PS Magazine - TB 43-PS-667
PS, The Preventative Maintenance Monthly
ISSUE 667
JUNE 2008
8
PS 667
JUNE 08
Lowering the Cab
Before lowering the cab, check inside
for any TMs, tools or other items that may
have fallen around the accelerator and brake
pedals. Anything that gets in the way will be
crushed and can damage the control linkages
as the cab is lowered.
Once the cab is down, lock it down right
or you could ruin the threads on the hold-
down nuts or crack the frame.
If the nuts are not seated or tightened right,
the cab sits cockeyed. The frame can crack
as the cab flexes. The nuts can bind, too, so
keep the threads clean. Never cross-thread
‘em or the entire hold-down assembly has
to be replaced. Use a little oil on the threads
occasionally to make the job easier, too.
Release the tension on the elevation mechanism after the hold-down nuts
are tightened. That way, there’s no pressure on the mechanism while you’re in
operation. If you can move the elevation mechanism with your Fngers, the tension
is released.
Radiator Plenum Seal
Check the radiator’s plenum seal at
least semiannually for cracks and tears. A
bad seal lets in dirt, sand and insects that
will coat the radiator Fns and keep your
engine from cooling off.
Raising the Cab
Before raising the cab, eyeball the cab hinge studs and nuts for cracks. If you Fnd
any, let your mechanic know. Don’t raise the cab until cracked studs and nuts have
been replaced. You don’t want to be under the cab if the hinges fail!
Also, remove all equipment
stowed on top of the cab before
raising it. The elevating jack
assembly can’t take the extra
strain, and falling equipment
could kill or injure you or
others.
Slow and easy is the way to
raise the cab. The faster you
go, the more the cab rocks
back and forth. That puts a lot
of strain on the hinges.
Once the cab is up, check
the hinge studs and nuts on
the inside, too. Again, your
mechanic should replace any
damaged ones.
Door Seals
The cab is over-pressurized during
Fring to prevent toxic fumes from
entering the cab. If the door seals aren’t
in good shape, rocket exhaust gas can
enter the cab.
Check the rubber seals
before
every
operation. If they are dry or brittle, get
‘em replaced.
Air Filters
Eyeball the air cleaner indicator in
the engine compartment
before
every
operation. If the indicator is in the red,
double check it like this:
1.
Push the reset button.
2.
Start the engine and hold the
accelerator pedal all the way down for
5 seconds. Then let the engine idle for
about 30 seconds.
3.
Cut the engine and recheck the
indicator. If it’s in the red again, remove
and clean the air Flter V-pack.
Cold Start Pump
The Fttings on the cold start pump
crack from wear and vibration.
±uel drips from the Fttings to the
rocker arm covers and then onto the
exhaust—a real Fre hazard.
Eyeball the Fttings for cracks
before every operation. ±eel for
moisture and then smell your Fngers
for any trace of fuel. Immediately
report a potential leak.
Check cold start pump
for cracks or moisture
Bad seal means dirty radiator
Air cleaner
indicator
in red?
Check door seals for damage
Check external hinge nuts…
…and internal
nuts for cracks
Keep items
away from
pedals
667.08-09.indd
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4/27/08
6:23:59 PM
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