[AT] MT 1155 hydraulic system was 8.9 liter Perkins

[Cecil Bearden]

Too much digging right now to find the old manual.  We have about 2 days 
of good weather before we get hit with more freezing drizzle.  I spent 
the last 4 days of decent weather getting shale hauled in to build some 
roads across this soggy ground so I can feed my cattle.  I even had to 
install a 100 ft long gravel drain to prevent the road from getting 
saturated.   I would have thought that I could find it on line, but 
there are too many trying to make a buck off of manuals on line 
now...    BTW, my cell phone is one of the old flip phones and it does 
not like to copy pages. They just turn out as white.... We do not have 
4G service where I live.  Our phone lines are so bad that when it rains 
they buzz for 3 days.   Due to the wet weather, no ones land lines are 
working out here.  Our wifi is so over loaded, it is a little faster 
than dialup, but no way can you watch a movie.   Cable has not reached 
us due to the county and city can't figure out who gets the kickback..  
We don't have natural gas even though we are saturated with gas wells 
and pipelines.  The gas company tells us that there are not enough 
people worth running a line.
I spent 4 hours today hauling trees out from around an old barn that we 
store equipment in.  I had not taken care of the trees in a few years, 
and we had 10 inch cedars all around it.  I used the E110B Cat excavator 
and tore them out.  I used to use this building with the big shade tree 
as my main work area.  It was nearly always cool during the summer and 
since it was at the bottom of the hill, it was out of the wind.  There 
was a lot of old salvage parts and equipment around it with trees 
growing through everything...  I have an 8inch Morbark tree chipper, but 
when it was loaded on the truck they broke a hydraulic line and I have 
to nearly take it apart to get the line replaced.   Yesterday it was 
above freezing, but the wind was 35mph gusting to over 50mph, so I hid 
inside....

Cecil

On 2/24/2019 4:40 PM, James Peck wrote:
> Cecil,
>        Any luck finding the MF 1155 manual You do not need to scan the hydraulic schematic page if you find it. Just snap a shot with your cell phone.
>
>       Any modern bonified tractor mechanic training program is going to include a fair amount of mobile hydraulics content.
>
> [John Maddock] 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.
>
> The medium horsepower tractors had a fourth (gear) pump with its own oil supply, driven from the engine for power steering.
>
> [Dennis] I agree that using relief valves to regulate pressure or flow is not a  good thing, especially with a fixed displacement pump. I have seen it  done before, but agree that it generally just makes heat. It might  work with open center valves where there is no pressure in the circuit  until a valve is actuated. With closed center valves it is just a heat  generator that wears out relief valves and hydraulic fluid. I have trouble believing a tractor manufacturer would design a system  like this. I think a more probable design would be a 3 stage pump or  multiple pumps. If they were pressure compensated pumps it would be a  great circuit
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