05-24-2026, 06:22 AM
Quick update/reminder about my ongoing project.
It’s been many years since I started this journey and I’m starting to bring it all together.
The project will resolve several intertwined problems and challenges.
My 2005 Newell with a Cat 13 ACERT and Allison 4000 transmission.
A single hydraulic pump, VICKERS V20 to supply the ZF Steering Gearbox and Cooling Fan Hydraulic Motor.
FACT: The V20 does not provide the hydraulic system with the needed flow to operate the two components.
Resolution: Split the system. The engine driven VICKERS V20 supplies the ZF Gearbox only.
Add a hydraulic pump for the cooling fan hydraulic motor circuit driven by a transmission mounted PTO.
I’m getting closer to achieving my goal.
The WHY…
In reality, the ZF Gearbox needs a dedicated hydraulic pump (flow) to function “properly”. What is properly? Continuous hydraulic flow irregardless of the wants and needs of a cooling fan circuit… I’m confident the ZF Gearbox performance, the “feel” going straight forward will improve… less hunting…
In reality, the cooling fan blades need to be “pitched” properly to draw air through the radiator stack and provide enough airflow through the engine bay and out the rear hatch to prevent excessive heat buildup. Final blade pitch will be 30° up from the original setting of 20° (due to the limitations of a single hydraulic pump expected to serve two systems).
Theory and Reality… Pain and Suffering… Practical Application…
The $tory of my Journey…
Live and Learn
More to come.
JK
It’s been many years since I started this journey and I’m starting to bring it all together.
The project will resolve several intertwined problems and challenges.
My 2005 Newell with a Cat 13 ACERT and Allison 4000 transmission.
A single hydraulic pump, VICKERS V20 to supply the ZF Steering Gearbox and Cooling Fan Hydraulic Motor.
FACT: The V20 does not provide the hydraulic system with the needed flow to operate the two components.
Resolution: Split the system. The engine driven VICKERS V20 supplies the ZF Gearbox only.
Add a hydraulic pump for the cooling fan hydraulic motor circuit driven by a transmission mounted PTO.
I’m getting closer to achieving my goal.
The WHY…
In reality, the ZF Gearbox needs a dedicated hydraulic pump (flow) to function “properly”. What is properly? Continuous hydraulic flow irregardless of the wants and needs of a cooling fan circuit… I’m confident the ZF Gearbox performance, the “feel” going straight forward will improve… less hunting…
In reality, the cooling fan blades need to be “pitched” properly to draw air through the radiator stack and provide enough airflow through the engine bay and out the rear hatch to prevent excessive heat buildup. Final blade pitch will be 30° up from the original setting of 20° (due to the limitations of a single hydraulic pump expected to serve two systems).
Theory and Reality… Pain and Suffering… Practical Application…
The $tory of my Journey…
Live and Learn
More to come.
JK
Kristi & Jeff King
Bentonville, Arkansas
#744 2005 45’ Newell Coach
ZF Suspension/Rear Axle Steering
CAT-13 ACERT KCB Engine 525HP 1642 ftlbs Torque Cat Compound Turbocharger System Producing 49 psi
Allison HD4000MH Transmission with PTO drive for Second Hydraulic Pump.