1、 INCH-POUND MIL-H-904J13 June 1991SUPERSEDINGMIL-H-904H6 September 1977MILITARY SPECIFICATIONHOISTS, CHAIN, HAND-OPERATED, HOOK AND TROLLEY SUSPENSIONThis specification is approved for use by all departments and agencies of theDepartment of Defense.L SCOPE1.1 Scope. This specification covers hand-op
2、erated chain hoists.1.2 Classification Chain hoists6.2):1.2.1 Classes. Hoists shall be ofmust be classified asthe following classes:Class 1 Class 2 -Class 3 -Cast steel, forged steel, and malleablespecified in 1.21 through 1.23 (see -or high strength cast iron used forgeneral material handling.Light
3、 weight materials which have been selected for the primary purpose ofproducing a light net weight unit consistent with required strength andservice used for general material handling.Free of east iron load bearing parts, used for special purpose services (suchas reactor component handling).Beneficia
4、l comments (recommendations, additions, deletions) and any pertinent data which may be of use inimproving this document should be addressed to Commander, Naval Sea Systems Command, SEA 55Z3, Depart-ment of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Impro
5、ve-ment Proposal (DD Form 1426) appearing at the end of this document or by letter.AMSC N/A FSC 3950DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.lProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-904J1.2.2 Type
6、s. Chain hoists shall be of the following types. Type H shall be as specified (see6.2).Type C - Link chain,Type D Link chain,Type E Link chain,Type F - Link chain,Type G- Link chain,hook suspensionplain trolley suspensiongeared trolley suspensionlow headroom, plain trolley suspensionlow headroom, ge
7、ared trolley suspensionType H Link chain, or roller chain, hook suspension, lever operated, fixed orconvertible capacity.1.23 Capacities. Hoist capacities shall be as specified (see 1.2).2. APPLICABLE DOCUMENTS2.1 Government documents.2.1.1 Specifications, standards, and handbooks. The following spe
8、cifications, standards, andhandbooks form a part of this document to the extent specified herein. Unless otherwise specified,the issues of these documents are those listed in the issue of the Department of Defense Indexof Specifications and Standards (DODISS) and supplement thereto, cited in the sol
9、icitation (see6.2).SPECIFICATIONSFEDERALPPP-F-320 Fiberboard; Corrugated and Solid, Sheet Stock (ContainerGrade), and Cut ShapesQQ-B-728 Bronze Manganese; Rod, Shapes, Forgings, and Flat Products(Flat Wire, Strip, Sheet, Bar, and Plate)TT-E-49O Enamel, Silicone Alkyd Copolymer, Semigloss (for Exteri
10、or andInterior Use)MILITARYMIL-S-901 Shock Tests, HI (High-Impact); ShipboardEquipment and Systems, Requirements forMachinery,MIL-E-917 Electric Power Equipment, Basic Requirements (Naval ShipboardUse)Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-M
11、IL-H-904JMILITARY (continued)MIL-H-3280MIL-L-17331MIL-L-19140MIL-P-23236MIL-P-24441MIL-P-24441/lMIL-P-24441/2DOD-G-24508MIL-C-24707/5STANDARDSMILITARYMIL-STD-278MIL-STD-792Hoists, Chain, Manually Operated, Packaging ofLubricating Oil, Steam Turbine and Gear, Moderate -ServiceLumber and Plywood, Fire
12、-Retardant TreatedPaint Coating Systems,(Metric)Paint, Epoxy-Polyamide,Paint, Epoxy-Polyamide,Paint, Epoxy-Polyamide,151, Type IFuel and Salt Water Ballast Tanks;General Specification forGreen Primer, Formula 150, Type IExterior Topcoat, Haze Gray, FormulaGrease, High Performance, Multi-Purpose; (Me
13、tric)Iron Castings, Nodular Graphitic (Ductile Iron) and Nodular -Graphitic (Corrosion Resisting, Austenitic, Low MagneticPermeability) (For Shipboard Application)Welding and Casting StandardIdentification Marking Requirements for Special PurposeComponents(Unless otherwise indicated, copies of feder
14、al and military specifications, standards, and handbooksare available from the Standardization Documents Order Desk, Building 4D, 700 Robbins Avenue,Philadelphia, PA 19111 -5094.)2.1.2 Other Government publication. The following other Government publication forms apart of this document to the extent
