TRANSMISSION CLUTCH LEAKAGE
Check clutch pressures at low engine idle with oil at operating temperatures 180-200 F. [82,2-93,3 C].
Engine speed must remain constant during entire leakage check. Shift lever into forward 4 or 8 speeds. Record
pressures. Shift lever in reverse and 1st. Record pressure. All pressure must be equal within 5 p.s.i. [0,4 kg/cm]
If clutch pressure varies in any one clutch more than 5 p.s.i. [0,4 kg cm], repair clutch.
If a flow meter is available install in line coming out of converter pump. See flow diagram for location of
pressure on flow checks. Check pump volume at 2000 RPM and at low engine idle. Record readings. See pump
volume specifications at 2000 RPM.
Install flow meter in the line coming from transmission to converter. Check oil volume at 2000 RPM and at
low idle in the following speed selections. Record readings.
Forward - Low speed thru High
Reverse - Low speed
Subtract readings in each speed from pump volume reading to get transmission clutch leakage.
Pump Volume at idle
8 gal.
Pump volume
8 gal.
Example:
Forward - Low speed
Forward-Low speed thru High
6 gal.
6 gal.
Clutch leakage
Reverse-Low speed
6 gal.
2 gal.
If clutch leakage varies more than 1 gal. from one clutch to another, repair clutch.
LEAKAGE IN TRANSMISSION CLUTCHES
Leakage
in
3000 series
must
not
exceed
4
gal.
max.
Leakage
in
5000 series
must
not
exceed
4
gal.
max.
Leakage
in
8000 series
must
not
exceed
6
gal.
max.
Leakage
in
16000 series
must
not
exceed
7
gal.
max.
CONVERTER LUBE FLOW
Disconnect CONVERTER DRAIN BACK Iine at transmission with engine running at 2000 RPM and measure
oiI into a gallon container. Measure oil leakage for 15 seconds and multiply the volume of oil by four to get
gallons per minute leakage.
LEAKAGE IN CONVERTER
series not
to
exceed
2
gal.
max.
Leakage
in
C270
Leakage
in
C5000 series not
to
exceed
3
gal.
max.
Leakage
in
C8000 series not
to
exceed
5
gal.
max.
Leakage
in
C16000 series not
to
exceed
5
gal.
max.
LOW CLUTCH PRESSURE WITH NORMAL CLUTCH LEAKAGE
REMEDY
CAUSE
1. Fill to proper level.
1. Low Oil level.
2. Replace spring.
2. Broken spring in transmission regulator valve.
3. Clean valve spool and sleeve.
3. Clutch pressure regulator valve spool stuck in
open position.
4. See paragraph on charging pump output.
4. Faulty charging pump.
LOW CLUTCH PRESSURE WITH EXCESSIVE CLUTCH LEAKAGE
1. Replace sealing rings.
1. Broken or worn clutch piston sealing rings.
2. Clean bleed valve thoroughly.
2. Clutch drum bleed valve ball stuck in open
position.
3. Replace sealing rings.
3. Broken or worn sealing rings on clutch support.
4. See paragraph on charging pump output.
4. Low converter charging pump output.
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