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Metal. Metal particles in the fluid (except for the minute particles normally trapped
in the oil filter) indicate internal transmission damage. If these particles are found in
the sump, the transmission must be disassembled and closely inspected to find their
source. Metal contamination requires complete transmission disassembly. Clean all
internal and external hydraulic circuits, cooler, and all other areas where the
particles could lodge.
CAUTION: After flushing the cooler, be sure to check the external
cooler circuit restriction. If circuit pressure drop is above
specification, the cooler has excessive trapped particles and must be
replaced.
TRANSMISSION FLUID AND FILTER CHANGE PROCEDURE
NOTE: Do not drain the transmission fluid if only filters are being
replaced.
Drain Fluid.
• Drain the fluid when the transmission is at operating temperature —
71˚C–93˚C (160˚F–200˚F). Hot fluid flows quicker and drains more
completely.
• Remove the drain plug from the control module and allow the fluid to drain
into a suitable container.
• Examine the fluid as described in TRANSMISSION FLUID
CONTAMINATION section.
Replace Filters. See following figure.
• MD 3060s prior to S/N 6510069120 and HD 4060s prior to
S/N 6610009730
— Remove twelve bolts 1, two filter covers 2, two o-rings 4, two square cut
seals 5, and two filters 6 from the bottom of the control module.
— When reinstalling parts, lubricate and install an o-ring 4 on each cover 2.
Install a square cut seal 5 on each cover 2. Lubricate filter o-ring (inside
filter) and install filters 6 onto covers 2.
• Continue the procedure beginning at the CAUTION on the next page.
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Do you have a question about the 3000 MH Series and is the answer not in the manual?
Questions and answers
Trans comm Failure TCM good replace 2 months ago What else could this be?
A transmission failure in an Allison Transmission 3000 MH Series after a TCM replacement could be caused by the following:
1. TCM/ECM Mismatch (DTC P0614): If the engine and transmission controllers are not properly matched or configured, it can lead to communication errors and improper torque control. The engine software may need updating to be compatible with the transmission.
2. Improper Calibration (DTC P0613): If the TCM was not calibrated to match the vehicle’s transmission configuration, it may cause operational issues.
3. Wiring or Connector Issues: Faulty or loose data link connectors or damaged wiring between the TCM and other components can disrupt communication.
4. High TCM Temperature (DTC P0634): If the TCM is exposed to high heat (e.g., near exhaust lines), it can malfunction.
5. Missing Throttle Input (DTC P063E): If the automatic configuration throttle input is not present due to communication or wiring issues, transmission performance may be affected.
6. Filter Maintenance Alert (DTC P088A): Clogged transmission filters can cause pressure drops, triggering alerts and potentially affecting transmission function if not addressed.
Each of these issues could contribute to transmission failure if not resolved after the TCM replacement.
This answer is automatically generated