I recently made some repairs on our M670
differential and transmission and now have
a loud chatter coming from the amplitorc.
It was not making this noise before I made
the repairs. I replaced all the bearings
in the differential including the axle
bearings. I had everything out of the case
except the pto output shaft. Made sure
everything was set up according to my
service manual with all bearings preloaded
to specs. I also replaced the two bushings
in the reverse idler, because one of them
had walked out of the bore causing it to
jump out of gear when putting a heavy load
on it while in reverse. I noticed that
there was excessive endplay in the
transmission topshaft bearings so I
preloaded them to spec listed in the
manual. Got it all back together and
drove it around to test out all the gears.
Everything sounds good except direct drive
while in 5th gear. It chatters really loud
below 1200rpm. If I speed the engine up
above 1200, the chatter goes away. If I
place the amplitorc in low, the chatter
goes away. Depressing the clutch doesn't
affect it. The chatter is still there
while it is rolling with the clutch
depressed. The amplitorc did not receive
any repairs...everything looked good
there. I never removed the output sun gear
from the rear planetary section, so I
didn't figure I would need to worry about
the alignment of the planetary gear oil
grooves with the center of the sun gear as
it states in the manual. Did I make a
mistake here? Could that be causing the
noise? If so, that doesn't make sense to
me because, if I'm thinking right, the
planet gears are not rotating around the
sun gear while in direct drive. The whole
unit would be rotating. I did put a new
aftermarket clutch disc in. Could the
dampener in this disc be causing the
noise? Any input would be greatly
appreciated. I'm kinda at a loss here and
really hope I don't need to split it
again. Thanks in advance.
Bill
differential and transmission and now have
a loud chatter coming from the amplitorc.
It was not making this noise before I made
the repairs. I replaced all the bearings
in the differential including the axle
bearings. I had everything out of the case
except the pto output shaft. Made sure
everything was set up according to my
service manual with all bearings preloaded
to specs. I also replaced the two bushings
in the reverse idler, because one of them
had walked out of the bore causing it to
jump out of gear when putting a heavy load
on it while in reverse. I noticed that
there was excessive endplay in the
transmission topshaft bearings so I
preloaded them to spec listed in the
manual. Got it all back together and
drove it around to test out all the gears.
Everything sounds good except direct drive
while in 5th gear. It chatters really loud
below 1200rpm. If I speed the engine up
above 1200, the chatter goes away. If I
place the amplitorc in low, the chatter
goes away. Depressing the clutch doesn't
affect it. The chatter is still there
while it is rolling with the clutch
depressed. The amplitorc did not receive
any repairs...everything looked good
there. I never removed the output sun gear
from the rear planetary section, so I
didn't figure I would need to worry about
the alignment of the planetary gear oil
grooves with the center of the sun gear as
it states in the manual. Did I make a
mistake here? Could that be causing the
noise? If so, that doesn't make sense to
me because, if I'm thinking right, the
planet gears are not rotating around the
sun gear while in direct drive. The whole
unit would be rotating. I did put a new
aftermarket clutch disc in. Could the
dampener in this disc be causing the
noise? Any input would be greatly
appreciated. I'm kinda at a loss here and
really hope I don't need to split it
again. Thanks in advance.
Bill