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Page Title:
Figure 7-11. Table of Steering System Operational Tests (Sheet 2 of 2) |
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 TM 10-3930-623-34
Test For
Probable Cause
Remedy
Gear noise (hissing sound)
There is some noise in all power
Do not replace valve unless "hiss" is
steering systems. One of the most
extremely objectionable. Slight hiss is
common is a hissing sound most
satisfactory and in no way affects steer-
evident at standstill parking. There
ing. A replacement valve may also
is no relationship between this noise
exhibit slight noise and is not always a
and performance of the steering.
cure for the objection.
"Hiss" may be expected when
steering wheel is at end of travel
or when slowly turning at standstill.
Excessive wheel kickback
Lash in steering linkage.
Adjust parts affected.
or loose steering
Excessive lash between steering
Adjust to specification.
arm shaft sector and ball nut.
Loose thrust bearing adjustment.
Remove gear and adjust.
Ball nut and worm preload
Remove rack-piston and worm
and change balls to obtain
specified preload.
Hard steering when parking
Low ail level in reservoir.
Fill to proper level. If excessively low,
check all lines and joints for evidence of
external leakage.
Lack of lubrication in linkage.
Add lubricant where needed.
Tires not properly inflated.
Inflate to recommended pressure.
Insufficient oil pressure.
If all of the above checks do not reveal
the cause of hard steering, check oil
pressure:
Low oil pressure due to restriction
in hoses:
a. Check for kinks in hoses.
a. Remove kink.
b. Foreign object stuck in hose.
b. Remove hoses and remove restrict-
ing object or replace hose.
Low oil pressure due to steering
gear or cylinder:
a. Pressure loss in cylinder due to
a. Remove cylinder from truck for dis-
worn piston ring and rod seal.
assembly and inspection of ring and rod
seal.
b. Leakage at valve rings, valve
b. Remove gear from truck for disas-
body to worn seal.
sembly and replace seals.
c. Loose fit of spool in valve body
c. Replace valve.
or leaky valve body.
Valve squawks when turning
Cut or worn dampener ring on
Replace dampener ring, being careful
or when recovering from a
spool.
not to cut the new ring at installation.
turn
Loose or worn valve.
Replace valve.
No effort required to turn
Broken valve torsion bar.
Replace valve.
Figure 7-11. Table of Steering System Operational Tests (Sheet 2 of 2)
7-23
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