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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

G - EXCESSIVE ENGINE FLARE Condition Probable Causes Suggested Remedies Excessive Engine Flare 1. Trimmer valve sticking. 1. Replace or rebuild control valve body assembly. Inspect trimmer valves and confirm correct springs. 2. Trimmer valves and/or trimmer valve springs incorrect or weak. 2. Confirm correct trimmer valves and trimmer valve springs. 3. Selected range clutch defective. 3. Overhaul transmission. 4. Hook-type sealring broken. 4. Replace sealrings. 5. Shift points too low. 5. Check trimmer valves and confirm correct trimmer valve springs. 6. Forward clutch piston seals leaking or clutch plates slipping (all upshifts). 6. Overhaul forward clutch and piston assembly. 7. Governor valve sticking. 7. Clean or replace governor screen and/ or governor.