1998 HONDA CR-V pinion

Differential
Differential Carrier Replacement
NOTE: The illustration shows the 4WD automatic trans-mission differential; the 2WD differential is similar.
1. Remove the snap ring from the differential carrier.
Remove the 5 x 15 mm roller (4WD) or 5 x 10 mmroller (2WDl and the speedometer drive gear.
SPEEDOMETER DRIVE GEAR RoI I FP
Remove the bolts securing the final driven gear andthe transfer shaft drive gear (4WD), then replace thedifferential carrier.
5 x 15 mm (/tWD)5 x 10 mm {2WDl
14-224
SPRING PINGROOVE
Install the final driven gear on a new differential car-rier with its chamfered side facing the carrier andthe transfer drive gear (4WD),
Tighten the bolts to the specified torque.
NOTE: The 2WD differentiat bolt has left-handthreads,
10 x 1.0 mm103 N.m 110.5 kd.m,7s.9 rbr.ft)
7.
FINAL DRIVEN GEAR
TRANSFER SHAFT
Install the speedometer drive gear with its cham-fered side facing the carrier. Align the cutout on thebore of the speedometer drive gear with the 5 x 15mm roller (4WD) or 5 x 10 mm roller (2WD).
Align the hooked end of the snap ring with thespring pin in the pinion shaft. then install the snaoring in the differential carrier groove
SNAP RINGInstall in this direction.Hooked end
PINION SHAFT
{4WDl
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Description
Rear Differential
Outline
The Real-time 4WD-Dual Pump System model has a hydraulic clutch and a differential mechanism in the rear differential
assembly. Under normal conditions, the vehicle is driven by the front wheels. However, depending on to the driving force
of the front wheels and the road conditions. the system instantly transmits appropriate driving force to the rear wheels
without requiring the driver to switch between 2WD (tront wheel drive) and 4WD (four wheel drive). The switching mecha-
nism between 2WD and 4WD is integrated into the rear differential assembly to make the system light and compact.
ln addition, the dual-pump system switches off the rear-wheel-drive force when braking in a forward gear. This allows the
braking system to work properly on models equipped with an Anti-lock Braking System (ABS).
Construction
The rear differential assembly consists of the torque control differential case assembly and the rear differential carrier
assembly. The torque control differential case assembly consists of the differential clutch assembly, the companion
flange, and the oil pump body assembly. The rear differential carrier assembly consists of the differential mechanism. The
differential drive and driven gears are hypoid gears.
The oil pump body assembly consists of the front oil pump, the rear oil pump, the hydraulic control mechanism, and the
clutch piston. The clutch piston has a disc spring that constantly provides the differential clutch assembly with a preset
torque to Drevent abnormal sound.
The clutch guide in the differential clutch assembly is connected to the propeller shaft via the companion flange, and it
receives the driving force lrom the transfer assembly. The clutch guide rotates the clutch plate and the front oil pump in
the oil pump body.
The clutch hub in the differential clutch assembly has a clutch disc that is splined with the hypoid drive pinion gear. The
hypoid drive gear drives the rear oil pump.
The front and rear oil pumps are trochoidal pumps. The rear oil pump capacity is 2.5 percent larger that the front oil pump
to handle the rotation difference between the front and rear wheels caused by worn front tires and tight corner braking.
The oil pumps are designed so the fluid intake works as a fluid discharge when the oil pumps rotate in reverse. Genuine
Honda CVT fluid is used instead of differential fluid.
Operation
When there is a difference in rotation speed between the front wheels (clutch guide) and rear wheels (hypoid driven gear),
hydraulic pressure from the front and rear oil pumps engages the differential clutch, and drive force from the transler
assembly is applied to the rear wheels.
The hydraulic pressure control mechanism in the oil pump body selects 4WD mode when the vehicle is started abruptly,
or when accelerating in a forward or reverse gear (causing rotation difference between the front and rear wheels). or
when braking in reverse gear {when decelerating). lt switches to 2WD mode when the vehicle is driven at a constant speed
in forwar! or reverse gear (when there is no rotation difference between the front and rear wheels), or when braking in a
fo rwa rd gear (when decelerating).
To protect the system, the differential clutch assembly is lubricated by hydraulic pressure generated by the oil pumps in
both 4WD and 2WD modes. Also, the thermal switch relieves the hydraulic pressure on the clutch piston and cancels 4WD
mode if the temDerature of the differential fluid rises above normal.
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TOROUE CONTROL OIFFERENTIAL
REAR DIFFERENTIAL ASSEMBLY
OIL PUMP BODY
OIFFERENTIAL CLUTCHHYPOID DRIVEPINION GEAR
OIFFERENTIAL CARRIER
DIFFERENTIAL
HYPOID RING GEAR
DIFFERENTIAI- HOUSING
REAR OII- PUMP
ASSEMBLY
CLUTCH GUIDE
COMPANION FLANG€
CLUTCH HUB
CLUTCH PLATE
HYDRAULIC CONTROL SYSTEM
CLUTCH PISTON
CLUTCH DISC
REAR OIL PUMP
FRONT OIL PUMP
DISC SPRINGFRONT OIL PUMP
DIFFEREMT|AL CLUTCHASSEMBI-Y
THERMAL SWITCHRELIEF VALVEOIL STRAINER
15-5
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Troubleshooting
Fluid Leaks
Check the gearbox assembly for oil leaks carefully. Oil can leak out ot various points, depending on location of the faulty
oil seals/seal rings. Check the following before removing the gearbox from the frame.
