Preventive Maintenance Intervals for Transit Buses (2010) / Chapter Skim
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30 INTRODUCTION Three case studies were selected from the survey results to provide more in-depth examples of PM programs. Personnel directly involved with these programs agreed to be interviewed by telephone.
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31 1. Service and Parking Brake 2.
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32 Since instituting its Certification Program WTA has eliminated or reduced road calls in several key areas. • Eliminated "hot wheel" road calls and malfunctions related to wheel bearing torque and adjustment procedures.
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33 Quality Assurance To make certain PM inspections are done to agency standards lead technicians also work as QA inspectors. They check three or four items at random during each PMI.
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34 network to access data that can point to a developing problem. However, instead of accessing the data at PM intervals every 6,000 miles, WMATA with its AVM system now has the benefit of obtaining critical data on a daily basis.
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35 Preventive Maintenance Benefit As stated earlier, critical defects are repaired immediately, whereas those that can wait are typically scheduled for another time or at the next scheduled PM interval. Every day each bus division receives a printout of all faults found on the fleet.
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36 its full-size bus fleet. The intervals are based on a base 6,000 mile "A" PM, where an entire vehicle inspection takes place along with an engine oil and filter change.
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37 Designation Activity Interval Bus Class Designation Codes A PM Service PM inspection Oil/filter change 6,000 mi/6 mos. 501, 599, 600, 601, 2003, 97N5, 3004, 40DO5, 40G05, 40H05, 07HB, 96ORI 990RI, 3608, 3708, 3609, 3709, 901 B PM Service A PM service Fuel filter Centrifugal oil filter 12,000 mi/12 mos.
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38 H Inspection Complete HVAC inspection Every 180 days All H1 Inspection HVAC filter replacement Every 45 days 07HB L Inspection Complete wheelchair lift inspection Every 45 days All with lift and ramps N Inspection PM cartridge (with oil separator) Every 365 days All N2 PM air drier Every 2 years All Q Inspection PM driver seat, PM destination signs Every 180 days All T Inspection CNG tank inspection Every three years All with CNG TU Inspection Engine tune-up Every 365 days All Designation Activity Interval Bus Class Designation Codes TABLE 18 (continued)
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39 crews responsible for conducting PM activities. Within each department one work crew is dedicated to inspections, whereas another is dedicated to repairing defects found during inspections.
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and other such areas. A separate "H1" inspection, which takes on certain buses every 45 days, replaces a series of HVACrelated air filters.
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