Testing Air Boost Pressure - Komatsu ecot3 PC300LC-8 Shop Manual

30 Testing and adjusting

Testing air boost pressure

a Air boost pressure measuring tools
Symbol Part No.
A 1 799-201-2202 Boost gauge kit
1. Open the engine hood.
2. Remove intake air pressure pickup plug (1) (R
1/8).
3. Install nipple [1] of boost gauge kit A and
connect them to gauge [3].
4. Start the engine and keep it running until temper-
ature of the engine coolant and hydraulic oil rise
to the operating range.
PC300, 350-8
Part name
5. Run the engine at middle or higher speed and
drain oil from the hose.
a When draining the oil, open the self seal of
the hose by insert approximately half of the
gauge and hose connection. Repeat opera-
tion until the oil is drained out.
a If Pm kit (A) is available, you may use the air
bleeding coupling (790-261-1130) in that kit.
a If oil is left in the hose, the gauge does not
work. Accordingly, be sure to drain the oil.
6. Measure the air boost pressure at high idle
under the following conditions.
q Working mode: P-mode
Swing lock switch: ON (high pressure relief)
q
q Work equipment, swing and travel: Arm IN
relief position
7. Remove the measurement tools after the
measurement, and make sure that the machine
is back to normal condition.
SEN02625-06
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