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UL 558-2020 pdf free download
UL 558-2020 pdf free download.Industrial Trucks . Internal Combustion Engine-PoWered.
23.1.5 A truck designed for operation on a level surface and marked in accordance with is to be tested on a level test course.
23.1.6 The temperature of the ambient air is not to be less than 10C (50SF) nor more than 40t (1O4F).
23.1.7 Operating temperatures measured at any one time are to be related to the ambient temperature of the air at the same time and location.
23.1.8 Trucks employing water jacketed components to limit surface temperature as required by Temperature Limitations, Section j, shall be tested with the components filled to various levels from empty to completely filled. If a temperature cutoff is employed, it shall be connected for this test.
23.2 Fork and platform trucks
23.2.1 The test course is to be 200 feet (61 m) long, The truck is to be operated over this course while hauling its full rated load. At the end of the course, the truck is to be turned at right angles, the load raised to full height, and then lowered to the hauling position. The truck is then to be returned to the starting point. where the load is again to be raised and lowered and deposited at right angles to the test course. The truck is then to be operated over the same course with no load and, at the end of the course, the forks (or platform) are to be raised to full height and lowered. The truck is then to be returned to the starting position, and the load picked up. These runs are then to be repeated, alternating between loaded and unloaded trips. The vehicle is to travel at the maximum safe practical speed.
23.3 Load-carrying trucks
23.3.1 The test course is to be any convenient length over 200 feet (61 m). If the length exceeds 300 feet (91 m), the truck is to be stopped and started at intervals of approximately 200 feet. It is to be negotiated not less than six times per hour. The truck is to carry its rated load. The test is to be conducted in such a manner that the truck Es in motion approximately 80 percent of the time.
23.3.2 Two loads are to be provided for a tractor, consisting of two trains of trailers or trailing vehicles. One of the trains is to be loaded to such capacity as to require a draw-bar pull of the tractor. The other train is to consist of empty trailers equal in number to the loaded train. The tractor is to be operated over the test course pulling the loaded train of trailers and returning to the starting point, at which point the loaded train is to be uncoupled. The empty train is then to be coupled to the tractor and pulled over the same course. This cycle is to be repeated, alternating between loaded and unloaded trailers, allowing time at the starting point for normal coupling and uncoupling operations. If the length of the test course exceeds 300 feet (91 m), the truck is to be stopped and started at intervals of approximately 200 feet (61 m). The test course is to be negotiated not less than 6 times per hour.
23.3.3 Immediately after taking the final temperature readings. the tractor is to be operated for an additional 1 minute against a bumping post or other obstruction.UL 558-2020 pdf free download.
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