PS Magazine - TB 43-PS-570
PS, The Preventative Maintenance Monthly
ISSUE 570
MAY 2000
PS 570
8
MAY 00
PS 570
9
MAY 00
Your mechanic will back off each
bolt and then torque it to 125–135 lb-
ft.
Wheel Nut Torque
Wheel nuts loosen in use, too. This
makes for bent or broken studs and
possibly a runaway wheel.
If you find wear or a clearance
problem, write it down so your me-
chanic can replace the hose or fix the
clearance.
Loose Steer Gear?
Steering gear bolts work loose, which
makes for sloppy steering. So, eyeball
the bolts before you move out. If you
see shiny spots—or rusty spots that
were shiny before corrosion set in—
around the bolt heads or nuts, report
them.
Never bang either filter on a rock or
hard surface ’cause you can bend or
dent them so badly they won’t seal right
in the canister and keep dirt out.
Air Hose Rub
Eyeball the air hoses for the front
wheel brake chambers. Hoses tend to
rub against the tires when you turn,
especially if there’s not enough clear-
ance between the hose and the tire.
Enough rubbing will cause leaks and
you’ll be brake-less next time you need
to stop.
Before leaving the motor pool, turn
the front wheels full right. Get down
and look for an air hose worn through
its outer cover. Look also for an inch
of clearance between the hose and the
tire. Then turn the wheels full left and
make the same check on the other side
of the truck.
Steering gear bolts tight?
HEMTT Wreckers . . .
Wrap Hoses Against Heat
ou HEMTT wrecker operators and mechanics know well that the hydraulic
fluid inside the system hoses and lines gets very hot when you’re recovering
another vehicle.
What you may not know is that there’s a bigger heat danger from outside the
hydraulic system—the power take-off (PTO) assembly. Heat from the PTO can
weaken hydraulic hoses enough to cause a rupture, spraying hot fluid over
everything and everybody.
So, eyeball the outlet and inlet hoses that crisscross above the PTO assembly.
If the hoses touch it, you need to
isolate them so there’s extra protec-
tion against heat and wear.
Take pieces of battery matting,
NSN 6160-01-389-1966, and install
them with worm-type clamps wher-
ever a hose rests against the PTO.
You can get worm clamps with NSN
Lug nuts tight?
During the next scheduled service,
your mechanic will torque nuts to:
Before heading out, take a look at
the nuts on each wheel. Look for
chipped paint, shiny spots or rust
around a nut. If you see any signs of
loose nuts, grab your tools. Back off
the nut, then retighten it.
Keep an eye on the air cleaner indi-
cator, too. If it shows red, stop and
clean out the filters.
Pop the canister lid and pull out the
air filters. The secondary filter is in-
side the primary filter. Tap each one—
hard—with the heel of your hand to
loosen dirt. Then tap some more to
knock stuff out of the filters.
Primary filter
Secondary filter
Vehicle
Front (lb-ft)
Rear (lb-ft)
All (except
575–625
450–500
M984E1)
M984E1
575–625
575–625
got all
that?
Y
1-in clearance between hose and tire?
Isolate hoses against heat .
..
...from PTO
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