DARLEY ZSP, Nstallation, Operation, Maintenance, Repair And Troubleshooting Instructions

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Prepared by: RJG Rev. A
Approved by: WAH Date: 03/16/12
Revised by: WAH Via ECO 11337 Rev. Date: 02/19/2016
1200643.doc
Detailed Specification
Darley ZSP 2500-3000
A Darley model ZSP 2500-3000 GPM single stage shaft driven fire pump shall be provided
and installed.
The pump shall be midship or rear mounted and designed to operate through an integral
transmission. The pump shall be driven by a driveline from the chassis transmission. The
engine, transmission and driveline components shall provide sufficient horsepower and RPM
to enable the pump to meet and exceed its rated performance.
The pump casing shall be manufactured from Class 40 Cast Iron with a minimum tensile
strength of 40,000 PSI. The casing shall be vertically split allowing for access to the impeller
and impeller drive shaft without removing the pump from the vehicle in the event maintenance
is ever required.
The pump shall contain a cored heating jacket feature that, if selected, can be connected into
the vehicle cooling system to protect the pump from freezing in cold climates, and to help
reject engine heat from engine coolant, providing longer life for the engine.
Pump Shaft
The pump shaft shall be precision ground stainless steel. The shaft shall be splined to receive
shaped impeller hubs, for greater resistance to wear, torsional vibration, and torque imposed
by engine, as well as ease of maintenance and repair.
Impeller
The impeller shall be a high strength bronze alloy of mixed flow design, splined to the pump
shaft for precision fit, durability, and ease of maintenance. Impeller shall be vacuum cast
designed for maximum lift and highest capacity. The seal rings shall be renewable, double
labyrinth, wrap around bronze type.
Impeller shaft oil seals shall be constructed to be free from steel components except for the
internal lip spring. The impeller shaft oil seals shall carry a lifetime warranty against damage
from corrosion from water and other fire-fighting fluids.
Impeller shaft mechanical seal primary ring shall be constructed of Silicone Carbide material
with a mating rating material of Carbon. Due to the superior performance and resistance to
failure in the event of “running dry,” tungsten carbide or ni-resist face materials shall not meet
the requirements of the specification. No Exceptions shall be made to this portion of the
specification.
Pump PTO Driven 2 Gear Transmission
The transmission case shall be heavy duty 356T6 cast aluminum. Transmission case shall be
vacuum resin impregnated to seal casting microstructure. A magnetic drain plug shall be
provided. Transmission case shall include a readily accessible lubricant fill port with
combination plug/dipstick for checking and maintaining oil level. Transmission case shall be