TEXAS CONSTRUCTION EQUIPMENT
TECHNICIAN CERTIFICATION EXAM WITH
ACTUAL QUESTIONS AND VERIFIED
ANSWERS, PLUS EXPLAINED
RATIONALES/EXPERT VERIFIED FOR
GUARANTEED 100% PASS 2026/LATEST
UPDATE/INSTANT DOWNLOAD PDF
1. A construction equipment technician is diagnosing a hydraulic
excavator that has slow boom lift speed, excessive heat in the
hydraulic oil, and a whining pump. Which component should be
inspected first?
A. Swing bearing
B. Hydraulic relief valve stuck partially open
C. Fuel injector
D. Engine thermostat
Answer: B. Hydraulic relief valve stuck partially open
Rationale: A partially open relief valve continuously bypasses hydraulic
fluid back to the reservoir, reducing pressure, generating heat, and
causing pump cavitation noise. This combination of symptoms strongly
indicates a pressure loss through the relief circuit.
2. During preventive maintenance on a crawler dozer, the technician
measures track sag at 90 mm while the manufacturer's
specification is 45–55 mm. What is the most likely consequence if
no adjustment is made?
A. Increased hydraulic pressure
B. Increased risk of track derailment
1
,C. Higher engine compression
D. Reduced alternator output
Answer: B. Increased risk of track derailment
Rationale: Excessive track sag allows the track chain to become loose,
increasing the likelihood of derailment, accelerated undercarriage wear,
and poor machine stability.
3. A Tier 4 Final diesel engine repeatedly enters regeneration mode
every few hours despite normal operation. Which condition is most
likely responsible?
A. Dirty air filter only
B. Excessive soot production due to faulty injector
C. Low coolant level
D. Incorrect tire pressure
Answer: B. Excessive soot production due to faulty injector
Rationale: Poor fuel atomization from a faulty injector increases soot
production, causing the Diesel Particulate Filter (DPF) to load rapidly
and trigger frequent regeneration.
4. Which sensor primarily provides feedback for common rail fuel
injection timing?
A. Coolant temperature sensor
B. Crankshaft position sensor
C. Brake pressure sensor
D. Oil pressure switch
Answer: B. Crankshaft position sensor
2
,Rationale: The crankshaft position sensor provides engine speed and
crank angle information required by the ECU for accurate injection
timing.
5. When pressure-testing a hydraulic cylinder, internal leakage is best
indicated by:
A. High oil viscosity
B. Cylinder drift under load
C. Dirty hydraulic reservoir
D. Excessive fuel consumption
Answer: B. Cylinder drift under load
Rationale: Cylinder drift under a static load commonly results from
worn piston seals allowing oil to bypass internally.
6. Which hydraulic pump delivers a fixed volume of oil for every
revolution regardless of load?
A. Variable-displacement piston pump
B. Gear pump
C. Axial variable pump
D. Load-sensing pump
Answer: B. Gear pump
Rationale: Gear pumps are fixed-displacement pumps, producing a
constant volume per revolution regardless of system demand.
7. A wheel loader exhibits steering hesitation only when hydraulic oil
reaches operating temperature. What is the most probable cause?
3
, A. Low battery voltage
B. Internal leakage within steering control valve
C. Dirty cab air filter
D. Damaged headlights
Answer: B. Internal leakage within steering control valve
Rationale: Hydraulic oil thins as temperature rises, allowing worn valve
clearances to leak internally and reduce steering response.
8. Before disconnecting a hydraulic hose on an excavator, the
technician should first:
A. Increase engine RPM
B. Relieve hydraulic system pressure
C. Disconnect alternator wiring
D. Remove the fuel filter
Answer: B. Relieve hydraulic system pressure
Rationale: Residual hydraulic pressure can cause high-pressure oil
injection injuries. Pressure must always be relieved before opening the
system.
