. OPERATION OPERATION BRAKE PERFORMANCE CURVE 3 - 109 HD465-7 Method of using Examp le: Down hill distance: l resistance: - 11% [grade resistanc e: -13%, rolling resistanc e: 2% 55 tons Obtain the maximu m permissibl e speed and the trans mission speed range fro m the graph when traveling d ownhill under the above c ondition 1. Use th e brake performance graph for the downhill distance of 1500 m (492 1 ft). 2. Startin g from p oint (A) which corresponds to the ov erall weight of the machi ne, draw a perpendicular lin e down. 3. Take the point where it crosses the line for travel r esistance -11% as (B) a nd draw a horizonta l line. 4.
Take the point where i t crosses the performance curve as (C), and draw a perpendicular line down. T ake t he point where thi s line cr osses the travel speed scal 5. As a r esult of t he abov e, the following items chan The m aximum permitte d speed changes from poi nt (D) to 29.5 km/h (18.3 MPH The s peed ran ge changes fr This maximum per missible spee d is one guideline dete rmined from the retarder brak e performance, so on a n actual jobsite, de termine a safe tr avel s peed below the maxim um permissible speed to match the conditions of the jobsite so that th e retarde r brake oil temperature gauge is alw ays in the white range w hen traveling.