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Our large inventory of OEM Allison Transmission Parts includes
a large line of new and rebuilt Allison automatic transmissions, and
Allison Automatic transmission cores. All transmission parts can be shipped
the same day in most cases. Call our Sales and Service Departments 1-407-295-1221 or Email
Troubleshooting Charts For Allison
Transmissions AT / MT (B) / HT / V
The troubleshooting information
contained in the following charts outlines the possible causes
of transmission conditions and their remedies. Several possible
causes are indicated; numbered items indicate suggested remedies
for the causes. For Sales and Service Call America's #1 Supplier
of OEM Allison Transmission Parts and Authorized Allison Dealer;
TransDiesel Toll-Free: 1-800-422-1220,
F - CLUTCH(ES) SLIPPING*
and Chatter in Only One Range
Specific clutch defective.
Rebuild the specific clutch.
Specific clutch piston seals leaking.
Rebuild specific clutch and piston assembly.
Transmission fluid leaking past control valve components
for specific gear.
Replace or rebuild control valve body assembly.
Trimmer valve stuck open.
Replace or rebuild trimmer valve.
Cycling priority valve.
Replace or rebuild control valve body assembly. Inspect
in All Forward Ranges
Transmission fluid level low.
Add transmission fluid to proper level. (Be sure dipstick
calibration is correct for specific model.)
Main pressure low.
Refer to Chart E, Low Pressures.
Forward clutch defective.
Rebuild forward clutch.
Sealrings on front support hub worn or broken.
Lubrication valve stuck open. (Not applicable for AT
s and V s.)
Inspect valve for contamination and proper operation.
Centrifugal check balls not seating (forward and/or fourth
Inspect check balls for contamination and proper operation.
NOTE: If unit is modified for split shaft PTO, all external
circuitry must be removed before troubleshooting.
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