TESTING AND ADJUSTING
MEASURING ENGINE SPEED
MEASURING ENGINE SPEED
A
*
1.
2.
When removing or installing the measuring equip-
ment, be careful not to touch any high tempera-
ture parts.
Measure the engine speed under the following
conditions.
l Coolant temperature: Within operating range
l Hydraulic oil temperature: 45 - 55 C
Install the digital optical tachometer using the instruc-
tions supplied with it.
Start the engine, and measure the engine speed
when it is set to the conditions for measuring.
1) Measuring at low idling and high idling:
Measure the engine speed with the fuel control
dial set to low idling and high idling.
* When measuring at high idling with the work
equipment operated, operate the work equip-
ment lever, but not enough to make the work
equipment move.
* When measuring at high idling with the travel
(power max.) operated, operate the travel le-
ver, but not enough to make the machine
move.
2) Measure the speed at near the rated speed.
i) Set the working mode to the H/O mode.
ii) Set the power max./swift slow-down switch
to the power max. position.
iii) Run the engine at high idling, set the L.H.
knob switch to the ON or OFF position, oper-
ate the arm lever, and measure the speed
when the arm circuit is relieved.
* Measuring speed when work equipment
is operated: L.H. Knob switch OFF
* Measuring speed when travel is oper-
ated: L.H. Knob switch ON
3) Measuring speed at pump relief:
Run the engine at high idling and measure the
engine speed when each pump is relieved.
* For details of the pump to relieve, see the
TABLE OF JUDGEMENT STANDARD
VALUE.
20-24
a
To Next Page
Loading...
Need help?
General
