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>> Download 37A documenatation <<Text preview - extract from the document 37A-1
GROUP 37A
POWER STEERING
CONTENTS
GENERAL DESCRIPTION. . . . . . . . . 37A-2 STEERING WHEEL AND SHAFT
ASSEMBLY. . . . . . . . . . . . . . . . . . . . . 37A-20
POWER STEERING DIAGNOSIS . . . 37A-2 REMOVAL AND INSTALLATION . . . . . . . . 37A-20
INTRODUCTION TO POWER STEERING DISASSEMBLY AND ASSEMBLY . . . . . . . 37A-21
DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . 37A-2
POWER STEERING DIAGNOSIS POWER STEERING GEAR BOX
TROUBLESHOOTING STRATEGY . . . . . . 37A-3 ASSEMBLY. . . . . . . . . . . . . . . . . . . . . 37A-23
SYMPTOM CHART. . . . . . . . . . . . . . . . . . . 37A-3 REMOVAL AND INSTALLATION . . . . . . . . 37A-23
SYMPTOM PROCEDURES . . . . . . . . . . . . 37A-3 INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 37A-25
DISASSEMBLY AND ASSEMBLY . . . . . . . 37A-26
SPECIAL TOOLS. . . . . . . . . . . . . . . . 37A-11 INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 37A-36
TIE ROD END BALL JOINT DUST COVER
ON-VEHICLE SERVICE. . . . . . . . . . . 37A-13 REPLACEMENT . . . . . . . . . . . . . . . . . . . . . 37A-36
STEERING WHEEL FREE PLAY CHECK . 37A-13
STEERING ANGLE CHECK . . . . . . . . . . . . 37A-14 POWER STEERING OIL PUMP
TIE ROD END BALL JOINT BREAKAWAY ASSEMBLY. . . . . . . . . . . . . . . . . . . . . 37A-37
TORQUE CHECK . . . . . . . . . . . . . . . . . . . . 37A-14 REMOVAL AND INSTALLATION . . . . . . . . 37A-37
STATIONARY STEERING EFFORT INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 37A-37
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37A-15
DISASSEMBLY AND ASSEMBLY . . . . . . . 37A-38
STEERING WHEEL RETURN TO CENTER
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . 37A-39
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37A-16
DRIVE BELT TENSION CHECK. . . . . . . . . 37A-16
POWER STEERING HOSES . . . . . . . 37A-40
FLUID LEVEL CHECK . . . . . . . . . . . . . . . . 37A-16
REMOVAL AND INSTALLATION . . . . . . . . 37A-40
FLUID REPLACEMENT . . . . . . . . . . . . . . . 37A-16
POWER STEERING SYSTEM BLEEDING 37A-17
SPECIFICATIONS . . . . . . . . . . . . . . . 37A-45
OIL PUMP PRESSURE TEST . . . . . . . . . . 37A-18
FASTENER TIGHTENING
POWER STEERING PRESSURE SWITCH SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . 37A-45
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37A-19
GENERAL SPECIFICATIONS . . . . . . . . . . 37A-46
BALL JOINT DUST COVER CHECK . . . . . 37A-19
SERVICE SPECIFICATIONS . . . . . . . . . . . 37A-46
LUBRICANTS . . . . . . . . . . . . . . . . . . . . . . . 37A-47
SEALANTS . . . . . . . . . . . . . . . . . . . . . . . . . 37A-47
37A-2 POWER STEERING
GENERAL DESCRIPTION
.
G EN ER AL DESC RIPTIO N
M1372000100070
The vehicle uses engine speed-responsive hydraulic The steering column in all vehicles has a shock
power steering. absorber mechanism and a tilt steering mechanism.
The steering wheel has three spokes. In addition, all A vane-type oil pump with a fluid flow control system
vehicles are equipped with SRS (Supplemental has been included. The steering gear and linkage is
Restraint System). rack and pinion type.
