ACURA TL 1995 Service Repair Manual

1. Pres s th e intermediat e shaf t inne r sea l int o th e
bearin g suppor t usin g th e specia l tool s an d a press .
Press
INTERMEDIAT E SHAF T
INNE R SEA L
Replace .DRIVER07749-001000 0
SEAL DRIVE RATTACHMEN T07947-SD9010 1
BEARING
SUPPOR T
2. Pres s th e intermediat e shaf t bearin g int o th e bear -
in g suppor t usin g th e specia l tool s an d a press .
Press
INTERMEDIAT E
SHAF T
BEARIN G
Replace .
BEARING
SUPPOR T DRIVE
R
07749-001000 0
SEAL DRIVE RATTACHMEN T07947-SD9010 1
SUPPORT COLLA R07965-SD9020 0
3. Sea t th e interna l circli p i n th e groov e o f th e bearin g
support .
CAUTION : Instal l th e circli p wit h th e radiuse d sid e
facin g out .
INTERNA L CIRCLI P
4. Pres s th e intermediat e shaf t int o th e shaf t bearin g
usin g th e specia l tool s an d a press .
Press
INTERMEDIAT E
SHAF T BEARIN G
ATTACHMENT, 3 5 m m I.D .
07746-003040 0
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Intermediate Shaf t
Reassembl y (cont'd )
5. Sea t th e externa l circli p i n th e groov e o f th e inter -
mediat e shaft .
CAUTION : Instal l th e circli p wit h th e radiuse d sid e
facin g out .
EXTERNA L CIRCLI P
INTERMEDIAT E
SHAF T
6. Pres s th e oute r sea l int o th e bearin g suppor t usin g
th e specia l tool s an d a press .
NOTE : Pres s th e sea l flus h wit h th e bearin g sup -
port.
OUTE R SEA L
Replace .
PressSTEE LPLAT E
ATTACHMENT ,45 x 55 m m I.D .07MAD-PR9010 0
Pack th e interio r an d
li p o f th e oute r seal .
7. Sea t th e 8 5 m m O-rin g in th e groov e o f th e bearin g
support .
85 m mO-RIN GReplace .
BEARING SUPPOR T
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Special Tool s
Ref. No.Too l Numbe r DescriptionQtyPag e Referenc e
Pilot Colla r
Hub Dis/Assembl y Bas e
Pisto n Sea l Rin g Sizin g Too l
Cylinde r En d Sea l Guid e
Pisto n Sea l Rin g Guid e
Pisto n Sea l Rin g Sizin g Too l
Bel t Tensio n Gaug e
Bal l Join t Remover , 2 8 m m
Cylinde r En d Sea l Remove r Attachmen t
Pisto n Sea l Rin g Sizin g Too l
P/ S Join t Adapte r (Pump )
P/ S Join t Adapte r (Hose )
Sleev e Sea l Rin g Guid e
P/ S Pressur e Gaug e
Bypas s Tub e Join t
Universa l Holde r
Attachment , 3 2 x 3 5 m m
Attachment , 3 7 x 4 0 m m
Drive r
Locknu t Wrench , 4 0 m m
Drive r Attachmen t
Front Hu b Dis/Assembl y Too l
Bal l Join t Boo t Cli p Guid e
Cylinde r En d Sea l Slide r
17-54
17-4 1
17-59
17-6 2
17-60
17-60
17-2 3
17-47
17-5 1
17-5 8
17-25
17-2 5
17-59
17-25
17-2 1
17-37 , 17-4 5
17-57 , 17-5 8
17-43
17-57
17-2 4
17-43
17-69
17-6 9
17-61
07GAF-PH7010 0
07GA F - SD4070 0
07GA G - SD4020 A o r
07GA G - SD4020 0
07GAG - SD4040 0 o r
07GA G - SD4040 A
07HAG-SF10200o r
07HAG-SF1010A
07HAG-SF1020 A
*07JGG-001010A
07MA C - SL0020 0
07NA D - SR3020 0 o r
07NA D - SR3020 A
07NAG - SR3090 0 o r
07 NA G - SR3090 A
07QAK-PV3011 0
07QAK-PV3012 0
07SAG-SW50100o r
07SAG-SW5010 A
07406-0010001
07406-001010 1
0772 5 - 003000 0
07746-001010 0
07746-001020 0
07749-0010000
07916-SA5000 1
0794 7 - 634050 0
0796 5 - SA5050 0
0797 4 - SA5080 0
0797 4 - 689080 1 o r
0797 4 - 689080 A
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Component Location s
Index
NOTE :
• I f a n intac t airba g assembl y ha s bee n remove d fro m a scrappe d vehicl e o r ha s bee n foun d defectiv e o r damage d dur -
in g transit , storag e o r service , i t shoul d b e deploye d (se e sectio n 24 ).
• Befor e removin g th e steerin g gearbox , remov e th e driver' s airba g assembl y an d steerin g wheel .
