APPENDIX B -- CHECKING CLUTCH AND RETARDER PRESSURES

WTEC III ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL

APPENDIX B -- CHECKING CLUTCH AND RETARDER PRESSURES

5. Be sure that transmission sump fluid temperature can be measured (Pro-Link 9000 diagnostic

tool may be used for this purpose).

6. Be sure that the transmission has enough fluid for cold operation until an operating temperature

fluid level can be set.

7. Bring the transmission to normal operating temperature of 7193C (160200F). Check for fluid

leaks in the added pressure gauge/transducer lines. Repair leaks as needed. Be sure that fluid level

is correct.

Recording Data

1. Use the Pro-Link 9000 diagnostic tool, which allows checking of individual range clutch pres-

sures, with the vehicle stationary. Consult Appendix G or the Pro-Link 9000 operating instruc-

tions for Action Request and select Clutch Test Mode. Follow instructions to check clutch pres-

sures in individual ranges.

NOTE:

Check lockup clutch pressure by driving the vehicle in a range where lockup can be obtained. Record

the pressure values at the engine speed and sump fluid temperature values shown in Table B1. The

lockup clutch is functioning correctly when engine speed and turbine speed values are equal as

recorded from the Pro-Link 9000.

2. Consult Table B1 and locate the transmission model that you are testing.

3. Operate the transmission at the conditions shown in Table B1 and record engine speed, transmis-

sion sump fluid temperature, main hydraulic pressure, and clutch pressures in the ranges where a

problem is suspected.

Table B1. Clutch Pressure Test Conditions

Transmission Model/

Sump Fluid

Test Type

Engine rpm

Temperature

Range

Clutches Pressurized

All (except MD 3070)

580620

7193C

Neutral

-- Idle Check

(160200F)

Reverse

C3 C5

C1 C5

2C (2nd range start)

C1 C4

MD 3070 -- Idle Check

580620

7193C

Neutral

(160200F)

Reverse

C3 C5

LowC

C3 C6

C1 C5

MD (except 3070)

20802120

7193C

Reverse

C3 C5

B 300/B 400 -- High Speed

(160200F)

Neutral

C1 C5

C1 C4

C1 C4 LU

C1 C3 LU

C1 C2 LU

C2 C3 LU

C2 C4 LU

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