PS Magazine - TB 43-PS-628

PS, The Preventative Maintenance Monthly

ISSUE 628

MARCH 2005
PS Magazine - TB 43-PS-628 - Page 14 of 33
PS 628
MAR 05
25
D7G Tractors…
sounds like
the high lone-
some whine of
a transmission
singing the
blues!
D
ozers are racking up more hours of operation as they continue to move sand and
dirt around the worksite. Follow the word in TM 5-2410-237-10 and ponder these
transmission tips to keep your dozer mission-ready.
You pushed a load of sand out of the way and you’re heading back for more. But
when you slammed those gears into reverse and moved out, you heard a mournful
whine. That’s your dozer’s transmission singing the blues.
Every time you shift in or out of reverse without reducing engine speed you put
unnecessary strain on your dozer’s transmission. That’s bound to shorten its life.
Here’s how to change that tune:
1.
While your dozer’s still on the move, push down the decelerator pedal. That slows
down engine speed without changing
the governor control setting.
2.
Stop your CAT dead in its tracks.
3.
Shift in or out of reverse.
4.
Then ease up on the decelerator
pedal to speed up the engine and return
it to the governor control setting.
Decelerate
to shift
into or out
of reverse
Snug Filler Plug
Vehicle vibration causes the
plug (cap) in the transmission’s
oil filler tube to come loose. A
missing plug means dirt, dust
and water can get into the dozer’s
transmission—not good.
Before the day’s run, make
sure the plug is snug. Do not
stuff a rag or anything else in the
filler tube if the plug is missing.
Instead, have your mechanic
replace the plug with NSN 4730-
01-249-8409. It’s shown as Item
7, Fig 82 of TM 5-2410-237-24P.
Breather Valve Reminder
One breather valve that’s overlooked is the
one for the dozer’s transmission—it’s under
the operator’s seat.
Two things happen when the transmission’s
breather valve is clogged:
•
Pressure builds in the transmission, causing
the seals to blow. And when the seals go, the
lube goes too. No lube means no gears.
•
Pressure buildup also creates a vacuum in
the transmission. When that happens, the trans-
mission stalls or locks up. You can’t move!
So keep the breather valve clean. It’s simple.
Just tap down on the valve to loosen any dirt
stuck inside. If the valve won’t tap or pull up,
have your mechanic replace the valve with
NSN 2520-01-164-0077. It’s shown as Item 9,
Fig 83 of TM 5-2410-237-24P.
gets breather valve for
transmission
Oil filler tube plug comes
Before Shifting
628.24-25(C)
1/25/05
10:37 AM
Page 1
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