P-1346-1

BULLETIN BC-104MA

Installation Instructions

Type BC-Series “MA” Backstop

800-216-3515 • 630-455-1752

www.marlandclutch.com

P-1346-1

2 Marland Clutch • 630-455-1752 Bulletin BC-104MA

Failure to follow these instructions may result in product damage,equipment damage, and serious or fatalinjury to personnel.

Installation, Lubrication, andMaintenance

General

Marland automatic backstops are precision builtsafety devices designed to protect inclinedconveyors or vertical elevators from the dangersof gravity accelerated reversed runaway. To beassured of reliable protection and the longestpossible service life, it is important that thefollowing recommendations be observed for theinstallation, lubrication, and maintenance ofMarland backstops.

As soon as the unit has been received, examineit carefully for damage in transit and report anybreakage discovered to the transit company atonce.

All tags and bulletins attached to the unit shouldbe carefully read before placing the unit inoperation and then filed for future reference.

All units are shipped without oil.

Care must be taken not to place the unit inoperation until it has been filled with oil ofproper specification to the static oil level.

The various component parts referred to in thisbulletin may be readily identified on Illustration 3and Parts List.

If the backstop is to be stored for an extendedperiod of time (over 3 months) before installa-tion, see step 2 for instructions.

Long Term Storage

Backstop units should be completely filled withoil. Store inside, if possible, in a clean dry area.

Once every two months the cam should berotated by hand to lubricate the rotatingelements.

Exposed, unpainted surfaces should be “BrushPainted” with a rust preventative.

Before placing the backstop in operation, com-pletely drain and refill with the proper quantity ofoil and install per the following procedure.

Installation

A. Check for proper free shaft rotationThe backstop is symmetrical which allows itto be mounted for the desired direction offree shaft rotation.

The arrow inscribed on each cam faceindicates the direction of free shaft rotation.Before mounting the backstop on the shaft,be sure to check direction of free rotation.

B. Methods for Axial Shaft RetentionSince backstops are not a tight fit on shafts,some methods of retention should be usedto prevent the backstop from “walking” onthe shaft, as this may cause the end of thetorque arm to contact the stirrup and causepremature bearing failure.

Illustration 2 shows some of the differentpossibilities for retaining the backstop. Theseare only suggestions and are not intended tobe all-inclusive or restrictive in any way.

C. Mount Backstop on ShaftBackstop bores are straight and finished tosize for an “easy push” fit on a shaft that isstraight and not tapered. Shafts should besmooth and free of burrs.

Coat the end of the shaft with oil, white lead,grease, or powdered graphite for easymounting of the backstop.

Check again to make certain that the arrowon the backstop cam face is in the samedirection as the desired free shaft rotation.

If shaft retention collars are to be used toretain the backstop’s position on the shaft,install the inboard collar and tighten setscrew into position.

Push the backstop on the shaft, taking careto push only on the cam face or innerlabyrinth (Part #10), thus eliminating undueabuse on the bearings within the backstop.Evidence of damage during assemblycaused by disregard of the above instruc-tions is readily traceable and Marland Clutchwill not be held responsible for failure ofsuch affected part or parts.

The outboard shaft collar, if required, cannow be installed and locked into position.

Do not use tapered keys. Keys must bestraight.

3Marland Clutch • 630-455-1752 Bulletin BC-104MA

To locate the backstop on the shaft, the keyshould be “drive tight” fit on sides only. Toprovide for adequate top of key clearance,the straight keyway in the bore of thebackstop has been made 1/32" deeper thanstandard. Overall length of the key shouldnot exceed the length of the cam and innerlabyrinths.

For backstops installed at the end of theshaft, an enclosing end cover or cap can beprovided to cover the end of the rotatingshaft. A flat cover can be used when theshaft does not extend beyond the cam face.

If the shaft does extend beyond the camface, such as when an outboard shaft collaris used, a shaft end cap can be furnished.

See Illustration 2 for end cover and end cappossibilities.

Attach “I” Beam Torque Arm to Backstop(After Rotation Check)

Attach “I” beam torque arm to the backstopwith the furnished pins and cotter keys.

