Lawn mower makes an intermittent very loud screatching noise when in
use. The start pull cord loosens slightly when this happens and there
is some vibration from around the pull cord casing.

The mower is a Briggs and Stratton Sprint 375.

Any ideas?

Thanks

Mark X wrote in


Lawn mower makes an intermittent very loud screatching noise when in
use. The start pull cord loosens slightly when this happens and there
is some vibration from around the pull cord casing.

The mower is a Briggs and Stratton Sprint 375.

I think you'll find that's the make of the engine rather than the make of
mower - perhaps a Sovereign or some such, powered by the B&S. If you have to
get spares for the mower, rather than for the engine, you'll need to
identify the make.

Any ideas?

Does it have self-propulsion? If so, it could be the drive belt - runs round
a pulley on the shaft above the blades and back to a pulley on the axle.
There's usually a belt tensioner - often at the back of the mower and
revealed when the grass box is removed - and a tightening of that may solve
the problem.

--
PeterMcC
If you feel that any of the above is incorrect,
inappropriate or offensive in any way,
please ignore it and accept my apologies.

On Fri, 02 May 2008 16:30:03 +0100, Mark X wrote:

Lawn mower makes an intermittent very loud screatching noise when in
use. The start pull cord loosens slightly when this happens and there
is some vibration from around the pull cord casing.

The mower is a Briggs and Stratton Sprint 375.

Any ideas?

Thanks

A main bearing on the crankshaft. Check the oil level first.


--
Regards, Paul Herber, Sandrila Ltd.
Electrical for Visio http://www.electrical.sandrila.co.uk/

Mark X wrote:
Lawn mower makes an intermittent very loud screatching noise when in
use. The start pull cord loosens slightly when this happens and there
is some vibration from around the pull cord casing.

The mower is a Briggs and Stratton Sprint 375.

Any ideas?

Very common - The pull start clutch shaft needs lubrication.
Take the pull start cover off.
Pry the metal cap off the clutch - now remove the ball bearings.
Now remove the square drive - lubricate the shaft with a small amount of
grease. Not too much or it will run down onto the balls and they won't work
as a clutch.
Reassemble and make sure the square drive only turns in one direction.
They can size to the shaft and alas it is part of the crankshaft, in which
case I would take it to the dealer. BTW I've fixed lots of sized ones - you
don't really need a new crank shaft!

Slatts

Sla#s wrote:
Mark X wrote:
Lawn mower makes an intermittent very loud screatching noise when in
use. The start pull cord loosens slightly when this happens and there
is some vibration from around the pull cord casing.

The mower is a Briggs and Stratton Sprint 375.

Any ideas?

Very common - The pull start clutch shaft needs lubrication.
Take the pull start cover off.
Pry the metal cap off the clutch - now remove the ball bearings.
Now remove the square drive - lubricate the shaft with a small amount
of grease. Not too much or it will run down onto the balls and they
won't work as a clutch.
Reassemble and make sure the square drive only turns in one direction.
They can size to the shaft and alas it is part of the crankshaft, in
which case I would take it to the dealer. BTW I've fixed lots of
sized ones - you don't really need a new crank shaft!

The above refers to this type of Clutch:
http://images.google.co.uk/imgres?im...%3Den%26sa%3DN
or
http://tinyurl.com/6ez64x

Slatts

Ty

er..........
Brian

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