• Afte r installin g th e steerin g gearbox , chec k th e whee l alignmen t an d adjus t i f necessary .
SR S component s ar e locate d in thi s area . Revie w th e SR S componen t locations , precautions , an d procedure s in th e SR S
( sectio n 24 ) befor e performin g repair s o r service .
STEERIN G WHEE LRemoval , pag e 17-2 7
Disassembly/Reassembly , pag e 17-2 8
Installation , pag e 17-2 9
RESERVOI RFluid Replacement , 17-2 4
VALVE BOD Y UNI T
Overhaul , pag e 17-5 2
POWE R STEERIN G SPEE D SENSO R
Replacement , pag e 17-2 1
STEERING COLUM N
Removal , pag e 17-3 1
Inspection , pag e 17-3 3
Installation , pag e 17-3 4IGNITIO N SWITC HSee sectio n 2 3
POWE R STEERIN G PUM P
Pum p Bel t Inspection , pag e 17-2 3
Pum p Bel t Adjustment , pag e 17-2 3
Pum p Pressur e Check , pag e 17-2 5
Removal , pag e 17-3 7
Disassembly , pag e 17-3 7
Reassembly , pag e 17-4 2
Installation , pag e 17-4 6
STEERIN G GEARBO XRack Guid e Adjustment , pag e 17-2 4
Removal , pag e 17-4 7
Disassembly , pag e 17-4 9
Reassembly , pag e 17-5 6
Installation , pag e 17-6 6 TIE-RO
D EN D BAL L JOIN T
Bal l Join t Boo t Replacement , pag e 17-6 9
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System Descriptio n
This powe r steerin g syste m is speed-sensitive . It s mai n component s ar e a mechanica l spee d sensor , a rotar y valve-typ e
gearbox, an d a constan t volume , vane-typ e pump . Th e syste m regulate s th e powe r assis t accordin g to vehicl e speed , roa d
conditions , an d drivin g style . Th e amoun t o f powe r assis t change s linearl y fro m hig h assist , whe n drivin g a t lo w speed s o r
parking , t o lo w assist , whe n drivin g a t hig h speeds .
Fluid Flo w Diagra m
The flui d volum e fro m th e pump , whic h i s drive n b y th e cran k pulley , i s regulate d b y th e flo w contro l valv e buil t int o th e
pump . Th e regulate d flui d i s fe d t o th e valv e bod y uni t locate d outsid e th e pinio n shaf t o f th e steerin g gearbox . Th e flui d i s
regulate d t o th e prope r pressur e b y th e valve s i n th e valv e bod y uni t an d b y th e powe r steerin g spee d senso r befor e it
flow s t o th e powe r cylinder . Th e directio n o f th e flo w is determine d b y th e rotar y valve . Th e flui d the n returns to th e reser -
voi r throug h th e retur n passag e an d i s fe d t o th e pum p again .
To RESERVOI R
VALVE BOD Y UNI T
TORSIO N BA R
INPU T SHAF T
VALVE (SLEEVE )
RIGHT CYLINDE R PASSAG E
POWE R CYLINDE R
Steering Gearbo xLOW SPEE D FEE D PASSAG E
The steerin g gearbo x i s th e rack-and-pinio n type . Th e valv e bod y uni t consist s o f th e valv e bod y unit , wher e th e flui d pas -
sag e i s regulate d b y th e flui d pressure , an d th e assis t contro l valv e uni t whic h regulate s th e flui d passag e t o th e rotar y
valv e accordin g t o vehicl e speed .
ASSIST CONTRO L VALV E UNI T
STEERIN G RAC K VALV
E BOD Y UNI T
ToRESERVOI R
From PUM P
POWE R CYLINDE RCYLINDE
R LINE S ASSIS
T CONTRO L VALV E UNI T
PUM P
To POWE R STEERIN G
SPEE D SENSO R
PUM
P OUTLE T
HIGH-PRESSUR E
HIGH SPEE D
FEE D PASSAG E
POWER STEERIN G
SPEE D SENSO R
RESERVOI R
LEFT CYLINDE R
PASSAG E
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Steering Pum p
Constructio n
The pum p is a vane-typ e incorporatin g a flo w contro l valv e (wit h a n integrate d relie f valve ) an d i s drive n b y a POLY-V-bel t
fro m th e cran k pulley . Th e pum p feature s 1 0 vanes . Eac h van e perform s tw o intake/discharg e operation s fo r ever y rota -
