1998 HONDA CR-V Transfer

49. Set the control shaft to E position, and install the
A,/T gear position switch on it.
CONTROL SHAFT
l( ((,,, ,.
*
$*\.t+-
NN
6x1.0mm12 N.m 11.2 kgt.m,8.7 tbf.ftl
6xl.0mm12 N.m 11.2 kgf'm,
8,7
'gtt - 00 MoDELS{6 position3}T
Install the A/T gear position switch cover, then
install the harness clamps of the AviT gear position
switch harness on the end cover and the transmis-
sion housing.
50.
CONTROL SHAFT
HARNESS CLAMP
HARNESS CLAMP
Clean the areas where the transfer assembly con-
tacts the transmission with solvent or carburetor
cleaner, dry with compressed air, then coat the con-
tact areas with ATF. (4WD)
Install the transfer assembly with a new O-ring. Do
not allow dust or other foreign particles to enter the
transmission. {4WD)
O.RINGReplace-
10 r 1.25 mma,a N'm 14.5 kgt'm, 33 lbf'ftl
54.
55.
lnstall the cooler lines with the line bolts and new
sealing washers.
TOROUE: 28 N.m 12.9 kgif'm. 21 lbf'ft)
Install the ATF dipstick.
lnstall the breather cap on the breather pipe so its
arrow points to the transmission hanger.
TRANSMISSION
14-257
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17. Install the right and left driveshafts (see section 18).
While installing the right driveshaft in the differen-
tial, be sure not to allow dust or other foreign parti-
cles to enter the transmission.
NOTE:
. Clean the areas where the right driveshaft con-
tacts the transmission (differential) with solvent
or carburetor cleaner, and dry with compressed
air.
. Turn the right and left steering knuckle fully out-
ward, and slide the right driveshaft into the dif-
ferential until you feel its spring clip engage the
side gear. Slide the left driveshaft into the inter-
mediate shaft until you feel the spring clip of the
intermediate shaft engage the left driveshaft,
18. Install right damper fork, then install the right and
left ball joints on each lower arm with the castle
nuts and new cotter pins (see section 18).
DAMPER PINCH BOLT10 x 1 .25 mm43 N.m 14.{ kgf.m,32 rbr.ftl
DAMPERFORX
SELF.LOCKING NUT12 x 1,25 mm6/t N m (6.5 kg{.m, a7 lbtft)Replace.
Replace.
CASTLE12 x 1.25 mm49 - 59 N.m15.0 - 6.0 kgl m, 36 - {3 lbtftl
19, Install the propeller shaft to the transfer assembly
by aligning the reference marks (4WD).
20.
8 x 1.25 mm32 N.m (3.3 kgt'm,2ir blft)
Feplace.
\
@_
PROPELLER SHAFT
lnstall the shift cable.
4WD:
Install the shift cable with the control pin, then
secure it with the snap Din. Do not bend the shift
cable excessivelv.
CONTROLLEVER
SHIFT CAALECOVER
8 x 1.25 mm22 N.m 12.2l'gl m,16 rbt.ftl
(cont'd)
REFERENCE MARKS
14-261
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Special Tools
Ret. No.Tool NumberOescriptionotvPage Reler€nce
o
@aa
@/il
tol
J - 38592
07GAD - PH7020'1
07JAB - 0010204
OTRAB _TB40lOB
07749 - 0010000
07965 - 6920101
Transfer Case Oil Seal lnstaller
Seal Driver
Holder Handle
Flange Holder
Driver
Hub Dis/Assembly Tool
1
1
1
1
1
1
15-20
15-19
tc-zt, z9
15-21,25
15-19
15-19
6\
@
15-2
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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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Description
Hydraulic Flow
Forward Start and Acceleration l4WD)During a forward start and forward acceleration, the dual pump system can engage four wheel drive.lf the front wheels spin faster than the rear wheels, the front oil pump spins faster than the rear oil pump. The front pump
draws fluid through check valve B and discharges it. Some of the discharged fluid is drawn in the by the rear oil pump.The remaining fluid will pass through check valve E into the clutch piston. There, hydraulic pressure is regulated by twoorifices.
The regulated hydraulic pressure at the clutch piston pushes the plates and discs of the clutch together to form a connec-tion. The engaged clutch then passes driving force from the transfer assembly to the rear wheels, producing 4WD.
oRrFtcEsFRONT OIL PUMPREAR OIL PUMP
Forward Driving at Constant Speed lzWD)When driving forward at a constant speed (cruising), the dual pump system functions in two wheel drive mode.The rotation speed of the front and rear wheels is the same, so the speed of the front and rear pumps is also the same.Fluid discharged by the front oil pump is drawn in by the rear oil pump and is circulated through the system. Becausethere is no pressure built up at the clutch piston, the clutch does not engage, and the vehicle remains in 2WD (front wheeldrive).
