Testing And Adjusting Engine Speed - Komatsu PC130-7 Shop Manual

TESTING AND ADJUSTING
TESTING AND ADJUSTING
ENGINE SPEED
MEASURING
1. Preparation work
1) Turn the starting switch ON and set the mon-
itor panel in the "Monitoring function [02]" to
prepare for measurement of the engine
speed.
a For the operating method, see "Special
functions of monitor panel".
• Monitoring code: 010 (Engine speed)
a The engine speed is displayed in rpm.
2) Warm up the engine to the following operat-
ing condition.
• Engine coolant temperature: Within oper-
ating range
• Hydraulic oil temperature: 45 – 55°C
a Measure the engine speed with the work-
ing mode switch in the A-mode position.
1. Measuring low idling speed
1) Set the fuel control dial in the low idling (MIN)
position.
2) Set the work equipment control, swing con-
trol, and travel levers in neutral and measure
the engine speed.
2. Measuring high idling speed
1) Turn the auto-decelerator switch OFF.
2) Set the fuel control dial in the high idling
(MAX) position.
3) Set the work equipment control, swing con-
trol, and travel levers in neutral and measure
the engine speed.
3. Measuring pump relief speed
1) Set the fuel control dial in the high idling
(MAX) position.
2) Relieve the arm circuit by moving the arm IN
and measure the engine speed.
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(1)

TESTING AND ADJUSTING ENGINE SPEED

4. Measuring pump relief and one-touch power
maximizing speed
1) Set the fuel control dial in the high idling
(MAX) position.
2) Relieve the arm circuit by moving the arm IN,
keeping pressing the one-touch power maxi-
mizing switch, and measure the engine
speed.
a The one-touch power maximizing func-
tion is reset automatically in about 8.5
seconds even if the switch is kept held.
Accordingly, measure the engine speed
in that period.
5. Measuring auto-deceleration speed
1) Start the engine and set the fuel control dial
in the high idling position (MAX).
2) Set the work equipment control, swing con-
trol, and travel levers in neutral and measure
the engine speed.
a The engine speed lowers to a certain
level about 5 seconds after all the levers
are set in neutral. This level is the auto-
deceleration speed.
ADJUSTING
Adjusting governor spring
a If the high idling speed is out of the standard
range or the engine speed is unstable (the
engine hunts), adjust the governor spring with
"Governor adjustment function [03]" of the moni-
tor panel.
a For the adjustment procedure, see SPECIAL
FUNCTIONS OF MONITOR PANEL.
PC130-7