Engine And Cooling System; Testing Engine Speed - Komatsu PC88MR-10 Shop Manual

30 Testing and adjusting

Engine and cooling system

Engine and cooling system

Testing engine speed

a Check the engine speed with the monitoring
function of the machine monitor.
a Check this item under the following conditions.
Coolant temperature: 75 to 94°C
Hydraulic oil temperature: 45 to 55°C
Testing
(PC88MR-A000-388-K-00-A)
1. Preparation
Operate the machine monitor so that it can
monitor the engine speed.
a For the machine monitor operating method,
see the section of "Special functions of
machine monitor".
a Monitoring code: 01002 "Engine speed"
2. Testing low idle speed
1) Start the engine, and set the fuel control dial
to low idle (MIN) position.
2) Set all the levers and pedals for work
equipment control, swing control, and travel
in neutral, and test the engine speed.
3. Testing high idle speed
1) Start the engine, and set the fuel control dial
to high idle (MAX) position.
2) Set the working mode in Power Mode (P)
and set the auto-deceleration to OFF.
3) Set all the levers and pedals for work
equipment control, swing control, and travel
in neutral, and test the engine speed.
4. Measuring engine speed at pump relief
1) Start the engine, and operate the arm to the
stroke end where the arm cylinder is fully
extended.
2) Set the fuel control dial to high idle (MAX)
position, and set the working mode to Power
mode (P).
3) Operate the L.H. work equipment control
lever to relieve the arm circuit at the OUT
stroke end, and measure the engine speed.
5. Measuring the engine speed when auto-
deceleration is activated
30-8
(ALL-R401-001-K-00-A)
(PC88MR-A000-360-K-00-A)
1) Start the engine, set the fuel control dial to
high idle (MAX) position, and turn the auto-
deceleration function ON.
2) Set all the levers and pedals for work
equipment control, swing control, and travel
in neutral and test the engine speed when
the auto-decelerator operates.
a The engine speed automatically lowers to a
certain level approximately 5 seconds after
all the levers and pedals are set to
NEUTRAL position. This level is the auto-
deceleration speed.
PC88MR-10