MF 4840


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MF 4840

stubblefeist I just bought an MF 4840 tractor at an estate
auction. It has the 903 Cummins and 18-speed
transmission. I've driven 1505's and 1805's
for years, but know nothing of the 4000 series
tractors. What do I need to look out for?

Mike 4000 Massey pretty good tractor. 903 excelent motor. Clutch and trans were made just for these units. Tran is massive but contains alot of two piece snap rings that like to come apart with big load changes, like downshifting the powershift while pulling loads down road. All upshifts do fine as well as downshifts under a pull. I would throttle way down while transporting, then downshift, its not so jerkey. Also make sure you have freeplay in clutch pedal, can loose a clutch if not kept adjusted. Don't want to have to work on tranny, cab must come off and it weighs 4000 lbs. Should be good tractor for you, good luck.
stubblefeist Thanks for your comments. Good to know about
trans snap rings; need to adjust clutch brake;
tractor has 6200 hrs, supposedly had engine and
trans work about 3000 hrs back.

Larry My uncle's estate will be selling his one-owner 4840 this fall.
The tractor is in decent shape. If I buy it at auction, what wheels
can be used to replace the obsolete 20.8x34's? Can you substitute
an inline 6 such as an Cummins L-10 or larger or do you need
significant modifications to the frame, etc?

Thanks for your advice.




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