New PTO Clutch Slipping

DPARENT · Feb 18, 2020

Hi everyone. Changed to a brand new clutch kit on my 65D and made all the adjustments, as prescribed in the manual, such that the clutch pedal has 1-1.5" free travel at the top and pressure should thus be maximal on the PTO clutch. Yet, it starts slipping when too much snow enters the snowblower. Transmission clutch works like a charm. If only the PTO did the same... No traces of oil in the compartment. I can only think of the Belleville spring as being the culprit.
Thanks--Daniel

DavidP, South Wales · Feb 18, 2020

Hello, you haven't mentioned it but did
you remove the 3 slave screws from the
cover? Do you have the correct coil
spring loading for a 65? If you have coil
springs you should have 9. If this is
wrong you may well have a unit with a
weaker belleville spring.....one for a
35/135 perhaps with 6 red coil springs.
Are the first and second stage clearly
defined? That is to say that you do not
enter the second stage before the first
has released.
DavidP, South Wales

Dieseltech · Feb 18, 2020

Either oil is on the PTO disc, or assembly has the wrong
BELLVILLE PTO pressure spring. The COIL springs are for
the main disc pressure, NOT PTO

Young Mechanic · Feb 18, 2020

Not trying to be a jerk, but could it just be the slip clutch on the snow blower slipping and not the tractors fault. That is if the snow blower has a slip
clutch.

DavidP, South Wales · Feb 19, 2020

My point was that if the incorrect number of coil springs are fitted then it could be the wrong clutch unit with a lower belleville spring clamp load. I am well aware that the coil springs have no bearing on the PTO plate.
DavidP

DPARENT · Feb 21, 2020

Thanks David,

There is no clear separation between the 1st and 2nd stage, at least not one that is felt on my foot. As a comparison, we grew up with a David Brown 950 which also has a two-stage clutch, and that one you really knew you'd hit the 2nd stage. So, given that, I am not so surprised that it slips under a moderate-heavy load. We did remove the slave screws. I will check the number of coil springs over the weekend but I am pretty sure we installed the right unit. You sowed doubt in my mind though.
--Daniel

(quoted from post at 16:42:01 02/18/20) Hello, you haven't mentioned it but did
you remove the 3 slave screws from the
cover? Do you have the correct coil
spring loading for a 65? If you have coil
springs you should have 9. If this is
wrong you may well have a unit with a
weaker belleville spring.....one for a
35/135 perhaps with 6 red coil springs.
Are the first and second stage clearly
defined? That is to say that you do not
enter the second stage before the first
has released.
DavidP, South Wales

New PTO Clutch Slipping

DPARENT

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DavidP, South Wales

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Young Mechanic

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DavidP, South Wales

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DPARENT

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