STEERING
WHEEL
TILT LEVER
STEERING GEAR
STEERING COLUMN
AND LINKAGE
ASSEMBLY
OIL RESERVOIR
OIL PUMP
AC003276 AB
PO W ER STEERING DIAG NO SIS
INTRODUCTION TO POWER STEERING DIAGNOSIS
M1372008500061
Hydraulic power steering is used for all vehicles.
Faults in the power steering can include excessive
play of the steering wheel, difficult steering wheel
operation, noise, vibration, and oil leaks, etc.
Possible causes of these faults can include defects
in the gear box, oil pump or steering linkage.
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POWER STEERING 37A-3
POWER STEERING DIAGNOSIS
POWER STEERING DIAGNOSIS TROUBLESHOOTING STRATEGY
M1372007300064
Use these steps to plan your diagnostic strategy. If 2. Verify that the condition described by the
you follow them carefully, you will be sure that you customer exists.
have exhausted most of the possible ways to find a 3. Find the malfunction by following the Symptom
power steering fault. Chart.
1. Gather information from the customer. 4. Verify malfunction is eliminated.
SYMPTOM CHART
M1372007600065
SYMPTOMS INSPECTION REFERENCE PAGE
PROCEDURE
Excessive play of steering wheel 1 P.37A-3
Difficult steering wheel operation (insufficient power assist) 2 P.37A-4
Rattling noise 3 P.37A-6
Shrill noise 4 P.37A-6
Squealing noise 5 P.37A-7
Hissing noise 6 P.37A-7
Droning noise 7 P.37A-7
Squeaking noise 8 P.37A-8
Vibration 9 P.37A-9
Oil leakage from hose connection 10 P.37A-9
Oil leakage from hose assembly 11 P.37A-9
Oil leakage from oil reservoir 12 P.37A-10
Oil leakage from oil pump 13 P.37A-10
Oil leakage from gear box 14 P.37A-10
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Excessive Play of Steering Wheel
DIAGNOSIS
STEP 1. Check for looseness at the steering shaft coupling
section and at the steering wheel linkage.
Q: Is there any looseness?
YES : Repair or replace the part. Then go to Step 3.
NO : Go to Step 2.
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37A-4 POWER STEERING
POWER STEERING DIAGNOSIS
STEP 2. Check the steering wheel free play.
(1) With engine running (hydraulic operation), set front wheels
straight ahead.
(2) Measure the play on steering wheel circumference before
wheels start to move when slightly moving the steering
wheel in both directions.
Limit: 30 mm (1.2 inch)
(3) If the free play exceeds the limit value, set steering wheel
straight ahead with engine stopped. Load approximately 5
N (1.1 pound) toward steering circumference and check
AC000987
play.
Standard value (steering wheel play with engine
stopped): 10 mm (0.4 inch) or less
Q: Does the play exceed the standard value?
YES : Remove steering gear box (Refer to P.37A-23.) and
check total pinion torque (Refer to P.37A-25.). Then
go to Step 3.
NO : Go to Step 3.
STEP 3. Check steering wheel play.
Verify that the steering wheel play is not excessive.
Q: Is the steering wheel play excessive?
YES : Repeat to Step 1.
NO : Diagnosis is complete.
INSPECTION PROCEDURE 2: Difficult Steering Wheel Operation (Insufficient Power Assist)
DIAGNOSIS
STEP 1. Check the power steering belt tension.
Refer to GROUP 00, Maintenance Service - Drive Belts P.00-
40.
Q: Is the power steering belt tension within the standard
value?
YES : Go to Step 2.
NO : Adjust the tension. (Refer to GROUP 00,
Maintenance Service - Drive Belts P.00-40.) Then go
to Step 10.
STEP 2. Check the belt for damage.
Q: Is the belt damaged?
YES : Replace the belt. Then go to Step 10.
NO : Go to Step 3.
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POWER STEERING 37A-5
POWER STEERING DIAGNOSIS
STEP 3. Check the fluid level.
(1) Park the vehicle on a flat, level surface, start the engine,
and then turn the steering wheel several times to raise the
temperature of the fluid to approximately 50 - 60
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