Specifications

Loveland Fire/Rescue
Pumper
Production Specification
SVI #769 Page 102 of 125 June 17, 2010
..\4) Pricing & Change Orders\Production Change Order.pdf
IMPELLERS
The pump impellers shall be bronze, specifically designed for the fire service and accurately balanced for vibration free
running. The stripping edges shall be located on opposite sides of the impellers to reduce shaft deflection.
The impeller shaft shall be stainless steel, accurately ground to size and supported at each end by oil or grease lubricated
anti-friction ball bearings for rigid, precise support. The bearings used on the impeller shaft shall be automotive type
bearings, easily cross-referenced and readily available at normal parts or bearing stores.
FLAME PLATED IMPELLER HUBS
The impeller hubs shall be flame plated with tungsten carbide to a hardness approximately twice that of tool steel to
assure maximum pump life and efficiency. During the flame plating process the base metal shall not be allowed to
exceed a temperature of 300 degrees Fahrenheit to prevent altering the metallurgical properties of the impeller material
MECHANICAL SEALS
The pump shall be equipped with self-adjusting, maintenance free mechanical shaft seals that shall not require manual
adjustment. These seals shall be designed in a manner such that they shall remain functional enough to permit continued
use of the pump in the unlikely event of a seal failure.
IMPELLER WEAR RINGS
The pump shall be equipped with replaceable bronze wear rings for increased pump life and minimum maintenance cost.
The wear rings shall be designed to fit into a groove in the face of the impeller hubs forming a labyrinth that, as the
clearance increases with age, directs water from the discharge side in several directions eventually exiting outward, away
from the eye of the impeller hub.
PUMP CASING
The pump casing shall be cast as two (2) horizontally split pieces. The casing shall be made of high tensile, close-grained
gray iron with a minimum tensile strength of 40,000 PSI.
PUMP TRANSMISSION
The pump transmission shall be of the latest design, incorporating a high strength involute tooth-form Morse Hy-Vo chain
capable of operating at high speeds while providing smooth and quiet transmission of power. Drive and driven sprockets
shall be made of alloy steel with teeth of an involute form. Driveline shafts shall be made from alloy steel forgings,
hardened and ground to size. Deep groove, anti-friction ball bearings shall be used throughout the pump transmission.
The pump shift engagement shall be accomplished by a free sliding collar that uses an internal locking mechanism to
insure that the collar will stay in road or pump position.
Primary lubrication for the pump transmission bearings, sprockets and chain shall be provided by a splash system. A
supplementary pressure system shall also be employed which shall include a strainer, an oil circulation pump driven by
the impeller shaft, and a spray bar inside the case to apply oil to the inside of the chain just before it engages the driven
sprocket.
The pump and transmission shall be easily separable. A two-piece shaft shall be splined allowing for individual repair of
either the pump or transmission, to keep down time to a minimum.
All driveline components shall have a torque rating equal to or greater than the final net engine torque.