MA Series part 1 - Coffing Hoists, Coffing Hoist Parts

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IiSECTION IVIt'IAINTENANCE4-1. INSPECTIOI{S.4-2. A planned inspection routine should be establishedfor this hoist based upon frequency of use,severity of use, and environmental conditions. Someinspections should be made frequently (daily to monthly)and others periodically (monthly to yearly). It isstrongly recommended that an Inspection and MaintenanceCheck List and an Inspector's Report similiarto those shown in figures 4-4 and 4-5 be used andfiled for reference. All inspections should be made by,or under the direction of a designated inspector.Special inspections should be made following anysignificant repairs or any operating occurence leadingone to suspect that the hoist's capabilities may havebeen impaired. Refer to paragraphs 4-13 and 4-25 forassistance in any disassembly and assembly necessaryfor inspections and subsequent replacementor repair. Prior to inspection, clean parts as required.See paragraph 4-21.4_3. FREOUENT INSPECTIONS.4-4. Perform the following inspections daily prior toinitial use of the hoist. Also, observe during operationfor any damage which might appear between regularinspections.CAUTION: Any unsafe condition disclosed by the inspectionshall be corrected before operation of thehoist is resumed. Adjustments and repairs shall bedone only by designated personnel.a. Inspect the hooks for deformations, chemicaldamage or cracks. Hooks damaged by chemicals, deformationor cracks, or having throat openings greaterthan the "Maximum Allowable Opening" shown in figure4-1 must be replaced. If the hook is twisted morethan 10 degrees from the plane of the unbent hook, itmust be replaced.Note: Any hook that is twisted or has throat openingsin excess of those listed in figure4-1 indicates abuseTHROAT OPENING(w,/o LATCH)HOISTREJECT HOOK OPENINGMODEL NO.TOP HOOK BOTTOM HOOKMA-15 r-7 /32" r-7/32"MA-15-2 r-7 /32" L-7 /32"MA-15-2W r-7 /32" r-7 /32"MA_30 r-13/32" r-r3/32"MA-30-2 r-3/ 4" r-3/ 4"MA-30-2W r-3/4" r-3/ 4"MA-30-3 2-S/32" 2-5/32"MA-30-4 2-s/32" 2-5/32"FIGURE 4-1. HOOK THROAT OPENINGor overloading of the hoist. Other load bearing componentsshould be inspected accordingly.b. Check that both hooks swivel freely.c. Check the hoist handle for bends. If the handleis bent, the hoist has probably been highlyoverloaded. A qualified service man should inspebtthe hoist for other damage or return the hoist to thefactory.d. Check load chain for wear, twist and distortion_and ensure that dead end ring or connection issecure. Also check the chain for presence of foreignmaterial and adequate lubrication.4-5. PERTODIC INSPECTIONS.4-6. It is recommended that the following inspectionsbe performed at one to 12 month intervals. The exactperiod of inspection will depend on frequency and typeof usage. Determination of this period will be basedon the user's experience. It is recommended that theuser begin with a monthly inspection and extend theperiods to quarterly, semi-annually or annually basedon his monthly experience.CAUTION: Any unsafe condition disclosed by theinspection shall be corrected before operation of thehoist is resumed. Adjustments and repairs shall bedone only by designated personnel.a. Perform all the frequent inspections listedin paragraph 4-4.b. Check nuts. bolts and other hardware forlooseness, stripped or damaged threads.c. Check load sheave and chain attachmentsfor distortion, cracks and excessive wear.d. Check pawls for excessive wear, bindingand missing or broken pins.e. Check pawl springs for breaks, corrosionand continued ability to hold pawl properly:f. Check load pawl shaft for excessive wear.g. Inspect gear and pinion shaft for adequatelubrication, cracks, distortion, worn or broken teeth.h. Inspect bearings for adequate lubrication,distortion. cracks and excessive wear.i. Check housing, covers, swivel frames, loadblocks and outrigger for cracks and distortion.j. Inspect hub for damage to threads. Checkhub and thrust washer for scoring or other damage tobraking surfaces.k. Check brake discs for excessive wear,glazing or oil contamination. Replace discs worn to athickness of 5/64 inch or less.l. Inspect seals, "o" rings an! gaskets fordeterioration and wear.m. Inspect decal and capacity plate forlegibility.n. Inspect supporting structure for continuedability to support imposed loads.o. Inspect the chain for gouges, nicks, weldsplatter, corrosion and distorted links. Slacken thejtIf,lAmericrane & Hoist Corp 1-800-652-1932
