PS Magazine - TB 43-PS-696

PS, The Preventative Maintenance Monthly

ISSUE 696

NOVEMBER 2010
PS Magazine - TB 43-PS-696 - Page 9 of 33
14
PS 696
NOV 10
15
PS 696
NOV 10
Dear Editor,
The current FMTV wheel end hub adjustment procedure in our manuals is
hard to do correctly. This procedure sets the play for your wheel end spider
gear. The TM calls for a measurement from the hub face to the wheel nut
with only a 0.005-in variance.
Soldiers in the field must use
a depth micrometer to correctly
take and calculate the wheel end’s
shim thickness. Failing to shim the
wheel hub correctly could result in
premature hub and bearing failure,
so you want to get this right.
Troops have come up with different
measurements, some even as far
out as 0.030 of an inch!
Then one smart Soldier, with
the help of a local machine shop,
designed a tool that takes the
micrometer reading and the math
out of this procedure. The new tool
consists of a digital dial indicator
and a tool rest bench.
The tool rest bench is machine
ground to the mean of the hub
variance measurement. While on
the rest, zero the dial, then align
the tool on the hub face. The
measurement on the indicator is
the amount of shims required.
This tool
-while on the rest-can also be used to measure the shims
for proper thickness. Using this tool results in a quicker, more accurate
procedure that requires less double checking by supervisors and is less
confusing to users.
This tool is difficult to
make, so we recommend units
purchase it directly from the
manufacturer:
Debolt Machine, Inc.
Attn: Paul Debolt
4208 West Pike
Zanesville, OH 43701
Email:
debolt@columbus.rr.com
Phone: 740-454-8082
The boxed and ready-to-
use digital dial indicator and
tool rest bench together
cost about $1,012. The
tool is stored in a wooden
container and it comes with
operating instructions.
Tom Tarrell
FMTV Equipment Specialist
TACOM LCMC, Warren, MI
Editor’s note:
Thanks for sharing
that super shim solution, Tom.
FMTV…
New tool lifts
off of tool rest
bench
Tool in use
Tool comes in wooden container
{sigh} my mechanic
didn’t know how to
adjust my end hub!
whassa
matter,
buddy?
696.14-15.indd
1-2
10/5/10
10:57 AM
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