AS ISO 5353:2020 pdf free.Earth-moving machinery, and tractors and machinery for agriculture and forestry – Seat index point.
5 Technical requirements 5.1 Device for seat index point (SIP) determination The device for determining the SIP shall comply with figure 1. The mass of the device shall be 6 kg ± 1 kg. The work surfaces of the device shall be of hardwood (sanded with 200 or finer grit paper or equivalent and polished) or equivalent material with the same performance to provide minimum friction with the muslin cloth in 5.3.1. 5.2 Adjustments when determining the seat index point (SIP) When the relevant adjustments are a part of the seat and its suspension, the seat shall be adjusted according to the following sequential steps before determining the SIP. 5.2.1 Seat adjustment All fore, aft, vertical and angular adjustments shall be placed in their centre position. When no centre position is possible, the nearest adjustment that will move the SIP device upward or rearward of centre shall be used. 5.2.2 Suspension system Block the suspension system according to the manufacturer’s instruction. If such instruction is not provided, block the suspension system at the midpoint of its oscillation range. Non-adjustable suspension shall be blocked in the vertical position attained with the weighted device in place. 5.3 Seat index point (SIP) determination The SIP shall be determined by using the device illustrated in figure 1 and applying the following procedures. 5.3.1 Seat preparation Allow sufficient time to ensure that the seat reaches a room temperature of 20 °C ± 2 °C before starting the measurement procedure. Place the seat on a level surface. Seat a 75 kg ± 10 kg person in the seat twice for 1 mm periods to flex the seat and back cushions. Allow the seat to remain unloaded for a minimum period of 5 mm before starting the measurement procedure. Cover the seat with a single layer of muslin cloth of sufficient size to prevent direct contact and minimize friction between the cushion surfaces and the measurement device. Take care to prevent the cloth from influencing the positioning of the device. AS ISO 5353 pdf download.