Do not fasten torque arm end rigidly to steelframework in angular or axial position.

Torque arm end should have a minimum of 1/4"top clearance in its stirrup to make certain thatit does not rust in or pack tight with foreignmatter. Approximately 1-1/2" clearance shouldbe provided at each side of the torque arm foraxial positioning.

The backstop must be centered on the shaftto prevent possible ball bearing damage frommisalignment that might occur if the torquearm is held rigid.

Also, if end of torque arm is twisted crosswise,a pinching action may be imposed on the ballbearings and cause heating.

If the headshaft alignment position changes intime, the previous precautions will allow thebackstop to remain centered on the shaftwithout danger or pinching or skewing causedby a rigidly fastened torque arm end.

Safe backstop mounting is possible at anydesired angle of the torque arm. However,straight vertical mounting is not recommended.A minimum angle of approximately 5 degreesfrom vertical should be maintained (see diagramand caution on Illustration 4).

If mounted downward through floor slot, place asuitable boot or hood around torque arm at orabove floor level to keep foreign matter fromrestricting possible torque arm movement at thefloor opening.

Install Piping Kit

A. Install grease gun and grease pressure-relief fittings.Remove two plastic plugs spaced at approx-imately 180 degrees from each other on theouter labyrinth plate. Place one grease gunfitting in each outer labyrinth plate, preferablyat upper of the two openings. An angle fittingis furnished for the inboard labyrinth plate.See drawing BCMA OIL-1998 for pipingassembly.

Place one grease pressure-relief fitting ineach outer labyrinth plate. This is to beinserted in the remaining opening which islocated approximately diametrically oppositefrom the grease gun fitting to insure a fullcircle grease seal.

B. Install Oil Level Indicator/Filler DrainThe tee pipe fitting with oil drain plug andriser nipple with cap should be located at thelowest position (nearest 6 o’clock) oil inlethole of one coverplate on the easiest-to-reach side of backstop. A sufficient numberof oil inlet holes are provided to permitarrangement of the oil level indicator/fillerdrain at or near the bottom of the backstopfor any position of the torque arm. Use thefurnished wrench to remove oil hole plugs.

The highest point of riser nipple should behorizontally level with the center of the shaft.

C. Install Oil Breather Filter and FittingsRemove the pipe plug on the coverplate thatis above the center of shaft and as near the12 o’clock position as possible. Assembleand install oil breather filter fittings. Thebreather must be positioned vertically.

When the operating temperature increasesand expands the air in the backstop, it canescape at the breather-filter and not force oilthrough lip seals.


Lubrication

Before placing unit in operation, backstop mustbe filled internally with DEXRON III AutomaticTransmission Fluid (or alternative lubrication asshown in Table 1) which is readily obtainablefrom industrial oil suppliers or automotivesupply stores.

Oils containing high lubricity or EP additivesmust not be used in backstop units. Neveruse grease for internal lubrication ofbackstops. Never use carbon tetrachloride,which is detrimental to neoprene seals. Theuse of improper lubricants could cause amalfunction resulting in equipment damage.

A. To Fill With Oil1. Remove Cap from riser nipple on Oil Level

Indicator.

2. Slowly add oil through riser nipple with aclean quantity of oil as specified onnameplate, certified drawing, and on Table 2.

3. Replace Cap on riser nipple.

B. MaintenanceLubrication maintenance should not beperformed while equipment is inoperation.

In order to provide proper lubrication mainte-nance, the following procedures are recom-mended:

• Once in 3 months, add Texaco Starplex #1,#2, or equal, grease at grease fittings locatedon both ends of the backstop until freshgrease appears at relief fittings.

• Once in 3 to 6 months: (Also After First Weekof Operation)

1. Thoroughly clean around breather filter.Remove only the breather filter. Replace thebreather filter element if dirty.

2. Drain oil from lowest oil plug in TEE fitting.

3. Replace drain plug.

4. Flush unit by adding a clean quantity of oilas specified on the nameplate, certifieddrawing, or on Table 2. Allow 5 to 10 minutesoperation for flushing action.

