Manitowoc Shuttlelift CD5515-2 Service And Maintenance Manual

GROVE Published 1-20-2017, Control# 483-02 10-1
CD5515-2/YB5515-2 SERVICE MANUAL STEERING SYSTEM
10
SECTION 10
STEERING SYSTEM
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
Steering Modes. . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
Two-Wheel Steering . . . . . . . . . . . . . . . . . . . . . . 10-1
Four-Wheel Steering. . . . . . . . . . . . . . . . . . . . . . 10-4
Crab Steering . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4
Steering Proximity Switches . . . . . . . . . . . . . . . . 10-7
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-7
Principle Of Operation . . . . . . . . . . . . . . . . . . . . 10-7
Sensor Operation and Spacing Checks. . . . . . . . 10-9
Steering Orbitrol . . . . . . . . . . . . . . . . . . . . . . . . . 10-12
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-12
Orbitrol Repair . . . . . . . . . . . . . . . . . . . . . . . . . . 10-13
Steering Cylinder. . . . . . . . . . . . . . . . . . . . . . . . . 10-24
Technical Data. . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
Cylinder Repair . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
DESCRIPTION
General
The main components of the steering system are the
hydraulic pump Figure 10-1, the priority flow control valve,
the load sensing steering orbitrol, hydraulic tank, one front
steering cylinder, two rear steering cylinders and the steering
select valve.
When the steering wheel is turned, a pressure demand is
sensed by the priority flow control valve through load sensing
line between the priority flow control valve and the flow
sensing steering orbitrol.
Oil from the hydraulic pump is then distributed through the
priority flow control valve and a check valve to the steering
orbitrol.
When a turn is made, oil is distributed from the steering
orbitrol directly through the steering select valve and/or to
the steering cylinders.
When the steering orbitrol is neutral, the load sense signal is
ceased, full pump flow is then distributed to the outrigger and
brake circuits through the priority flow control valve.
Maximum steering system pressure is controlled by a relief
valve in the priority flow control valve.
Steering Modes
The crane can be operated in three steering modes. These
modes are selected using the steering selector switch
located to the left of the operator on the instrument panel.
The three modes are:
• Two-wheel steering
• Four-wheel steering
• Crab steering
Two-Wheel Steering
During two-wheel steering, the front wheels steer in the
same direction that the steering wheel turns. The rear
wheels remain in a fixed forward position.
When turning to the right Figure 10-2, hydraulic oil under
pressure from the pump flows through the priority flow
control valve to the P port of the brake/steering manifold on
to the steering orbitrol in the operator’s compartment. When
the steering wheel is turned to the right, hydraulic fluid is
directed through port R of the steering orbitrol to port P of the
steering select valve. The steering select valve has four
solenoid valves. These valves are activated by the steering
select switch in the operators compartment. When the
steering select switch is placed in the two-wheel steering
mode solenoid A is actuated. Oil passes through the porting
of the valve block to the base end of the front axle steering
cylinders. The pistons move to the left, extending the left
cylinder rods and retracting the right cylinder rods, creating a
right turn. Return oil from the steering cylinders flows into
port L, out of port T of the steering orbitrol and back to tank.
Reference Only

Manitowoc Shuttlelift CD5515-2 Specifications

General

Brand	Manitowoc
Model	Shuttlelift CD5515-2
Category	Construction Equipment
Language	English