Allison marine gearbox manual

As always, be sure to consult with an experienced mechanic if you need more advanced help. During the overhaul, discard any gaskets and replace with new ones. If any washers, rings or similar are warped or damaged, be sure to replace them as well.

Also, be advised that some seals should not be burned due to the risk of toxic gasses being released. In general, be sure to maintain a clean area, and due to the small amount of clearance between parts, be sure to handle all interior parts carefully so they are not bent or nicked. If you need to clean the interior of the unit, be sure to use mineral spirits.

Compressed air can be used to dry, but be sure it is not used on the bearings. Check bores and passages for obstruction. Check mounting faces for scratches and foreign matter. Remove with a crocus cloth. Step One: Secure a sling that can hold one-quarter of a ton, roughly lbs.

Bolts can be removed from the bearing retainer to attach a sling to it. Step Two: Remove the oil gauge rod, if attached This will be on the lower right side when facing the nameplate.

Step Three: Remove the breather located directly in front of the name plate. Step Four: If there is a selector valve, take out the four screws that hold it in place and remove the entire assembly. Step Five: When looking at the gears, remove the input shaft snap ring, which is at the center of the shaft. Step Six: The smallest gear, the reverse sun gear, can be removed along with the nearest washers, which include the internal-splined washer and two brass thrust washers.

Step Seven: The reverse planetary assembly can then be removed, along with the washer behind it. This is a slightly larger gear, which fits around the smaller sun gear. Step Eight: Locate the three split pins and gently drive them in with a hammer until they are flush with the backplate. These pins will be located at the top, bottom left and bottom right side of the plate. Step Nine: If you have the compressor tool, use it here.

Otherwise, compress the backplate to relieve the pressure on the snap ring the ring that goes along the outside of the backplate. Step Ten: Install lifting bolts into the reverse back plate.

As it is removed, sixteen springs and three lock pins will fall free. Remove these, along with the three split pins. Step Eleven: After the reverse clutch plate and ring assembly are removed, the reverse piston the larger gear located behind them can be removed in the same way, such as using lifting bolts.

Step Twelve: Remove the seal ring and expander from the piston and housing. Step Thirteen: Put the transmission on wooden blocks so that the front facing down. Step Fourteen: Remove the twelve bolts and lockwashers from the oil pan to remove it, along with its gasket. Step Fifteen: Remove the three bots and lock washer on the oil baffle, a cylindrical piece located in the front spanner unit.

Step Sixteen: Remove the cotter pin from the output flange nut, which is the pin in the center of the front. Step Eighteen: Use chains, or something similar, to make sure the parts of the transmission do not rotate.

Step Nineteen: With the motion of the transmission secured, use a spanner wrench to remove the output flange nut. Step Twenty: Remove the output flange, a plate with 6 holes in it on the top of the unit. Step Twenty-One: Use an impact wrench to loosen the stalking on the front spanner nut.

Even if it does not loosen, go ahead and remove the ten bolts and lock washers from the bearing retainer. Step Twenty-Two: Attempt to remove the front spanner nut. This can be done with a wrench and torque multiplier. If it is too difficult, this piece can be removed with a rotary file, but be sure to not harm the output shaft, and to clean up all filed materials.

Step Twenty-Three: Reinstall the flange and output nut. Install threaded rods and jam nuts. Hold the nuts and turn the jam nuts to raise the shaft, and loosen the front spanner nut. Turn them a little further to remove the front spacer nut.

Step Twenty-Four: Remove the reduction gear from the housing, followed by the inner race, rollers and outer race. The shims can also be removed. Step Twenty-Five: Finish removing the pinion gear and bearings as an assembly as well as any shims and spacers. Finally, remove the input shaft. Allison Marine MH Overhaul.

Listed here is the information for taking apart an Allison MH transmission to perform overhaul work. For the MH, follow steps on the M section, because it is very similar. The rest of the process is outlined here:. Step Fourteen: Once the transmission is on its side, remove the twelve bolts and lock washers from the oil pan to remove it. Step Fifteen: Locate the oil baffle and remove the three bolts holding it in place.

Step Sixteen: Use the oil port in the front of the housing to access the front spanner nut, and destake it by using a hammer to gently tap it. Step Eighteen: Use a spanner wrench to prevent the front spanner nut from moving. Use a torque multiplier and spanner wrench to force the output shaft out.

Step Nineteen: Next de-stake the rear output nut, by placing a shop towel or something similar in the gear teeth to prevent rotation. Step Twenty: Remove the 9 bolts and washers from the rear bearing retainer. Use jacking bolts to remove the bearing retainer. Step Twenty Two: Remove the six bolts and washers from the lower bearing retainer, and remove them, with the gasket. Step Twenty Three: Place the output flange and nut back on the unit.

Use wood blocks to protect the reduction gear. Install all thread rods with nuts, and use them to raise the output flange. Remove the front roller bearing. Bearing Maintenance and Repair The bearings are an integral part of the Allison transmission. Here are some key points to ensure that they last with extended use. If they are filled with hardened grease, soak them in mineral spirits. These include scored, scratched or otherwise damaged rollers or balls.

If you see any in the bearings, be sure to clean them thoroughly. Tighten all loose bolts to recommended torque specifications. Green Paint for Detroit Diesel Engines. AT Series microphone system pdf manual download.

Meritor Transmission Manuals. Download PDF. Meritor 9 10 13 Speed Transmissions PB Work boats require transmission oil changes every 1, hours. Allison Transmission is an American manufacturer of commercial duty automatic transmissions and hybrid propulsion systems. Allison transmission manual of the cl b t , cl b t db size 9. Some of these service operations require the use of tools specially designed for the purpose. The chart will give you confidence when speaking with your Allison marine transmission mechanic or ordering parts.

Drive shaft rotates with selector valve in neutral after shifting from forward to neutral. Drive shaft rotates with selector valve in neutral after shifting from reverse to neutral. Refer a Friend. Refer Us To A Friend. No power is transmitted when selector is in forward position. Worn forward clutch facings Replace clutch plate. Damaged forward clutch plate Replace clutch plate. Improper dump valve operation Clear dump valve thoroughly and replace damaged parts.

Low oil pressure Refer to D, E, or F. No power is transmitted when selector is in reverse position. Worn reverse clutch facings. Replace clutch plate. Damaged reverse clutch plate. No power is transmitted regardless of selector position. Manual selector valve not positioned properly. Check linkage. Low oil pressure regardless of selector position. Low oil level Restore oil level. Improper operation of oil gage Replace oil gage or, if the oil gage is slow to register, bleed the oil gage line to remove entrapped air or obstruction.

Improper oil viscosity Check the oil temperature and if found to be abnormally high, remove the transmission oil cooler and clean internally and externally. Replace the cooler if necessary. Improper pump adjustment Shirn the pump. Refer to engine service manual.