1、MIL-STD-268C NOTICE 3 39 m 9793933 0069220 3 m MI L-STD-268C 17 Julv 1963 SUPERSEDING MIL-STD-268B 0 Sepfembr 1950 MI LI TA RY .STAN DARD TEST AND INSPECTION OF TRUCKS, LIFT, FORK / THIS DOCUMENT CONTAINS g5 PAGES. , I Provided by IHSNot for ResaleNo reproduction or networking permitted without lice
2、nse from IHS-,-,-MIL-STD-2bC NOTICE 3 37 m 77777LL 0069223 3 m MIL-STD-268C 17 July 1963 DEPARTMENT OF DEFENSE WASHINGTON 25, D. C. Test and Inspection of Trucks, Lift, Fork MIL-STD-268C 1. This standard has been approved by the Department of Defense and is mandatory for use by the Departments of th
3、e Army, the Navy, and the Air Force, effective 17 July 1963. 2. Recommended corrections, additions, or deletions should be addressed to Headquarters, DSA, Standardization Division, Washington 26, D. C. ii . . -A- Provided by IHSNot for ResaleNo reproduction or networking permitted without license fr
4、om IHS-,-,-f - MIL-STD-2bC NOTICE 3 37 W 97797LL 0067222 5 = MIL-STD-268C 17 July 1969 FOREWORD The purpose of this standard is to provide guidance in the methods and procedures for testing and inspecting the performance of internal com- bustion engine powered and electric powered fork lift trucks,
5、including reaching and tiering trucks. The performance requirements to be tested are cited in each specification covering this type of equipment. The procedures outlined in each test form are intended as guides. Alter- nate test procedures may be substituted providing the same results are achieved.
6、However, any deviation from these methods and procedures will be subject to approval by the test officer under whose direction the tests are being conducted. Department of Defense Quality Control Concept requires the contractor to be responsible for the control o qualit-y in products and for offerin
7、g to the military departments for acceptance only those produ 71 20 July i964 2. The following pages are to be added: . New Page Date Supersedes Page Date 72 28 January i965 II I- 73 28 January 1965. -9 II 3. The following is a cumulative li this time except that either a clutch facing or clutch pla
8、te, or both, when used, may be replaced at any time after 1200 circuits of the test course have been negotiated, except the replacement may be after 900 circuits for trucks over 10,000 pound capacity. 5.2.2.4 Method of negotiat;ng course. The truck under test shall begin each lap at the point labele
9、d “START” on Drawing C. As the operator starts the truck he shall oper- ate the horn for approximately 1 second. On lap number 1, it shall proceed in a for- ward direction following the centerline along Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,
10、-MIL-STD-2bC NOTICE 3 37 m 77777LL 00b7234 L m Mll-STD-268C 17 July 1963 the portion of the course marked “A” until it reaches the first pallet area. The test load will have been placed in this location on the stack marked “X.” The truck shall make a 90” right hand turn in 1 motion without backing;
11、proceed to the face of the pallet stack marked “X”; and remove the loaded pallet. It shall back out of the stack aisle into the main aisle, making a 90” left hand turn in 1 motion, without going forward, and proceed rear- ward along the main aisle in the portion of the course marked “B until it reac
12、hes the second pallet area. The truck shall proceed rearward .to a point beyond the pallet area opening, re- verse its direction, and move forward to the face of the pallet stack marked “Y,” making the 90” right hand turn in 1 motion without backing. It shall place the test load on top of the pallet
13、 stack marked “Y.” The truck shall back out of the stack aisle into the main aisle making the 90” left hand turn in 1 motion without going forward, and proceed forward along the main aisle in the portion of the course marked “C” until it reaches the third pallet area. The truck shall make a 9Q” righ
14、t hand turn in 1 motion without backing, and pick up a test load which has been placed in the location marked “Z.” It. shall back out into the main aisle, making the 90” right hand turn in 1 motion, and proceed further along the main aisle in the portion of the course marked “D” until it reaches the
15、 portion of the course marked “E,” containing the obstacle blocks. The obstacle blocks shall be traversed by the truck being driven through this area in a straight line so that its left wheels pass over the first block and the right wheels pass over the second block. This part of the test may be con
16、ducted at low speed with the transmission in low gear. However, the truck shall not be stopped prior to or while going over the blocks. The truck shall proceed further along the main aisle in the portions of the course marked “F” and “G” until it reaches the position on the ramp labeled “Stopping Po
