This is the week before last when I failed to post pictures of the 10 wheel end disassemble assignments.

This week I completed an assignment on control modulating valves. I choose to study the one on the freightliner in our shop. I found the valve, found the part number (550414), found the service information and dissembled it.  

 I had a hard time with one of the screws, I was proud of how mangled it was when i got that sucker out.

a control modulating valve applies the spring brakes gradually, so you can control the spring brakes if the service brakes fail. 

 

This is the break canister I took apart last week, as explained in previous blog.

This week I learned how to use a plasma cutter. I also learned how to disassemble an air break canister  easily.  I successfully trouble shot an air brake failure. I learned how to find the possible leak points in the schematic and how to pin point the issue. I also have disassembled a control modulating valve for ABS but that post is for tomorrow and I will also take that opportunity to post the pictures I have taken in class throughout the week.

Hours this week:26

Hours last week: 24

Hours total: 164

This week I learned how do disassemble, inspect hand reassemble air breaks on truck trailer drive and steering hubs. After following the recommended Wheel bearing adjustment 618. Here is a video of me using the dial indicator to test the free play to make sure it is to specification.

Last week I learned what cavitation is like and the symptoms it produces. I also learned how debilitating a leak in a hydraulic system can be over time. This week I did a lot of my own research because I felt like I needed to know more on breaks before I felt comfortable enough to disassemble and inspect them. I read good portions of the references I was given by Jeff, which helped much. I understand the mechanics of it now… those break-apart diagrams I was seeing in class didn’t make any sense to me at the time, now I can identify the parts and functions easily. I also spent some time finding a couple of heavy-duty break jobs to do outside of school (haven’t done them yet)…. Too bad my camera died I will have pictures before the end of next week. I haven’t yet flushed the hydraulic fluid in the Kubota because I haven’t gotten the proper fasteners to fix those damned leaks.

Time this week: 25

Time total: 114