The Eaton 2A-92 model is a two-speed auxilliary transmission, designed primarily for use with heavy-duty transmissions. This transmission contains two sets of gears, thus giving the reduction (low) ratio when power is delivered through the two sets of gears. The other speed is obtained by direct (high) drive through the auxiliary.
A single shift bar in the right side of the case controls the speed changes. When the shift bar is moved 7/8" forward from neutral, the mainshaft sliding gear locks the mainshaft to the drive gear and shaft, thus delivering power directly through the transmission. When the shift bar is moved 7/8" to the rear from neutral, the sliding clutch locks the mainshaft bushed gear to the mainshaft, thus transferring power through the two sets of gears to obtain the reduction ratio.
The 2-A-92 has a solid countershaft with an integral low speed gear and a press-fit drive gear.
Transmission Operating Angles
If the transmission operating angle is more than 12 degrees, improper lubrication will occur. The operating angle is the transmission mounting angle in the chassis plus the percent of upgrade (expressed in degrees). For operating angles over 12 degrees, the transmission must be equipped with an oil pump or cooler kit to insure proper lubrication.
Specification Information
Gear Ratios 2-A-92
Direct 1.00
Low (Reduction) 2.30
Mountings
Front - One vertical stud in front bearing housing. An optional mounting consists of a nose piece machined for trunnion mounting. Rear - Four 5/8" studs with nuts and lockwashers in rear face of case.
Control
Single shifting bar in right side of case. Forward position of shifting bar shifts transmission into direct drive, rear position shifts transmission into the reduction gear. A shift lever can be mounted on an extended brake shaft on the main transmission to operate a control rod to the auxiliary transmission shifting bar.
Speedometer Drive
Provision is made in the rear bearing cover for the installation of a speedometer gear and the attachment of a cable. An electronic sensor may also be installed by adding the correct cover and rotor.