SK375-AT3
Steering system
Truck
SPIERINGS MOBILE CRANES USER MANUAL V 0.0
12-3
Nov
2
0
1
4
C
h
a
n
g
e
s
a
n
d
t
y
p
o
g
ra
p
h
ic
a
l
e
rr
o
rs
r
e
s
e
rv
e
d
.
©
2
0
1
4
S
p
ie
ri
n
g
s
M
o
b
ile
Cr
a
n
e
s
–
A
ll r
ig
h
ts
r
e
s
e
rv
e
d
.
12.3.1.
Steering circuits
12.3.1.1.
Steering circuit 1
The steering pump on the diesel engine provides
steering circuit 1
with pressure for activating the
steering box and the steering cylinders on the front steering axle.
The PTO (Power Take Off) on the flywheel housing of the diesel engine provides a.o.
steering circuit 1
with pressure for activating the steering box and the steering cylinders on the front steering axle.
If the pressure of
steering circuit 1
is lost, symbol
No pressure steering circuit 1
appears on the
main
screen
. The
yellow warning light
also becomes active.
The steering house automatically switches to
steering circuit 2
.
12.3.1.2.
Steering circuit 2
The emergency steering pump on the transfer case provides
steering circuit 2
with oil for activating the
steering box. This circuit is independent of the diesel engine and ensures in case of an emergency that
the vehicle remains steerable till it comes to a stop.
When
steering pump 2
becomes active, the steering box disables the activating of the steering
cylinders on the front steering axle. Symbol
Power-assisted steering front steering axles not active
appears on the main screen. The
yellow warning light
also becomes active.
If the pressure of
steering pump 2
is lost, symbol
No pressure steering circuit 2
appears on the main
screen. The
yellow warning light
also becomes active.
The message is active by default if the vehicle stands still (< 5 up to 8 kph (< 3.1 up to 5 mph)),
because of the emergency steering pump not building pressure.
12.3.1.3.
Rear axle steering
CAUTION!
In case a failure in the steering system occurs, ALWAYS contact Spierings Mobile
Cranes. Stop as soon as possible to restore the failure!
CAUTION!
If the air pressure of steering circuit 1 is eliminated, the vehicle remains steerable
until it comes to a standstill.
The vehicle steers considerably heavier by the loss of the power-assisted steering.
Stop as soon as possible to restore the failure.
CAUTION!
If an electrical malfunction occurs, the vehicle remains steerable.
Only the mechanically steered axles can be steered, increasing the turning circle
significantly.
