Y-4
Y-4
Air Bleeding Procedure 5. Swing control back-pressure valve
2 Elevating
[NOTICE]
Pull out the connector of the AML vent solenoid
Conditions -1 Engine speed : Max. (1900 min ) PTO : ON Swing brake : ON
valve. Move the boom elevating lever fully to the boom lowering side. Keep the above conditions for 30 seconds or more for bleeding. Proceed on the
1. Open the air-bleed plug and rapidly move the
same steps by moving the boom elevating lever to
swing lever repeatedly between left swing and
the boom raising side.
right swing.
3 Telescoping
2. When there are no more bubbles in the oil that
Pull out the connector of the AML vent solenoid
flows out, tighten the plug while the oil continues
valve.
to flow.
Move the boom telescoping lever fully to the retraction side. Keep the above conditions for 30 seconds or more for bleeding. Proceed on the same steps by moving the boom telescoping lever to the boom extension side. 4 Winch (main and aux.) Pull out the connector of the AML vent solenoid valve. Move the winch lever fully to the hoist-up side. Keep the above conditions for 30 seconds or more for bleeding. Proceed on the same steps by moving the winch lever to the hoist-down side.
6. Pilot circuit (hydraulic pilot control valve) [NOTICE] Conditions -1 Engine speed : idling (700 min ) PTO : ON Oil temperature : 50°C (122°F) or higher 1 Swing With the swing brake ON, move the swing lever fully to the right-swing side. Keep the above conditions for 30 seconds or more for bleeding. Proceed on the same steps by moving the swing lever to the left-swing side.
24
WY05-3162E
