PTO PUMP SHIFTING PROCEDURE
Prepared by: DWS 4 1200590 Rev: # A
Approved by: MCR Date: 17Sep02
Revised by: RJG Revision Date: 04/09/12
For STATIONARY pumping, proceed as follows for pump engagement:
1. Set parking brake.
2. Shift chassis transmission to neutral.
3. Reduce engine speed to idle or below 1000 rpm.
4. Following the PTO manufacturer’s shifting instructions, engage chassis PTO.
The “Pump Engaged” indicator both in the driving compartment and on the
pump operator’s panel will indicate if the pump shift has been successfully
completed. The “OK to Pump” indicator in the driving compartment will indicate
that the pump is engaged, the chassis transmission is in neutral, and the
parking brake is engaged. The “Throttle Ready” indicator at the pump
operator’s panel is now illuminated.
5. Prime the pump (see priming instructions). Primer motor should be engaged
within 2 minutes of PTO engagement. Pump should then prime within 1 minute
of primer operation. If the pump can not be primed within 3 minutes of PTO
engagement, disengage PTO and troubleshoot priming difficulty. Do not run
the pump dry for extended periods of time.
6. Confirm that the “Throttle Ready” indicator at the pump operator’s panel is now
illuminated.
7. Observe discharge pressure gage on panel while advancing vernier throttle, to
ensure that it is indicating pressure. If Pump is not engaged, no pressure will
show.
8. Remember, the vernier throttle has a quick release emergency center button.
If the truck moves, immediately push the center emergency button all the way
in to close throttle.
9. To ensure maximum operational life for the PTO, driveline, and pump
components, increase engine speed to 1000 rpm minimum when the PTO is
engaged and the pump is flowing water. This slight increase in rpm induces a
small load on the drive system. This load will eliminate the system rattle
produced by the clearances in the PTO and pump gears being excited by the
combustion engine power strokes.
To disengage the pump, reduce engine rpm to idle and shift PTO out of gear.
IMPORTANT: Failure to follow proper shifting or operating sequences will result
in premature PTO failure with possible damage to other components
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