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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 Transmission Call us: 1-407-295-1221

M - CLUTCH(ES) SLIPPING - AT 540/542/1542/543/545/1545* Condition Probable Causes Suggested Remedies Slipping in Fourth and Reverse Ranges Only 1. Fourth clutch defective. 1. Overhaul clutch and replace piston seals. 2. Trimmer valve sticking. 2. Overhaul trimmer valve. 3. Sealrings on center support assembly hub worn or broken. 3. Replace sealrings. 4. Clutch piston sealrings damaged. 4. Replace sealrings. 5. Centrifugal check balls in fourth clutch housing not seating. 5. Inspect check balls for contamination and proper operation. Slipping in First and Reverse; OK in Other Forward Ranges 6. First clutch defective. 6. Overhaul clutch and replace piston seals. 7. Piston sealrings damaged. 7. Replace sealrings. 8. Clutch-apply tube loose and leaking. 8. Inspect tube and reset or replace if necessary. * NOTE: If unit is modified for split shaft PTO, all external circuitry must be removed before troubleshooting.