Page 693 of 1681
Power Steering Gearbox
Disassembly
Steering Rack Disa3sembly
NOTE:
. Before disassembling the gearbox, wash it off with
solvent and a brush.
. Do not dip seals and O-rings in solvent.
L Remove the steering gearbox (see page 17-41).
2. Remove the air hose and clips.
3. Remove the tie-rod end and locknut,
Remove the boot bands and tube clamps. Pull the
boots away from the ends of the gearbox.
TUBE CLAMP
CLIP
BOOT
17-44
SPRING
5. Hold the left end of the steering rack with a wrench
and unscrew the rack end with a wrench.
TIE-ROD LOCK WASHERBePlace
Loosen the locknut and remove the rack guide
screw.
Remove the spring and rack guide from the gearbox
housing.
7.
RACK GUIDEscnEw
,s*LOCKNUT
RACK GUIDE
Page 694 of 1681
8.Remove the cylinder line A and B from the gearbox.
Drain the fluid from the cylinder fittings by moving
the steering rack back and forth.
Remove the two flange bolts, then remove the valve
body unit from the gearbox, (See page 17-47 for
valve body unit disassembly.)
FLANGE BOLT
10.
CYLINDER LINE B
VAI.VE BODY UNIT
11.Orill a 3 mm (0.12 in) diameter hole approximately
2.5 - 3.5 mm (0.10 - 0.14 in) in depth in the staked-point on the cylinder.
NOTE: Oo not allow metal shavings to enter the
cylinder housing.
12. Install a puller yoke to the steering gearbox. Clamp
the puller yoke in a vise with soft jaws as shown,
then loosen and remove the cvlinder end,
CYLINDER END
STAKED POINT
\\
i D.pth:2.5 - 3.0 mm {0.10 - 0.'12 inl
re
17-45l
Page 695 of 1681

Power Steering Gearbox
Disassembly (cont'dl
VINYL TAPE
12 mmFLANGE NUT
13. Set the gearbox in a press so the gearbox housing
pornts upward.
14. Install the flange bolt into the end of the steering
rack until it bottoms in the hole, then back the
flange bolt out 1/4 turn. Hold the flange bolt and
tighten the flange nut against the rack by hand.
15. Press the cylinder end seal and steering rack out of
the gearbox.
NOTE: Hold the steering rack to keep it from falling
when pressed clear.
T-
I
I170 mm
CYLINDEREND SEAL
Remove the flange bolt and cylinder end seal from
the steering rack.
Press
t
18.
17.
Ple3s
I
ATTACHMENT, 23 x 25 mm
07NAD - SR3020A
CYLINDER ENDSEAL
19. Carefully pry the piston seal ring and O-ring off the
oiston of the rack.
CAUTION: Be carelul not to damage the inside of
seal ring groove when remoying the seal ring.
lnsert a 24" long, 3/8" drive extensjon, and the spe-
cial tool into the cylinder from the gearbox side.
CAUTION: Be careful not to damage the inside sur-
lace of the housing with the lools.
Set the gearbox in a press, then press out the cylin-
der end seal and backup ring from the gearbox.
CAUTION:
. Keep the tool straight to avoid damaging the
cylinder wall, Chcck thc tool angle, and correct il
necessary, when removing the cylinder end s€al.
. Use a press to remove the cylinder end seal. Do
not try to remove the seal by striking the tool. lt
will brcak the backup ring and the cylinder end
seal will remain in the gesrbox.
Replace
17-46
Page 697 of 1681

Power Steering Gearbox
Disassembly (cont'd)
25. Using a cutter or an equivalent tool, cut and remove
the four seal rings from the sleeve.
CAUTION: 86 caroful not to damage the edgos of
the 3leeve grooves whon removing the scal rings
and O-ring.
Using I cutter or an equivalent tool, cut the valve
seal ring and O-ring at the groove the pinion shaft.
Remove the valve seal ring and O-ring.
CAUTION: 86 careful not to d.mago the sdges ol
lhe pinion shaft groove whgn removing the valvo
seal ring and O-ring.
SLEEVE
Cutting slot position.
17 -48
t"fRemove the valve oil seal and wave washer ring
from the pinion shaft.
NOTE:
. Inspect the ball besring by rotating the outer
race slowly. lf there is excessive play, replace the
pinion shaft and sleeve as an assembly.
. The pinion shaft and sleeve are a precise fit; do
not intermix old and new pinion shafts and
steeves.
VALVE OII- SEALReplace.
Press the valve oil seal and bushing out of the valve
housing using a hydraulic press and special tool
shown below.
ATTACHMENT, 23 x 25 mm
07NAD - SB3020A
VALVE OIL SEALReplace.
28.
BALL EEARING
BUSHING
Page 699 of 1681

