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POWER STEERING GEAR BOX AND LINKAGE
POWER STEERING37-28
LUBRICATION AND SEALING POINTS
AC200119AC
Grease: Silicone greaseFluid: 
     ATF DXRON III or 
     DEXRON II
Grease: Repair kit grease
Fluid: 
     ATF DXRON III or 
     DEXRON II
Sealant: 
     3M ATD Part No. 8661
     or equivalent
Grease: 
     Multipurpose grease 
     SAE J310, NLGI No.2 
     or equivalent
Fluid: 
     ATF DXRON III or 
     DEXRON II
Fluid: 
     ATF DXRON III or 
     DEXRON II
Fluid: 
     ATF DXRON III or 
     DEXRON II Grease: Repair kit grease
Fluid: 
     ATF DXRON III or DEXRON II 
         
        
        
     
        
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POWER STEERING GEAR BOX AND LINKAGE
POWER STEERING37-30
2. Turn the rack stopper anticlockwise to remove the circlip.
<> RACK  STOPPER/RACK 
BUSHING/OIL SEAL/O-RING/RACK 
ASSEMBLY REMOVAL
ACX01147 AB
1.
Pull out th e rack slo w ly . T a ke out th e rack stop per 
an d the  rack bushing  at the same time.
CAUTION
Do not damage the oil seal press fitting surface.
ACX01148AB
Rack bushing
2. Partially bend the oil seal and remove it from the 
rack bushing.
<> LOWER BEARING REMOVAL
ACX01149
MB990939
Lower bearing
AC
Valve housing
Use a brass bar or special tool brass bar 
(MB990939) to remove the lower bearing from the 
valve housing.
<> NEEDLE BEARING REMOVAL
CAUTION
Do not open special tool excessively to prevent 
damaging housing interior.
ACX01150 AB
Valve housing MB991120Needle 
bearing
Use special tool needle bearing puller (MB991120) to 
remove the needle bearing from the valve housing.
<> OIL SEAL REMOVAL
CAUTION
Be careful not to damage the inner surface of the 
rack cylinder of the gear housing.
AC100259
Oil seal
Pipe or similar tool
Gear housing
AB
Use a piece of pipe or simila
r tool to remove the oil 
seal from the gear housing.
REASSEMBLY SERVICE POINTS
>>A<< OIL SEAL INSTALLATION
1. Apply a coating of ATF DEXRON III or DEXRON II  to the both sides of the oil seal.
AC100260AI
Oil seal
MB991202 
MB991199 
Gear housing
MB991197
2. Using the following special tools, press the oil seal 
into the rack housing. 
         
        
        
     
        
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POWER STEERING GEAR BOX AND LINKAGE
POWER STEERING37-31
•Bar (long type) (MB991197)
•Oil seal installer (MB991199) 
•Oil seal and bearing installer (MB991202) 
>>B<< NEEDLE BEARING/LOWER 
BEARING INSTALLATION
1. Apply ATF DEXRON III or DEXRON II to housing and bearing press fitting surface.
CAUTION
Press-fit straight. The valve housing is alumin-
ium, and may become deformed if press-fit on an 
angle.
ACX01153
Needle bearing
MB990938
MB991202 MB991202
Lower 
bearing
AE
MB990938
2. Press fit needle bearing/lower bearing with the 
following special tools.
•Bar (snap-in type) (MB990938)
•Oil seal and bearing installer (MB991202)
>>C<< RACK ASSEMBLY INSTALLATION
CAUTION
Do not close the vent hole in the rack with 
grease.
ACX01154 AB
Seal ring and O-ring Vent hole
1. Apply a coating of repair kit grease to the rack 
teeth face.
ACX01155
MB991212 
MB991213 
AJ
Oil seal
2. Cover rack serrations with the following special  tool.
•Oil seal protector (MB991212) 
•Oil seal protector (MB991213) 
3. Apply ATF DEXRON III or DEXRON II to special 
tool, and to the outer surface of the seal ring and 
the O-ring.
4. Align the centre of the oil seal with the rack to prevent the retainer spring from slipping. Slowly 
insert the rack from power cylinder side.
>>D<< OIL SEAL/RACK BUSHING 
INSTALLATION
ACX01156 AE
Oil seal
O-ring
MB990927
Rack 
bushing
1. Apply ATF DEXRON III or DEXRON II to the outer  surface of the oil seal. Using special tool installer 
adapter (MB990927), press in the oil seal until it is 
flush with the bushing end face.
AC100261 AC
Rack
Plastic tape
Rack bushing
2. Apply ATF DEXRON III or DEXRON II to the oil  seal inner surface and the O-ring. 
         
