oil pressure HONDA CR-V 1999 RD1-RD3 / 1.G Owner's Manual

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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Rear Differential Assembly
lllustrated Index
O.RINGReplace.
6xl.0m12 N.m (1.2 kgf m,8.7 lbt'ftl
BACK-UP RING
COMPANION FLANGE
CLUTCH HUB/PLATES/DISCS
DIFFERENNAL CLUTCHASSEMBLY
DOWEL PINS
OIL PUMP DRIVESHAFT
LOCKNUT, 24 mmReplace.118 N.m (12.0 kgtm.87 rbt ft)
OIL SEALReplace.
PRESSURE PLATE
THBUST NEEDLEAEARING""t",at\(
'd'
CLUTCH GUIDE
OIL PUMPPIN
e
MAGNET
6x1.0mm12 N.m 11.2 kgt'm,8.7 lbf'ft|
OIL STRAINER
15-15
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Rear Differential Assembly
Disassembly (cont'dl
9. Remove the shim and the clutch quide.
d"HIM'30mm
CLUTCH GUIDE
Remove the clutch hub/plates/discs and the pressure
prare.
10.
CLUTCH HUB/PLATES/OISCS
k
ffi-:*
_zz PRESSURE PLArE
@-
15-22
11. Remove the thrust needle bearing and the oil pump
driveshaft.
Remove the oil pump body assembly, the oil pump
pin, the magnet, and the oil strainer.
OIL PUMP BODY ASSEMBLY
MAGNET
OIL PUMP PIN
12.
OIL STRAINERInspect for damageor clogging.
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Reassembly
1. Apply CVT fluid to the rubber of the oil strainer, then
install the oil strainer, the magnet, and the oil pump
pin to the differential carrier.
OIL PUMP PIN
DIFFERE]TTIAL CARRIERASSEMBLY
Align the oil pump pin with the groove of the rear oil
pump in the pump body assembly, then install the oil
pump body assembly to the differential carrier assem-
oty.
-n
CWfluid
2.
MAGNET
OIL PUMP BODY ASSEMBLY
3. Tighten the oil pump body assembly mounting
bolts.
4. Install the oil pump driveshaft by aligning the pro-
jection of the oil pump driveshaft with the groove of
the front oil pump in the oil pump body assembly.
lnstall in this direction.
Projection
6x1.0mm12 N.m 11.2 kg{.m,8.7 lbl.ft}
Install the thrust needle bearing.
Install the pressure plate assembly by aligning the
projection of the pressure plate with the groove of
the oil pump driveshaft.
5.
OIL PUMPDRIVESHAFT
(cont'd )
15-23
THRUST NEEDLE BEABING
PRESSURE PLATE
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Uneven or rough steering.Ad,ust the rack gu ide (see page 17- 15).
ll the problem is not corrected byadjusting the rack guide, replacethe gearbox.
Adjust the belttension. Replace thebelt, if necessary (see page 17-14).Belt slipping on pulley.
lf the engine stalls when thewheel is turned while the vehicleis stopped or moving at lowspeed, adjust the idle speed (seesection 111.
ldle speed low or erratic.
Check power steering lluid level. lfthe level is excessively low checkfor leaks in the system. Add fluidto the specified level.
Air in reservoir, or check powersteering tluid level.
lf fluid level is OK, check O-ringsand seals on both ends of thepump inlet hose, and the P/Spump housing mating surlacesand drive shaft oil seal for suction leaks. Check the reservoir forcracks, Replace parts as neces-
Pump belt slipping on pulley(pump stops momentarily).Adjust the belt tension (see page17-14) or replace belt.
Check if pump pressure is normaland the gauge needle travel is 500kPa (5 kgl/cm,, 71 psi) or less.Check the flow control valve if theneedle travel exceeds 500 kPa (5kgflcm', 71 psi). lI the flow controlvalve is normal, replace the pumpas an assembly,
Install the power steering pres-sure gauge, Close the pressurecontrol valve and shut off valve (if
so equipped) fully and measurethe pump pressure (see page 17-16ot 17 17).
Steering wheel kicks backduring wide turns.
7-7
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Disassembly/ Inspection
Disass.mbly
1. Compress the damper spring with a spring com-
pressor according to the manufacturer's instruc-
tions, then remove the self-locking nut. Do not com-press the spring more than necessary to remove the
nur.
10 mm SELF-LOCKINGReplace.
STRUTCOMPRESSOR:lComm6rcially availablo)BRANICK@ T/N MST-580Aor Mod6l 7200or equivalent
Release the pressure from the spring compressor,
then disassemble the damper as shown in the next
cotumn.
Inspection
1.Reassemble all parts, except for the spring.
Push on the damper assembly as shown.
Check for smooth operation through a full stroke,
both compression and extension. The damper
should move smoothly. lf it does not (no compres-
sion or no extension), the gas is leaking, and the
damper should be replaced.
Check for oil leaks, abnormal noises, or binding dur-
ing these tests.
2.
