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Allison Transmission Parts

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

C - ABNORMAL STALL CHECK SPEEDS
Condition Probable Causes Suggested Remedies
High Stall Speeds 1. Transmission fluid level low. 1. Add transmission fluid to proper level. (Be sure dipstick calibration is correct for specific model.)
2. Clutch pressure low.* 2. Refer to Chart E, Low Pressures.
3. Forward clutch slipping (forward)*. 3. Rebuild forward clutch.
4. First clutch slipping*. 4. Rebuild first clutch.
5. Fourth clutch (third clutch in V730) slipping (reverse). 5. Rebuild fourth clutch (or third clutch in V 730).
6. Low clutch slipping (5 speed)*. 6. Rebuild low clutch.
Low Stall Speeds 7. Engine not performing efficiently (may be due to plugged or restricted fuel injectors or high altitude conditions). 7. Refer to engine manufacturer's manual or vehicle service manual.
8. Broken converter parts. 8. Replace or rebuild converter assembly. Note: Welded converter assemblies are not repairable and must be replaced as an assembly.
Stall Speed 50% of Normal 9. Freewheeling stator. 9. Replace or rebuild converter assembly. Note: Welded converter assemblies are not repairable and must be replaced as an assembly.
* Slipping clutch may be recognized by alternate racing and loading of the engine which is, at times, accompanied by violent chatter. Refer to Slipping Charts F, M, N, O, P, and Q.