PS Magazine - TB 43-PS-570
PS, The Preventative Maintenance Monthly
ISSUE 570
MAY 2000
621B Scraper . . .
Blow out dirt and sand
Board saves blacktop
Keep heel off differential lockout
greases the shaft in the scraper’s steer-
ing column. You’ll know something’s
up when the steering starts to bind
when you make a turn.
Give the fitting four or five pumps
of grease during the 2,000-hour ser-
vice or annual service, whichever
comes first.
scraper hits engages and disengages the
differential. That overpressurizes the
transmission and blows its internal dif-
ferential seal. End result—your scraper
is going nowhere!
So use the footrest, but keep your
boot away from the differential lock-
out.
Moldboard Needs a Rest
Protect your motor pool blacktop
when you park your scraper at the end
of the day. When your scraper shuts
down, the vehicle’s hydraulic pressure
is released. The weight of the mold-
board rests on the ground—letting the
cutting edge settle an inch or two into
the blacktop. When it’s time to get up
and go, the blacktop gets ripped up.
Prevent that damage by putting a
6x4-in or 4x4-in board between the
blacktop and the vehicle’s moldboard.
Differential Lock No-No
Using the scraper’s footrest is a great
idea—unless your left heel rests against
the differential lockout. Any bump the
Battery Box Clean-up
Eyeball the battery box during your
weekly PMCS. Dirt and sand will settle
around the batteries.
When that stuff gets wet and packed
in, the batteries are a bear for your
mechanic to get out. So, blow out dirt
and sand with compressed air.
Snub No Grease Fitting
Even with power steering, that big
dirt-moving rig is hard to steer. There
are up to 33 tons of iron and dirt to
move around.
One of the grease fittings often over-
looked during lubing is the one that
Steering column needs lube, too
gauge
tire
pressure
before
operation.
front tires
get 60 psi
and rear
tires get
40 psi.
you're
ready
to
go
, big
fella!
Great
!
your pm
will keep
me scrapin'
for the
long
haul
!
PS 570
25
MAY 00
24
MAY 00
perators, that old 621B scraper
has moved dirt like it’s supposed to for
a long time now. But, it’ll go a lot
longer if you stay on top of PMCS and
keep it in shape.
After you follow the PMCS in TM
5-3805-248-14&P-1, go the extra mile
with these PM tips.
Keep Your Eye on PSI
Before you head out, gauge tire pres-
sure. An underinflated front tire may
slip on the rim, causing it to overheat
and blow out. Or the tire-to-rim seal
will break and the tire will go flat.
Back to Top Back to Top
