Mechanical Faults without Trouble Codes
Note: Transmission
faults may be purely mechanical and do not always affect
transmission function. The following tables help to localise
faults.
Loud fluttering noise in selector lever position N
or P (stationary vehicle, engine running at idle speed)
|
Probable Cause
|
Remedy
|
Description in operation
|
Incorrect fluid level
|
Check fluid level
|
"Transmission Fluid Level, Check and Correct"
|
Converter malfunction
|
Replace converter
|
"Transmission, Replace"
|
Fluid pump malfunction
|
Check transmission fluid condition, disassemble and clean fluid
pump if necessary.
|
"Transmission Fluid Condition, Check", "Assemblies, Remove and
Install", "Fluid Pump, Disassemble and Assemble"
|
Internal transmission failure
|
Check transmission fluid condition, if necessary disassemble
transmission and correct fault.
|
"Transmission Fluid Condition, Check"
|
Mechanical Faults without Trouble Codes
(Continued)
Screeching noise in selector lever position N or P
(stationary vehicle, engine running at idle speed)
|
Probable Cause
|
Remedy
|
Description in operation
|
Loose fastening bolt on drive disc
|
Replace fastening bolt and tightening in accordance with
required tightening torque.
|
"Recommended Torque Values"
|
Broken drive disc
|
Replace drive disc
|
"Drive Disk, Remove and Install" in group "J".
|
Transmission not properly attached to engine
|
Check engine/transmission alignment, retighten fastening bolts
with required torque.
|
"Recommended Torque Values"
|
Converter scrapes transmission housing
|
Check transmission fluid condition, if necessary disassemble
transmission and correct fault.
|
"Transmission Fluid Condition, Check"
|
Internal transmission failure
|
Check transmission fluid condition, if necessary disassemble
transmission and correct fault.
|
"Transmission Fluid Condition, Check"
|
Mechanical Faults without Trouble Codes
(Continued)
Screeching noise when in gear (stationary vehicle,
engine running at idle speed)
|
Probable Cause
|
Remedy
|
Description in operation
|
Worn bushing in fluid pump
|
Check transmission fluid condition, if necessary replace fluid
pump.
|
"Transmission Fluid Condition, Check", "Assemblies, Remove and
Install", "Fluid Pump, Disassemble and Assemble"
|
Internal transmission failure
|
Check transmission fluid condition, if necessary disassemble
transmission and correct fault.
|
"Transmission Fluid Condition, Check"
|
Loud knocking or metallic noises in every gear
except for in 4th gear
|
Probable Cause
|
Remedy
|
Description in operation
|
Internal transmission failure
|
Check transmission fluid condition, if necessary disassemble
transmission and correct fault.
|
"Transmission Fluid Condition, Check"
|
Mechanical Faults without Trouble Codes
(Continued)
Leakage between engine and transmission when
vehicle is stationary and engine is running
|
Probable Cause
|
Remedy
|
Description in operation
|
Fluid level too high
|
Check fluid level
|
"Transmission Fluid Level, Check and Correct"
|
Transmission not properly attached to engine
|
Retighten fastening bolts with required torque.
|
"Recommended Torque Values"
|
Fluid pump bushing damaged or loose
|
Check transmission fluid condition, if necessary replace fluid
pump.
|
"Transmission Fluid Condition, Check", "Assemblies, Remove and
Install", "Fluid Pump, Disassemble and Assemble"
|
Fluid pump seal ring
|
Replace fluid pump seal ring
|
"Transmission, Replace"
|
Converter neck damaged or faulty
|
Replace converter and fluid pump seal ring
|
"Transmission, Replace"
|
Mechanical Faults without Trouble Codes
(Continued)
Leakage when vehicle is stationary
|
Probable Cause
|
Remedy
|
Description in operation
|
Leakage occurring at or around seals
|
Check axle shaft seals, fluid cooler lines and connections,
transmission housing and sealing points.
|
"Brake Band Servo Cover and/or Seal, Replace", "Seal Ring
– Selector Lever Shaft for Transmission, Replace", "Seal Ring
in Transmission Nose Piece, Replace", "Transmission Nose Piece,
Seal or Replace", "Transmission Fluid Pan (Main Housing), Remove
and Install and/or Replace Seal", "Transmission Fluid Pan
(Intermediate Housing), Remove and Install and/or Replace Seal",
"Sensor – Transmission Output Speed and/or Seal Ring,
Replace", "Fluid Cooler Lines (Feed and Return) –
Transmission, Remove and Install", or "Assemblies, Remove and
Install".
|
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