['Heavy Equipment and Vehicles']
['Heavy Equipment and Vehicles']
06/20/2022
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(a) General. This section sets forth requirements for frames used to protect operators of wheel-type agricultural and industrial tractors used in construction work that will minimize the possibility of operator injury resulting from accidental upsets during normal operation. See paragraph (e) of this section for definitions of agricultural and industrial tractors.
(b) Equipment manufactured before July 15, 2019. For equipment manufactured before July 15, 2019, the protective frames shall meet the test and performance requirements of the Society of Automotive Engineers Standard J334a, Protective Frame Test Procedures and Performance Requirements and J168, Protective enclosures-test procedures and performance requirements, as applicable (incorporated by reference, see §1926.6), or comply with the consensus standard (ISO 5700:2013) listed in paragraph (c) of this section.
(c) Equipment manufactured on or after July 15, 2019. For equipment manufactured on or after July 15, 2019, the protective frames shall meet the test and performance requirements of the International Organization for Standardization (ISO) standard ISO 5700:2013, Tractors for agriculture and forestry—Roll-over protective structures—static test method and acceptance conditions or ISO 3471:2008 Earth-Moving Machinery—Roll-over protective structures—Laboratory tests and performance requirements (incorporated by reference, see §1926.6).
(2) A laboratory test may be either static or dynamic. The laboratory test must be under conditions of repeatable and controlled loading to permit analysis of the protective frame.
(3) A field-upset test, when used, shall be conducted under reasonably controlled conditions, both rearward and sideways to verify the effectiveness of the protective frame under actual dynamic conditions.
(d) Overhead protection requirements. For overhead protection requirements, see §1926.1003.
(e) Definitions applicable to this section. (1) Agricultural tractor means a wheel-type vehicle of more than 20 engine horsepower, used in construction work, that is designed to furnish the power to pull, propel, or drive implements. (SAE standard J333a-1970 (‘‘Operator protection for wheel-type agricultural and industrial tractors’’) defines agricultural tractor as a ‘‘wheel-type vehicle of more than 20 engine horsepower designed to furnish the power to pull, carry, propel, or drive implements that are designed for agricultural usage.’’ Since this part 1926 applies only to construction work, the SAE definition of agricultural tractor is adopted for purposes of this subpart.)
(2) Industrial tractor means that class of wheel-type tractors of more than 20 engine horsepower (other than rubber-tired loaders and dozers described in 29 CFR 1926.1001), used in operations such as landscaping, construction services, loading, digging, grounds keeping, and highway maintenance.
(3) The following symbols, terms, and explanations apply to this section:
Eis = Energy input to be absorbed during side loading in ft-lb (E’ is in J [joules]);
Eis = 723 0.4 W ft-lb (E’ is = 100 0.12 W’, J);
Eir = Energy input to be absorbed during rear loading in ft-lb (E’ ir in J);
Eir = 0.47 W ft-lb (E’ ir = 0.14 W ’, J);
W = Tractor weight as specified by 29 CFR 1926.1002(e)(1) and (e)(3), in lb (W ’, kg);
L = Static load, lb (kg);
D = Deflection under L, in. (mm);
L-D = Static load-deflection diagram;
L m -D m = Modified static load-deflection diagram (Figure W-20). To account for an increase in strength due to an increase in strain rate, raise L in the plastic range L x K;
K = Increase in yield strength induced by higher rate of loading (1.3 for hot, rolled, lowcarbon steel 1010-1030). Low carbon is preferable; however, when higher carbon or other material is used, K must be determined in the laboratory. Refer to Norris, C.H., Hansen, R.J., Holley, M.J., Biggs, J.M., Namyet, S., and Minami, J.V., Structural Design for Dynamic Loads, McGraw-Hill, New York, 1959, p. 3;
L max = Maximum observed static load;
Load Limit = Point on a continuous L-D curve at which the observed static load is 0.8 L max (refer to Figure W-19);
E u = Strain energy absorbed by the frame, ft-lb (J); area under the Lm-Dm curve;
FER = Factor of energy ratio, FER = E u E is; also, FER = E u E ir;
P b = Maximum observed force in mounting connection under a static load, L, lb (kg);
P u = Ultimate force capacity of mounting connection, lb (kg);
FSB = Design margin for a mounting connection ( P u P b)-1; and
H = Vertical height of lift of 4,410-lb (2,000-kg) weight, in. (H ’, mm). The weight shall be pulled back so that the height of its center of gravity above the point of impact is defined as follows: H = 4.92 0.00190 W (H ’ = 125 0.107 W ’) (see Figure W-24).
[84 FR 21578, May 14, 2019]
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