Nilfisk-Advance 56507009, Troubleshooting Manual

Page: 32 / 82

32 - FORM NO. 56043129 - SR 1900
STEERING SYSTEM
STEERING SYSTEM TROUBLESHOOTING OVERVIEW
See Figure 1. A hydraulic steering unit, with the steering wheel mounted to it, controls the steer cylinder. The steering unit runs off the auxiliary
pump assembly. The oil flows through a priority divider built into the manifold block assembly that divides the pump output and reduces the oil flow
to 2.0 GPM for the steering system. There is a check valve built into the steering unit that allows for manual steering if there is no hydraulic oil flow
to the unit. The relief valve for the steering system is located in the steering unit and is set to open at 1100 PSI.
Steering System Hydraulic Diagram
TROUBLESHOOTING GUIDE
Problem Possible cause
Slow steering, hard steering or loss of Priority flow divider not providing 2.0 GPM.
Power assist.
1100 PSI relief valve open or
malfunctioning.
Steering wandering. Loose or leaking cylinder piston packing.
Steering control unit worn.
Steering wheel turns freely Problem with steering column
without moving wheel. Shaft or spline.
Steering binding. Steer cylinder loose.
FIGURE 1