15、 specified herein. Unless otherwise specified, the issue is thatcited in the solicitation.3Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I PUBLICATIONMIL-H-904JNAVAL SEA SYSTEMS COMMAND (NAVSEA)NAVSHIPS 0900-LP-003-8000 Surface Inspection Acceptanc
16、e Standards forMetals(Application for copies should be addressed to the Naval Publications and Forms Center, (ATTN:NPODS), Standardization Document Order Desk Building 4D, 700 Robbins Avenue, Philadelphia,PA 19111 -5094.)2.2 Non-Government publications. The following documents form a part of this do
17、cumentto the extent specified herein. Unless otherwise specified, the issues of the documents which areDOD adopted are those listed in the issue of the DODISS specified in the solicitation. Unlessotherwise specified, the issues of documents not listed in the DODISS are the issues of thedocuments cit
18、ed in the solicitation (see 6.2).AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)A 48 Standard Specification for Gray Iron Castings; (DOD adopted)B 26 Standard Specification for Aluminum-Alloy Sand Castings;(DOD adopted) ,B 108 Standard Specification for Aluminum-AIloy Permanent Mold Castings;(DOD
19、adopted)B 633 Standard Specification for Electrodeposited Coatings of Zinc on Ironand Steel; (DOD adopted)B 695 Standard Specification for Coatings of Zinc Mechanically Deposited onIron and Steel.(Application for copies should be addressed to the American Society for Testing and Materials,1916 Race
20、Street, Philadelphia, PA 19103.)STEEL STRUCTURES PAINTING COUNCIL (SSPC)SP 10 Near-White Blast Cleaning; (DOD adopted)(Application for copies should be addressed to the Steel Structures Painting Council, 4400 FifthAvenue, Pittsburgh, PA 15213.)Provided by IHSNot for ResaleNo reproduction or networki
21、ng permitted without license from IHS-,-,-MIL-H-904J.(Non-Government standards and other publications are normally available from the organizationsthat prepare or distribute the documents. These documents also may be available in or throughlibraries or other informational services.)2.3 Order of prec
22、edence. In the event of a conflict between the text of this document andthe references cited herein, the text of this document takes precedence. Nothing in this document,however, supersedes applicable law and regulations unless a specific exemption has been obtained3. REQUIREMENTS 3.1 Qualification
23、and first article. Qualification and first article requirements, as applicable,shall be as specified (see 3.1.1 and 3.1.2).3.1.1 Qualification. Class 1 and class 2 hoists of each type and capacity furnished under thisspecification shall be products which are authorized by the qualifying activity for
24、 listing on theapplicable qualified products list at the time of award of contract (see 4.3 and 6.5).3.1.2 First article When specified (see 6.2), a sample shall be subjected to first articleinspection (see 6.6). First article inspection is not required for hoists on the qualified products list.3.2
25、Materials. Material used shall be as specified in 3.2.1 through 3.2.3.3.2.1 Class 3 hoists. Metal castings, weldments, and steel forgings used for load bearing partson class 3 hoists shall be inspected as specified (see 4.4.1). Cast iron shall not be used for loadbearing parts. Cast iron for non-loa
26、d bearing parts shall be in accordance with MIL-C-24707/5 orASTM A 48, class 35 or better. Aluminum castings for load bearing or non-load bearing partsshall be in accordance with ASTM B 26 or ASTM B 108, type UNS A03560, temper T6.3.2.2 Recovered materials. Unless otherwise specified herein, all equ
27、ipment, material, andarticles incorporated in the products covered by this specification shall be new and may befabricated using materials produced from recovered materials to the maximum extent practicablewithout jeopardizing the intended use. The term “recovered materials” means materials which ha
28、vebeen collected or recovered from solid waste and reprocessed to become a source of raw materials,as opposed to virgin raw material None of the above shall be interpreted to mean that the useof used or rebuilt products is allowed under this specification unless otherwise specifically specified.3.2.
