2000 HONDA CR-V valve cle

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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Component Locations
lndex
Note these items during disassembly:' lf an intact airbag assembly has been removed from a scrapped vehicle or has been found defective or damaged dur-ing transit, storage or service. it should be deployed (see section 24),a Before removing the gearbox, remove the driver.s airbag assembly and steering wheel.. After installing the gearbox, check the wheel alignment and adjust if necessary.
SRS components are located in this area. Review the SRS component locations, precautions, and procedures an the SRssection (24) before performing repairs or servrce.
STEERING WHEELRemoval, page 17,18Disassembly/Reassembly, page 1?,18Installation, page 17-19DRIVER'S AIRBAG ASSEMBLYRemoval/lnstallation, see section 24
STEERING GEARBOXRack Guide Adjustment, page 17-15Removal, page 17-31Disassembly, page 17-34Reassembly, page 17,40Installation, page 17,51VALVE BODY UNITOverhaul, page 17-38
STEERING COLUMNRemoval/lnstallation. page 17-20Inspection, page l7 21Steering Lock Replacement, page 17 22CABLE REELRemoval/lnstallation, see section 24tcNrnoN swtTcHSee s€ction 23
STEERING HOSES, LINESReplacement. page l7-23
Pump Belt Inspection andAdjustment, pag€ t7-14Pump Pressure Check, page 17-16 ot 17-1jReplacemont, page 17-24Disassembly, pa96 17,25Inspection, page 17-26Reassembly. page17-28
RESERVOIRFluid R6placement. page 17 15Fluid Leakage lnspection, page 17-23
END BALL JOINTBallJoint Boot Replacement, page 17-50
17-3
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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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Troubleshooting
Noise and Vibration
NOTE: Pump noise in first 2 - 3 minutes after starting in cold weather is normal.
Humming
Rattle or chattering
Humming due to pulsation of fluid is normal, particularly when the wheel isturned with the vehicle stooDed.
lf equipped with automatic trans-mission, the hum could be thetorque converter or pump noase.
Confirm by temporarily removingthe pump belt.
Feed hose (high-pressure) touch-ing the frame.Beposition the feed hose.
Loose steering shaft connector,tie-rod, or balljoint.Check and tighten, or replaceparts as necessary,
Column shaft wobbling.Roplace the column assembly.
Check the rack guide for properadjustment (see page 17-15).Adjust, if necessary.
Rattling sound and feeling when turning the steering wheel right and left with th€engine OFF is normal.
Pump noise, though not loud, from the valve body unit can be heard when turn-ing the steering wheel to full lock in either direction. This is normal. Do not holdthe steering wheel at full lock lor more than five seconds when inspecting.
17-8
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5. Submerge the valve in a container of power steer-
ing fluid or solvent, and blow in the hose. lf air bub-
bles leak through the valve at less than 98 kPa
(1.0 kgflcm', 14.2 psi), repair it as follows ('97 model).
For'98 - 00 models, the flow control valve cannot
be disassembled; replace the pump as an assembly
AIR PRESSURE
POWER STEENINGFLUID or SOLVENT
6.For'97 model only, hold the bottom end of the
valve with a open end wrench. Unscrew the seat in
the top end of the valve, and remove any shims, the
reliel check ball, relief valve and relief valve spring.
RELIEFALVE
RELIEF CHECK BALL
{w@r
7.
SEAT9 N.m(0.9 kgf.m, 6.5 lbfft)
RELIEF VALVESPRING
FLOW CONTBOL VALVE
Clean all the parts in solvent, dry them otf, then
reassemble and retest the valve.
The relief pressure is adjusted at the factory by
adding shims under the check ball seat lf you found
shims in your valve, be sure you reinstall as many
as you took out.
lf the flow control valve tests OK, reinstall it in the
pump. It the flow control valve still leaks air, replace
the pump as an assembly. The flow control valve is
not available separately.
8,
Hold this end witha open eno wrencn.
Ball Bearing:
'1. Inspect the ball bearing by rotating the outer race
slowly. lf any play or roughness is felt, replace the
ball bearing.
2. Replace the ball bearing using a press.
Removelnstall
Press
I
Press
I
lnstall with thered shaelded sidefacing down.
NOTEr SuPPort the inner race
with the tool securelY-
BALL EEARING
17-27
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Power Steering Gearbox
Removal
Note these items during removal:
. Using solvent and a brush, wash any oil and dirt off
the valve body unit its lines, and the end if the gear-
box. Blow dry with compressed air.
. Be sure to remove the steering wheel before discon-
necting the steering joint. Damage to the cable reel
can occur.
. With 4WD. tilt the engine with a jack to expand the
clearance between the transfer assembly and rear
beam when removing the steering gearbox from the
rear oeam.
Do not remove the steering gearbox by removing the
transfer assembly from the transmission.
1. Drain the power steering fluid as described on page'17-15.
Raise the vehicle, and suppon it on safety stands in
the proper locations (see section 1).
Remove the front wheels,
Remove the drive/s airbag assembly {see section 24).
Remove the steering wheel {see page 17-18).
Remove the steering joint bolts, then disconnect the
steering joint by moving the joint toward the column.
UPPER JOINT BOLT
LOWER JOINT BOLT
13.
7. Remove the cotter pin from the nut, and remove the
castle nut {'97 - 98 models) or hex nut ('99 - 00
models).
COTTER PINReplace.
Install the 10 mm hex nut on the ball joint. Be sure
that the 10 mm hex nut is flush with the ball joint
pin end, or the threaded section of the ball joint pin
might be damaged by the special tool. Refer to sec-
tion 18 for ball joint remover usage instruction, Be
careful not to damaging the ball joint boot.
Separate the tie-rod ball joint and knuckle using the
special tool.
Remove the right and left tie-rod ends, then extend
the rack all the way to the right.
Remove the TWC (see section 9).
Disconnect the shift linkage from the transmission
(M/T: see section 13, A/T: see section 14).
With 4WD. separate the propeller shaft and transfer
assembly (see section 161.
10.
11.
(cont'd)
17-31
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Power Steering Gearbox
Reassembly
Note these items during reassembly
. Clean the disassembled parts with a solvent, and dry them with compressed air. Do not dip the rubber parts in a sol-
vent.
. Always replace the O-rings and rubber seals with new ones before assembly.
. Apply the recommended power steering fluid to the parts indicated in the assembly procedures.
. Do not allow dust. dirt, or other toreign materials to enter the power steering system.
. Use the appropriate specialtools where necessary.
FLANGE BOLTS20 N.m (2.0 kgl.m, 14lbtftl
CYLINDER LINE AFLARE NUTS17 N.m 11.712 rbl.ftl
VALVE HOUSING
CYLINDER END SEALReplace.
VALVE OIL SEALBeplace.
ROLLER BEARING
CIRCLIPReplace.
BA.KUP RING
\/^"
WAVE WASHERBACKUP RINGReplace.97 model:HOUSING
VALVE SEAL RINGReplace.
O.RINGReplace.
32 mm SHIMS'97 mod6l only:
RACK GUIDE SCREW
O-RINGReplace.
@---r-ocxr'rur
'97 model:
'98 model:
'99 - 0O mod6ls:'9? model only:
CYLINDER END69 N.m (7.0 kgf.m, 51 lbf.ft)'98 - (x) models:
PISTON SEAL RINGReplace.
17-40
STEERING RACK
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