Information and Tips on How Steering Pumps Work
FAQ
What is your warranty period?
One year from date of purchase. Replacement pump or cash back only.
Is there any other helpful installation and pump noise information?
The TRW Truck Steer website has a ton of useful, public domain guidelines.  https://www.trwaftermarket.com/us/products/heavy-duty/service-literature/diagnostics-and-maintenance/
Feel free to surf it a bit.
How does the pump work?
See the attached “THEORY OF A PUMPâ€.
Power Steering System not working or NOISES from Pump or Gear Box?
See the attached “TROUBLESHOOTINGâ€.