9. What is cavitation in a hydraulic pump?
A. Excessive electrical current
B. Formation and collapse of vapor bubbles
C. Overheating of bearings
D. Water contamination only
Answer: B. Formation and collapse of vapor bubbles
4
TECHNICIAN CERTIFICATION EXAM WITH
ACTUAL QUESTIONS AND VERIFIED
ANSWERS, PLUS EXPLAINED
RATIONALES/EXPERT VERIFIED FOR
GUARANTEED 100% PASS 2026/LATEST
UPDATE/INSTANT DOWNLOAD PDF
1. A construction equipment technician is diagnosing a hydraulic
excavator that has slow boom lift speed, excessive heat in the
hydraulic oil, and a whining pump. Which component should be
inspected first?
A. Swing bearing
B. Hydraulic relief valve stuck partially open
C. Fuel injector
D. Engine thermostat
Answer: B. Hydraulic relief valve stuck partially open
Rationale: A partially open relief valve continuously bypasses hydraulic
fluid back to the reservoir, reducing pressure, generating heat, and
causing pump cavitation noise. This combination of symptoms strongly
indicates a pressure loss through the relief circuit.
2. During preventive maintenance on a crawler dozer, the technician
measures track sag at 90 mm while the manufacturer's
specification is 45–55 mm. What is the most likely consequence if
no adjustment is made?
A. Increased hydraulic pressure
B. Increased risk of track derailment
1
,C. Higher engine compression
D. Reduced alternator output
Answer: B. Increased risk of track derailment
Rationale: Excessive track sag allows the track chain to become loose,
increasing the likelihood of derailment, accelerated undercarriage wear,
and poor machine stability.
3. A Tier 4 Final diesel engine repeatedly enters regeneration mode
every few hours despite normal operation. Which condition is most
likely responsible?
A. Dirty air filter only
B. Excessive soot production due to faulty injector
C. Low coolant level
D. Incorrect tire pressure
Answer: B. Excessive soot production due to faulty injector
Rationale: Poor fuel atomization from a faulty injector increases soot
production, causing the Diesel Particulate Filter (DPF) to load rapidly
and trigger frequent regeneration.
4. Which sensor primarily provides feedback for common rail fuel
injection timing?
A. Coolant temperature sensor
B. Crankshaft position sensor
C. Brake pressure sensor
D. Oil pressure switch
Answer: B. Crankshaft position sensor
2
,Rationale: The crankshaft position sensor provides engine speed and
crank angle information required by the ECU for accurate injection
timing.
5. When pressure-testing a hydraulic cylinder, internal leakage is best
indicated by:
A. High oil viscosity
B. Cylinder drift under load
C. Dirty hydraulic reservoir
D. Excessive fuel consumption
Answer: B. Cylinder drift under load
Rationale: Cylinder drift under a static load commonly results from
worn piston seals allowing oil to bypass internally.
6. Which hydraulic pump delivers a fixed volume of oil for every
revolution regardless of load?
A. Variable-displacement piston pump
B. Gear pump
C. Axial variable pump
D. Load-sensing pump
Answer: B. Gear pump
Rationale: Gear pumps are fixed-displacement pumps, producing a
constant volume per revolution regardless of system demand.
7. A wheel loader exhibits steering hesitation only when hydraulic oil
reaches operating temperature. What is the most probable cause?
3
, A. Low battery voltage
B. Internal leakage within steering control valve
C. Dirty cab air filter
D. Damaged headlights
Answer: B. Internal leakage within steering control valve
Rationale: Hydraulic oil thins as temperature rises, allowing worn valve
clearances to leak internally and reduce steering response.
8. Before disconnecting a hydraulic hose on an excavator, the
technician should first:
A. Increase engine RPM
B. Relieve hydraulic system pressure
C. Disconnect alternator wiring
D. Remove the fuel filter
Answer: B. Relieve hydraulic system pressure
Rationale: Residual hydraulic pressure can cause high-pressure oil
injection injuries. Pressure must always be relieved before opening the
system.
9. What is cavitation in a hydraulic pump?
A. Excessive electrical current
B. Formation and collapse of vapor bubbles
C. Overheating of bearings
D. Water contamination only
Answer: B. Formation and collapse of vapor bubbles
4
