3-1
MAC/MTT-OPS-1
26 FEB 2019
SECTION 3
Limitations
Contents
WATER PUMP
The following cautions are operational limitations
of Mega water pumps. Failure to heed these
cautions may result in reduced pump life and
severe water pump damage.
• Do not operate the water pump in a dry sump.
Operating the water pump with a dry sump
will result in water pump component damage
and reduced service life.
• Do not engage/disengage the water pump
above LOW IDLE. Engaging/disengaging the
water pump above low idle will result in water
pump component damage and reduced ser-
vice life.
• Limit water pump operation to 2.5 minutes
when in a no-flow condition (not flowing
water through spray heads, dump bar, water
cannon, drain valve or hose reel). Water pump
operation in a no flow condition will cause
overheating of the water pump and damage to
the shaft bearings and seals.
• Avoid any sudden stoppage of water pump
e.g.; disengaging water pump above LOW
IDLE. Stopping water pump suddenly above
LOW IDLE will result in shaft, impeller and drive
motor damage.
Water pump RPM must not exceed the
specifications listed below with engine at HIGH
IDLE. Failure to ensure water pump speed is at or
below specifications will result in reduced spray
system component service life.
If water pump RPM is to out of the desired range,
adjust the water pump hydraulic drive motor flow
control valve to obtain specified RPM.
The suction loading pump has a maximum vertical
lift capability of 8-10 feet. Attempting to pump
water into the tank from a reservoir that is more
than 8-10 feet below the pump station will result
in reduced suction loading performance.
PUMP MODEL RPM
M-4 PUMP 1,900 ± 50
B-4 PUMP 1,950 ± 50
M-4B PUMP 1,950 ± 50
Water Pump...................................................................3-1
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