Operation
12
Owner’s Manual for MWT500 Water Trailer
Draining Water from System
The tank, pump housing, and hoses must be completely
drained under either of the following conditions.
•
Ambient temperature is expected to drop below
32°F (0°C).
•
Unit is being put in storage for long period of time.
Drain the tank, pump housing, and hoses as follows.
1.
Using the trailer jack, lower the front of the trailer
as much as possible.
2.
See
. Open gravity drain bibb. Open
valve 4. Allow water to completely drain from tank
and lower manifold.
3.
Close valve 4.
4.
Using the trailer jack, raise the front of the trailer
until the engine is at a slight angle.
5.
Remove pump housing drain plug. Allow water to
completely drain from pump housing.
6.
Close pump housing drain plug.
7.
Close valves 1, 2, 3, and 4. Remove one upper
manifold end-plug. Remove plug of access hole.
8.
Using an air compressor, blow air into pump
housing. Water remaining in outlet-side of pump
and hose discharges through manifold.
9.
Secure end-cap to upper manifold.
10. Open valve 2.
11. Using an air compressor, blow air into pump
housing.
Water remaining in supply hose to rear spray-bar
discharges through rear spray nozzles.
12. Leave gravity drain bibb open to allow residual
water to drain from tank.
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