HomeMy WebLinkAbout303.012 - PTO Auxiliary Pumps
Effective Date: December 2015 Robert J. Garcia, Engineer
Current Revision Date: 05/27/2025 Section 303.012
Next Revision (1) Date: 05/27/2027 Page 1 of 2
Fresno City Fire Department
300 Training and Equipment Manual
SECTION 303.012 PTO AUXILIARY PUMPS
PURPOSE
The purpose of this policy is to define the purpose and function of Power-Take-Off
(PTO) driven auxiliary pumps.
APPLICATION
Hale CBP PTO auxiliary pumps are specifically designed for pump-and-roll
operations. Although an auxiliary pump will function while the apparatus is stationary,
this practice is discouraged.
OPERATIONAL POLICY
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OPERATIONAL GUIDELINE
Refer to the reference section.
PROCESS
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INFORMATION
Engine apparatus are plumbed to pressurize a dedicated discharge manifold,
separated from the main discharge manifold by a clapper or check valve. This
“dedicated/foam” discharge manifold is designed to supply foam to small-diameter
hoses without allowing foam to travel through the tank-fill line to the water tank.
Effective Date: December 2015 Robert J. Garcia, Engineer
Current Revision Date: 05/27/2025 Section 303.012
Next Revision (1) Date: 05/27/2027 Page 2 of 2
Relief Valve Operations
Because of how auxiliary pumps are plumbed, the adjustable relief valves/pressure
governors for our main pumps will not work to control auxiliary pump pressures. On
most of the FFD apparatus, a simple spring-loaded relief valve will dump water onto
the ground when pressures exceed the pre-set values. Smeal 2015 - 2020 apparatus
are equipped with a dedicated adjustable relief valve that circulates excess pressure
back to the auxiliary pump intake -- the same principle used with the main pump relief
valve system. 2022 and newer engines are equipped with an internal relief valve that
is set at 250 psi. It is tested by the shop during pump test each year and any issues
that arise should be directed to the shop.
The PTO driven pump has a power curve shown to produce 250 gpm. Keep this in
mind when selecting attack lines to place into service.
Operation manual
Drawing
Gear box position
DEFINITIONS
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CROSS-REFERENCES
• Training and Equipment Manual
Section 313.015, Pump and Roll