PS Magazine - TB 43-PS-577
PS, The Preventative Maintenance Monthly
ISSUE 577
DECEMBER 2000
PS 577
9
DEC 00
8
DEC 00
M915, M915A1, HEMTT . . .
Air Dryer Service
Y
ou don’t have to spend a mint
to service the air dryer on your
big trucks.
Some mechanics clean the
dryer by replacing the entire car-
tridge, but that’s not necessary
and it costs a lot of money.
Smart mechanics know to clean
the dryer by using desiccant parts
kit, NSN 4440-01-081-1391. The
kit has everything you need, in-
cluding instructions, to make the
cartridge as good as new.
ie a string around a finger or write
yourself a note, operators, but don’t
overlook a few often overlooked grease
fittings on M915-series and M915A1-
series tractor trucks.
First of all, make sure you lube fan
clutch actuators that have grease fit-
tings. Some actuators are sealed and
cannot be lubed. Look right behind the
top fan belt pulley—a spot that’s easy
to overlook—for a grease fitting.
Without lube, the actuator burns out.
Then the fan won’t cool off the en-
gine, the engine overheats and your
truck is NMC.
When pumping grease into the fit-
ting, make sure
not
to get any grease
in the fan belt grooves. Greasy grooves
cause the belt to slip.
M915/M915A1-Series Tractor Trucks . . .
Lube fan clutch actuator fitting
Keep grease out of
fan belt grooves
Before you pump the gun, be sure to
wipe off the fittings so you don’t shoot
dirt into them.
ing area. Be careful, though, not to
damage the rubber bushing insert ends.
Also, grease may go in easier if you
jack up the truck to take the load off
the springs.
While you’re at it, make sure the
fittings for the drag link are lubed, too.
All these fittings keep suspension parts
lubed for a better ride and longer life.
If the fittings will not accept grease
because the old grease inside is too
hard, try warming the fitting and bush-
Second, make sure you lube the leaf
spring bushings at the hanger brackets.
Lubed bushings keep the springs riding
freely up and down. Give them four or
five pumps of grease during scheduled
services.
hmmm.
..
now
why
did i
tie this string on
my finger?
probably
to remind you
to
lube
my
fan
clutch actuator
fitting
.
smart
mechanics use
a dessicant
kit.
...and rear leaf spring bushings
Lube front.
..
Lube drag link
PS 577
9
DEC 00
8
DEC 00
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