Komatsu PC4000 Manual page 71

Assembly Procedure PC4000
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• Be carefully, make sure that nobody stand by the fan during
function check.
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*(For more information refer to Maintenance Manual.)
PC4000Asrev05
Edition 08/2005
Connect main battery switch and activate electrical system by using
the key switch S1.
Check messages from display.
Check function of electrical system.
Activate swing parking brake by using switch S29 on dash board.
Start engine. Let it run in low idle about 5 min.
Bleed proportional valves of the pilot control. To do this turn the
screw a few turn out until oil comes out. Retighten screw.
Bleed proportional valve of pump regulation system. To do this turn
screw a few turn out until oil comes out. Retighten screw.
Let engine run in high idle.
Check function of engine water cooling fan by disconnecting plug to
solenoid Y136.
Check function of hydraulic oil cooling fan by disconnecting plug to
solenoid Y6a and Y6b.
Bleed track extending system. To do this open both plugs near by
the idler of each side frames. Connect inside a test hose to the test
stud from each track extending cylinder. Drain the out flowing oil
into a suitable container. Let engine run until bubble free oil flowing
out.
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