Automatic chains have proven themselves many times over in our fleet operation. With the flick of a switch they automatically apply themselves against the inner dual tire sidewall which rotates the chain wheel to throw the chains under the tire tread. The company that manufactures these auto chains is called ‘Onspot of North America’. They… Continue reading School Bus Auto Chains
Twenty years ago the suspension on a school bus was solid leaf springs which worked well but since the introduction of air bag suspension the ride has greatly improved. The rear suspension on the bus in the video is manufactured by Hendrickson International who have been in the suspension business for many decades. I can… Continue reading School Bus Hendrickson Suspension
The parked regeneration is a regular procedure for diesel engines that get to the point where passive regens are not keeping the DPF (diesel particulate filter) clean. The differential pressure sensors will signal the motor control module MCM to alert the driver with an amber light on the dash that a parked regen is required.… Continue reading Diesel Engine Regen
The road test is one of the most important steps to take when troubleshooting a mechanical problem on any vehicle. Thousands of mechanics will agree with this statement. When you listen to a complaint from the driver of the vehicle in question you may not get the whole story. I like to find out as… Continue reading Mechanic Road Test and Service Call Tips
I haven’t said anything about our onsite body shop so I think now is the time to tell you all about it. We have a journeyman body man who does everything related to school buses. He replaces and repairs body panels, repairs and replaces seat covers, replaces damaged and fogged glass and paints where required… Continue reading School Bus Body Shop
Air brake abs or antilock brake systems are similar to automotive in principle with wheel sensors, tone wheels and a control module. The difference of course is air brakes compared to hydraulic brakes. On our newer school buses there is an off road switch on the dash to engage the ABS and reduce wheel spin. The results using this system during winter… Continue reading Air Brakes System with ABS
This is another Mercedes diesel engine MBE 900 post. These engines are keeping us busy. Just when we get one code repaired another one comes along. Tonight while working on the engine in this video one of the drivers walked in to the shop and reported an engine code on his dash. It’s another MBE 900 that… Continue reading Mercedes Diesel Engine Code 2631
The Cummins ISB diesel engine is the most reliable diesel engine in the fleet. However they are not invincible and can act up once in a while. The operator came in and told us there was an amber light on the dash. Most descriptions of the issue are pretty good but it is a habit… Continue reading Cummins ISB Diesel Engine Code Repair
In 2008 we purchased an International CE school bus with a MaxxForce 7 diesel engine. It also was a hybrid that operated up to 50km per hour. The idea was to assist the launch out of the gate then going full diesel after the 50km per hour speed was met. It worked fine for a… Continue reading MaxxForce 7 Diesel Engine Low Power
The pre trip on a school bus is one of the most important steps of the day for the operator. At this stage the bus is sitting in the garage yard and the driver checks everything head to toe to determine if the bus is safe to use. Once they know the bus is safe… Continue reading School Bus Automated Light System
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