1999 HONDA CR-V low clutch

Pressure Testing
(cont'd)
Line Proslure, lst Clutch, lst.hold Clutch prsssuro Measuromont
1. Start the engine, and shift to E or @ position.
2. Run the engine at 2,000 rpm, then measure line pressure. Higher pressure may be indicated if measurements aremade in shift lever positions other than E or @ position.
shift to E ('97 - 98) or E ('99 - oo) position and hold the engine at 2.ooo rpm, then measure 1st clutch pressure.
Shift to E position and hold the engine at 2,000 rpm, then measure lst-hotd ctutch Dressure.
LOCK.UP CONTROLSOLENOID VALVEA/B ASSEMBLY
4.
PRESSURESHIFT LEVER
POSmONSYMPTOMPROBABLE CAUSEFLUID PRESSURE
StandaldService Limit
LineEor@No (or low)
line pressure
Torque converter.
ATF pump, pres-
sure regulator,
torque converter
check valve
830 - 880 kPa(8.5 * 9.0 kgflcm,,
120 - '130 psi)
780 kPa
{8.0 kgf/cm,, 'l10 psi)
1st ClutchE (97 - 98)
E ('se - oo)
No or low 1st
pressurelst Clurch
lst-hold
ClutchtrNo or low lst-
hold pressure1st-hold Clutch
14-162
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znd, 3rd, and ,lth Clutch Pressurs Measuremenl'97 - 98 Modols:
1. Stan the engine, and shift to E position.
2. Run the engine at 2,000 rpm, then measure 2nd
clutch pressure.
3. Shift to E position, and hold the engine at 2'000
rpm, then measure 3rd clutch pressure.
4. Shift to E position, and hold the engine at 2,000
rpm, then measure 4th clutch pressure.
5. Shift to @ position, and hold the engine at 2,000
rpm, then measure 4th clutch pressure.
4TH CLUTCH PRESSUREINSPECTION HOLE
'99 - 00 Models:
1. Start the engine, and shift to El position.
2. Run the engine at 2,000 rpm. then measure 2nd
clutch pressure.
3. Shift to E position, and turn the Over-Drive (O/D)
OFF by pressing the O/D switch (O/O OFF indicator
light comes on).
4. Hold the engine at 2,000 rpm, then measure 3rd
clutch Pressure.
5. Turn the Over-Drive ON by pressing the O/D switch
(O/D OFF indicator light goes out), and hold the
engine at 2,000 rpm, then measure 4th clutch pres-
sure.
6. Shift to E position, and hold the engine at 2,000
rpm, then measure 4th clutch prgssure
2ND CLUTCH PRESSUREINSPECTION HOLE
3RD CLUTCH PRESSUREINSPECTION HOLE
'"r.,-ur"" "..#
- -t"1' -.
INSPECTION HOLE
PRESSURESHIFT LEVER
POSmONSYMPTOMPROBABLE CAUSE
FLUID PRESSURE
StandardServico Limit
2nd ClutchtrNo or low 2nd
pres$ure
2nd Clutch800 - 850 kPa
\A.2 - 8.1 kgtlcm2,'120 - '124 psil
760 kPa
(7.7 kgf/cm', 110 psi)
3rd ClutchE (97 - s8)
Elwith Over-
Drive is OFF(99 - 00)
No or low 3rd
pressure
3rd clutch
4th clutchE (97 ,98)
E (99 - oo)
No or low 4th
pressure
4th Clutch
EServo Valve or 4th
Clutch
14-163
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End Cover
Removal
NOTE:
o The illustration shows the 4WD automatic transmission; the 2WD is similar.. cleanall parts thoroughly in solvent or carburetor cleaner, and drythem with compressed air.. Blow out all passages.
. When removing the transmission end cover, replace the following:- End cover gasket- Lock washer- O-rings- Shaft locknuts- Conical spring washers- Sealing washers
END COVER GASKET
MAINSHAFT LOCKNUT
CONICAL SPRING WASHER
6 x 1 .0 rhm EOLTS
PARK PAWL
A/T GEAR POSMONSwlTCH COVER
NEEDI.T BEARING
SUB.SHAFT LOCKNUT
CONICAL SPRINGWASHER
LINE AOLT
ATF COOI.f B LINES
14-186
PAwL 7// Locx wASHER
'sHAFr 9/ ?ARK srop
o-- Ay' couNTERsHAFr
G-€ LocKNUr!€ / ..t,"o, "oo
A/T GEAR POSMONSW|TCH HARNESS CLAMP
CONICAL SPRINGWASHCR
A/T GEAR POSITION
PARK GEAR
Y CLUTCH
lST GEAR
NEEDLE BEARING
1ST CLUTCH ASSEMBLY
THRUST WASHER
THRUST NEEDLE AEARING
O.RINGS
\\
SUB.SHAFT 1ST GEAR
MAINSHAF? 'ST GEAR
MAINSHAFT 1STGEAR COLLAR
SEALING WASHERS
!€'-l
I"EVERSPRING
COUNTERSHAFTlST GEAR COLLAR
PAWL
lt1/ sroe
Y plwl f
L/'SPRING
LOCKNUT
LINE BOLTSEALING WASHERS
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Gountershaft
Disassembly/Reassembly
1. Remove the reverse selector hub and countershaft
4th gear using a universal two-jaw lor three-jaw)
puller as shown. Place a shaft protector between
the puller and countershaft to prevent damaging
the countershaft.
{Commercially available)
REVERSESELECTOR HUB
.TH GEAR
14-206
2. Assemble the parts on the countershaft as shown
below.
NOTE;
. Lubricate all parts with ATF during reassembly.
. Before installing the O-rings. wrap the shaft
splines with tape to prevent damaging the O-
rings.
