Wallowed out tie rod end hole on a steering
knuckle on a 4WD John Deere tractor. $1800
part. Got a new tie rod, trying to figure out
the taper so I can get a reamer. It's a ZF
axle, so it's probably metric. Does anybody
KNOW what the taper is? Looks really close
to 1 in 12, but is it?
Source for a left hand spiral right hand reamer?
Had the same problem on an old Deere backhoe, though it was a $165 part.
I put the knuckle on the mill and bored out the worn out section with a
1" end mill. Put some 1.25" bar in the lathe and turned to match the 1".
Drilled and bored the matching taper into the bar (don't recall what it
was). Cut the insert to length, pressed it into the knuckle, welded both
ends, ground flush and it worked good as new.
Thanks Pete---If it was a one time thing that's
what I would do too. The outfit I work for
has a half dozen of these mechanical front drive
tractors. At 2 per tractor, and as big a
pain in the ass as it is to get the knuckle off
(drop the wheel/tire and then a planetary
gearbox), I figure that a reamer will pay for
itself quickly. Weld it up, grind/drill it
ream to finish---all on the tractor. Sure wish
you could recall what that taper was!
I've measured it three times, and it comes out
at just barely over 1" in 12". That's on the
male tie rod end. Do they do a crush lock on
those? Is the hole a true 1:12? The
Metric tapers I find reference to on tie rod
ends are 1:10, and it's not that.
You might either make a casting around the male taper or turn a matching
female taper on the lathe. You can then then measure the taper as accurately
as it really is by measuring the depth of two different size balls in the
hole. Ideally the large ball should go just over halfway into the large end
of the taper and the small one should stick out of the small end slightly
less than halfway, but it is not critical.
Measured the large and small end with a 0-1
mike. Length with a vernier caliper.
Comes out at 1.0603" per foot. That's an
average of 3 readings, but none of then varied
by more than a few thousandths.
If I set the new tie rod end up on the mill
table, dial it concentric (vertical), put a dial
in the quill setting horizontal on the
centerline I should be able to get a very
accurate read on
the taper by computing the dial indicator
against the quill DRO.
I guess I'm just trying to be a little lazy,
hoping that somewhere in the near infinite
knowledge of the group there was someone that
had "been there, done that", and I would have
complete with the supplier and part number for
the reamer. Oh well, guess I'll have to do my
own homework. :-)
I have been told there are industry standards that everybody adheres to, but
I personally cannot confirm that. What I do know is there appears to be two
stardards used in the the States. They are 1.5" per foot which are used on
most tie rods and shock mounts and the 2" per foot standard. Both reamers
are available from
part# R8201 (1.5") and R8202
(2"). They are around $100 each. Visit their web site and buy on-line. I
have both and the quality is OK.
5º IIRC, been a while, but used to be a good little earner
resurrecting JD frontends.
I don't like your chances of remedying oval holes in situ
with a reamer. Boring and sleeving was the norm.
-- Posted on news://freenews.netfront.net - Complaints to email@example.com --
"Steve Lusardi" wrote
Yup---I've used both of them at one time or
another. Also called 7 degree and 8 degree
There is also a 1.2" per foot (1:10) reamer out
there that I've found reference to. It appears
be the taper for Toyota?
The JD tractor steering doesn't appear to be any
of the above. It's close to a 1:12, but not
quite. The front steering axle is a ZF.
Everything below the mount appears to be metric.
What started out as a couple of mouse clicks to
order a reamer is getting interesting.
Engineers love standards -- that's why there are so many of
Unka' George [George McDuffee]
He that will not apply new remedies,
must expect new evils:
for Time is the greatest innovator: and
if Time, of course, alter things to the worse,
and wisdom and counsel shall not alter them to the better,
what shall be the end?
Francis Bacon (1561-1626), English philosopher, essayist, statesman.
Essays, "Of Innovations" (1597-1625).