Brake Circuit
g262079
Brake Circuit Diagram (disengaged)
A hydraulically actuated wet multi-disc brake is installed between the rear axle
motor and the rear axle assembly. When engaged, the brake prevents the rear
axle input shaft from rotating.
The gear pump section furthest from the piston pump, gear pump section (P4),
supplies fluid to a variety of circuits including the brake release. Hydraulic fluid
from gear pump (P4) enters the main manifold port P and flows through the
steering priority valve (EC1); refer to
Steering Circuit (page 5–18)
for a full
explanation of the steering priority valve (EC1) operation. Fluid flow continues
through the flow regulator valve (EC2) where it dead heads at solenoid valve
(SP1). Fluid is also sent to one end of the flow regulator valve (EC2) spool. As
long as circuit flow is blocked at solenoid valve (SP1), the flow regulator valve
(EC2) spool is shifted to direct flow to the traction charge, 2 speed drive motor
control, brake release, differential lock and PTO clutch circuits.
Parking Brake
The brake is automatically engaged by springs inside the brake assembly when
the engine is not running (no hydraulic pressure available). When the engine
is running and the parking brake switch is set to E
NGAGE
position, solenoid
valve (SV2) in the main manifold is de-energized and hydraulic flow bypasses
the brake circuit. The brake remains engaged by the springs inside the brake
assembly. When the engine is running and the parking brake switch is set to
the D
ISENGAGE
position, solenoid valve (SV2) is energized and hydraulic flow
passes through manual valve (MP) to push against the springs in the brake
assembly and disengage the brake.
The parking brake may be disengaged when the engine is not running (no
hydraulic pressure available) if necessary. Refer to
(page 5–4)
for additional information.
Service Brake
The brake will also engage when the decelerator pedal is fully depressed during
vehicle operation. When the vehicle is in operation, the engine is running and
the parking brake switch is in the D
ISENGAGE
position. Solenoid valve (SV2) is
energized and hydraulic flow keeps the brake disengaged. When the decelerator
pedal is fully depressed, solenoid valve (SV2) de-energizes. The hydraulic
pressure trapped in the circuit combined with the springs inside the brake
assembly, shift manual valve (MP) and the allow the brake to engage.
Outcross 9060
Page 5–25
Hydraulic System: Hydraulic Flow Diagrams
18234SL Rev B
Summary of Contents for 07511AA
Page 4: ...Reader Comments Page 4 Outcross 9060 18234SL Rev B ...
Page 18: ...Safety Safety and Instructional Decals Page 1 10 Outcross 9060 18234SL Rev B ...
Page 38: ...Specifications and Maintenance Special Tools Page 2 20 Outcross 9060 18234SL Rev B ...
Page 96: ...Engine Service and Repairs Page 4 24 Outcross 9060 18234SL Rev B ...
Page 208: ...Hydraulic System Service and Repairs Page 5 112 Outcross 9060 18234SL Rev B ...
Page 294: ...Electrical System Service and Repairs Page 6 86 Outcross 9060 18234SL Rev B ...
Page 384: ......