29、3 Prohibited material. Material prohibited for equipment used aboard ship shall be asfollows:Cadmium in any formb. Asbestosc. Magnesium or magnesium based alloys (does not include steel or aluminum whichcontain less than 0.1 percent magnesium).5Provided by IHSNot for ResaleNo reproduction or network
30、ing permitted without license from IHS-,-,-MIL-H-904J3.3 Construction (see 6.3). The hoist construction shall ensure trouble-he hoist service life.Rotating shafts shall be supported in anti-friction, lubricated or self-lubricated bearings or bushings.Shaft bushings or bearings shall be enclosed agai
31、nst entry of foreign matter. Rotating and slidingsurfaces shall be lubricated. The hoist shall include a brake to provide positive control of the hoistload at all times. Hoists shall operate at environment temperatures of 0 through 130” degreesFahrenheit. Metals susceptible to corrosion attack in a
32、seawater environment shall be treated,plated, or painted to provide corrosion resistance Chain replacement shall be accomplished by useof simple hand tools. Chain hoists shall have a spur or helical geared reduction mechanism Leverhoists may be direct drive or ratchet and pawl drive Gears shall be e
33、nclosed against foreign matter(such as dirt, dust, and water spray) in a casing that will permit ready access for inspection andcleaning. Positive means of securing loose parts such as nuts, bolts, collars, and check rings shallbe provided to prevent any component working loose. The hoists shall be
34、comqlete in all respects,including operating controls and other equipment that may be necessary for operation. Themaximum combined stress in component parts shall not exceed 35 percent of the tensile yieldstrength of the material for hoist operation at rated load. The maximum combined stress incompo
35、nent parts shall not exceed 70 percent of the yield strength of the material (see 4.7.1 and4.7.2). For all classes of hoists at rated load, the safety factor for load bearing parts shall be aminimum of 3, based on the yield strength of the materials used; or a minimum safety factor of 5,based on the
36、 ultimate strength, whichever provides the lowest design stress. For hoists requiringrepair parts, all wear parts shall be readily accessible for replacement. Equivalent spares for thesame class and type hoists shall be interchangeable.3.3.1 High-impact shock When specified (see 6.2), the hoist shal
37、l withstand the grade Aor B high-impact shock test as specified in MIL-S-901 (see 4.7.9). When specified (see 6.2),unloaded hoists, when stowed (not operating) on the rail, shall withstand high impact shock inaccordance with grade A of MIL-S-90l, without permanent deformation or degradation of anyop
38、erating functions It will be permissible for trolley hoist to drift along track under shockconditions, provided no damage to trolley hoist or brake results and brake holds hoist to rail aftershock. Drift shall be not greater than 1 inch. Motor shall be bolted to the frame.3.3.2 Load chain and hand c
39、hain. Load chain shall be alloy steel and hand chain shall becarbon steel or alloy steel. Chain finish shall be as specified in 3.3.2.3.3.3.2.1 Load chain. The load chain shall be of a hardness and strength to withstand theapplicable tests specified in 4.7.1 through 4.7.9 and a safety factor of 5 fo
40、r the rated load of thehoist, based on the ultimate strength of the material.3.3.2.1.1 Load chain (link chain type). The load chain links shall be electric- or forge-welded. Each link shall be of uniform size and shape, free from scale and laminations at the welds,and shall seat properly in the hois
41、t chain sheave pockets. The chain shall be free from anytendency to snarl. The ends of the load chain shall be securely attached to the load block or hookProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-904Jswivel (except multiple reeved) and to
42、 the hoist, or provided with a means to prevent the end ofthe chain passing through the hoist. The ends of the load chain shall also permit readyreplacement of the chain.3.3.2.1.2 Load chain (roller chain type). The load roller chain shall be a free-rolling rollerchain which is readily replaceable.
43、Material for pins, bushings, rollers, and sidebars of roller chainsshall be carbon or alloy steel and shall be of a hardness and strength to withstand the applicabletests specified in 4.7.1 through 4.7.9 and a safety factor of 5 for the rated load of the hoist, basedon the ultimate strength of the m
44、aterial.3.3.2.2 Hand chain. The hand chain shall be endless link chain and shall have a drop whichis approximately 2 feet less than the specified lift of the hoist. The hand chain shall have aminimum rated strength of at least three times the maximum chain pull required to lift the ratedload. Connec
45、ting links are permitted. The hand chain shall be of a hardness and strength towithstand the applicable tests specified in 4.7.1 through 4.7.9. The hand chain wheel shall becompatible with the chain material selected.33.2.3 Finish. The link load chain, the link hand chain, and the hook safety device
46、 shall beprotected by electro-deposited zinc to resist corrosion. Zinc coating shall conform to type I, classFe/Zn 13 of ASTM B 633 or type I, class 25 of ASTM B 695. The plating process shall be suchthat there will be no impairment in free movement of any chain link after plating. The rollerchain s
47、hall have a blue oxide finish supplemented by a coating of “combination lubricant and rustpreventative.3.3.3 Load chain sprocket and shaft. The load chain sprocket for link chain hoists shall havepockets accurately shaped to fit the link of the load chain. The load chain sprocket for rollerchain hoi
48、sts shall accommodate the links of the roller chain. The load chain sprocket may beintegral with or rigidly connected to the load chain shaft. Welding of the load chain sprocket tothe shaft is not permitted.3.3.3.1 Chain guides. Enclosed chain guides shall be provided to assure that the hoist loadch
49、ain enters the sprocket in the proper position to prevent misalignment or jamming of the hoistload chain and sprocket. These guides, if bolted on, shall have locknuts or other means to preventloosening under vibration.3.3.4 Hand chain wheels. Hand chain wheels shall have accurately shaped pockets to fit thehand chain. The wheels shall be equipped with a chain guide that will permit operation of thehand chain from an angle 10 degrees out from either side of the cha
