HWH Corporation
(On I-80, Exit 267 South)
2096 Moscow Road
Moscow, Iowa 52760

Phone: (563)724-3396 or (800)321-3494
Fax: (563)724-3408

Business Hours: 8 a.m. - 5 p.m. Central Time (M-F)

The World's Largest Manufacturer
of RV Leveling & Room Extension Systems
Section 1 - Introduction To Hydraulics

CHAPTER 1 - Introduction to Hydraulics
a) Introduction and overview 1-1

b) Basic hydraulic principles 1-2

  • i) Physical laws 1-2.1
  • ii) Hydraulics terminology 1-2.2
  • iii) Principles of hydraulics 1-2.3

c) Hydraulic calculations and formulas 1-3

  • i) Force-area-pressure formulas 1-3.1
  • ii) Calculation of a piston's surface area 1-3.2

d) Hydraulic system special tools & equipment 1-4

  • i) Basic hand tools 1-4.1
  • ii) Hydraulic pressure gauge 1-4.2
  • iii) Electrical test equipment 1-4.3

e) Basic hydraulic circuit 1-5

CHAPTER 2 - Hydraulic System Components
a) Reservoirs 2-1

b) Plumbing 2-2

  • i) Tubing 2-2.1
  • ii) Hoses 2-2.2
  • iii) Fittings 2-2.3
  • iv) Seals and gaskets 2-2.4

c) Fluids 2-3

  • i) Identifying 2-3.1
  • ii) Filters and screens 2-3.2

d) Pumps 2-4

e) Hydraulic controls 2-5

  • i) Valves 2-5.1
  • ii) Control of pressure 2-5.2
  • iii) Pressure control valves 2-5.3
  • iv) Flow control valves 2-5.4

f) Actuators or cylinders 2-6

  • i) Single acting cylinders 2-6.1.1
  • ii) Double acting cylinders 2-6.1.2

CHAPTER 3 - Basic information for performing hydraulic system maintenance
a) How a hydraulic system works 3-1

  • i) Review of important concepts 3-1.1

b) Schematic symbols 3-2

c) Safety 3-3

  • i) Personal protection equipment 3-3.1
  • ii) Hydraulic systems safety procedures 3-3.2
  • iii) Test pressures vs. materials 3-3.3

d) RV hydraulic leveling systems 3-4

  • i) Necessary cylinder capacity 3-4.1
  • ii) Proper cylinder leg locations 3-4.2
  • iii) Proper mounting height/brackets 3-4.3
  • iv) Proper bracket welding procedures 3-4.4
  • v) Proper bolt on procedures 3-4.5
  • vi) Routing of hydraulic hoses 3-4.6
  • vii) Routing of electrical wires 3-4.7
  • viii) Pump manifold assembly location 3-4.8

e) Hydraulic room extensions 3-5

  • i) Adjustment of room extension cylinders 3-5.1
  • ii) Proper room sealing 3-5.2
  • iii) Cantering of room 3-5.3

f) Bleeding the system 3-6

g) Servicing and maintaining the hydraulic system 3-7

CHAPTER 4 - Trouble shooting RV hydraulic systems

CHAPTER 5 - Glossary of hydraulic terms

TEST