Troubleshooting, Hydrostatic Steering - Taylor-Dunn TC-030-60L Operation, Maintenance, And Replacement Parts Manual

Maintenance, Service, and Repair

TROUBLESHOOTING, HYDROSTATIC STEERING

The cause of most steering problems can be identified by the symptoms. The entire steering system must be analyzed by a
qualified technician before any components are removed. Use the following chart to identify probable cause of steering problems.
Symptoms:
Slow or difficult Steering.
Loss of Power Assist.
Wandering:
Vehicle Will Not Hold a Straight Line.
Drifting:
Vehicle Pulls to the Left or Right.
Slipping:
Slow Rotation of Steering Wheel Will
Not Turn Vehicle.
Intermittent Hard Steering or
Steering Wheel Locks Up.
After lock, Steering Wheel May Spin
Free With No Steering Action.
Erratic Steering.
Soft or Spongy Steering.
Rotation of Steering Wheel Does Not
Turn Vehicle.
No Resistance in Steering.
Rotation of Steering Wheel does not
Turn Vehicle.
Slight resistance Felt When Steering.
Excessive Free Play at Steering Wheel.
Excessive Free Play at Steered Wheels.Faulty steering linkage.
Binding or Poor Centering of
Steering Wheel.
Steering Unit Locks Up.
Steering Wheel Moves by Itself.
Vehicle Steers in Wrong Direction.
Steering Wheel "Kicks Back" at
Start of Steering.
Instability / Hoses Jump.
Steering Components
Page 4
Possible Cause:
Worn or faulty pump.
Faulty flow divider.
Faulty relief valve.
Faulty steering linkage.
Overloaded steer axle.
Air in system.
Steering control unit worn.
Faulty steering linkage.
Faulty steering cylinder.
Front end out of alignment.
Steering control unit worn.
Faulty steering linkage.
Front end out of alignment.
Faulty steering control unit.
Faulty steering cylinder.
Thermal shock
Air is system.
Faulty steering cylinder.
Damage due to thermal shock.
Sticking flow control spool.
Air in system.
Low fluid level
Broken steering column
No fluid in steering control unit.
Faulty steering control unit.
Faulty steering cylinder.
Loose steering wheel.
Faulty steering column
Leaking cylinder seals.
Faulty steering column.
High back pressure in return line.
Debris in the fluid.
Debris in the fluid.
Low pump pressure.
Damage due to thermal shock.
Worn or broken pin.
Parts assembled incorrectly.
Improper timing in steering unit.
Hydraulic hoses not connected properly.
Hydraulic hoses not connected properly.
Inlet check valve missing.
Air in system.
Repair Procedure:
Inspect power steering pump for proper operation.
Flow divider is in the brake Hydro-Boost assembly. If the flow
divider is not functioning correctly then replace the
HydroBoost.
Replace the relief valve.
Inspect steering linkage and steering knuckles for binding.
Locate cause of air bleed and repair. Add oil to reservoir.
Replace the control unit.
Inspect steering linkages for loose fittings.
Inspect the steering cylinder.
Realign front end.
Replace the control unit.
Inspect steering linkages for loose fittings.
Realign front end.
Replace the control unit.
Inspect the steering cylinder internal seals.
Thermal shock can occur if the system is operated for an
extended period without turning the steering wheel. In this
situation, there may be an large temperature differential
between the fluid in the system and the fluid in the steering
control unit. If the steering wheel is turned quickly, the
steering may temporarily seize and could be followed with a
free wheeling steering wheel. Thermal shock could damage
the steering control unit.
Locate cause of air bleed and repair. Add fluid to reservoir.
Inspect and repair or replace cylinder.
Replace control unit.
Replace flow control valve.
Locate cause of air bleed and repair. Add fluid to reservoir.
Add fluid to reservoir.
Inspect the steering column assembly.
Start the steering pump. If this does not correct the problem
then inspect the steering pump for proper operation.
Replace the steering control unit.
Inspect the steering cylinder internal seals.
Inspect the steering wheel nut.
Inspect the steering column assembly for loose or worn
components.
Inspect the steering linkages for loose components.
Inspect the steering cylinder internal seals.
Inspect steering column components.
Inspect fluid return line for obstructions.
Flush the system and clean the steering control unit.
Flush the system and clean the steering control unit.
Inspect the power steering pump for proper operation.
Replace the steering control unit.
Replace the steering control unit.
Reassemble properly.
Reassemble properly.
Reconnect hoses properly.
Reconnect hoses properly.
Install the check valve.
Locate cause of air bleed and repair. Add fluid to reservoir.
Model B4XT-2500