Lawnmower Help
Discussion
I moved house last year and went from having no garden to a nice big garden, at the time budgets were tight so I ended up buying a 2nd hand lawnmower.
The lawnmower was being sold as running however the throttle lever didn't do anything, as you can see from one of the pictures the previous over had put some tape on one of the levers, but this is not stuck to anything at the moment so not doing anything.
It served its purpose last year and I have mowed the lawn a couple of times this year, however I really want to try and fix the throttle lever.
I have had a look and the lever on the handle is attached to a cable. When you move the lever you can see the cable moving, however at the business end nothing happens.
I have attached pictures of the lever on the handle along with the levers on the engine, if you manually move the levers on the engine then the engine will start increase in power, at the moment it just seems to be at one constant speed.
How can I fix this so that the lever on the handle allows me to increase or decrease the engine speed?
Sorry if its not ben explained very well.
The lawnmower is an Oleo Mac with Emac K800 engine.
The lawnmower was being sold as running however the throttle lever didn't do anything, as you can see from one of the pictures the previous over had put some tape on one of the levers, but this is not stuck to anything at the moment so not doing anything.
It served its purpose last year and I have mowed the lawn a couple of times this year, however I really want to try and fix the throttle lever.
I have had a look and the lever on the handle is attached to a cable. When you move the lever you can see the cable moving, however at the business end nothing happens.
I have attached pictures of the lever on the handle along with the levers on the engine, if you manually move the levers on the engine then the engine will start increase in power, at the moment it just seems to be at one constant speed.
How can I fix this so that the lever on the handle allows me to increase or decrease the engine speed?
Sorry if its not ben explained very well.
The lawnmower is an Oleo Mac with Emac K800 engine.
Andrew_S said:
Is that piece of mesh stopping the lever from moving when you pull on the cable?
The mesh tape was originally to hold the lever in wide open position however its not longer doing anything, has been taken off since the picture was taken.When starting it i now need to jam place a piece of wood next to the lever to put it into wide open, once the lawnmower has started i remove the wood and the engine speed drops but the lawnmower runs fine on the lower engine speed.
RZ1 said:
I have attached pictures of the lever on the handle along with the levers on the engine, if you manually move the levers on the engine then the engine will start increase in power, at the moment it just seems to be at one constant speed.
How can I fix this so that the lever on the handle allows me to increase or decrease the engine speed?
Are the revs MEANT to increase?How can I fix this so that the lever on the handle allows me to increase or decrease the engine speed?
I dunno about that particular mower, but my Viking sits at constant revs, and automatically compensates for heavy load (long grass) in order to keep the engine speed static. There's a "hare/tortoise" lever, which changes the gearing to the roller, so increases/decreases the ground speed, but at the same revs. If yours is a push-along rather than motorised, then that won't apply. but I'm guessing that one of the big red/black handles is ignition and the other the drive clutch.
RZ1 said:
These guys reckon they're the sole UK source for Oleo-Mac...
http://www.mowdirect.co.uk/lawn-mowers/petrol-lawn...
http://www.mowdirect.co.uk/lawn-mowers/petrol-lawn...
Do you know what model it is?
These engines have a governor which regulates the RPM. Either controlled by a vane blown by air from the cooling fan or a sprung bob weight type inside the crankcase. The throttle lever serves as a choke when pushed forward to the symbol and as a throttle through the rest of the range.
The governor and the throttle work together, so when the load on the engine increases, the RPM drops. This allows the vane to move closer to the flywheel due to lack of airflow or the spring to pull the bobweights in. The governor then opens the throttle to bring the RPM back up. If the RPM gets too high, the vane will be pushed away by the airflow or the bob weights spin out too far, and the linkage from the governor will close the throttle.
Pushing the throttle lever puts a bias on the governor neutral position, via a spring, so the engine will be governed to a higher or lower RPM.
The governor vanes are prone to siezing on their shafts and the vane gets clogged with grass sometimes.
The governor and the throttle work together, so when the load on the engine increases, the RPM drops. This allows the vane to move closer to the flywheel due to lack of airflow or the spring to pull the bobweights in. The governor then opens the throttle to bring the RPM back up. If the RPM gets too high, the vane will be pushed away by the airflow or the bob weights spin out too far, and the linkage from the governor will close the throttle.
Pushing the throttle lever puts a bias on the governor neutral position, via a spring, so the engine will be governed to a higher or lower RPM.
The governor vanes are prone to siezing on their shafts and the vane gets clogged with grass sometimes.
Edited by GliderRider on Tuesday 24th April 21:40
It looks similar to my mower...
The Min and Max lever controls the choke. It should be max when starting from cold and then progressively reduced.
The red handle is the throttle, but basically one speed, i.e. held open - you can adjust engine speed with it, but I don't think it is designed to do so.
The black handle is the drive to the wheels or drum.
HTH
ETA : I did find this.. http://oleomac.pl/allegati/emakcatalog/K500-K800_1... seems a bit limited, but might help
The Min and Max lever controls the choke. It should be max when starting from cold and then progressively reduced.
The red handle is the throttle, but basically one speed, i.e. held open - you can adjust engine speed with it, but I don't think it is designed to do so.
The black handle is the drive to the wheels or drum.
HTH
ETA : I did find this.. http://oleomac.pl/allegati/emakcatalog/K500-K800_1... seems a bit limited, but might help
Edited by eps on Tuesday 24th April 22:32
That is a speed control for the self drive. You are right it will manually effect revs.
The top position is the choke (butterfly closed completely, you should feel it sort of click/bump into fully choke) and the rest is the throttle (butterfly opening and closing). Some mowers regulate their own speed through the vane and spring like the Briggs and Stratton classic, but even that engine has a manual carb with throttle on some self drive models.
Does the lever move the cable, and does the cable move the lever on the carb? Good soak with wd40 can help. Take the carb off and check that the lever is attached to the butterfly inside the carb.
I fixed mowers up and sold them from my back garden a few years back.
Edited to add, sorry just reread the OP, so the cable moves going into the housing at the top but not at the bottom? Broken or stuck cable in the housing, try spraying wd40 down the housing and wiggling the cable back and forth a good few times, if not it is a simple replace, just measure the length and by generic one of internet. If the cable is moving down at the bottom but the lever doesn;t move then take lever apart and derust and grease (don;t think it is this as you can move by hand) Also there is some adjustment in the cable at the business end, where the cable housing is attached near the engine there is a bolt that you can adjust the tension of the cable (they stretch) so you can try that as well.
The top position is the choke (butterfly closed completely, you should feel it sort of click/bump into fully choke) and the rest is the throttle (butterfly opening and closing). Some mowers regulate their own speed through the vane and spring like the Briggs and Stratton classic, but even that engine has a manual carb with throttle on some self drive models.
Does the lever move the cable, and does the cable move the lever on the carb? Good soak with wd40 can help. Take the carb off and check that the lever is attached to the butterfly inside the carb.
I fixed mowers up and sold them from my back garden a few years back.
Edited to add, sorry just reread the OP, so the cable moves going into the housing at the top but not at the bottom? Broken or stuck cable in the housing, try spraying wd40 down the housing and wiggling the cable back and forth a good few times, if not it is a simple replace, just measure the length and by generic one of internet. If the cable is moving down at the bottom but the lever doesn;t move then take lever apart and derust and grease (don;t think it is this as you can move by hand) Also there is some adjustment in the cable at the business end, where the cable housing is attached near the engine there is a bolt that you can adjust the tension of the cable (they stretch) so you can try that as well.
Edited by Tampon on Wednesday 25th April 07:26
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