Operator`s manual

3.3 HYDRANT MODE
Water is introduced into the pump by two 2-1/2" hydrant valves (9), located on the Pump Control Panel.
Water may also be introduced to the Water Tower by a second pumper through the two valves (8) located
at the rear of the truck. The panel intakes are Hale valves and are described, along with the pump, in the
HALE pump manual. The two rear valves are similar in operation and are built by Thibault. For a parts
breakdown of the Thibault valves refer to Figure 3-2.
Water pressure is controlled by the pressure relief valve described in the Hale manual.
Water is discharged through the 2-1/2" ball valves (10), two to each side of the truck, and the 1-1/2" ball
valves (38) located on top of the truck over the Pump Control Panel. These valves are described in detail
in the Hale manual.
Water from the pump can be diverted to the Water Tower by operating the 3" ball valve (6) and the 4"
butterfly valve (37). Water passes from the pump through the 3-1/2" galvanized pipe (30) through the slip
joint (24), thence through the Ladder Section Water Pipe Assembly (31), (32) and (33) to the Nozzle
Assembly (35). Water may be introduced directly to the Water Tower through the rear intake valves (8).
If the external source pressure exceeds 200 lbs., the relief valve (14) will dump the excess pressure. For
details of the Thibault Central Joint Assembly (24), the Water Joint Assembly (23) and the Nozzle
Assembly (35) refer to Figures 3-5, 3-4 and 3-9.
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