2. Raise the front of the vehicle so that the drive wheels can turn freely.
3. Connect the tachometer and position it so that it is clearly visible.
4. Connect a special test gauge 09452-21500 with adapter 09452-21002 to each oil pressure port.
For reverse pressure, a pressure gauge with a measurement range of 3,000 kPa must be used.
5. Measure the transmission fluid pressure at various selector lever positions and engine speeds. If the pressure does not meet the required values, check and repair the gearbox elements.
Transmission Fluid Pressure Reference Values
№ | State | Standard transmission fluid pressure, kPa | ||||||||||
Selector positions | Speed km/h | Speed of rotation of the crankshaft | Selector lever position | 1 Down pressure | 2 Kickdown brake pressure | 3 Front clutch pressure | 4 Pressure in outlet sleeve | 5 Pressure V brake lower per. and Z.Kh. | 6 Pressure incl. damping clutch | 7 Pressure off damper couplings | 8 Rear clutch pressure | |
1 | N | 0 | H.H. | Neutral. | 400–440 | — | — | — | — | — | — | |
2 | D | 0 | H.H. | 2nd lane | 400–440 | 58–147 | — | — | — | — | — | — |
3 | D (SW-ON) | 110 | 2500 | 4th lane | 400–440 | 637–695 | — | 650–710 | — | 637–793 | — | 833–911 |
4 | D (SW-OFF) | 75 | 2500 | 3rd lane | 400–440 | 840–900 | 813–872 | 833–911 | — | 637–793 | — | 833–911 |
5 | 2 | 50 | 2500 | 2nd lane | 400–440 | 840–900 | — | — | — | 637–793 | — | |
6 | L | 0 | 2500 | 1st lane | 400–440 | — | — | — | 235–294 | 245–400 | 510–610 | 833–911 |
7 | R | 35 | 2500 | 3.x. | 420–480 | — | 1,666–2,058 | — | 1,666–2,058 | 245–450 | 450–646 | 833–911 |
Preliminary actions if oil pressure is abnormal
Symptom | Probable Cause | Actions |
1. Line pressures are very low (or high). See pressure values in columns 2, 3, 4, 5, 6, 7, 8 of the table «Transmission Fluid Pressure Reference Values» | 1. Oil filter dirty 2. Incorrect adjustment of the main pressure regulator valve | • Visually inspect the oil filter and replace if necessary. • Check pipeline pressures according to criterion 2 • Check the function of the regulator valve and |
Line pressures are very low (or high). | • Stuck regulator valve • Loose valve body • Incorrect pressure at the outlet of the oil pump | • Check the function of the regulator valve • Tighten the valve body mounting bolts and set bolt • Check the end play of the oil pump gear and replace the oil pump if necessary |
Inappropriate pressure reduction | • Incorrect pipeline pressure • Clogged filter (L-type) • Incorrect reduction pressure setting • Reducing valve stuck • Loose valve body | • Check the pressure according to criterion 2. If the pressure • Dismantle the valve body, check the condition of the • Check the down pressure 1. If the • Check the function of the reducing pressure and, if necessary, replace the valve body • Tighten the valve body mounting bolts and set bolt |
Incorrect kickdown brake pressure | • Damaged B-ring, o-ring, bushing or kickdown servo piston • Loose valve body • Functional valve body failure | • Remove the kickdown servo piston and check the condition of the o-ring and D-ring. If there are scratches, replace the D-ring or O-ring • Tighten the valve body mounting bolts and set bolt • Replace valve body |
Incorrect front clutch pressure a | • Damaged D-ring, bushing or gray • Loose valve body • Damaged valve body • Worn front • Damaged oil pump gasket or O-ring (2) | • Remove the kickdown servo piston and check the condition of the O-ring. If scratched • Tighten the valve body mounting bolts and set bolt • Replace valve body • Disassemble the transmission and check for wear on the front clutch piston, detent inner circle, or damage to the D-ring. If there is wear and |
Improper final drive clutch pressure | •D-ring, O-ring • Loose valve body fasteners • Damaged valve body | • Dismantle the output sleeve and check the condition of the D-ring • Tighten the valve body mounting bolts and set bolt • Replace valve body |
Low pressure low brake and reverse gear | • Damaged seal between valve body • Loose valve body fastening • Damaged valve body • The O-ring of the downshift and reverse gear brakes or the O-ring of the retainer is damaged | • Remove the valve body, check the condition of the seal and, if necessary, replace it • Tighten the valve body mounting bolts and set bolt • Replace valve body • Dismantle the gearbox, check the condition of the O-ring and replace it if necessary |
Incorrect torque converter pressure | • Jamming of the torque converter damping clutch control solenoid valve (DCCSV) • Clogged or leaking oil cooler and/or lines | • Check dampening clutch and DCCSV operation • Repair or replace the heatsink and/or |
Incorrect torque converter pressure | • Damaged O-ring • Damaged torque converter | • Dismantle the gearbox, check the condition of the O-ring and replace it if necessary |
Inappropriate reverse clutch pressure | • Damaged D-ring, o-ring • Loose valve body fastening • Damaged valve body | • Replace torque converter • Dismantle the final drive clutch and check • Tighten the valve body mounting bolts and set bolt • Replace valve body |
Incorrect shock absorber clutch pressure | Probably the same reason as the reason for the damping clutch control pressure failure | Probably the same method of elimination as the elimination of the cause of the violation of pressure by the control of the damping clutch |