially in areas where personnel work
beneath the screen or where a single hanger failure would not be detected.
These straps should be adequately sized and should be installed so as to not allow the
screen to drop more than 2 inches. Connections should be tight to prevent chafing, and
should be made to the four hanger brackets on the screen. See the drawing on page 10.

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SECURE STRAP TIGHTLY
TO PREVENT CHAFING
NYLON STRAP
OVERHEAD
STEEL
HANGER ROD
HANGER BRACKET
SAFETY STRAP
LUG (LOCATE TO
SUIT LENGTH)
SHACKLE

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BM&M START-UP CHECK LIST
1. Is there 4” of horizontal clearance all around the screen?
2. Have the hangers been checked for equal loading?
3. Have the U-joints been greased?
4. Are the hanger safety bolts secured?
5. Is the motor voltage correct?
6. Is the motor speed correct?
7. Does the power supply cable have enough freedom of movement?
8. Is the belt alignment okay and tension correct?
9. Is the drive guard in place?
10. Have all bolts been torqued correctly?
11. Are all protecting handrails in place?
12. Have all tools, scaffolding and lifting tackle been removed?
13. Is the time-delay restart circuitry in place or is the operator aware of the restarting
procedure?

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Section 2 MAINTENANCE
The BM&M screen requires very little maintenance due to a minimum of moving
parts and robust construction.
DRIVE UNIT
The drive unit is a heavy duty double-row tapered roller unit encased in a solid
steel housing. It utilizes spring-loaded radial lip seals and comes prepacked with
grease. It requires no additional field lubrication or servicing.
DRIVE BELT
The drive belt consists of a single-reduction drive belt; a multi-section “B” size V-
belt. V-belts should be periodically checked for tension and alignment.
HANGERS
The needle-bearing universal joints will give trouble-free service providing they
receive periodic greasing with good quality wheel-bearing type grease every 400
hours of operation or every two weeks.
GENERAL MAINTENANCE
Periodically check all bolts for proper tightness. Check all bolts after initial 30
minutes of running and then once every three months of service thereafter. Refer
to the appropriate section for the torque settings.
It is essential that all bolts that secure the drive unit assembly are held to
the correct torque settings.
SCREENS
BM&M Super Screens are typically equipped with ball decks which utilize
captive, synthetic-rubber balls to help keep the screens clean. The screen mesh
(or perforated plate) rests on the top surface of the ball box frame. These frames
are made of steel but may also be made of aluminum or hardwood, depending
on the application.

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The screen mesh may be fastened to the ball box frame depending on the
specific installation conditions. Screens have reinforced hooks on the two
longitudinal edges and are utilized to tension the screens. Full-length skirts
engage into the reinforced hooks and generate the tension via a series of
threaded rods and hex nuts through the side wall of the screen body.
See pages 14 and 15.

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ONE DECK ASSEMBLY
FLOW
CLEANING BALLS
(IF SO EQUIPPED)
BALL DECK FRAME OR
SCREEN MOUNTING FRAME
SCREEN
SKIRT
DUST COVER
HOOKED EDGE
BALL DECK FRAME
TENSION
ADJUSTING NUT
SET SCREW

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TWO DECK ASSEMBLY
THREE DECK ASSEMBLY
SCREEN
SKIRT
DUST COVER
HOOKED EDGE
TENSION
ADJUSTING
NUTS
SET SCREW
BALL DECK
FRAME
BALL DECK
FRAME
SET SCREW
TENSION
ADJUSTING
NUTS
HOOKED EDGE
DUST COVER
SKIRT
SCREEN

