high altitude 555???

Russ Schultz · Oct 19, 2012

i found in the bush to what i seem to believe is a massey harris 555 diesel high altitude. whats the difference between a regular 555 diesel?
anyone know how many produced? can anyone confirm it is actually a high altitude?
serial number - D1SFA 20722
thanks

BIG RUH · Oct 19, 2012

D stands for diesel
1 for regular altitude
S for standard
F for foot clutch
A high altitude
Biggest difference between high & regular altitude is engine compression. High has higher compression. And you have a 1956 according to the seriaal#

Russell Schultz · Oct 19, 2012

So seeming how I have a 1 for regular altitude and also an A for high altitude, what do I have?

earnest T · Oct 19, 2012

According to my 555 book, 1 is 1000 ft elevation while 5 is 5000 ft elevation. Now, there could be a letter A or P after the serial number which means it has an APE Pump or PSB Pump - which do you have?

Russell Schultz · Oct 19, 2012

Makes sense Ernie. It has and inline pump which I believe is an APE

high altitude 555???

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