17、int.” The driver shall stop the truck, shift gears, if the truck has a manual shift trans- mission, and then resume ascending the ramp. After the top of the ramp is reached, shift back to high gear and proceed along the main aisle in the portion of the course marked “J,” “K,” and “L.” When the truck
18、 reaches the portion of the course marked “M,” the operator shall stop. On every other lap, the operator shall turn off the ignition and restart the engine. After completion of this pwtion of the test proceed along the main aisle and start the next cycle. All stops shall be at the maxi- mum safe dec
19、eleration rate. The operator shall actuate and release the parking brake at least once duing each circuit, The next step is to re-enter the portion of the course marked “A.” In portions “A,” “B,” “C” and “D, the procedure shall be the same as described in preceding para- graphs, except that the truc
20、k shall place a test load at each point where it was pre- viously indicated that the truck picked one up, and pick up a load where it was pre- viously indicated one was placed. Maneuvers in the balance of the course beyond the por- tion marked “D,” shall be the same as de- scribed in preceding parag
21、raphs. One half of the total number of circuits shall be traversed in the oppostite direction with all operations reversed accordingly. This may be accomplished after completion of each 8 hour operating day or multiple thereof. That is, 50% of the circuits shall be accomplished in the clockwise dire
22、ction and 50 % in the counter-clockwise direction or vice versa. The test cour shall be measured at the end of each oper- ating day of the endurance test. This check shall be performed in accordance with pro- cedures outlined in Test Form No. 2. 5.2.2.6 Operating limitatians. The truck un- der test
23、shall not be permitted to leave the bounds circumscribed in Drawing C, nor shall the procedure requirements specified herein be altered. 5.2.2.7 Failure durhg endurance testing. During the endurance testing, minor ad- justments or repairs will. be permitted at the discretion of the test officer prov
24、ided they are not repetitive in nature. Minor breakdowns which are repetitive; and ma- jor breakdowns shall be cause for rejection of the truck. 5.3 Post-test. The post-test shall be con- ducted after completion of the endurance test; or if the truck fails the enzurance test, the inspection portion
25、of this procedure shall be conducted after such failure. The post-test consist of 2 parts. A. Pst-test inspection tests B. Post-test inspection 5.3.1 Post-tesi inspection tests. These tests shall be performed in accordance with the applicable procedures provided in the test forms. The truck should b
26、e given the main- tenance service and inspection in accordance with the applicable Maintenance Service In- spection sheet. Each of the questions con- tained in the Post-Test Inspection Test Check Sheet shall be answered by placing an “X” in the column headed “Yes” or “NO,” as appropriate. After comp
27、letion of the Post-Test Inspection Test Check Sheet, any “X” in the “No” column will be cause for rejection of the truck under test. 5.3.2 Post-test inspection. The truck shall be examined and applicable notations sfiall be made in the Post-Test Inspection Form. 5.3.3 Commutator damage: Electric Tru
28、cks. During the course of the post-test inspec- tion, drive motor(s) shall be examined for excessive pitting of commutator bars. Evi- dence of such shall be cause for rejection, subject to correction of the vehicle under test. A report of the findings of this exami- nation shall be made a part of th
29、e official test report. PRE-TEST INSPECTION CHECK LIST Description of truck Truck Mfr. Date Model Test Location Serial No. , Recorded by . 1. Are all required certificates of compliance furnished? YES NO 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
30、,-,-MIL-STD-2bC NOTICE 3 37 = 74777LL 00b723b 5 MIL-STD-268C 17 July 193 2. Refer to the Underwriters Laboratories Publication “Standards for Safety for Power Operated Industrial Trucks and “Standards for Safety for Internal Com- bustion Engine-Powered Industrial Trucks” (UL583 and UL 558) a. Does t
31、he gasoline or diesel truck comply with the applicable safety requirements specified in the UL Publication 558? b. Does the Type E electric truck comply with the applicable safety requirements specified in UL Publication 583 ? c. Does the Type EE electric truck comply with the applicable safety requ
32、irements specified in UL Publication 583 ? YES NO YES NO. . YES NO . Note. Where there is conflict between the Underwriters Laboratories safety requirements and the speci- fication requirements referenced in the contract, the specification requirements shall govern. 3. The following items shall be e
