Resources | Parker THC Distributors
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THC Resources

Find the resources you need for your next vocational truck application here. Download the latest literature and get information about upcoming tradeshows where you can see Parker solutions and technologies.


Learn more about Parker's servicesParker's Truck Hydraulics Centers (THC) offer a complete line of Parker products for work truck applications. Our THCs are local, one-stop shops offering on-site service and complete hydraulic, pneumatic components and system coverage. From custom PTO assembly and wetline kits to repair, replacement and complete system design and installation, customers rely on Parker to keep their trucks on the road.

Services offered include:

  • Upfitting Repair
  • On-the-spot hose assemblies
  • Consultations
  • System design

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Featured Work Truck Products

Helpful Formulas

Hydraulic Pumps

GPM = [RPM X CID] / 231 X EFF
CID = [GPM X 231] / RPM
T = [CID X PSI] / 75.36 lbs ft
T = [CID X PSI] / 6.38 lbs inch
T = [HP X 5252] / RPM lbs ft
T = [HP X 63025] / RPM lbs inch
HP = [T X RPM] / 5252 lbs ft
HP = [T X RPM] / 63025 lbs inch


P = F/A
A = F/P
Area of a Circle = D Sq. X .7854

Hydraulic Motors

RPM = [GPM X 231] / CIR
CIR = [GPM X 231] / RPM
T = [CIR X PSI] / 75.36 lbs ft
T = [CIR X PSI] / 6.28 lbs inch

Glossary of Terms

F= Force 
A= Area
P= Pressure 
Eff. = Efficiency
HP = Horse Power
GPM= Gallons Per Minute
PSI = Pressure Per Sq. Inch
RPM= Revolutions Per Minute
231 = Cubic Inches in 1 Gallon
T= torque 
CID = Cubic Inches Displaced per revolution [Pump]
CIR = Cubic Inches Displaced per revolution [Motor]


This expo features the latest innovations and expertise in the fluid power, power transmission & motion control industries.

The Work Truck Show
North America's largest work truck event featuring the latest products, industry-focused training courses, and access to technical engineering representatives from hundreds of exhibiting companies.

Fire and Rescue
World-class instructors, classrooms, workshops, H.O.T. evolutions and exhibits.

Wastewater Equipment Fair (WEQ)
WEQ is an outdoor exhibition of wastewater equipment that allows both manufacturers and operators to get hands-on with sewer cleaning, inspection, vacuum trucks, pumps and other commercial, industrial and municipal equipment.

Waste Expo
The largest waste, recycling and organics tradeshow / conference in North America with over 600 exhibitors plus education, networking and training.


Parker memberships include the International Fluid Power Society, NTEA, and the American Trucking Association

Fluid Power Society

The International Fluid Power Society strengthens and advances professional careers in the fluid power workforce through its work in education, training, and certification.

National Truck Equipment Association
The Association for the Work Truck Industry represents 1,800 companies that manufacture, distribute, install, sell and repair commercial trucks, truck bodies, truck equipment, trailers and accessories.

Technology & Maintenance Council
American Trucking Association is the largest national trade association for the trucking industry. The purpose of the Technology & Maintenance Council is to improve transport equipment, its maintenance and maintenance management.