Great Plains NTA2007HD Operator Manual - Manual (Page 125)

Great Plains Manufacturing, Inc. Contents Index Maintenance and Lubrication 121
04/04/2011 Contents Index 166-283M
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 cart hand brakes.
2. Hold the petcock open until no water flows. Close
petcock.
Air Brake Filter Cleaning
Refer to Figure 113 and Figure 114
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.
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: anchors: table image
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.
System Contamination Risk
Do not remove the valve system to clean filters. Caps must
be on bottom of filter when removed.
Equipment Damage Risk:
Handle the filter screen element very gently. Great Plains
offers only complete replacement filters, and not screen
elements.
1
2
Null4:
Figure 112
Air Brake Reservoir
31227
1
2
4
4
5
Null4:
Figure 113
Air Brake Filters
31377
5
6
Null4:
Figure 114
Air System Filter Screen
29592
5
6
7
5
4
7