Geekzone: technology news, blogs, forums
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.

Filter this topic showing only the reply marked as answer View this topic in a long page with up to 500 replies per page Create new topic
1 | 2 | 3 

948 posts

Ultimate Geek
+1 received by user: 508

  Reply # 2185983 23-Feb-2019 17:55
Send private message quote this post

The blade tips must be able to extend straight out as the blade rotates. If one is stuck folded that would easily explain the vibration.

9/16" is 14.3mm so a 14mm socket will be a snug fit. The bolt is 3/8 UNF not metric.

I usually jam the blade with a piece of wood.


I finally managed to remove the blade. The bolt was a left hand thread.


No, just kidding :-). Conventional RH thread.


The tips don't rotate very freely. I guess they rely on centrifugal force to keep them in line with the blade-holder, but they still seem pretty rigid to me.


Anyway, I CRC'd them and then added ordinary oil. They're held on by locknuts so they can't be over-lubed.


I didn't run the mower without the blade in case, as you pointed out, the weight is needed as a flywheel.


But I will return it to M10, I still think the vibration is excessive.

15594 posts

Uber Geek
+1 received by user: 3040


  Reply # 2186000 23-Feb-2019 18:31
Send private message quote this post



Bung: So we all have all the details.

What is the model of mower and what type of blade is it?

If it is a blade holder with swinging blade tips it is possible that one tip is stuck not fully extended, that will unbalance the mower. A fixed blade would need obvious damage to unbalance it after just 10 mins running.

The mower probably wouldn't run well without a blade as it could act as part of the flywheel.

If it is a Briggs & Stratton engine the bolt will be a normal 3/8 x 11/4" UNF not lh thread.


Okay, the machine is branded on the (red) shroud 'Vinaro 350ST'. There's a plastic plaque on the front labeled 'MORRISON'


The engine is a B&S 500E, 140 CC OHV. Made in USA.


I took a look at the blade, and yes, it has add-on tips.


You say 'swinging' blade tips - does that mean these bits should be rotating freely? Because they don't. One is pretty much locked in place, the other moves if I twist it.


Incidentally, the bolt head exactly fits a 14mm socket. I tried again to undo it as I would a conventional rh thread , but it wouldn't move. 


Shame these things don't have a locking button like most skilsaws.


I'll find a way tomorrow :-)



The tips move. Being tight is normal. if you had a fixed blade and you hot a solid object, bye bye crankshaft. The tips will fold back, centrifugal force will put that back into place. If you don't regularly mow bricks :-) they will get tight


896 posts

Ultimate Geek
+1 received by user: 551

  Reply # 2186262 24-Feb-2019 12:37
Send private message quote this post

Are the tips in good condition? If they are a dis-similar weight due to wear and/or damage that will cause vibration (that is one reason they need to be periodically replaced). Also, if someone has fitted the tips with different length bolts, numbers of washers or otherwise messed up the left to right weight balance, that will cause vibration. You can test-run the mower without the tips fitted to narrow the cause of the vibration down. 


If one tip gets stuck folded in, the imbalance shakes the mower quite violently - "excessive" would be a conservative description.

1 | 2 | 3 
Filter this topic showing only the reply marked as answer View this topic in a long page with up to 500 replies per page Create new topic

Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:

Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:

Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:

News »

Orcon announces new always-on internet service for Small Business
Posted 18-Apr-2019 10:19

Spark Sport prices for Rugby World Cup 2019 announced
Posted 16-Apr-2019 07:58

2degrees launches new unlimited mobile plan
Posted 15-Apr-2019 09:35

Redgate brings together major industry speakers for SQL in the City Summits
Posted 13-Apr-2019 12:35

Exported honey authenticated on Blockchain
Posted 10-Apr-2019 21:19

HPE and Nutanix partner to deliver hybrid cloud as a service
Posted 10-Apr-2019 21:12

Southern Cross and ASN sign contract for Southern Cross NEXT
Posted 10-Apr-2019 21:09

Data security top New Zealand consumer priority when choosing a bank
Posted 10-Apr-2019 21:07

Samsung announces first 8K screens to hit New Zealand
Posted 10-Apr-2019 21:03

New cyber-protection and insurance product for businesses launched in APAC
Posted 10-Apr-2019 20:59

Kiwis ensure streaming is never interrupted by opting for uncapped broadband plans
Posted 7-Apr-2019 09:05

DHL Express introduces new MyDHL+ online portal to make shipping easier
Posted 7-Apr-2019 08:51

RackWare hybrid cloud platform removes barriers to enterprise cloud adoption
Posted 7-Apr-2019 08:50

Top partner named at MYOB High Achievers Awards
Posted 7-Apr-2019 08:48

Great ideas start in Gisborne with hackathon event back for another round
Posted 7-Apr-2019 08:42

Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.