In the last ten years ive had quite a bit or experience with the following tractors and this is my experience in short
1992 Kubota
L4850 Sync Shuttle - good solid tractor with Lauren Cab used for plowing snow with Heavy duty 10' Plow Blade mounted on loader arms and no major problems, traded in in 2002 for the Following
2003 Kubota
M4900 with factory cab with our old HD 10' plow mounted on loader arms - On purchasing I was told the M series was built with a more heavy duty frame and drive train but the options were not as available as the L series
"Aprox. 10 Hrs Front rims had excessive wear around studs, seemed as though the lug nuts came loose and wore holes, after contacting the Dealer/Service Manager ,I was instructed to rotate the rims to the other set of holes and torque the lugs (flat side in). After about 6 hrs the rims where worn again and the lug nuts loose, I contacted Dealer/Service Manager again and e-mailed pictures to him.
On March 18, 2003 The mechanic from Dealer came down and chased the stud holes, installed new studs, Wheel & Tire assembly with new lug nuts, torque the wheels to 144 ft/lbs Test drove the tractor and re-torque the wheels.
I was instructed to re-torque the wheels after 1 hr and check every hour after that, re-torque them at 5 hrs then 20 hrs.
I re-torque the lugs at 17 Hrs March 21, 2003. 1 Hour after installation of new rims and found they were still tight.
I re-torque the lugs at 21 Hrs April 1, 2003. 4 Hour after installation of new rims and found they were still tight. Tractor had plow on for 2 Hrs."
07-Jan-04 Break Down 409 hours
Front Right Axle Leaking
Engine Oil & filter change, Tighten front rims, replace front right axle bearings & seal, fill front hubs & axle, complaints of stiff shifting from forward to reverse, lubed shifter linkages under floor corrected problem.
04-Mar-04 Break Down 498 hours
"Front Right Axle Leaking
Sent to Dealer for warranty where they changed All bearings, Seals, O-rings on both sides & Left Housing etc. Dealer recommended we down size or plow to a regular duty 9' (so we did)
Total cost of job if not warrantied $1856.85"
02-Dec-04 Break Down 695 hours
Grinds going into reverse, sent to Dealer to find that the reverse snycro was worn, Replaced reverse syncro assembly.
Total cost of job if not warrantied $1542.82"
04-Jan-05 Breakdown 737 hours
Front Left Axle Leaking, sent to Dealer to be repaired under warranty, Dealer modified the turning radius so it wouldnt turn as sharp by installing bigger stop blocks on the front axle
14-Dec-05 Breakdown 1120 hours
Sent to Dealer for oil leaking into bell housing
10-Jan-06 Breakdown 1145 hours
Oil leak in clutch Housing Sent to Dealer for repair, see papers in
M4900 binder
13-Mar-06 Breakdown 1152 hours
Starter still not engaging properly, sent starter for rebuild, appears to be working good Starter rebuild 354.20 228000-9880
29-Aug-06 Breakdown 1268 hours
Neutral safety switch not working properly, seemed to work fine when tested although bullet connections seems loose
30-Oct-06 Breakdown 1423 hours
Change engine oil and filter, topped up antifreeze, Throw out bearing squeling sent to Dealer for repair, Replaced clutch cover assembly, Replaced release bearing, Replaced pilot bearing, NOTE clutch and flywheel are in good shape no replacement required
For further notes see papers in
M4900 Binder"
05-Nov-08 Break Down 2065 hours
Right Fuel Tank Leaking, replaced both fuel tanks with new tanks and sending unit (undercoated tanks prior to install) total cost both tanks and sending unit $1200.00
29-Apr-09 Break Down 2255 hours
Left front Axle seal leaking, after closer inspection found outer axle bearing cage busted and metal fragments through out hub assembly, replaced bad bearing and seal and cleaned and reinstalled bearings in both front hub assemblies, refilled with new 80W90, replaced drive shaft seal on front hub as well,
20-Sep-10 Breakdown
New Battery, 75 amp fuse Battery
17-Jan-11 Breakdown 2730 hours
"Front Left Axle Leaking
Engine Oil & filter change, replace front Left axle bearings & seal, fill front hubs & axle, Forward to reverse shifter stuck in Reverse, replaced worn bushing and pin, and lube all linkages, greased, fixxed joystick cables, cleaned and coated battery terminals
So you can see that we didnt have the best of luck with the M series Kubota
But we were extremely pleased with the L series
Now we currently have a JD 5075M
So far so good

wish me luck