1、L / MIL-C-27840B(USAF) 6 November 1964 MILITARY SPECIFICATION CRANE, TRUCK MOUNTED A/S32H-ll, 4,000 POUND CRANE CAPACITY, 4 X 4 1 SCOPE 1.1 This specification covers one type of truck-mounted crane, d e s i g n a te d A/S32H-ll. Military MIL-P-514 MIL-F-3541 MIL-C-3580 MIL-H-5606 MIL-M-8090 MI L-A -
2、 842 3, MIL-C427840C( USA F) 12 April i966 SUPERSEDING 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in effect on date of invitation for bids 02 request. for proposal, form a part of this specification to the extent specified herein: SPECIFICATIONS - Plates, I d e nt if i c at i
3、o n, Transportation-Data, and Blank Fittings, Lubrication Cranes and Crane-Shovels, Truck, Crawler, and Wheel Mounted, Full Re- volving, and Their Attach- ments, Packaging of Hydraulic F lu id, Petro- leum Base, Aircraft, Mis- sile, and Ordnance M o b i 1 i t y Requirements, Ground Support Equipment
4、, General Specification for Air Transportability Re- quirements, General. Spec- ification for MIL-T-45354 Trucks and Truck Trac- tors, Commercial, Gaso- line Engine Driven, 14,000 to 34,000 Pounds GVW, 4x4 STANDARDS Military MIL-STD-10 Engineering Drawing Practices MIL-STD-129 Marking or Shipment an
5、d Storage MIL-STD-130 Identification Marking of U. S. Military Property MIL-STD-143 Specifications and Stan- dards, Order of Prece- dence for the Selection of MIL-%!TD-808 Finishes, Protective, and Codes, for Finishing Schemes for Ground and Ground Support Equip- ment MIL-STD-810 E nv i r o nm e nt
6、al T e s t M et h o d s for Aerospace and Ground Equipment MIL-STD-826 Electromagnetic Interfer- ence T e s t Requirements and Test Methods MIL-STD-831 Test Reports, Preparation of MS51335 Pintle Assembly, Towing - 18,000 Lbs. Cap., Manual Release L Provided by IHSNot for ResaleNo reproduction or ne
7、tworking permitted without license from IHS-,-,-* - - MIL-C-27840C 38 W 7777706 0235035 3 W (Copies of specifications y s t a n d a r d s , drawings, and publications required by suppliers in connection with specific pro- curement functions should be obtained from the procuring activity or as direct
8、ed by the contracting officer.) 3. REQUIREMENTS 3.1 Preproduction. T h i s specification makes provision for preproduction testing. 3.2 Components. The crane shall con- sist of at least the following major com- ponents : See Item or SystemName Requirement Chassis 3.7.1 Outriggers 3.7.2 Crane base fr
9、ame 3.7.3 Crane power source 3.7.4 Swing machinery 3.7.5 Load hoisting machinery 3.7.6 Boom hoisting machinery 3.7.7 Boom 3.7.8 Operators cab 3.7.9 Operators controls 3.7.10 Electrical System 3.7.11 3.3 Selection of specifications and stan- dards. Specifications and standards for necessary commoditi
10、es and services not specified herein shall be selected in accordance with MIL-STD-143. 2 3.4 Materials- Materials shall be as specified herein, Materials not definitely specified shall be of the best commercial quality and entirely suitable for the pur- pose. Materials shall be free from all defects
11、 and imperfections that might affect the serviceability of the finished item. 3.4.1 Thermal insulation material. All insulating material shall maintain its shape and not settle, sag, pack, absorb water, or disintegrate under the vi- brations and temperatures encountered in use. All insulation shall
12、be fire resistant. 3.5 Design and construction. Thecrane shall be so designed and constructed that no parts will work loose in service. It shall be built to withstand the strains, jars, vibrations y and other conditions incident to shipping, storage, and service. 3.5.1 Reliability. The crane shall h
13、ave a minimum MTBF (mean-tinie-between- failures) of 43 hours with a minimum reliability of 0.98 for a l-hour mission at a confidence factor of 0.90 (see 6.3.1 and 6.3.2). 3.5.2 Maintainability. The crane shall be designed and constructed as specified herein and to provide the following: a. Minimum
14、number of parts consistent with reliability and performance speci- fie d herein b. hlinimum amount of training and time necessary for assembly, disassembly, location of trouble sources, and mainte- nance including servicing. Where prac- tical, parts and c o m p o n e n t s shall be located or positi
15、oned for rapid and slmple inspection and recognition of excessive wear or potential failure Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-27B9OC 38 777770b 021503b 5 c. Permit adjustments, servicing, re- placement of parts and components, and
16、 other maintenance with minimum distur- bance to other equipment parts or com- ponents. Parts and components shall be located for ample and rapid access unless performance or reliability will be ap- preciably degraded by the accessible lo- cation. In performing maintenance, if en- gineering reasonin
17、g or data determines that physical or visual interference be- tween items cannot be avoided, the item predicted to require the most maintenance shall be located for best accessibility d. Permit maintenance with general- purpose tools and equipment normally available commercially. Use of special- pur
18、pose tools and e quip m en t shall be subject to approval by the pro- curing activity e. Minimum number of tools required for maintenance by design practices such as reducing-the variety of bolt head sizes to the practicable minimum f. Foolproofness - Where improper in- stallation of an item could c
