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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

H - OVERHEATING IN ALL RANGES Condition Probable Causes Suggested Remedies Overheating in All Ranges 1. Cooler lines restricted. (Can also cause excessive fuel consumption.) 1. Remove restrictions; clean or replace lines. (Refer to vehicle service manual.) 2. Broken parts in converter. (Can also cause excessive fuel consumption.) 2. Replace or rebuild converter assembly. Note: Welded converter assemblies are not repairable and must be replaced as an assembly. 3. Aerated transmission fluid. 3. Adjust transmission fluid to proper level (be sure dipstick calibration is correct for specific model); check for defective sealring at intake tube. Check for defective input charging pump. 4. Cooler flow loss due to internal leakage. 4. Overhaul transmission.