Great Plains NTA3007 Operator Manual - Manual (Page 141)

Great Plains Manufacturing, Inc. Table of Contents Index Maintenance and Lubrication 137
2012-07-02 Table of Contents Index 166-371M
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
system.
1. Chock the wheels.
2. Hold the petcock open until no water flows. Close
petcock.
Air Brake Filter Cleaning
Refer to Figure 142 and Figure 143
The air brake system includes filters
on both the
supply and service lines, to trap any debris introduced
during connection and disconnection.
Clean filters seasonally; more often in dusty conditions.
1. Move the drill to a sheltered area, to prevent
un-filtered 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 33 mm (1
9 ⁄
32
inch) 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.
Handle the filter screen element very gently. Great Plains
offers only complete replacement filters, and not screen
elements.
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. Centre 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.
Figure 141
Air Brake Reservoir
29578
1
2
1
2
2
Figure 142
Brake Master Cylinder
29584
2
3
3
4
Figure 143
Air System Filter Screen
29592
3
4
5
3
2
5