TM 5-2420-230-24-1
Symptom
Possible cause
Remedy
Hydraulic supply pump
Increase engine speed
No power steering on cold
vanes not extending (Vane
momentarily to extend
starting
type pump only)
vanes and start pump
action.
Usually does not happen
often and does not last
long. Not a cause for pump
repair or replacement.
Pinched oil return line
Relocate line
Excessive pump pressure
High back pressure
with steering gear in neutral
position.
Binding steering column
Repair steering column
Relief plungers not adjusted
Adjust relief plungers
Wheel cuts restricted
properly
Insufficient volume of oil
Refer to pump servicing
Erratic steering or
instructions
mechanical steering only
Sticking pressure relief
Repair or replace relief
valve in steering gear
value as required
Loose pump drive belts
Tighten or replace belts
Hard Steering
Faulty supply pump
Check pump flow
Steering out of alignment
Align front end
High operating temperature
Locate and correct cause of
overheating
Dirt or foreign matter
Check piston relief
Wheel turns hard in one or
trapped in piston relief
both directions
Bent or damaged king pings
Repair or replace king pins
and tie rods
and tie rods
Refer to servicing instructions
Front end load too great
Lighten load
Low oil level in steering
Fill oil reservoir as required
system
Air in system
Bleed system and check for
cause of air
Caster degree incorrect
Correct to specifications
Metal or foreign material in
Remove and clean relief
Wheel turns hard in one
relief ball seat in piston of
valve seats or replace
direction
steering gear
damaged parts
Set caster to 3o to 5o
No positive caster
No attempt to return
positive caster
straight ahead from
turns (should also be hard
Steering column bind
Check and repair U-joints
steering complaint)
and support bearings
K-23