        
        
     
        
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POWER STEERING GEAR BOX AND LINKAGE
POWER STEERING37-32
3. Wrap the rack end with plastic tape, and push the rack bushing onto the rack.
>>E<< CIRCLIP INSTALLATION
CAUTION
Insert the circlip to the rack stopper hole while 
turning the rack stopper clockwise.
ACX01158
Circlip
Slot
AB
Circlip
Slot
Insert the circlip to the rack stopper hole through cyl-
inder hole. Turn the rack stopper clockwise and 
insert the circlip firmly.
>>F<< UPPER OIL SEAL/UPPER 
BEARING INSTALLATION
ACX01159AC
MB990938
MB991203
Oil seal
MB991203 Bearing
MB990938
Apply a coating of ATF DEXRON III or DEXRON II to 
the outside of the upper oil seal/upper bearing. Using 
the following special tools, press the upper oil 
seal/upper bearing into the valve housing.
•Bar (snap-in type) (MB990938)
•Oil seal and bearing Installer (MB991203)
>>G<< SEAL RINGS INSTALLATION
ACX01160
AB
MB991317
Because the seal rings expand after installation, 
tighten after installing by using special tool seal ring 
installer (MB991317) to compress the rings, or press 
down by hand.
>>H<< LOWER OIL SEAL INSTALLATION
ACX01161
Housing
AC
Oil
seal
Approximately
1 mm
MB990941
CAUTION
To eliminate a seal malfunction at the valve hous-
ing alignment surface, the upper surface of the 
oil seal should project outward approximately 1 
mm from the housing edge surface.
Using special tool torque tube bearing installer 
(MB990941), press the oil seal into the valve hous
-
ing.
>>I<< END PLUG INSTALLATION
ACX01162
AB
End plug End plug
1. Apply specified sealant to the threaded part of the 
end plug. 
         
        
        
     
        
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POWER STEERING GEAR BOX AND LINKAGE
POWER STEERING37-33
Specified sealant: 3M ATD Part No.8661 or 
equivalent
2. Secure the threaded portion of the end plug at two places by using a punch.
>>J<< RACK SUPPORT COVER/LOCK 
NUT INSTALLATION
1. Position the rack at its centre.
2. Apply specified sealant to the threaded part of the 
rack support cover.
Specified sealant:
3M ATD Part No.8661 or equivalent
AC100273
MB990607 
MB991621 
AJ
3.Use the fo llo wing special to ol to  tigh ten the  rack 
suppor t cover to 2 3  
± 2 N⋅m.
•To rque wren ch socket (MB990607 ) 
•Piston driver (MB9916 21: 
4.T u rn  the rack suppo rt cover 30° anticlockwise .
5.Use the special tool  to hold the r a ck sup port 
cove r ,  and t hen tighten  the lock nut to  59 
± 10 
N
⋅m.
>>K<< T O T A L PINION T O RQUE 
ADJUSTMENT
CAUTION
•Be sure there is no ratcheting or catching 
when operating the rack towards the shaft.
•
AC100274 AB
MB991006
Measure the total pinion torque through the 
whole stroke of the rack.
1. Using special tool preload socket (MB991006), 
rotate the pinion shaft at the rate of one rotation in 
4 to 6 seconds to check the total pinion torque and 
the change in torque.
Standard value:
Total pinion torque: 0.8 − 2.1 N⋅m  
[Change in torque: 0.6 N
⋅m or less]
Total pinion torque: 0.7 − 2.1 N⋅m  
[Change in torque: 0.6 N
⋅m or less]
CAUTION
When adjusting, set at the highest value of the 
standard value range.
NOTE: If the total pinion toque cannot be adjusted 
to the standard value within the specified return 
angle, check the rack support cover components 
and replace any parts if necessary.
2. If the total pinion torque or the change in torque is  outside the standard value, move the rack support 
cover 0 
− 30°, and adjust the pinion torque again.
>>L<< TAB WASHER/TIE ROD 
INSTALLATION
ACX01163 AB
After installing the tie rod to the rack, fold tab washer 
end (two locations) to tie rod notch.
>>M<< BELLOWS BAND INSTALLATION
ACX01164 AB
W MB991561
Adjusting bolt Stopper
1. Turn the adjusting bolt of special tool boot band 
crimping tool (MB991561) to adjust the opening 
dimension (W) to the standard value.