FRONT OIL PUMP
15-6
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Forward Deceleration l2WDl
During forward deceleration, the dual pump system functions in two wheel drive mode.
Because of braking characteristics, the speed of the rear wheels may exceed the speed ol the front wheels during deceler-
ation. lf so, the rear oil pump spins faster than the front oil pump.
Fluid discharged by the rear oil pump is simply drawn in again by the rear pump and recirculated. Because there is no
pressure built up at the clutch piston. the clutch piston does not engage, and the vehicle remains in 2WD (front wheel
drive).
Reverse Start and Acceleration (4WD)
During reverse start and reverse acceleration, the dual pump system can engage four wheel drive.
lf the front wheels spin faster than the rear wheels, the front oil pump spins faster than the rear oil pump. The front oil
pump draws in fluid through check valve A and discharges it. {Note that in reverse, the direction of the pumps is the oppo-
site of that during forward driving.)
Some of the fluid that is discharged by the front oil pump is drawn in by the rear oil pump. The remaining fluid passes
through check valve F into the cylinder of the clutch piston, where it is regulated by two orifices.
The regulated hydraulic pressure at the clutch piston may force the plates and discs of the clutch together to form a con-
nectlon. The engaged clutch passes driving force from the transfer assembly to the rear wheels, producing 4WD.
oRtFtcEsFRONT OIL PUMP
{cont'd)
15-7
REAR OIL PUMP
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Description
Hydraulic Flow (cont'dl
Reverse Driving at Constant Speed l2WD)when driving in reverse at a constant speed, the dual pump system functions in two wheel drive mode.The rotation speed of the front and rear wheels is the same, so the speed of the front and rear pumps is also the same,Fluid discharged by the front oil pump is drawn in by the rear oil pump and is circulated through the system. But, becausethe there is a difference in the capacity between the two pumps, fluid flows through check valve E, and then through ori-Iices. This fluid lubricates and cools the clutch assembly and bearings.ls this condition, only a low pressure is built up at the clutch piston. Therefore the clutch does not engage, and the vehicleremains in 2WD (front wheel drive).
Reverse Deceleration l/tWDl
During reverse deceleration, the dual pump system can engage four wheel drive.When decelerating in reverse direction, the speed of the rear wheels may exceed the speed of the front wheels (due toengine braking). In this condition, the rear oil pump draws fluid through check valves B and C. Fluid discharged from therear oil pump then flows through check valve E to the clutch piston. There, pressure is regulated by two orifices.The regulated hydraulic pressure at the clutch piston may force the plates and discs of the clutch together to form a con,nection. The engaged clutch passes driving force from the transfer assembly to the rear wheels, producing 4WD.
oRtFtcEsREAR OIL PUMP
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Propeller Shaft
RemovaUlnstallation
1, Remove the propeller shaft protectors.
No. 1 PROPELLER SHAFT
PROPELLER SHAFTPROTECTOR
FLANGE BOLTI x 1 .25 mm22 N.m (2.2 kg{.m. 16lbl'ft)
2.
No. 2 PROPELLER SHAFT
FLANGE BOLT8 x 1.25 mm22 N.m 12.2 kgf.m, 16lbf.ft)
PNOPELLER SHAFTPROTECTOR
Mark the No. 2 propeller shaft and rear differsntial
across their joints as shown.
Remove the four 12-point bolts. and remove the No.
2 propeller shaft from the rear differential.
No.2 PROPELLERSHAFT12.POINT BOLT8 x 1.25 mm32 N.m 13.3 kst m, 24 lbtftl
REAR DIFFERENTIAL
16-30
4, Remove the center support bearing mounting bolts.
SELF-LOCK|NG BOLT uErr rEn Durrr.r'r I I'EAnrNu
10 x 1.25 mm39 N'm 14.0 kg{.rn,29 lbtftlReplace.
Mark the No. I propeller shaft and transfer assem-
bly across their joints as shown.
Remove the four 12-point bolts, and remove the No.
1 propeller shaft from the transfer assembly,
No. 'l PROPELLER SHAFT
o.
12.POINT BOLT8 x 1.25 mm32 N.m 13.3 kgt'm, 2,1 lbf.ft)
TRANSFERASSEMBLY
7. Install the propeller shafts in the reverse order of
removal. Make sure to align the marks on the pro-
p€ller shafts with the marks on the rear differential
and the transfer assemblv.
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