Steering GearboxLeaking from the oil seal on thetop of the valve housing.Replace the valve oil seal fromthe valve housing.
Leaking from cylinder end intoleft tie rod boot.Replace the valve oil seal fromthe pinion shaft.
Replace the cylinder end seal onthe valve body unit side.
Leaking from cylinder end intoright tie-rod boot.Replace the cylinder end seal onthe cylinder end side.
Leaking lrom the shaft upper endsection or pin engagement sec-tion of the pinion shaft.Replace the valve body unit.
Tighten the connector. It it's stillleaking, replace the line, cylinderor valve housing.
Leaking from cylinder line A or Bconnections (at tlare nut).
Leaking caused by a damagedcylinder line A or B.Replace cylinder line A or B.
Leaking from pump outlet hoseand return line joint fitting on thevalve body unit {at tlare nut}.
Tighten the connector. ll it's stillleaking, replace the line, joint fit-ting or valve housing,
17-10
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Steering Linkage and Gearbox
PINION SHAFT GROMMETInspoct for damage and deterioration.
STEERING JOINTSCheck for loose joint bolts.
NE-ROD LOCKNUTCheck Ior loose locknut.
Inspect for loose mounting bolts.GEARBOX MOUNTING CUSHIONSlnsp6ct for dgterioration.BOOTlnspect for damag€ and d€terioration.
BALL JONT AOOTInspoct lor damage and deterioration.S€e page 17-50 for replacemont.
END AAtL JOINTInspect for faulty movementano oamag€.
17-13
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8. Installation is the reverse ofthe removal procedure.
Note these items during installation:
. Be sure the wires are not caught or pinched by
any parts when installing the column.
a Make sure the wire harness is routed and fas-
tened properly.
. Make sure the connectors are properly connected.
. Make sure the steering joint is connected as fol-
lows:
a. lnsert the uDper end of the steering joint onto
the steering shaft (line up the bolt hole with
the flat ot the shaft).
b. Slip the lower end of the steering ioint onto
the Dinion shaft (lins up the bolt hole with the
groove around the shaft). and installthe lower
ioint bolt. Be sure that the lower joint bolt is
securely in the groove in the pinion shaft'
c. Pull on the steering joint to make sure that the
steering joint is JullY seated.
Then install the upper joint bolt and tighten it.
22 N.m (2.2 kgf.m, 16lbt.ftl
UPPER JOINT BOLT
Bolt must Iine uPwith fl6t on shaft.
Flat ponion.
SIEERING JOIMT
STECRING JOINT
LOWER JOINT BOLTBolt must line up withgroove around on shaft,
Inspection
Check the steering column ball bearing and the steer-
ing joint bearings for play and proper movement. lf
there is noisy or if there is excessive play, replace the
steering column as an assemblY
Check the retaining collar for damage. lf it is dam-
aged, replace the retaining collar.
PLASl'tCINJECTIONS
ABSOBBINGPLATE
SHIFT I.EVER
. Check the absorbing plates, absorbing plate guides
and sliding capsules Jor distortion and breakage.
ReDlace the column as an assembly if they are dis-
torted or broken.
SLIDING CAPSUIIThis part is attachedto the column bracketwith the plastic injections.
FETAINING COLLAR
ABSORBINGPLATE GUIDE
|GNMON SWTTCHSee section 23.(cont'd)
17-21
See section 14.
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5. Hold the steering rack with a wrench {'98 - 00 mod-
els: left end onlv), and unscrew the rack end with
another wrench, Be careful not to damage the rack
surface with the wrench,
LOCK WASHER
Loosen the locknut, then remove the rack guide
screw and O-ring ('97 model).
6.
1.
LOCKNUT
Remove the spring and the rack guide from the gear-
DOX.
RACK GUIDE
9.
8. Remove cylinder lines A and B from the gearbox,
CYLINDER LINE A
Drain the fluid from the cylinder fittings by slowly
moving the steering rack back and {orth.
Remove the two tlange bolts, then remove the valve
body unit from the gearbox. (See page 17-38 for
valve body unit disassembly.)
VINYL TAPE
FLANGE BOLT
Apply vinyl tape to stepped portion of the pinion
shaft, and remove the dust cover.(cont'd)
DUST COVER
11.
17-35
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Power Steering Gearbox
Disassembly (cont'd)
Valve Body Unit Dbassembly
23. Before removing the valve housing, apply vinyltape
to solines of the Dinion shaft.
VALVE HOUSING
Separate the valve housing from the pinion shafv
valve using a press.
Check the inner wall of the valve housing where the
seal ring slides with your finger. lf there is a step in
the wall, the valve housing is worn. Replace the
valve housing.
Note these items during inspection:
o There may be the sliding marks from the seal
ring on the wall of the valve housing. Replace
the valve housing only if the wall is stepped.
. When the valve housing is replaced, install new
shim{s) on the bearing surface of the housing to
adiust the thickness.
Check the inside ofvalve housingfor a step in the wall.
17-38
26. Check for wear, burrs and other damage to the
edges of the grooves in the sleeve.
NOTE: The pinion shaft and sleeve are a precision
matched set. lf either the oinion shaft or sleeve
must be replaced, replace both parts as a set.
SLEEVE SEAL RINGSCheck for Deel off or
27. Remove the circlip and sleeve from the pinion shaft.
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