tio n o f th e rotor . Thi s mean s tha t th e hydrauli c flui d pressur e puls e become s extremel y smal l durin g discharge .
DRIVE SHAF TFLOW CONTRO L VALV E
CAM RIN G
INLE T POR TVANE
ROTO R
Operatio n
The belt-drive n pulle y rotate s th e roto r throug h th e driv e shaft . A s th e roto r rotates , th e hydrauli c pressur e i s applie d t o
th e van e chambe r o f th e roto r an d th e vane s wil l rotat e whil e bein g pushe d ont o th e inne r circumferenc e o f th e ca m ring .
Th e inne r circumferenc e o f th e ca m rin g ha s a n extende d portio n wit h respec t t o th e cente r o f th e shaft , s o th e vane s
mov e downwar d i n th e axia l directio n a s th e roto r rotates . A s a resul t o f thi s rolle r movement , th e interna l volum e o f th e
van e chambe r wil l change , resultin g i n flui d intak e an d discharge .
START O F FLUI D INTAKE :FLUID INTAKE :FLUID MOVEMENT :FLUID DISCHARGE :
DISCHARGE POR T
The vane s ar e pushe d ont othe inne r circumferenc e o f th ecam ring .
The volum e o f th e van e cham -ber increase s s o tha t flui d i ssucke d in .
Th e sucked-i n flui d move stoward th e discharg e port .As th e vane s retur n t o th ethei r origina l positio n o n th einne r side , th e volum e o f th evan e chambe r decrease s s othe flui d i s discharge d fro mthe discharg e port .
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System Descriptio n
Steering Pum p (cont'd )
Flow Contro l
Fluid fro m th e pum p run s throug h a meterin g orific e to
th e valv e bod y unit . Thi s create s a pressur e differenc e
betwee n th e pum p an d valv e bod y uni t side s o f th e ori -
fice. Whe n pressur e in th e pum p sid e is highe r tha n th e
forc e o f th e sprin g holdin g th e flo w contro l valv e closed ,
i t pushe s th e valv e dow n (open) , an d exces s flui d
return s t o th e pum p inlet . Th e combine d effec t o f th e
meterin g orific e an d th e flo w contro l valv e provide s a
relativel y constan t flo w o f flui d t o th e valv e bod y unit .
PUM P
FLO W CONTRO L
VALVE
RELIEF VALV E OPE N
DAMPIN G
ORIFICE
FLOW CONTRO L
VALV E
RELIE F VALV E BAL L
METERIN GORIFICE
To Valv e bod y Uni t
Pressur e Relie f
As pressur e o n th e valv e bod y uni t sid e build s up , i t
pushe s th e relie f valv e bal l (insid e th e flo w contro l
valve ) u p agains t it s spring , an d exces s flui d return s t o
th e pum p inlet . As the pressur e unde r th e flo w contro l
valv e drops , th e relie f valv e bal l i s close d b y it s spring ,
an d th e flo w contro l valv e i s force d dow n again , allow -
in g exces s flui d fro m th e pum p sid e t o retur n t o th e
inlet . Thi s flo w contro l valve-relie f valv e cylinde r keep s
pump outpu t pressur e betwee n 7,00 0 - 8,00 0 kP a (7 0 - 8 0
kgf/cm2, 99 5 - 1,13 8 psi) .
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System Descriptio n
Power Steerin g Spee d Senso r
The powe r steerin g spee d senso r i s a trochoid-rotor ,
hydraulic pum p combine d wit h a relie f valv e an d a one -
wa y valve . I t i s drive n b y th e speedomete r gea r shaf t
which in tur n is drive n b y a helica l gea r o n th e differential .
ONE-WAY VALV E
INNER ROTO R
OUTER ROTO R
RELIE F VALV E
SPEEDOMETE R GEA R
The powe r steerin g spee d senso r turn s onl y whe n th e
ca r i s moving , controllin g th e assis t contro l valve .
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One-way Valve (In Power Steering Speed

