Jacobsen SLF 1880, Technical/Repair Manual

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6C-5
SECTION 6C. STEERING VALVE
GENERAL
The power steering valve uses hydraulic flow produced
by the charge pump within the traction pump. A pres-
sure relief valve located in the traction pump protects
the steering system from pressure damage. The relief
valve is factory set at 1160 psi (7998 kPa).
Power steering is available as long as the engine is
running. The machine can be steered manually without
assistance from the hydraulic system.
REMOVAL
1.Using a portable filtering unit, vacuum pump, or
suitable container, drain the hydraulic oil or install
a vacuum pump on the hydraulic tank fill port.
2.Remove the steering tower cover (Figure 6C-1).
3.Tilt the steering wheel all the way toward the rear of
the machine.
4.Remove the steering wheel cap, nut, and lock
washer (Figure 6C-1).
5.Remove the steering wheel (Figure 6C-1).
6.Tag and remove the hoses from the bottom of the
steering valve. Immediately plug the hoses and
valve to prevent contamination of the hydraulic
system (Figure 6C-1).
7.While supporting the steering valve, remove the
steering valve mounting nuts at the mounting
bracket (Figure 6C-1).
8.Remove the steering valve from the steering tower
(Figure 6C-1).
Figure 6C-1. Steering Valve Removal and Installation
NOTICE
If available, use a portable hydraulic filtering unit to
remove the hydraulic oil from the hydraulic tank.
Place the filtering unit suction hose in the tank and
pump the oil into a clean and sealable container.
If a portable filter is not available, an adjustable vac-
uum pump can be installed on the hydraulic tank fill
port and vacuum applied to prevent leaking during
hydraulic system service and repair.
If a drain pan is used to drain the hydraulic tank, dis-
pose of the hydraulic oil and fill with clean oil when
service or repair is completed.
Steering Valve
Mounting Nuts
6C