Hayter 56 throttle control springs

[timo]

Hi..sorry to ask.. first post!.. I have inherited a Hayter 56 mower with Briggs and Stratton which has been brilliant, but the throttle control doesnt work, only runs at one speed.

I dismantled and cleaned the mower today and its really helped..lots of loose/ missing bolts, etc.. but I cant work out what is meant to happen with the springs, are there meant to be 2? I have looked everywhere on google but none of the engines seem to match the throttle layout I have? I have replaced the govenor spring with a new one but that didnt help. The throttle control at the front of the mower moves, but this doesnt move the throttle control at the end of the govenor spring, should there be a second spring? I can manually move the second control and this alters the rev, so no valve issues (?), but not sure what is mean to move the control?

I've attached some photos so I hope that help? Many thanks and apologies if Im too vague... its an old machine so no silver plate with serial nos, etc.. and clearly no expert!.. thanks

tim

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[Terry Coombs]

Most governers work by the spring pulling on the internal governer mechanism , which is then connected to the throttle shaft by a solid link . It amounts to a balancing act between the external spring tension and the forces generated by the internal mechanism - that is , the more spring tension applied the faster the motor must turn for the internal mechanism to overcome the higher spring tension . Hope this helps you .

[timo]

Thats great thanks. The solid link bar is there and I've installed a new govenor spring but I just dont know if what I have is missing a spring or is damaged in anyway? Was hoping to find an image or some advice about how it should look. Many thanks for the reply.

Tim

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[~misfit~]

I don't know what the problem is. Mower engines are supposed to run at a set rpm, where they and the blade system is most efficient. The governor is there to open the throttle more if the revs drop (due to load, long grass etc.) so as to keep the engine at the optimum speed. If you want to vary the engine speed (pointless on a mower) then you need to disable the governor.

The 'throttle control' is only there to stop the engine when you're done. Some mowers can be set to idle but there's really no point - you either want the thing running (and working) or not. On or off.

I know of instances where it has been decided that the mower runs too fast as they grass is only short so they've been slowed down by modifications. Usually the engines don't last long as they're designed as a single-speed unit and running them at lower speeds means insufficient cooling from the engine-driven fan / inadequate oiling / non-clean fuel burning and out-of-spec forces on critical components when the load does vary.

[timo]

Thanks Shaun. Luckily I can still use the mower to cut the lawn, but as you say, having the ability to control the speed would help due to the different grass lengths, etc. Just wish I knew how the spring setup should be... thanks again

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