PS Magazine - TB 43-PS-630
PS, The Preventative Maintenance Monthly
ISSUE 630
MAY 2005
T
hese scrapers are racking up many hours as they keep moving sand at faraway
work sites. Stay up on the info in TM 5-3805-248-14&P-1 and keep these pointers
in mind.
Cab Filters
Both filter elements for the cab’s air system are located on the roof of the scraper’s
cab. Most of the time, the air system keeps clean air circulating inside the cab, no
matter how dusty the worksite is.
But a loss of fresh air inside the cab is a signal for you to remove the filter ele-
ments to see if they’re clogged with dust and sand. If they are, clean the filter ele-
ments only with low-pressure air.
Vents Open and Close
Make sure the cab vents are closed after the day’s run. That way dust and sand
stay out of the cab.
PS 630
MAY 05
24
Differential Lockout
Using the scraper’s footrest is a great
idea—unless your heel rests against the
differential lockout. Any bump the scraper
hits engages and disengages the differen-
tial. That overpressurizes that transmission
and blows its internal differential seal. End
result: Your scraper is going nowhere!
So use the footrest, but keep your boot
away from the differential.
621B Scraper…
The
Sand-
man
Cometh
Air Tank Reminder
Scorching hot days and cool nights in the desert mean condensation is forming in
the scraper’s air brake system.
Condensation leads to corrosion,
slow stops and brake failure.
After the day’s run, open the
manual draincocks on the two air
tanks near the cab step on the road-
side. Both of these tanks are over-
looked because they’re located
under the cab platform.
Make sure the draincocks are
closed when you finish.
Remove filter
and clean it
Drain air
tanks
Keep heel
off
differential
lockout
Use low-pressure air to clean
cab’s air filter elements
let me into
your filters!
I wanna
glog ‘em up
with
sand!!
no way,
sand-
man!
630.24-25(C)
4/2/05
10:52 AM
Page 1
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