4TH GEAR
BEARI'{G
DISTANCE COLLAR, 28 mmSelective oart
GEAR
THRUST ]{EEOL€ AEARIIIG
GEAR COLLAR
THRUST I{EEDLE EEARII{G
WASHER
3RO CLUTCH ASSEMBLY
SEARII{G
O-RINGSReplace.
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One-way Glutch
Disassembly/lnspection/Reassem bly
1. Separate countershaft 1st gear from the park gear
by turning the park gear in the direction shown.
PARK GEAR
2. Remove the one-way clutch by prying it up with the
tip of a screwdriver.
COUNTERSHAFT IST GEARONE.WAY CLUTCHInstall in this direction.
ONE.WAY CLUTCH
lST GEAR
COUNTERSHAFT lST GEAR
SCREWDRIVER
14-209
3. Inspect the oarts as follows;
PARK GEARInspect Ior wearand sconng.
ONE.WAY CLUTCHInspect for damageand taulty movement,
4.
lST GEARInspect for wearand scortng.
After the parts are assembled, hold countershaft lstgear. and turn the park gear in the direction shown
to be sure it turns freely. Also make sure the park
gear does not turn in the opposite direction.
COUNTERSHAFT ,IST GEAR
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Glutch
Reassembly
NOTE:
. Clean all parts thoroughly in solvent or carburetorcleaner, and dry them with compressed air.. Blow out all passages.
o Lubricate all parts with ATF before reassembly.
1. Inspect the check valve; if it's loose, replace the pis_ton.
CHECK VALVE
2. Install new O-rings on the clutch piston.
PtsTot{
14-218
3. Install th€ piston in the clutch drum. Apply pressure
and rotate it to ensure proper seating, Lubricate thepiston O-ring with ATF betore insta ing the piston.
NOTE: Oo not pinch the O-ring by installing the pis_ton with too much force.
CLUTCH DRUM
Install the return spring, and spring retainer, thenposition the snap ring on the retainer.
4.
SI{AP RING
SPAI'{G RETAIIIER
REIURN SPRING
CLUTCH DRUM
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13. Measure the clearance between the clutch end plate
and top disc with a dial indicator. Zero the dial indi-
cator with the clutch end plate lowered, and lift it up
to the snap ring. The distance that the clutch end
plate moves is the clearance between it and the top
dtsc.
NOTE: Take measurements in at least three places'
and use the average as the actual clearance.
Clutch End Ptate-to-Top Disc Clearance:
ClutchService Limit
'l st
2nd
3rd
4th
lst-hold
0.65 - 0.85 mm (0.026 - 0.033 in)
0.40 - 0.60 mm (0.016 - 0.024 in)
0.40 - 0.60 mm (0.016 - 0.024 in)
0.40 - 0.60 mm (0.016 - 0.024 in)
0.50 - 0.80 mm (0.020 - 0.031 in)
SNAP RING
lf the clearance is not within the service limits, select
a new clutch end plate from the following table
NOTE: lf the thickest clutch end plate is installed,
but the clearance is still over the standard, replace
the clutch discs and clutch plates.
MARK
I I rnictness
--:--l----T
14.
CLUTCH END PLATE
14-221
lST CLUTCH END PLATES
2ND and 4TH CLUTCH END PLATES
3RD CLUTCH END PLATES
lST-HOLD CLUTCH END PLATES
MarkThicknass'I22551 P56 - N002.1 mm (0.083 in)
222552-P56-N002.2 mm (0.087 in)
322553 - P56 N002 3 mm (0.091 in)
22554-P56-NOo2.4 mm (0.094 in)
522555 P56 - N002.5 mm {0.098 in)
622556 P56 - N002 6 mm (0.102 in)
722557 - P56 N002.7 mm (0.106 in)
822558 - P56 N002.8 mm (0.110 in)
I22559 - P56 N002.9 rnm (0.114 in)
1022s60 - P56 N003.0 mm (0.118 in)
MarkParl NumberThickness
622556-P56-N002.6 mm (0.102 in)
122557 P56 - N002.7 mm (0.106 in)
822558-P56-N002.8 mm (0.110 in)
22559-P56-N002.9 mm (0.114 in)
1022560 - P56 N003.0 mm (0.118 in)'1122561 PDM - 0003.1 mm (0.122 inl
1222562 - PDM - 0003.2 mm {0.126 in)
1322563 PDM - 0003.3 mm (0.130 in)
22564 PDM - 0003.4 mm (0.134 in)
22565 PDM - 0003.5 mm (0.138 in)
22566 PDM - 0003.6 mm 10.142 in)
1722567-PDM-0003.7 mm (0.146 in)
MarkPart NumberThiclness
I22558 P56 - N002.8 mm (0.110 inl
922559 P56 - N002.9 mm (0.114 in)
1022560 P56 - N003.0 mm (0.118 in)
1122561 PD[4 - 0003.1 mm (0.122 in)
1222562 - PDM 0003.2 mm (0.126 in)
t322563-PDM-0003.3 mm (0.130 in)'1422564-PDN4-0003.4 mm (0.134 in)
1522565-PD[,l-0003.5 mm (0.138 in)
22566 PDM - 0003.6 mm (0.142 in)'t122567 - PoM - 0003.7 mm {0.146 in)
Thickness
2255r-PS5-0032.1 mm (0.083 in)
22552 - PS5- 0032.2 mm {0.087 in)
322553 PS5 - 0032.3 mm (0.091 in)
22554, PS5 - 0032.4 mm (0.094 in)
22555 PS5 - 0032.5 mm (0.098 in)
622556 PS5 - 0032.6 mm {0.102 in)
722557 - PSs 0032.7 mm (0.106 in)
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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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