20-102 PC09-1
TESTING AND ADJUSTING
MEASUREMENT OF ENGINE
ROTATION
★ Engine rotation measuring tool
When installing or removing the measuring
instrument, be careful not to touch a highly
heated portion of the engine.
★ Carry out measuring the engine rotation under
the following conditions.
• Engine cooling water temperature: To be
within the operating range
• Hydraulic oil temperature: To be between 45
– 55°C
1. Open up the engine hood.
2. Remove clamp (1) of the fuel injection piping.
.
3. Install clamp [1] of multi-tachometer A to fuel
injection piping (2).
★ With 2D68E engines, the No. 1 cylinder is
located on the flywheel side. The clamp may be
installed to either of the No. 1 and No.2 cylin-
ders.
Symbol Part No. Part Name
A 799-203-9000 Multi-tachometer
4. Connect clamp [1] to an amplifier and meter [2].
★ Adjust amplifier sensitivity so that a steady
engine rotation may be read out.
5. Start the engine and measure each engine rota-
tion under the following different conditions.
1) ROTATION at low idling
Set the fuel dial to the low idling position and
put all the control levers and pedals to the
neutral position, then measure the rotation.
2) ROTATION at high idling
Set the fuel dial to the high idling position
and put all the control levers and pedals to
the neutral position, then measure the rota-
tion.
3) ROTATION with 1 pump in relief state
Set the fuel dial to the high idling position
and put the arm cylinder in relief state at its
stroke end, then measure the rotation.
4) Rotation with 2 pumps in relief state
Set the fuel dial to the high idling position
and put both arm cylinder and bucket cylin-
der in relief state at their stroke ends simul-
taneously, and then measure the rotation.
MEASUREMENT OF ENGINE ROTATION
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