HIGH
FUEL
CONSUMPTION
Perform the following diagnosis before troubleshooting, and take action if required.
1. When did it start? (When a new vehicle was purchased, recently, since it became cold, etc.)
2.
Compared to what? (Previously used forklifts, other vehicle of the same type, other forklifts, etc.)
3.
What is it being used for? (Loading and unloading cargo, transportation, in confined spaces, driving
distance, etc.)
4.
Others. (Fuel, tires, specification additions, work time ranges, changes in cargo, operator
replacements, etc.)
Causes of
high fuel
consumption
1. Engine structure (compression ratio, combustion improvement, cooling loss,
mechanical efficiency, etc.)
2.
Vehicle structure (vehicle weight, tires, drive system transmission efficiency, gear
ratio, etc.)
3.
Use environment conditions (weather, driving environment, loading environment,
driving method, altitude, etc.)
4.
Engine and vehicle maintenance conditions (injection timing, compression pres-
sure, etc.)
5.
Differences in specifications, supplied equipment (mast height, attachments, air
conditioning)
1
1. lnjection pump
I
Areas for inspection or adjustment when the fuel consumption increases
Fuel
Classification
1
2.
Fuel system leak
I
Main inspection or adjustment areas
1
3.
lnjection timing
I
/
I.
Valve
I
Compression
2.
Piston ring
Drive
/
1.
Manual clutch slip
1
2.
Torque converter one-way clutch slip
I
I
1.
Braking drag
I
Brakes
1
2.
Brake automatic adjustment mechanism
I
1
3.
Brake shoe return mechanism
I
[Point
I]
When the engine coolant temperature is too high or too low, the optimum combustion cannot be attained
and the fuel consumption increases.ln particular, repeated driving and loading operations while the engine
is cold leads to incomplete combustion and results in lower engine output.
Cooling
1. Thermostat
2.
Coolant temperature
[Po
i
n
t
11
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