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HEAVY TRUCK STEERING AND SUSPENSION Michigan Mechanic Study
Guide – Original Questions with Answers & Rationales
SECTION 1: Steering System Fundamentals (Questions)
1. Which component connects the steering gearbox to the
steering knuckles?
A. Pitman arm
B. Tie rod
C. Drag link
D. Steering shaft
Answer: B
Rationale: Tie rods connect the steering gear (via center
link or rack) to the steering knuckles, transmitting
steering force to the wheels. Drag link connects pitman
arm to steering arm in recirculating ball systems.
2. In a recirculating ball steering gear, what component
transfers motion from the pitman arm to the steering arm?
A. Tie rod
B. Drag link
C. Idler arm
D. Center link
Answer: B
Rationale: The drag link connects the pitman arm (output
of gearbox) to the steering arm on the knuckle, allowing
left-right movement.
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3. What is the purpose of the idler arm?
A. Supports the pitman arm
B. Supports the opposite end of the center link
C. Connects tie rods to wheels
D. Provides power assist
Answer: B
Rationale: The idler arm supports the center link on the
passenger side, mirroring the pitman arm's function to
keep steering linkage level.
4. Power steering fluid is typically what type?
A. DOT 3 brake fluid
B. Automatic transmission fluid or dedicated power
steering fluid
C. Engine oil
D. Gear oil
Answer: B
Rationale: Most heavy truck power steering systems use
ATF or manufacturer-specified power steering fluid. Using
wrong fluid can damage seals and pump.
5. A driver complains of excessive steering wheel play. Which
component is most likely worn?
A. Steering shaft U-joint or gearbox
B. Brake pads
C. Shock absorber
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D. Leaf spring
Answer: A
Rationale: Excessive play often results from worn steering
shaft U-joints, gearbox sector shaft, or loose linkage.
Check for wear and adjust gearbox if applicable.
6. The pitman arm is splined to which shaft?
A. Input shaft
B. Sector shaft
C. Worm shaft
D. Steering column
Answer: B
Rationale: The pitman arm attaches to the sector shaft of
the steering gearbox, converting rotary motion to linear
movement of the drag link.
7. In a rack-and-pinion steering system (used on some lighter
trucks), what component replaces the center link and tie
rods?
A. Drag link
B. Inner and outer tie rods
C. Pitman arm
D. Idler arm
Answer: B
Rationale: Rack-and-pinion uses inner and outer tie rods
, https://www.stuvia.com/user/performance
connected directly to the rack, eliminating center link and
idler arm.
8. What type of steering is most common on heavy trucks?
A. Rack-and-pinion
B. Recirculating ball
C. Electronic steer-by-wire
D. Articulated steering
Answer: B
Rationale: Heavy trucks use recirculating ball steering
gear for high load capacity and durability. Rack-and-
pinion is lighter vehicles.
9. The steering column intermediate shaft contains what
components to allow for cab movement and vibration?
A. Solid rod only
B. Universal joints and slip joint
C. Rubber bushings only
D. None; it is rigid
Answer: B
Rationale: The intermediate shaft has U-joints and a
collapsible or slip section to accommodate cab-to-frame
flex and safety in collisions.
10. Power steering pump pressure is regulated by:
A. Flow control valve or pressure relief valve
B. Thermostat
HEAVY TRUCK STEERING AND SUSPENSION Michigan Mechanic Study
Guide – Original Questions with Answers & Rationales
SECTION 1: Steering System Fundamentals (Questions)
1. Which component connects the steering gearbox to the
steering knuckles?
A. Pitman arm
B. Tie rod
C. Drag link
D. Steering shaft
Answer: B
Rationale: Tie rods connect the steering gear (via center
link or rack) to the steering knuckles, transmitting
steering force to the wheels. Drag link connects pitman
arm to steering arm in recirculating ball systems.
2. In a recirculating ball steering gear, what component
transfers motion from the pitman arm to the steering arm?
A. Tie rod
B. Drag link
C. Idler arm
D. Center link
Answer: B
Rationale: The drag link connects the pitman arm (output
of gearbox) to the steering arm on the knuckle, allowing
left-right movement.
,https://www.stuvia.com/user/performance
3. What is the purpose of the idler arm?
A. Supports the pitman arm
B. Supports the opposite end of the center link
C. Connects tie rods to wheels
D. Provides power assist
Answer: B
Rationale: The idler arm supports the center link on the
passenger side, mirroring the pitman arm's function to
keep steering linkage level.
4. Power steering fluid is typically what type?
A. DOT 3 brake fluid
B. Automatic transmission fluid or dedicated power
steering fluid
C. Engine oil
D. Gear oil
Answer: B
Rationale: Most heavy truck power steering systems use
ATF or manufacturer-specified power steering fluid. Using
wrong fluid can damage seals and pump.
5. A driver complains of excessive steering wheel play. Which
component is most likely worn?
A. Steering shaft U-joint or gearbox
B. Brake pads
C. Shock absorber
,https://www.stuvia.com/user/performance
D. Leaf spring
Answer: A
Rationale: Excessive play often results from worn steering
shaft U-joints, gearbox sector shaft, or loose linkage.
Check for wear and adjust gearbox if applicable.
6. The pitman arm is splined to which shaft?
A. Input shaft
B. Sector shaft
C. Worm shaft
D. Steering column
Answer: B
Rationale: The pitman arm attaches to the sector shaft of
the steering gearbox, converting rotary motion to linear
movement of the drag link.
7. In a rack-and-pinion steering system (used on some lighter
trucks), what component replaces the center link and tie
rods?
A. Drag link
B. Inner and outer tie rods
C. Pitman arm
D. Idler arm
Answer: B
Rationale: Rack-and-pinion uses inner and outer tie rods
, https://www.stuvia.com/user/performance
connected directly to the rack, eliminating center link and
idler arm.
8. What type of steering is most common on heavy trucks?
A. Rack-and-pinion
B. Recirculating ball
C. Electronic steer-by-wire
D. Articulated steering
Answer: B
Rationale: Heavy trucks use recirculating ball steering
gear for high load capacity and durability. Rack-and-
pinion is lighter vehicles.
9. The steering column intermediate shaft contains what
components to allow for cab movement and vibration?
A. Solid rod only
B. Universal joints and slip joint
C. Rubber bushings only
D. None; it is rigid
Answer: B
Rationale: The intermediate shaft has U-joints and a
collapsible or slip section to accommodate cab-to-frame
flex and safety in collisions.
10. Power steering pump pressure is regulated by:
A. Flow control valve or pressure relief valve
B. Thermostat
