[AT] 8.9 liter Perkins

[Cecil Bearden]

Ralph:
I had 2 Massey 85's and still have a Super 90 that needs to be put back 
together.   It had a cracked block.  If you take that little pump off, I 
bet you will find that the gears have scored the side plates of the 
pump.  If you an find a machine shop with a surface grinder, you can 
grind the side plates smooth again.   The gears are probably oK, but if 
not they can be resurfaced and the entire pump reassembled with the 
right clearance.   If the gears are reground,  the center section will 
need a little resurfacing. We did ours many years ago for less than $100 
when the price of a pump was over $1800.  If you can find a hobby 
machinist, they usually jump at the chance to do some real work....  I 
was going to resurface ours on the lathe, but an old retired machinist 
friend had a surface grinder...
Cecil

On 2/24/2019 4:53 PM, Ralph Goff wrote:
> On 2/24/2019 3:53 AM, John Maddock wrote:
>> I note that the 1155 was built between 1973 to 78.  As I understand, MF
>> lower horsepower tractors of a similar age (and certainly the 100 
>> series)
>> had three pumps: the Scotch yoke piston pump to drive the 3 pt lift; an
>> internal  gear pump driven by a gear off the pto shaft to supply 
>> external
>> services, a second gear pump piggy-backed on the first gear pump to 
>> supply
>> Multi-power and pto clutch packs if fitted. A pressure maintaining valve
>> was fitted on the line to the Multi-power clutch to maintain the 
>> pressure
>> for the PTO clutch when Multi-power was set to "low", the oil being 
>> dumped
>> in that state.
>
> I think my Super 90 only has two pumps. The main "Scotch yoke" pump 
> that supplies the hydraulic outlets and then a second, smaller pump, 
> further ahead,
>
> between the clutch and transmission. That smaller pump supplies the 
> power steering and pto engagement. That small one is weak on mine and 
> it gives
>
> priority to the steering. Result is that the pto will stop when I turn 
> a corner if there is much of a load on it. So that tractor is not too 
> practical for pto work.
>
> The price of a new pump is about as much as the tractor is worth so I 
> only use it on jobs that do not require pto.
>
> Ralph in Sask.
>
>>
>
>
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