2-1
MAC/MTT-OPS-1
26 FEB 2019
SECTION 2
System Description
Contents
WATER TANK (MTT)
The MEGA steel water tank consists of a water
tunnel, primary floor, vertical baffles, bulkheads,
outer skins, internal piping and external piping.
The tank design is patented and known as the
Mega Anti-surge Stabilization System (MASS).
The tank structure is built around and on top of the
tunnel super structure. The tunnel provides
support to the floor plate, pivot structure, baffles
and mounting for the water pump. The floor plates
carries loads while the baffles and bulkheads add
to tank strength and dampen water surges.
External and internal piping is also used to carry
water from the water pump to spray heads, water
cannon, spray bar, hose reel, dump bar and tank
drain.
WATER PUMPS
The unit is configured with different types of water
pumps depending on tank capacity and customer
specifications. These water pumps are very similar
in design. For the purposes of this manual, the M-4
Pump (6 inch inlet & 4 inch outlet) is used to
present component information. The unit may
instead be equipped with an M-4B Pump or a
Berkeley Pump.
M-4 Water Pump
M-4 Water Pump Major Components and
Functions
1. BRACKET – Main frame of the pump that allows a
pump to be bolted to the tanker and provides
the means to direct mount the hydraulic drive
motor.
2. V
OLUTE CASE – A “snail shell” shaped case that
encloses the impeller. It is narrow at the center
and enlarges from there to the discharge area.
3. W
EAR RING – Acts as a bearing surface between
the impeller and volute case. Constructed of
bronze material.
4. I
MPELLER – Rotating wheel attached to the shaft
that accelerates the speed of the water
producing water flow and pressure.
5. S
HAFT SEAL – Confines grease to the inner and
outer bearing area while keeping foreign
material from entering the bearing area and
seals water inside the volute case.
Water Tank (MTT) ......................................................2-1
Water Pumps ...............................................................2-1
Hydraulic Drive Motor .............................................2-2
Cab Control System (Analog) ................................2-4
Cab Control System DiSCS® 2.0 ............................2-5
Cab Control System DiSCS® 1.5 ............................2-13
Water Cannon System .............................................2-20
Spray System ...............................................................2-21
Dump Bar .....................................................................2-22
Hose Reel ......................................................................2-23
Tank Drain ....................................................................2-23
Fire Suppression System .........................................2-23
Water Circulation System .......................................2-24
Suction Loading (If Equipped) ..............................2-24
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