19、ause mal- function of the item or the equipment in which it is installed, an unsymmetrical mounting means shall be provided where practical. That mounting shall allow the item to be installed only in its proper operating position. If an unsymmetrical mounting means is not practical, the item shall b
20、e so mounted that its proper operating position can be readily and visibly determined by service maintenance personnel. 3.5.3 Safety features 3.5.3.1 Guards. All rotating and recip- rocating parts that are located in a position which constitutes a hazard to operating personnel shall be fully enclose
21、d MIL-C-27 840C (USAF) or properly guarded. All exposed parts that are subject to high operating tem- peratures or electrically energized shall be insulated, fully enclosed, or adequately guarded. A guard shall be provided for the engine fan. 3.5.3.2 NonskkQurfaces. All running boards, steps, and wa
22、lkways external to the cab shall be skidproof. 3.5.3.3 Boom capacity indicators 3.5.3.3.1 Boom angle indicator. A pen- dulum type boom angle indicator shall be provided and so mounted as to be easily read in the crane cab. 3.5.3.3.2 Boom length indicator. A boom length indicator shall be provided fo
23、r the crane operator to readily determine boom length. 3.5.3.3.3 Boom capacity chart. A boom capacity chart shall be provided in the crane cab to be used in conjunction with the boom length indicator and boom angle indicator. * 3.5.3.4 Safe load control device. A de- vice shall be provided to limit
24、the lifting operations to -loads of not greater than 85 percent of insipient tipping loads at all radii, both with and without use of the outriggers. This device shall govern the cranes operations to prohibit over- loading at all radii, with maximum to minimum boom lengths, when the max- imum safe l
25、oad-radius c o m b i n at i o n is reached. Visual and audible warnings shall be provided to warn the operator of the approach to the safe load limits. * 3.5.3.5. Deadman control and automatic brakes. With manual release of any cran- ing motion, the operators control shall automatically apply brakes
26、 to that motion, 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-27840C (USAF) immediately stopping and restraining that motion within all rated load conditions. Each boom actuating mechanism shall be provided with safety features to prevent
27、descent of the load in the event of power failure or failure of the hoist line mech- anism, boom angle mechanism, or boom length mechanism. An additional locking device shall be provided to automatically prevent change of boom angle in the event of boom angle mechanism failure. 3.5.3.6 H o i s t sys
28、tem failure. Means shall be provided to prevent injury to the operator in the event of breakage of either the boom hoist system or the load hoist cable. * 3.5.4 Lubrication. The crane shall be designed and constructed to operate sat- isfactorily when lubricated with the stan- dard military lubricant
29、s specified in MIL-M-8090. * 3.5.4.1 Lubrication fittings. Lubri- cation fittings shall conform to MILF- 3541 and shall be located in accessible, protected positions. Extended fittings shall be provided to lubricate parts or as- semblies that are not readily accessible for direct lubrication or whic
30、h are likely to be overlooked because of in- accessibility. * 3.5.4.2 Lubrication chart. A lubrica- tion chart shall be provided directing attention to all lubrication fittings and shall specify the range and grade of lubricant required for critical tempera- tures. The chart shall be permanently att
31、ached to the unit in an accessible and convenient location. 3.5.5 Steps or ladders. Steps or ladders shall be provided and properly located - to provide- safe and easy access to both the truck and crane. 3.5.6 Air transportability. The crane shall be designed for air transportability in the assemble
32、d condition -in a Type C-124 aircraft in accordance with MIGA- 8421. 3.6 Performance 3.6.1 E nv i r o nme n t al co n d i t io n s. The crane shall be capable of operating without winterization aids in ambient tem- peratures ranging from +125 to -20F. 3.6.2 Mobility. When fully equipped, the crane s
33、hall attain the performance, on dry, level concrete or asphalt surfaces, as specified in MILT-45354. * 3.6.3 Lifting capacity. The crane with outriggers extended shall be capable of handliig a 4,000-pound load withthe load at a radius (see 6.3.3) of 16 feet, lift- ing and lowering the load verticall
34、y at speeds up to 45 fpm. Without the out- riggers extended, the crane shall be capable of lifting a 2,000-pound load at a radius of 16 feet, lifting the load vertically until the hook is 6 feet above the ground. With these loads suspended just above the ground, the crane shall be capable of rotatin
35、g 270“ at a speed up to but not exceeding 4 rpm. The re- volving motion shall be capable of stopping at any position relative to the chassis. The distance between the hook and the rear of the truck chassis or outriggers shall be at least 5 feet during this rotation. For . precision operation, the cr
36、ane shall permit hoisting and lowering of all rated loads at a slow rate, single line speed of 2 fpm or less. Free spooling of line will not be permitted. Operation at any given hoist- ing or lowering speed and at varying speeds shall provide smooth and steady movement of a load. Under any of these
37、conditions, no component of the crane shall be stressed to exceed 60 percent of its design yield 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-E MIL-C-27840C 38 W 7779706 0235038 7 m MIL-C-27 840C(USAF) strength, and the crane shall not be 3.7.1.