29 N.m (3.0 kgl.m,22lbtftlReplace.
DAMPER MOUNTING WASHER
DAMPER MOUNTING
SELF-LOCKING NUT10 x 1.25 mm
RUBBERCheck forano oamage.
DAMPER MOUAMNG COLLAR
DAMPER MOUNTINGBASE
DAMPER MOUNTINGRUBBERCheck for det€riorationano oamage.
BUMP STOP PLATE
DUSTCheckfor bending and damage.
..rgBUMPSTOP g
weakness anddamage,
SPRING MOUNTING
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Rear Damper
Disassembly/lnspection
Disassembly
L Compress the damper spring with the spring com-
pressor according to the manufacturer's instruc-
tions, then remove the self-locking nut. Do not com-
press the spring more than necessary to remove the
self-locking nut.
SELF-LOCKING NUT10 x 1.25 mmReplace.
STRUT SPRINGCOMPRESSOR:lCommercirlly avaihblo)BRANICKO I/N MSI-580Aor Mod6l/7200 or equivalent
2. Release the pressure from the spring compressor,
then disassemble the damper as shown on page 18-
25.
Inspection
1. Reassemble all parts, except the spring.
2. Push on the damper as shown.
3.
WOODEN ELOCK
Check for smooth operation through a full stroke,
both compression and extension. The damper
should move smoothly. lf it does not (no compres-
sion or no extension), the gas is leaking, and the
damper should be replaced.
Check for oil leaks, abnormal noises, or binding dur-
ino these tests.
4.
SELF-LOCKING NUT10 x 1.25 mm
OAMPERMOUNTINGWASHER
29 N.m {3.0 kgf.m, 22 lbf.ft)Beplace.
OAMPER MOUNTINGRUBBERCheck fordeteriorationano oamage.
DAMPER MOUNTINGCOLLAR
DAMPERMOUNTING BASE
DAMPER MOUNTINGRUBBERCheck fordeteriorationano oamage.
'"dd"^.s"'
//F,
DAMPERCheck for weakness,compressron
DUST COVER PLATE
DUST COVERCheck for bendingand damage.
SPRING MOUNTINGRUBBERCheck Ior deteriorationand damage.
BUMP STOPCheck for weaknessano oamage.
DUST COVEN BOOTCheck for deterioralionano oamage.
BUMP STOP PLATE
DAMPER
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Wheel Sensor
The wheel sensors are the magnetic contactless type. As the gear pulser teeth rotate past the wheel sensor's magnetic
coil, AC current is generated. The AC frequency changes in accordance with the wheel speed. The ABS control unit detects
the wheel sensor signal frequency and thereby detects the wheel speed
at LOW SPEED
wheel Sp€od and Modulatot Control
VEHICLE SPEED
VEHICLE SPEED
WHEEL SPEED
PRESSU
OUTLETVALVE ON
OFF
INLETVALVE ON
OFF
MOTOR
ON
OFF
When the wheel speed drops sharply below the vehicle speed, the outlet valve opens momentarily to reduce the caliper
fluid pressure. The pump motor starts at this time. As the wheel speed is restored. the inlet valve opens momentarily to
increase the caliDer fluid oressure.
F
GEAR PULSER
19-31
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Description
The air conditioner system removes heat from the passenger compartment by circulating refrigerant through the systemas shown below.
High'temperature/ High-temperature/
high-pressure gas h igh-pressure liquid
Suction and compression Radiation of heat
High-temperature/
high-pressu re liq uidr raps oeons,
and removes
motsture
More liquidified
row-pressure vapor
EVAPoRAToR (-l EXPANSToN vAL
SUCTION LINEtLow-PRESSURE S|OEt
LIOUID LINE
CONDENSER
coMpREssoR Il- coruoerusenl* necetve
Less moisturized
low-pressure vapor
Absorption of heat
DISCHARGE LINEIHIGH.PRESSURE SIDEI
This vehicle uses HFC-I34a (R-l34a) refrigerant which does not contain chlorofluorocarbons. Pay attention to the follow-ing service items:
. Do not mix refrigerants CFC-12 (R-12) and HFC-l34a (R-134a). They are not compatible.. Use only the recommended polyalkyleneglycol (PAG) refrigerant oil (SP-10) designed for the R-134a compressor.Intermixing the recommended (PAG) refrigerant oil with any other refrigerant oil will result in compressor failure.. Afl Ay'C system parts (compressor, discharge line. suction line, evaporator, condenser. receiver/dryer, expansion valve,O-rings for joints) have to be proper for refrigerant R-134a. Do not confuse with R-12 parts.
. Use a halogen gas leak detector designed for refrigerant R-134a.. R-12 and R-134a refrigerant servicing equipment are not interchangeable. Use only a recovery/recycling/charging stationthat is U.L.iisted and is certified to meet the requirements of SAE J2210 to service R-134a air conditioning system.. Always recover the refrigerant R-134a with an approved recovery/recycling/charging station before disconnecting anylVC fitting.
EVAPORAYOR
22-7
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