33、xamined to verify com- piiance with applicable requirements of the equip- ments specifications. Indicate results under appro- priate column. A GASOLINE AND DIESEL TRUCKS A-1 Engine A-2 Engine Accessories Choke control Ignition system Cables and wires Distributor ignition coil Generator Generator reg
34、ulator Starting system Fuel system Fuel tank Fuel lines Fuel pump Carburetor Air cleaner Cooling system Drains and drain cocks Fan Water pump Thermostat Radiator Governor 7 No Remarks Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Yea No Provided by
35、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-268C NOTICE 3 37 W 7777711 0067238 7 W MIL-STD-268C 17 July 1963 A-6 Parking brake Hand lever (when used) Linkages Adjustment Truck body Seat Engine enclosure Instrument panel Fenders and running boards To
36、wing hook Lifting attachments Cab and cab heater (when required) A-6 Controls and instrumentation Protection against weather Position markings Distance between knobs and Light switch Ignition switch Starting motor switch Brake pedal Accelerator Directional speed control Lift and tilt control Instrum
37、ents Ammeter Oil pressure gage Temperature gage Hour meter Fuel gage Over temperature signal (when required) adjacent surfaces A-7 Accessories Spotlight Stoplight Battery Mounting Terminals Horn Overhead safety guard Fi= extinguisher (when required) A-8 Other requirements Bearings Lubrication Access
38、ibility Drain plugs Grease fittings Treatment and painting Radio Interference suppression Nameplate Repair and maintenance replacement of parts Adjustment, accessibility - Yea No, Remarks Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-268 C
39、17 July 1963 Access openings Technical manuals Workmanship Finish and appearance Rivet connections Welds Bolt connections Castings B ELECTRIC TRUCKS B-1 Electrical equipment Wiring Resistors Insulation Enclosures and shields Overcurrent devices Resistor housings Thermal relays Static discharge devic
40、e Control panel Motors Traction motor Hydraulic pump motor Thermal relays Speed controller B-2 Battery (when furnished) Volts Amperes Battery leads Battery connectors Battery compartment Length Width Height B-3 Transmission and drive assembly Drive gears Shafts Axles Lubrication B4 Hydraulic system
41、Hydraulic pump Sump (storage) tank Hydraulic lines Breather and filler cap Fiston rods B-5 Structure Chassis and frame Frame members Bracing8 Joints No Remarks Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-No MIL-STD-268C 17 July 1965 - _- -. ._ -
42、Remarks Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-YeS MIL-STD-ZhC NOTICE 3 37 m 77777Li 00b724L 7 m MIL-STD-268C Treatment and painting Radio interference suppression Nameplate Repair and maintenance Adjustment, accessibility - replacement of p
43、arts Access opening Technical manuals Workmanship Finish and appearance Rivet connections Welds Bolt connections Castings _- ” . - - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-268C i7July 1963 TEST FORM NO. 1 MAXIMUM LIFT-FREE LIFT WEIGH
44、T- COLLAPSED MAST HEIGHT-DRIFT Purpose : To determine whether the truck has the required maximum lift, free lift height and collapsed mast height and whether the hydraulic system can hold the rated load without drifting more than specified. Test Description : Place the truck carrying the specified r
45、ated test load on a flat level surface with the mast in true vertical posi- tion and with forks fully lowered. Center of mass of test load shall be on the longi- tudinal centerline of truck and at rated load uenter. 3. Measure the true vertical distance from floor to the top surface of the forks at
46、24 inches load center. (This is the fyee lift height.) 4. Raise test load to the highest obtainable position, and measure the true vertical distance from floor to the top surface of the forks at the 24 inch load center. (This is maximum lift height.) 5. Complete data form. Test Procedure: 1. Measure
47、 the true vertical distance from floor to uppermost projection of the up- right assembly. (This is the actua1 col- lapsed mast height.) 2. Raise load until the inner mast begins to exceed the specified collapsed mast height. The following procedure shall be conducted as part of the pretests and repe
48、ated during post tests. 6. Raise rated load to maximum lift height; mark reference point on mast. Hold for 5 minutes and measure downward drift. 7. Indicate results on data form and -n post test inspection test check sheet. Data Form: - Description of truck . Truck Mfr. Date . Model Test Location .
49、Serial No. Recorded by . Indicate whether desired results were obtained Yes No Collapsed mast height Free lift height Maximum lift - Bo-wnward drift 13 ,/- - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I _- _- 0069243 2 W TEST FORM NO. 2 LIFTING SPEED, LOWERING SPEED, SHOCK TEST Pu
