Download Tech Tip Book.pub - Bab Steering Hydraulics

OVERSTEERING OR DARTING
a. Dry fifth wheel or poor finish on fifth wheel or trailer plate
b. Front end components binding or loose
1. King pins
2. Drag link
3. Tie rod ends
4. Spring shackle or pins
5. Out of spec, toe
6. Out of spec, caster
c. Rear suspension loose or out of track
d. Steering column binding
1. Steering gear improperly adjusted
2. Steering gear control valve spool or sleeve binding
3. Steering gear mounting bent or distorted
4. Steering u joints worn or frozen
5. Steering column mast jagged, bearings, or misaligned
e. Steering column binding every 90 or 180
1. Worn or frozen u joint cap
2. Dry slip yoke shaft
3. Dry slip yoke and/or u joints out of phase
4. Bent steering shaft
HARD STEERING IN ONE DIRECTION
a. Control valve malfunction
NOTE: Steering column slip yoke dry worn or bottom out
b. Loose fan belt, stalling belt on pulley (Will only occur when flow is on input shaft
side)
c. Low pressure (one in a million)
d. Internal leakage in steering gear or steering cylinder (Verify with internal leakage
test)
e. Excessive caster split (hard pull when driving)
f. Overload on front axle
HARD STEERING EFFORT IN BOTH DIRECTIONS
a.
b.
c.
d.
Low tire pressure
Overload on front axle
Hydraulic fluid level low
Low flow or no flow (Install test loop, check flow and pressure of pump and internal
leakage steering gear test)
e. Frozen king pin, drag link, tie rod end, u joint on steering column
f. Restriction in return line, suction line, pressure line, filter clogged, or a too small diameter of hose or fitting.
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