38、2 Exceptions to truck re- stressed to exceed 85 percent of its quirements. The following items as-oT- tipping load capacity. fered anddescribed in MIL-T-45354 shrill not be provided * 3.6.3.1 Transporting capacity. Without auxiliary support, the crane shall be a. Spare wlieel or rim capable-of tr-in
39、sprting for 100 feet on a level concrete road a 2,000-pound load, b. Spare wheel carrier 10 feet in length, 4 feet in height, and4 feet in width. c. Spare tire 3.7 Details of components d. Tools. 3.7.1 Chassis. The chassis shall be a 3.7.1.3 -_ Overtemperature - shutdown de- 4 by 4 vehicle conformin
40、g to MIL-T- vice. The truck engine shall be equipped 45354, type I, class as required. The with an automatic overtemperature shut- crane base shall be mounted thereon for down device to prevent damage to the support of the entire crane and loads. engine by overheating. - 3.7.1.1 Additional truck req
41、uirements. The following items as offered and de- scribed in MIL-T-45354 shall be provided: * a. Frame reinforcement for type I ve- hicle (Structural steel shape beams without additional reinforcement may be substitut- ed as truck frame members provided the section modulus is equal to or greater tha
42、n a reinforced frame) 3.7.1.4 Low oil pressure shutdown de- vice. The truck enKine shall be equipped - - - with an automatic “OW oil pressure shut- down device to prevent damage to the engine due to inadequate oil pressure. 3.7.1.5 Hand throttle. The truck engine shall be equipped with a locking typ
43、e hand throttle to assure proper enginerpm when operating the crane. b. Suspension lockout devices. Readily actuated or adjustable suspension c. Rear wheel splash and stone throw lockout devices shall be furnished to pro- protection vide maximum stability during operation of the crane. The suspensio
44、n lockout devices d. Positive crankcase ventilation shall be removable and replaceable so that spring and shock absorber main- e. Air over hydraulic brakeswithtrailer tenance and repair is not degraded. air connections and controls 3.7.2 Outriggers. Four power-operated f. Trailer lighting connection
45、s andcable outriggers shall be provided at the sides of the chassis for stability when lift- g. An all steel two-man beside the engine ing maximum loads. Outriggers shall be type cab may be provided in lieu of a adaptable to manual raising, lowering, full width cab and locking, and shall not extend
46、beyond the width limits of the chassis when in h. Front-mounted winch. the raised position. The outriggers shall Pintle hook conforming to MS51335 * 3.7.1.6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-t MIL-C-278qOC 38 m 777970b 0235037 O m L MIL
47、-C -2 7 840 C (USA F) c be capable of lowering to a point at least or controls in the hydraulic system. The 3 inches below ground level to provide hydraulic oil reservoir shall be equipped adequate outrigger support on uneven with a bayonet type gage or other device terrain. to determine the correct
48、 oil level. 3.7.3 Crane base frame, The crane base frame shall be of heavy structural steel members rigidly fastened to the chassis frame. 3.7.3.1 Bearing swing gear circle. A bearing, swing gear circle shall be fasten- ed to the crane base. It shall support the revolving crane frame by means of lar
49、ge diameter, double-row ball bearings, or equal. The bearings and raceways shall be packed in grease and protected by a grease labyrinth seal. The swing gear circle shall transmit all crane loads to the crane base. 3.7.3.2 Revolving frame. The revolving frame shall be of heavy structural steel members rigidly fastened to the upper portion of the ball bearing swing gear circle. It shall be properly shaped and con- structed to mount and carry the loads of all components w
