What I do at work. Bus in bits content.
“The tyre is strapped but what stops the axle rotating?”
The brakes are on. The handbrake/parking brake on an air braked vehicle uses a spring at each wheel to apply the brake and air pressure to release it. Once the pipes are disconnected, the brake is automatically locked on.
“…they are both very dull.”
Buses are dull, engineering is interesting.Posted 6 years ago
I’ve been looking through some old Meccano magazines this morning, reading about a 6000 ton press used to make railway wagon wheels. I find that sort of thing fascinating.
I enjoy the mental and physical challenge of taking something apart, repairing it and putting it all back together again, especially if it involves jacks, cranes and hydraulic lifts.
I thought some of the STW IT managers might be interested in what goes on in the world of engineering.
Taking the axle out of a bus.
The big lump on the diff is the retarder.
The ratchet strap round the tyre is to stop the weight of the retarder rotating the whole lot downwards.
The reason for removing it.
The axle had cracked around the spring mountings and was leaking oil.Posted 6 years ago
That’s the underside there, I’ve rolled it over and started grinding the crack out ready to weld it.jackthedogMember
Opinions are subjective
The brakes are on.
So does that mean if an air braked vehicle loses pressure the brakes default to on? Or is that just for the parking brake?
I’ve seen bus drivers get a warning bong from the dash and start revving the engine at lights to make it stop. I always assumed this was something to do with building up air pressure – is that so?Posted 6 years ago
“Opinions are subjective… and you enjoy orienteering”
It’s the combination of physical and mental challenge again. Some people like chess, some people like time trialling, some like a sport that’s got a bit of each.
“…it looks more like a job for a mechanic than an engineer”
My parking space at work. 😛
jackthedog, yes to all three questions.
The foot brake uses air pressure to apply the brakes.
The biggest difference between air and hydraulic brakes is that in a hydraulic system, the lever or pedal is a pump. Push it harder and it applies more pressure at the wheel.
An air brake pedal is a tap. The compressor creates the pressure, the “tap” allows that pressure through to the wheels.
The parking brake is a fail safe system, it uses air pressure to release the brakes.Posted 6 years ago
In slow moving traffic where the brakes, doors, gear shift and suspension are constantly using air, the compressor may not keep up at low engine speeds.
The bus industry seems to use some archaic language.
Coming in to buses from haulage, what I think of as the Traffic Office, is called Despatch.
The room with the pool table where the drivers hang around between duties is called the Guard Room.
When I worked at a Mercedes commercial vehicle dealer, we were called Technicians. MAN and Iveco called us Mechanics.Posted 6 years ago
I’ve just got in the habit of using the term engineer as that’s what we’re called and that’s how I answer the phone to let people know they are through to the workshop, not Despatch.Posted 6 years ago
I’m certainly not claiming to be something I’m not.
After all, Engineers only design stuff on paper. Mechanics keep it working in the real world. 😉deserterMember
all the places I have worked I was never called an engineer, it was mechanic or technician.
buses are the worst thing to work on after cars, I’m a truck mechanic by trade but now I fix diggers which is much more interesting than anything else I have worked on
I actually got some action shots a couple of months ago I’ll see if I can find themPosted 6 years ago
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