Ports Identification; Hydraulic Lines Connections; Proportional Pressure Relief Valve; Air Bleeding - JLG TOUCAN 10E Service And Maintenance Manual

SECTION 7 - HYDRAULICS

Ports Identification

Port 1: Mast and Jib Lift Up/Down
Port 2: Pressure Plug
Port 3: Swing Right
Port 4: Swing Left
Port 5: Steer Left
Port 6: Steer Right

Hydraulic Lines Connections

Figure 7-6. Hydraulic Lines Connections

Proportional Pressure Relief Valve

This two stage spool type proportional relief valve (9) is
controlled by a PWM signal delivered by the master con-
troller. As a function of the electrical control signal, the
pressure relief value changes. When a machine function is
performed, the valve is controlled with a signal corre-
sponding to the appropriate relief pressure.
THE COIL OF THE PROPORTIONAL RELIEF VALVE IS SPECIALLY
DESIGNED FOR PROPORTIONAL CONTROLS APPLICATIONS. DO
NOT INVERT THIS COIL WITH ANOTHER DIRECTIONAL VALVE
COIL. THE VOLTAGE INDICATION ON THE PROPORTIONAL COIL
IS 24 "VADC" AND ITS RESISTANCE VALUE IS 8.8 OHMS.
7-4
AFTER REPLACEMENT OF THE PROPORTIONAL RELIEF VALVE
AND/OR THE PROPORTIONAL COIL, ALL PRESSURE RELIEF
VALUES MUST BE CHECKED AND ADJUSTED ACCORDINGLY.
Refer to Section 9.4 for proper proportional relief valve
adjustment procedure.

Air Bleeding

Air entrapped in the valve pole tube can cause noisy oper-
ation of the valve when relieving the pressure. This can be
due to an insufficient fluid level in the hydraulic reservoir.
Check oil level as previously indicated. This can also
appears after the hydraulic circuit has been serviced.
1. From ground controls, operate a jib lift up movement
till the jib is fully raised.
2. Unscrew and remove the valve coil nut (1).
3. Using a screw driver of appropriate dimension,
loosen the bleeding screw (2) from about 3 turns
(Do not remove the screw).
4. Continue jib operation (with the jib cylinder fully
extended). Once a continuous and regular oil flow
comes out from the valve bleeding orifice, tighten
the bleeding screw.
5. Install coil nut (1).

Flow Directional Valve

This 4-Way, 2-Position Solenoid Valve (10) allows flow
direction change for Steering and Swinging movements.
The coil of the valve is supplied when a RIGHT Steering or
LEFT Swinging movement is controlled.

Steer Valve

This 4-Way, 2-Position Solenoid Valve (11) is supplied
each time a Steering movement is controlled.
– JLG Lift –
Figure 7-7. Air Bleeding
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