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SCREEN REMOVAL
In most cases the screens and ball decks can be removed in one of three ways,
as shown on page 19.
1. Through the access door; located at the infeed end of the machine.
2. Through the discharge end, as the discharge chute assembly is bolted on
but is equipped with hinges that allow it to be swung open. Connection
sleeves may need to be removed.
3. Through the top. This entails removal of the dust cover, any inlet
connection sleeves and any dust evacuation sleeves.
The best removal method for a particular installation will depend on a number of
factors such as:
1. Access space around the machine.
2. The number of sections that make up each screen and ball deck.
3. The type of screen element.
One-Piece Screens
If there is ample room to remove a one-piece screen at the infeed end or
discharge end of the machine, then it is best to remove the screen through
whichever end is more convenient. To do this:
1. Loosen the door clamps and swing open the access door, or open the
discharge chute.
2. Loosen the tension skirts, raise them and lock them in the ‘up’ position
using the supplied screen removal tool (P/N SR-2), as shown on page 21.
3. If the ball decks are to be removed then loosen the set screws located on
both sides and ends of the machine.
4. Pull out only the screen element or pull out the screen element and ball
deck at the same time. The ball deck can be left in place if desired.
Screens in Sections
If the screens are in sections, due to the size of the machine or due to limited
room at one or both ends of the machine, the best way to remove the screens is
to:
1. Loosen the door clamps and swing open the door, or open the discharge
chute.

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2. Loosen the tension skirts, raise the skirts and lock them in the “up”
position.
3. Loosen the set screws located at both sides and ends of the machine.
4. Pull out the screen elements and ball deck together. The ball deck
sections are bolted together as shown on page 20. If there is insufficient
clearance behind the machine, they will have to be unbolted as each
section is pulled clear of the machine. Note that finer mesh screens will
have overlapping seal plates at the joints between each section and they
will have to be removed first before each screen element is removed.
Screens removed out of the Top of the Machine
If there is insufficient room to remove the screens at either end of the machine,
then the screens and ball decks must be removed through the top. To do this:
1. Remove any inlet connection sleeves.
2. Remove the dust cover.
3. Loosen and remove all the screen tension skirts.
4. Remove the screen element.
5. Loosen the set screws at both sides and ends of the machine and remove
the ball deck.
6. Repeat the above for any additional screen decks below.
For very fine, delicate screen elements it is recommended that the ball decks be
removed as well as the screen elements, so that the screens can be placed on
top of the ball decks for reinsertion into the machine. This will minimize the
potential for damaging the screen element.
SCREEN REPLACEMENT
One-Piece Screens
If one-piece screens have been removed from either end of the machine then the
screens can simply be slid back into position. Make sure that the tension skirts
are in the ‘up’ position using the supplied tool.
Make sure that the leading edge of the screen is not damaged as it is pushed
into position. This can easily be avoided if a pair of screen-length plastic pipes
about 1” (25mm) in diameter are first laid down on top of the ball deck. The

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screen element is then placed on top of the pipes and pushed into position. Once
the screen is in position the pipes can be removed.
Lower the tension skirts in position and snug them up so that the screen remains
centered on the ball decks. Once all of the slack has been taken up, the tension
skirts should be tightened in sequence to ensure a uniform, taut screen. The
tension skirts should not be over-tightened or the screen will be damaged.
If the ball decks have been removed simply push them back into the machine
before installing the screen. Use the set screws to loosely center the ball decks.
Once all the set screws are snug, give them one extra turn and lock them in
position with the lock nuts. Excessive tightening of the set screws can damage
the ball decks.
Screens in Sections
If the screen is in sections it is best to lay each screen section loosely on top of
its appropriate ball deck and push both together into the machine. Make sure that
the tension skirts are locked in the ‘up’ position using the supplied tool.
Each ball deck should be bolted to the next adjacent ball deck and any
overlapping seal plates attached at the same time. When all of the screens and
ball decks are in position use the set screws that secure the ball decks to loosely
center the ball decks across the width. When all of the set screws are snug, give
them one extra turn and lock them in position and snug them up so that the
screen remains centered on the ball decks.
When all of the slack has been taken up, the tension skirts should be tightened in
sequence to ensure a uniform, taut screen. The tension skirts should not be over-
tightened or the screen will be damaged.
Screens removed out of the Top of the Machine
If the screens have been removed out of the top then reassembly is the reverse
of the removal procedure. Follow the above procedures for installing the ball
decks and tensioning the screens.

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