Section 4
Low Pressure Water System
20425577
5-2005/Rev 0
4-2
Figure 4-1: Low Pressure Water System with Optional Booster Pump and Water Filter
The filtered water is routed to the booster pump where the pressure is increased to the relief valve
setting, up to a maximum of 120 psi (8 bar). Pressurized water from the booster pump proceeds
to the outlet manifold.
If the booster pump pressure entering the outlet manifold exceeds 125 psi (8.6 bar) a relief valve
opens allowing water to exit through the 1/2-inch drain connection on the bulkhead. It is still
possible to operate the machine; however, excess water will continue to be released through the
drain.
Discharge pressure is displayed on the pressure gauge mounted on the outlet manifold. The
gauge should read approximately 120 psi (8 bar) while the machine is idling. When it strokes, the
pressure drop should be no greater than 30 psi (2 bar). The water pressure range should remain
between 90-120 psi (6-8 bar) during operation.
NOTE
While the intensifier assembly reverses direction, the boosted pressure will
fluctuate slightly above and below the normal setting.
A relief valve built into the booster pump prevents excessive discharge pressure and typically
operates when the machine is in a deadhead condition. The booster pump is factory set to deliver
120 psi (8 bar) with an inlet pressure of 58 psi (4 bar). The pump may require adjustment to
satisfy system requirements.
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