Chapter 4 – HES (Health, Environment & Safety) Study Guide for Heavy
Equipment
Because of their size. which of the following types of accumulators are not very popular on
heavy equipment? - correct answer ✔✔Weight-loaded
Technician A says that a check valve uses a spool to control fluid flow both ways. Technician B
says that check valves are a type of directional control valve. Who is correct? - correct answer
✔✔Technician B
Technician A says that O-ring face seal fittings are one of the most common fittings on modern
heavy equipment. Technician B says that NPT fittings do not need thread sealant. Who is
correct? - correct answer ✔✔Technician A
Technician A says that SAE 32 will flow better at a given temperature than SAE 10W. Technician
B says that hydraulic fluid must maintain a relatively constant viscosity over a wide temperature
range. Who is correct? - correct answer ✔✔Technician B
Technician A says that you should use two wrenches when installing hydraulic fittings.
Technician B says that sharp bends in hydraulic hoses are fine because hydraulic fluid can go
through restrictions without a problem. Who is correct? - correct answer ✔✔Technician A
What is the most commonly used viscosity of hydraulic oil? - correct answer ✔✔ISO 32
What size single braid hydraulic hose has the highest pressure rating? - correct answer ✔✔1/4"
Which of the following are functions of the hydraulic reservoir? - correct answer ✔✔All of the
above
Equipment
Because of their size. which of the following types of accumulators are not very popular on
heavy equipment? - correct answer ✔✔Weight-loaded
Technician A says that a check valve uses a spool to control fluid flow both ways. Technician B
says that check valves are a type of directional control valve. Who is correct? - correct answer
✔✔Technician B
Technician A says that O-ring face seal fittings are one of the most common fittings on modern
heavy equipment. Technician B says that NPT fittings do not need thread sealant. Who is
correct? - correct answer ✔✔Technician A
Technician A says that SAE 32 will flow better at a given temperature than SAE 10W. Technician
B says that hydraulic fluid must maintain a relatively constant viscosity over a wide temperature
range. Who is correct? - correct answer ✔✔Technician B
Technician A says that you should use two wrenches when installing hydraulic fittings.
Technician B says that sharp bends in hydraulic hoses are fine because hydraulic fluid can go
through restrictions without a problem. Who is correct? - correct answer ✔✔Technician A
What is the most commonly used viscosity of hydraulic oil? - correct answer ✔✔ISO 32
What size single braid hydraulic hose has the highest pressure rating? - correct answer ✔✔1/4"
Which of the following are functions of the hydraulic reservoir? - correct answer ✔✔All of the
above