Power Steering Gearbox
Reassembly (cont'dl
i
valv6 Body Reasrombly
1. Apply vinyl tape to the stepped portion of the pin-
ion shaft, and coat the surface of the vinyl tspe with
the power steering fluid.
Vinyl tlp€lst.ppcd ponionl
Groov€ side.
Install the wave washer,
Coat the inside surface of the new valve oil seal
with power steering fluid.
Slide the valve oil sesl over the pinion shaft, being
careful not to damage the sealing lip.
CAUTIONT ln3tall the v8lve oil 3eal whh itr groovod
side facing oppositc thc braring.
Fit the new O-ring in the groovo of the pinion shaft.
Then slide the new valve sesl ring over the shaft
and groove in on the pinion shaft.
Remove the vinyl tape from the pinion shaft.
NOTE: Do not over - expand the valve seal ring.
Sr.lino
E
lip
VALVE SEAL RINGReplace.Do not over-expand.
17-50
7. Apply power steering fluid to the surJace of the
valve seal ring that was installed on the pinion
shaft,
Apply power steering fluid to the inside of the spe-
cial tool, Set the larger diameter end of the special
tool over the valve seal ring.
Move the sDecial tool uo and down several times to
make the valve seal ring fit in the pinion shaft.
11.
(w(ffi \
Use the wider diameter Make th6 valve seal ringend of the special snugly fit in the pinion
tool first to make shaft using the other endthe valve seal ring (smaller diameter end) ofIit in the pinion the special tool.shalt.
Remove the special tool,
Turn the special tool over and set the smaller diam-
eter end of the special tool over the valve seal ring,
Move the special tool up and down several times to
make the vslve seal ring snugly fit in the pinion
shaft.
Page 701 of 1681
Power Steering Gearbox
Reassembly (cont'dl
20. Press the bushing into the valve housing using a
hydraulic press and speciai tool as shown.
DRIVER07749 - U)l 0000
ATTACHMENT,32x35mmPress
I07746 - fi)l01(x)
sUSHING
21.Apply vinyl tape to the pinion shaft, then coat the
vinyl tape with power steering fluid.
I
i
I
VALVE OIL SEALReplace.
VALVE HOUSING
Vinyltape
PINION
E
SITEVE SEAL RINGSReplace.8e sure that theseal rings are notturned up, theninstall.
Insert the pinion shaft into the valve housing.
CAUTION: Be careful not to damage the valve seal
rings.
Remove the vinyl tape from the pinion shaft.
Seding lip lrce.
17-52
24. Press the pi.ion shafvsleeve into the valve housing
using a hydraulic press as shown.
NOTE: Check that the pinion shaft/sleeve turns
smoothly by turning the pinion shaft with your
hand.
Page 703 of 1681

Power Steering Gearbox
Reassembly {cont'd}
34. Separate the cylinder end seal from the special tool,
then remove the tool from the steerino rack.
CYLINDER END SEALReplace.
lnstall the backup ring on the steering rack. then
place the cylinder end seal to piston.
Grease the steering rack teeth, then insert the steer-
ing rack into the gearbox housing.
CAUTION: Be carelul not to damage to inner sur-
tace of the gearbox housing with the rack edges.
BACKUP BING
CYLINDER END SEAL
17-54
37.
38.
Set the gearbox in a press with the cylinder housing
facing upward.
Install the flange bolt into the end of the steering
rack until it bottoms in the hole. then back the
tlange bolt out 1/4 turn. Hold the flange bolt and
tighten the flange nut against the rack by hand.
Install the cylinder end seal into the bottom of the
cylinder by pressing on the bolt with a press as
shown.
CAUTION: Do not push on th€ boh with excossive
lorce; as it may damage thecylinder end seal.
Press
I
12 x 170 mm FLANGE BOLT
12 mm FLANGE NUT
Wrap vinyl tape around the rack end edges, and
coat the surface of the tape with the power steering
flu id.
NOTE: Make sure that the vinyl tape is wrapped care-
fully so that there is no stepped ponion.
Coat the inside surface of the new cvlinder end seal
with power steering fluid.
Install the cylinder end seal onto the steering rack
with its grooved side toward the piston.
CAUTION: When installing the cylinder end seal,
be careful not to damage the sealing lip face of the
seal with the edges of the steering rack,
Stak6d oosition.
39.
41.
Make sure the springis in the cylinder end
Page 704 of 1681

Remove the vinyl tape from the steering rack, then
push in the cylinder end seal with your finger.
NOTE:
. Remove any resideue of tape adhesive.
. Take care not to damage the cylinder end seal
with the threads and burrs at the staked position
of the gearbox.
Install a puller yoke to the steering gearbox, then
clamp the puller yoke in a vise wjth soft jaws as
shown.
PULLER YOKEI{Commcrci.lly .vailablelSn.p-On@ T/N c.r123-1oTc€ T/N 7372or equivalent
Grease the inside surface of the cylinder end. then
install the cylinder end by screwing it into the cylin
der,
After tightening the cylinder end, stake the point of
the cylinder housing shown below.
NOTE: Stake in the cylinder in the position opposite
from where the stake was removed during disas-
semory.
Stake point. Dopth: 1.0 mm (0.04 inl
4.0 mm (0.16 inl
CYLINOER END
46.
\
47.
49.
coat the new o-ring with grease and install it in the
groove in the gearbox housing.
Apply grease to the needle bearing in the gearbox
ho using.
Install the valve body unit on the gearbox housing
by engaging the gears. Tighten the flange bolts to
the specified torque.
NOTE: Note the valve body unit installation posi-
tion (direction of pipe connection).
VALVE BODY UNIT
(cont'd)
O.RINGReplace.
-611
NEEDLE AEARING
-Grl
17-55