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sexton

CVRT throttle lock - stupid idea?

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We have a few CVRTs at our museum. It has always struck me that the wing nut on the throttle linkage to lock the throttle open on cold starts etc. is a very bad idea. Unlike any other manual throttle control I have seen, it doesn't just raise the idle speed while still allowing normal throttle control, eg Jeep or Ferret, it completely locks the linkage. Seems like that is asking for trouble. I'm thinking of say someone using the lock, then just barely backing it off, then someone nudging the wing nut with a knee or whatever while driving and locking up the throttle. 

I understand that if the nut is backed off completely, that is unlikely to happen, but it concerns me enough, I think I will suggest that we get rid of the lock. Anyone else considered this or come up with a foolproof way to prevent this happening?

Malcolm

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I think if it hasn’t caused enough issues to be replaced with something else in 40+ years of service then it’s probably not a problem?

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Malcolm,

I wholeheartedly support your initial comments, as I thought the same.

However, I also agree with Chris, and once you know what the wingnut does you get accustomed to it, so ensure it is taught to all drivers.

I would honestly say that I would be more inclined to put a warning sign near or on the brake reservoirs warning about the use of brake fluid vs the specified fluid before I did anything with that wingnut, because once the wrong fluid has been introduced it is hard to recover without a ton of work and many vehicle operators think they are doing good by doing a first parade themselves without a check of what fluid is to be used.

Seen it 3 times now, I just shake my head.

 

 

 

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I hear you on the brake fluid problem, Robin. But that's a potential mechanical damage issue. That throttle lock on the CVRT is a safety hazard. We have a lot of people here who want to drive and we have a training program for each vehicle but I worked in the nuclear power industry and we had it beaten into us that training is important but it CAN'T be relied upon to prevent mistakes. People mess up, get tired, careless, forget. Design is the way to minimize risk. Make it so people can't get it wrong. So remove the locknut. 

I'll go out on a limb and say that in the last 40 years, I'll bet this design has scared the shit out of someone. 

As you know, we end up with a few hundred of the public at our shows and about 20 volunteers driving, guiding, crewing, etc. We just have to be doing the nuclear thing and asking "what if?".

Malcolm

 

 

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storm in a tea cup. its there to hold the engine rpm up to ensure charging during radio watch. Bin it and put on a nyloc!

Terry

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6 hours ago, sexton said:

I hear you on the brake fluid problem, Robin. But that's a potential mechanical damage issue. That throttle lock on the CVRT is a safety hazard. We have a lot of people here who want to drive and we have a training program for each vehicle but I worked in the nuclear power industry and we had it beaten into us that training is important but it CAN'T be relied upon to prevent mistakes. People mess up, get tired, careless, forget. Design is the way to minimize risk. Make it so people can't get it wrong. So remove the locknut. 

I'll go out on a limb and say that in the last 40 years, I'll bet this design has scared the shit out of someone. 

As you know, we end up with a few hundred of the public at our shows and about 20 volunteers driving, guiding, crewing, etc. We just have to be doing the nuclear thing and asking "what if?".

Malcolm

 

 

Malcolm,

The brake fluid issue of not using the correct mineral based fluid is not just a mechanical damage one, but a safety issue primarily as it can effect main or steering brakes, so should be treated with utmost importance. I was involved in repairs to these vehicles for a good many years for the British Army, so well aware of the consequences.

Also, never known of an issue with the throttle wing nut. If there had been any reported occurrences, an Instruction would have been issued.

 

 

 

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Thanks for the comments, guys. The consensus here seems to be building to remove the wing nuts. 

Malcolm

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The wingnut is essential if the engine is started from a cold start, charging a battery or using the boiling vessel to boil, or warm water.

The habit is to make sure it's backed off.

Diana

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