Service Manual User Manual

Section 9
9-60
9.8.9 Auxiliary Hydraulics Circuit (optional)
The optional auxiliary hydraulic circuit (Fig. 9– 47 and
Fig. 9– 48) functions can be achieved by pressing and
holding the center button on the joystick. Moving the joy-
stick to the left controls auxiliary function in one direction,
usually forward, if the auxiliary device is so designed.
Moving the joystick to the right controls auxiliary func-
tions in reverse, or the opposite direction.
With the center button on the joystick pressed and held,
and the joystick moved to the left, pilot pressure will shift
the auxiliary spool valve, allowing oil to flow from the aux-
iliary spool valve to the male connection of the auxiliary
hydraulic coupler. From the coupler, oil flows to the
attachment, back to the female auxiliary coupler, and to
the auxiliary spool valve, then to the return oil filter and
reservoir.
With the center button depressed and held on the joy-
stick, and the joystick moved to the right, pilot pressure
will shift the auxiliary spool valve, allowing system pres-
sure to flow from the auxiliary spool valve to the female
connection of the auxiliary hydraulic coupler. From the
coupler, oil flows to the attachment, back to the male aux-
iliary coupler, and to the auxiliary spool valve, then to the
return oil filter and reservoir.
Manually Operated Pressure Relief Valve
The optional auxiliary hydraulic circuit contains a manu-
ally operated pressure relief valve (Fig. 9– 46) to facilitate
attaching or detaching the couplers. The purpose of this
pressure relief is to relieve residual pressure trapped in
the auxiliary hydraulic system. Pulling the knob releases
pressure in the auxiliary hydraulic circuit. The valve is
spring-loaded, and the knob will return to its original posi-
tion after being pulled.
Figure 9– 46. The manually-operated release valve,
located at the rear of the frame, is part of the
optional auxiliary hydraulic system.
OS0360
Manually-operated
Release Valve
(for OPTIONAL
Auxiliary Hydraulics)
Model 3606 • Origin 10/99