chain and inspect for wear at contact points. If wearis observed, or if stretching is suspected, measurethe chain per paragraph 4-10. If any portion of thechain is worn, nicked, twisted or stretched, replacethe whole chain.CAUTION: Do not attempt to reweld sections of thechain and do not try to add on to the chain. Use onlychain supplied by our company, it is specially manufacturedto very close tolerances of dimension,composition and heat treatment. A substitute chainmay damage the load sheave, Never use "missinglinks" because they will jam in the load sheave.p. Check hooks for cracks using dye penetrant,magnetrc particle or other suitable detection method.4-7. INSPECTION OF HOIST NOT IN REGULAR USE.4-8. If the hoist has been idle for one month or more,perform the inspections listed in paragraph 4-4. If thehoist has been idle more than six months, perform theinspections listed in paragraph 4-6.4-9. CHECKING CHAIN FOR WEAR.4-10. Chain inspection and evaluation is a veryimportant phase of hoist maintenance. In general,removal of the load chain from the hoist is not necessary.To check the load chain for excessive wear,proceed as follows:a. Inspect the chain for"elongation", which isa condition caused by overloading or wear. Table IIshows the normal and reject lengths for MA hoistchain. A cnain gauge similiar to that shown in figure4-2 or a Vernier caliper may be used. Hang the chainup or stretch it out on a work table in a taut position.Place one edge of the gauge or caliper over the end ofa chain link. The number of links within the gaugelimits will correspond to the "Number of Links" asindicated in Table II. If the last link, which should bewithin the gauge limits, makes contact or extends pastthe inside edge of the gauge, or if the reading of theREJECT LENGTH SEE TABLE IINORI\4AL LENGTH -FIGURE 4-2. CHAIN SALVAGE GAUGEVernier caliper is equal to or greater than the "RejectLength", the entire chain shall be replaced. If thelast link does not contact the edge of the gauge, or theVernier caliper reading is less than the "RejectLength", check the chain along its entire length. Ifall readings are within tolerance, the chain is free ofelongation.b. Inspect each individual chain link for wearto diameter of the link. See figure 4-3. The nominaldiameter of the link is 0.250 inch for the JL-19-Bchain and 0.312 inch for the C-19-10 chain. If thediameter for arty link of JL-19-B chain is less than0.200 inch, replace the entire chain. If the diameter ofany link of C-19-10 chain is less than 0.275 inch,replace the entire chain.WEAR INTHESE AREASFIGURE 4-3. TYPICAL WEAR ON LINKS4-11. LUBRICATION.4-L2. Proper lubrication is necessary for a long andrelatively trouble-free hoist operation. Refer to thefollowing and to Table III, Recommended LubricationSchedule, for lubrication points, type of lubricant andfrequency of lubrication.a. LOAD CHAIN. Clean the load chain'withacid-free solvent and coat with Coffing Chain LubricantNo. H-7595, or equivalent. Allow oil to work intoeach link end and be carried into the sheave pockets.Wipe excess oil to prevent dripping.b. During periodic inspection apply a light coatingof Coffing No. H-7577 grease to bearing surfaces of loadpawl shaft; to grease seals; to o-rings; to pinion shaft andgear teeth; and to all bearings. Use H-7593 grease on gearteeth.c. BOTTOM HOOK BEARING. Invert bottomhook and allow a few drops of SAE 20-30 oil to rundown the hook shank and into the swivel.d. TOP HOOK. Allow a few drops of SAE20-30 oil to run down between the housing and hookshank.CHAINPART NO.NOM.DIA.NO. OFLINKSTABLE II. LOAD CHAIN LINKNORMAL LGTH.FOR NO. LINKSREJECT LGTH.FOR NO. LINKSGAUGENUMBERJL-19-B* .250 19 14.776 14.957 cA-3441c-1 9-10** .3t2 19 17.832 18.069 cA-344L-2*Used on MA-15, MA-15-2 and MA-15-2W. **Used on MA-30, MA-30-2, MA-30-2W, MA-30-3 and MA-30-4.Americrane & Hoist Corp 1-800-652-1932
Page 1 and 2: vCOFFINGOPERATING & MAINTENANCEINST
Page 3 and 4: sEcTroN IINTRODUCTION Americrane &
Page 5: operator should not engage in any p
Page 9 and 10: INSPECTION AND MAINTENANCE CHECK LI
Page 11 and 12: TABLE IV. TROUBLESHOOTING CHART,rw-
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Page 18 and 19: PARTS LIST FOR MODEL MA.15 HOISTInd
Page 20: PARTS LIST FOR MODEL MA.15-2 AND MA
Page 24: FPARTS LIST FOR MODEL MA.3O-2 AND M

MA Series part 1 - Coffing Hoists, Coffing Hoist Parts

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