PS Magazine - TB 43-PS-666

PS, The Preventative Maintenance Monthly

ISSUE 666

MAY 2008
PS Magazine - TB 43-PS-666 - Page 3 of 33
2
PS 666
MAY 08
R
econnecting the main hydraulic pump’s pretty easy, right mechanics? After all, the
supply and return lines have bolt-down couplers and the case drain line has a quick-
disconnect (QD) that makes the job pretty straightforward.
W-e-e-ll, maybe not.
The case drain line sits back
in a corner, so if you still have an
old QD, NSN 4730-01-081-2106,
installed, things can be a little
tricky. Those old QDs may seem
to be securely attached only to pop
loose later. And a loose connection
increases the chance of an engine
Fre and increases hydraulic pressure
and temperature that could ruin the
hydraulic pump.
That problem has been Fxed with a replacement QD, NSN 4730-01-509-1330.
This “sure lock” QD provides a one-way only connect feature that ensures a
positive lock.
C
rewmen, the tracks on your M1-series tank throw up a lot of rocks and debris
during cross-country operation. It only takes one thrown at the right angle and speed
to put a crack in one of the plastic roadwheel hub caps.
If you’re having trouble keeping the case drain line QD connected, it could be that
your tank still has the old one installed. If your QD is orange in color, it’s the old one.
Get your mechanic to change out the old unserviceable QD at the next scheduled
service or when the powerpack is pulled for non-scheduled maintenance.
The new QD will be a dark color and have two notches at the opening end.
Oil leaks out of the cap and eventually
the hub bearings seize up. That’s an
expensive and time-consuming repair.
You can help prevent that problem
by checking the hub caps frequently
during stops. If you notice an oil leak,
tell your mechanic.
He’ll install a new cap, NSN 2530-
01-063-5862, and torque it to 40-60 lb-
ft like it says in the -20-1-4 TMs.
M1-Series Tanks…
Not So Quick on
the Disconnect
M1-Series Tanks…
Check for
Cracked
Caps
Rocks and other debris can crack caps
New QD
is dark
and has
notch on
each side
Old case drain line
quick-disconnect
can pop loose
uh-oh!
there goes my
case drain line
quick-disconnect
again!
sounds like
you’ve got
the
wrong
quick-
disconnect
installed!
I sure hope
they check my
roadwheel hub
caps at the
next stop!
666.02-03.indd
1-2
4/1/08
2:19:31 PM
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