5. Remove drain plug to drain flushing oil.

6. Replace drain plug and fill with specifiedquantity of oil as shown on the nameplate,certified drawing, or on Table 2.

7. Replace breather filter and cap on oil level-filler riser nipple.

8. Retighten coverplate bolts after first week ofoperation.

If coverplate bolts and lube fittings are keptsnug tight, then the frequency with which thebackstop’s lubrication should be inspected isan important consideration and can only bedetermined by individual experience.However, it is considered desirable toinspect the oil level of the backstop once aweek for the first month of service. Theresults of these inspections will dictate thefrequency of future samplings, but in anyevent should not exceed three to six monthintervals. Under severe working conditions, itmay be necessary to check the backstop ata more frequent interval.

400

350

300

250

200

150

100

50

0

-50Lubricant Supplier and Types

Op

erat

ing

Tem

p.R

ang

e(D

eg.F

)

General Lubrication Selection

Mobil Multi-Purpose ATF DTE-15M Aero HF(Dexron-III)

Texaco Havoline ATF Rando-HDZ 46 Aircraft Hyd. Oil(Dexron-III) 5606G

Chevron Chevron ATF Hyd. Oil AW MV 56 Aviation Hyd.(Dexron-III) Fluid A

Table 1


End Cover End Cap

Two Shaft CollarsKeeper Plate and Shaft ShoulderDouble Block Retention Key

C

Illustration 2

12

10

3

7

11

5

2

6

1

4

Bore1" clearanceon all units

1-1/2" clearancefor axial positioning(Both Sides)

Stirrup for end oftorque arm suppliedby customer.Make brackets aboveand below torque armsufficient for loadsshown in the table below.

98

1-1/2" to 2-1/2"clearanceon all units

Grease PressureFittings — See Note 1

Pull-OffHoles

C

Part # Description Part # Description Part # Description1 Coverplate 5 Outer Race 9 Torque Arm2 Gasket 6 Roller Assembly 10 Inner Labyrinth3 Ball Bearing 7 Cam 11 Outer Labyrinth4 Oil Seal 8 Torque Arm Pin 12 Grease Seal

Min. Clearance topermit backstopto center itself whilefreewheeling

Created by: Linda WeberCustomer: Warner Electric (Marland)1-4-2003Illustration 3.epsP-1346-1

Illustration 3


Preferred Position Note Gap

C

Illustration 4

Note 1: Labyrinth seals only are factorypacked with grease. Before placing inoperation, backstop must be filled internallywith recommended oil.

Do not fasten torque arm endrigidly to steel framework in angular or axialposition. Sketch at left shows that the torquearm should be mounted so that its weightholds it in contact with the stirrup in thedirection it will be backstopping.

BC “L” Approx. OilBackstop Load Capacity

Size Lbs. in Pints3MA 1,125 3/86MA 2,000 1/212MA 2,880 3/418MA 3,860 127MA 4,920 1-1/445MA 7,500 1-7/863MA 9,690 2-1/490MA 13,200 3135MA 18,420 3-1/2180MA 23,000 4-1/2240MA 28,800 6375MA 37,500 9540MA 54,000 13

Table 2


P-1346-1 Bulletin BC-104MA 7/05 Printed in USA

Warranty

Marland Clutch warrants that it will repair orreplace (whichever it deems advisable) anyproduct manufactured and sold by it whichproves to be defective in material or workman-ship within a period of two (2) years from date oforiginal purchase for consumer, commercial orindustrial use. This warranty extends only to theoriginal purchaser and is not transferable orassignable without Marland Clutch’s priorconsent.

This warranty covers normal use and does notcover damage or defect which results from alteration, accident, neglect, or improper installation, operation, or maintenance.

Marland Clutch’s obligation under this warrantyis limited to the repair or replacement of thedefective product and in no event shall MarlandClutch be liable for consequential, indirect orincidental damages of any kind incurred byreasons of manufacture, sale or use of anydefective product. Marland Clutch eitherassumes nor authorizes any other person to giveany other warranty or to assume any other obligation or liability on its behalf.

Marland Clutch800-216-3515 • 630-455-1752 • Fax: 630-455-1794www.marland.com

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P-1346-1