PTO PUMP SHIFTING PROCEDURE
This pump is driven by a transmission mounted (SAE) PTO, a front-of-engine
crank shaft PTO, or engine flywheel
transmission configuration, the PTO may be either a sliding gear type or "hot shift"
clutch type. This power take-off is normally shifted from within the driver's
compartment. In most cases, if the PTO is driven via a manual transmission, the
truck clutch must be disengaged while shifting the PTO. The PTO should only be
engaged at a low engine rpm, idle up to 1000 rpm maximum. Review and
understand the PTO manufacturer's safety and operating instructions before
attempting operation.
If the apparatus manufacturer has configured the apparatus per NFPA 1901,
Standard for Automotive Fire Apparatus, 2009 Edition, the following sections
apply:
16.10.4 Stationary Pump Driven Through Transmission-Mounted PTO, Front-
of-Engine Crankshaft PTO, or Engine Flywheel PTO – Automatic Chassis
Transmission.
Where the apparatus is equipped with an automatic chassis
transmission, the water pump is driven by a transmission-mounted (SAE) PTO, front-of-
engine crankshaft PTO, or engine flywheel PTO, and the apparatus is to be used for
stationary pumping only with the chassis transmission in neutral, an interlock system shall
be provided to ensure that the pump drive system components are engaged in the pumping
mode of operation so that the pump system can be operated from the pump operator's
position.
16.10.4.1 A "Pump Engaged" indicator shall be provided both in the driving
compartment and on the pump operator's panel to indicate that the pump shift has been
successfully completed
16.10.4.2 An "OK to Pump" indicator shall be provided in the driving compartment to
indicate that the pump is engaged, the chassis transmission is in neutral, and the parking
brake is engaged.
16.10.5 Stationary Pump Driven Through Transmission-Mounted PTO, Front-
of-Engine Crankshaft PTO, or Engine Flywheel PTO – Manual Chassis
Transmission.
Where the apparatus is equipped with a manual chassis transmission,
the water pump is driven by a transmission-mounted (SAE) PTO, front-of-engine crankshaft
PTO, or engine flywheel PTO, and the apparatus is to be used for stationary pumping only
with the chassis transmission in neutral, an interlock system shall be provided to ensure
that the pump drive system components are engaged in the pumping mode of operation so
that the pump system can be operated from the pump operator's position.
16.10.5.1 A "Pump Engaged" indicator shall be provided both in the driving
compartment and on the pump operator's panel to indicate that the pump shift has been
successfully completed
16.10.5.2 An "OK to Pump" indicator shall be provided in the driving compartment to
indicate that the pump is engaged, the chassis transmission is in neutral, and the parking
brake is engaged.
16.10.6 Stationary Pump and "Pump-and-Roll" – Automatic Chassis
Transmission.
Where the water pump is driven by a transmission-mounted (SAE) PTO,
front-of-engine crankshaft PTO, or engine flywheel PTO, and the apparatus is designed to
be used in both the stationary pumping mode and the "pump-and-roll" pumping mode with
the automatic chassis transmission in neutral for stationary pumping and in a road gear for
pump-and-roll pumping, an interlock system shall be provided to ensure that the pump
Prepared by: DWS
Approved by: MCR
Revised by: RJG
Depending on the PTO and
PTO.
1
Revision Date: 04/09/12
1200590 Rev: # A
Date: 17Sep02