SERVICE MANUAL
CONDITION
POSSIBLE CAUSE
CORRECTION
Low pressure to steering gear
6
Low oil level
6
Fill reservoir to proper level
(Contd.)
and check for leaks.
7
Loose belt
7
Adjust belt tension to specifica-
tion
Hard steering or lack of assist
1
Loose belt
1
Adjust belt tension to specifica-
especially in parking
tion
2
Low oil level
2
Fill reservoir to proper level
and check for leaks.
3
Steering gear to column
3
Align steering column
misalignment
4
Lower coupling flange rub-
4
Loosen pinch bolt and assemble
bing against steering gear
properly
5
Tires not properly inflated
5
Inflate to recommended pressure
6
Cracked or broken pres-
6
Replace parts.
sure plate or cam ring
7
Missing housing ball plug
7
Replace part.
or cracked housing
Note: If checks 1 through 7
Further possible causes
In order to diagnose conditions
do not reveal cause of hard
could be:
such as listed in 8, 9, 10 and
steering, refer to Power Steer-
8
Sticky flow control valve
11, a test of the entire power
ing System Test Procedure
steering system is required.
9
Insufficient pump pressure
output
10 Excessive internal pump
leakage
11 Excessive internal system
leakage
POWER STEERING SYSTEM TEST PROCEDURE
This -section presents a systematic method of
diagnosing and trouble shooting the power steering
hydraulic system. Start with Step 1 and move
consecutively through the remaining steps completing
every procedure and if necessary, the correction
described before moving on.
1.
Disconnect pressure hose at pump or gear and
connect power steering analyzer SE-2780 (Fig.
2) in series with the pressure hose.
2.
Open valve on analyzer and start engine. Allow
power steering system oil to reach normal
operating
temperature
and
check
analyzer
connections for leaks. Correct if necessary.
3.
Check fluid level in system and add fluid as
required.
4.
With engine at idle, record flow and pressure. If
pressure is in excess of 517 kilopascals
(75 PSI), check hoses for restrictions and correct
as required.
5.
With engine at idle, partially close valve on
analyzer to build 4826 kilopascals (700 PSI) and
record flow. Subtract this flow from the flow
recorded in Step 4. Flow should not drop more
than 3.8 1/MIN (1 GPM). If flow drops more than
3.8 1/MIN (1 GPM), check rotating group (cam
ring, rolls and carrier) in pump and correct as
required.
6.
Close and partially open analyzer valve three
times. Record the highest pressure each time
the valve is closed.
IMPORTANT
Do not leave valve fully closed for more than
five
seconds
as
the
pump
could
be
damaged.
CTS - 4027 - Page 6