Mobile Belt Loader Model 660 Operation
Operation Manual
Operation - 1 - 8 CD397-Oper
line that returns oil to the hydraulic oil reservoir through ports on the valve manifold assembly.
When the brake pedal is released, pressure is reduced and the spring loaded check valve opens,
allowing hydraulic fluid to return to the hydraulic oil reservoir through ports on the valve manifold
assembly and the return line hydraulic filter.
Hydraulic fluid also flows to the hydraulic steering motor which controls the hydraulic steer cylin-
der.
When the steering wheel position is altered,
pressurized hydraulic fluid enters the steering valve
through port. Depending on the direction of steering input, flow is diverted through ports to the
appropriate side of the steer cylinder through hydraulic lines. Flow out of the steering cylinder
and excess flow coming in through port returns to the manifold via ports. This fluid then exits the
manifold via port. Fluid passes through the return line hydraulic filter before returning to the
hydraulic oil reservoir.
1.4.13.3LiftCylindersandConveyorMotor
Pressurized hydraulic oil not being used by the steering/braking systems bypasses the flow
divider valve and then flows into an adjustable relief valve that allows hydraulic fluid to return to
the hydraulic oil reservoir through port on the valve manifold assembly and the return line
hydraulic filter.
When the two manual levers for the front and back lift cylinders or the motor driven directional
valve are
activated, the upstream adjustable relief valve closes at the set pressure of 1500 psi
(10.34 MPa or 102.07 atm).
The adjustable relief valve, located downstream of th
e front lift cylinder, closes at the set pres-
sure of 900 psi (6.2 MPa or 62.24 atm), keeping the front cylinder from applying excessive down-
wards force.
The two manual levers control the front and rear lift cylinders and the motor driven directional
valve co
ntrols the conveyor hydraulic motor / CBV assembly.
When a manual lever is actuated, the lever mechanically shifts the spool valve
position, porting
fluid to that side of the lift cylinder to be pressurized. Spool Valve movement also opens a chan-
nel for the non-pressurized portion of the lift cylinder
piston to allow unpressurized oil to return to
the hydraulic oil reservoir through port on the valve manifold assembly and the return line
hydraulic filter.
Likewise, when the conveyor motor control valve is actuated
in either direction, its electric sole-
noid shifts the spool valve position, porting fluid to
the forward or reverse side of the conveyor
motor/CBV assembly. Spool valve movement also opens a channel for the non-pressurized por-
tion of the conveyor motor/CBV assembly to allow unp
ressurized oil to return to the hydraulic oil
reservoir through port on the valve manifold assembly and the return line hydraulic filter.
With the manual control levers in their neutral state, the front and rear cylinders are locked in the
current p
osition by load holding valves, located on their respective cylinders.
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