Great Plains NTA3007HD Operator Manual - Manual (Page 124)

120 NTA907HD or NTA3007HD
166-207M 04/04/2011
Air Brake Maintenance
Reservoir Draining
Prior to storage, or daily in humid operations, drain water
from the air brake reservoir tank
to prevent rust inside
the tank, and rust contamination of the brake valve sys-
tem.
1. Set the drill hand brakes.
2. Hold the petcock open until no water flows. Close
petcock.
Air Brake Filter Cleaning
Refer to Figure 131 and Figure 132
The air brake system includes filters
on both the sup-
ply and service lines, to trap any debris introduced dur-
ing connection and disconnection.
Clean filters seasonally; more often in dusty conditions.
1. Move the drill to a sheltered area, to prevent unfil-
tered dust from entering the opened air system.
Do not remove the valve system to clean filters. Caps must be
on bottom of filter when removed.
2. Use a 33mm (1 9 ⁄
32
in) open-end or adjustable wrench
to loosen both red filter caps .
Note: There is generally insufficient clearance between
the filters for a socket or box-end wrench.
3. Carefully remove the cap from one filter. Be ready to
catch the filter screen
when it falls free.
Null4.aac:
Handle the filter screen element very gently. Great Plains
offers only complete replacement filters, and not screen ele-
ments.
Note: The inside diameter of the screen is the inlet side.
The screen is entirely welded stainless steel.
4. Using gentle compressed air, or a soft brush and
compatible cleaning fluid, remove debris from the
screen. Dry thoroughly.
5. The cap is a debris sump. Clean it with air, or water
and mild detergent. Clean and inspect the O-ring
.
Dry the cap if wetted.
6. Center the filter screen on the cap. Carefully re-
insert in filter body. Screw cap in, checking for mis-
alignment or binding of filter element. Tighten cap
gently with wrench.
7. Repeat step 3 through step 6 for the other filter.
Null4:
Figure 130
Air Brake Reservoir
29578
1
2
1
2
2
Null4:
Figure 131
Brake Master Cylinder
29584
2
3
3
4
Null4:
Figure 132
Air System Filter Screen
29592
3
4
5
3
2
5