Measuring Engine Speed - Komatsu WA250-6 Shop Manual

SEN03836-01

Measuring engine speed

k
Put chocks under the tires securely.
k
When measuring, check that there are no
persons around the machine.
a Measure the engine speed under the following
condition.
Engine coolant temperature:
q
Hydraulic oil temperature:
q
HST oil temperature:
q
1. Measuring engine speed (low idle and high
idle)
1) Referring to "Special function of machine
monitor", select the real time monitoring
function of the service mode.
2) Display "ENG SPEED" from the monitor-
ing items of the machine monitor.
a Monitoring item
C o d e N o . 0 1 0 0 1 : E N G S P E E D
(Engine speed)
3) Start the engine, set it in the measuring
condition, and measure the engine speed.
10
30-110
1
Within operating range
Within operating range
Within operating range
110 Testing and adjusting, Part 1
2. Measuring HST stall speed
1) Referring to "Special function of machine
monitor", select the real time monitoring
function of the service mode.
2) Select the two-item simultaneous monitor-
ing (2 ITEMS) and then enter the following
code numbers directly.
a Monitoring items
[1] Code No.01001: ENG SPEED
(Engine speed)
[2] Code No.04408: HST OIL TEMP
(HST oil temperature)
3) Start the engine.
4) Lower the bucket to near the ground, then
drive the machine forward and thrust the
bucket into the stockpile of soil or rock
(portion a).
5) While running the engine at high idle,
press the accelerator pedal gradually.
When the HST stalls, measure the engine
speed.
a Measure the stall speed 2 – 3 times.
a Do not keep stalling the HST for more
than 20 seconds. Take care that the
HST oil temperature will not exceed
120°C.

Measuring engine speed

WA250, 250PZ-6