Sensor)

When the vehicle is moving at high speed, negative

pressure develops at the sensor inlet because the power

steering speed sensor is pumping faster than the fluid

can be supplied. To compensate for this, the outlet and

inlet ports are connected internally by a passage con-

taining a one-way valve that lets output fluid recirculate

to the inlet port to equalize pressure.

Driving at High Speed:

ONE-WAY VALVE
RESERVOIR

ROTORS
Relief Valve (In Power Steering Speed Sensor)

When the vehicle is moving in reverse, the power steer-

ing speed sensor also turns backward and pumps fluid

in the opposite direction. To avoid building up pressure

in the reaction chambers that would increase steering

effort while driving in reverse, the inlet and outlet-ports

are connected by a second internal passage containing a

relief valve that allows the fluid to recirculate.

Driving in Reverse:

RESERVOIR

RELIEF VALVEProCarManuals.com

System Descriptio n
System Operatio n
Assist Contro l Valv e
The assis t contro l valv e uni t consist s o f th e assis t contro l valve , whic h i s controlle d b y th e powe r steerin g spee d sensor ,
an d th e pressur e contro l valve . Th e pressur e contro l valv e an d th e assis t contro l valve , locate d betwee n th e pum p an d th e
spee d sensor , contro l th e flui d passag e t o th e rotar y valve . Th e flui d pressur e fro m th e pum p i s reduce d t o a "standar d
pressure " b y th e pressur e contro l valve , an d thi s standar d pressur e i s fe d t o th e assis t contro l valve . Th e standar d pres -
sur e i s draw n ou t b y th e rotatio n o f th e spee d sensor , producin g a pressur e ga p betwee n th e pressur e contro l valv e an d
th e assis t contro l valv e whe n th e standar d pressur e flui d passe s th e senso r orifice . Thi s pressur e gap , whic h change s wit h
th e flui d volum e draw n (tha t is , i t change s wit h vehicl e speed) , i s referre d t o a s th e powe r steerin g spee d senso r signa l
pressure . Th e assis t contro l valv e operate s accordin g t o thi s spee d senso r signa l pressur e t o chang e th e flui d passag e t o
th e hig h spee d rotar y valve .
POWE R STEERIN G SPEE D SENSO R
STANDAR D PRESSUR E
PRESSUR E CONTRO L VALV E
SPRING
To RESERVOI R
T o HIG H SPEE D VALV E
ASSIST CONTRO L VALV E POWE
R STEERIN G SPEE D
SENSO R SIGNA L PRESSUR E
ORIFICE
ORIFICE
FEED
SPRIN G
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