Bendix Commercial Vehicle Systems C-300N HYDRAULIC POWER STEERING1/99 - Manual (Page 30)

30
TROUBLESHOOTING CHART
SYMPTOM CAUSE REMEDY
1. Power steering does not 1. Low oil level. 1. Check oil level.
operate or manual steering
effort is excessive.
2. Air in system. 2. Check that there are no leaks,
bleed and top up with oil.
3. The pressure pump does not supply 3. Check pump performance to
an adequate flow or pressure. specification.
4. Obstruction in the oil reservoir 4. Remove lines and clean.
outlet or inlet.
5. Internal leakage in power 5. Verify by test and repair
steering gear piston. as necessary.
6. Mechanical faults in vehicle 6. Overhaul and test in accordance
steering members not belonging with vehicle service manual.
to power steering gear.
7. Low pressure in front tires. 7. Inflate tires to correct pressure.
8. Relief valve opens at low pressure. 8. Verify by test & repair as
necessary.
2. Steering effort greater in 1. Low or no pressure applied to one 1. Verify be test and repair as
one direction than in the side of power steering piston. necessary.
other.
2. Faulty operation of the rotary valve. 2. Replace piston and spindle
assembly.
3. Mechanical fault in vehicle steering3. Overhaul and check in
members not belonging to power accordance with vehicle service
steering units. manual.
3. Power steering tends to 1. Faulty rotary valve. 1. Replace piston &spindle assembly
turn by itself when
engine is running.
4. Excessive free play in 1. Power steering housing or housing 1. Retighten mounting bolts.
steering wheel. support loose.
2. Excessive play between output shaft 2. Adjust gear lash. If all adjustment
sector teeth and piston. has been used, replace output
shaft and spindle assembly.
3. Loose or worn ball studs in steering3. Mechanical faults in vehicle
linkage. Loose or worn intermediate steering members. See vehicle
steering shafts. manual.
5. Power steering operates 1. Dirty oil. 1. Change oil.
normally but is 2. Low oil level. 2. Check oil level.
intermittently hard. 3. Faulty operation pressure pump. 3. Check pump to performance
specification. Overhaul by
authorized workshop if required.
6. Oil leaks 1. Hose or hose connections. 1. Tighten or replace.
2. Faulty or incorrectly installed 2. Clean & dry the outside of the
seal rings. power steering body and take the
vehicle out on test to locate the
leak.