Linkage (bent, loose or tight connections).
Steering knuckles, spindles, pins and bushings.
Lack of lubrication (linkage, steering gear, spindles).
Steering gear column (misaligned).
Steering gear adjustment (too tight).
Hard Steering Occurrences and Causes.
Lack of sufficient oil flow.
Low tire pressure.
Too much friction in system (bind, lack of lubrication).
Overload on front wheels.
Existing All The Time. (While driving as well as while parking).
Causes are the same as while parking, but more severe.
Occurring Only Part of The Time.
Air in circuit (interferes with constant pressure and oil flow).
Loose or tight linkage connections.
Improper steering gear adjustment (shim pack on lever shaft). i.
Changes in load, tires, road surface, temperature of oil.
Parts shifting on their mountings to new locations, cab shift, binds.
Noticeable When Trying to Steer Fast.
Lack of sufficient oil flow for the speed of steering attempted (low engine rpm or belt slippage could be the cause).
Occurring In One Direction--Right or Left.
1. Bent cylinder piston rod.
2. Bind in mechanical section.
3. Mechanical interference preventing valve spool travel in one direction (such as jacket tube ends interfering with axial
movement of wheel tube - at steering wheel upper end and at adjusting nut lower end - if valve is integral with steering
4. Off-center adjustment of valve IF the control valve is Ross HP70 type. (Normal spool travels the same in each
Noticeable At Certain Steering Wheel Positions.
Mechanical binding. May be in steering gear adjustment or elsewhere in linkage.
"Lumpy" Feeling. (Momentary spots of hard steering--not smooth).