REPAIR INSTRUCTIONS TRANSMISSION DISASSEMBLY PROCEDURES [320]
Unless a complete overhaul is necessary, remove only those parts required to gain access to faulty parts. Do not disturb parts with a heavy press fit (interference fit) unless replacement is necessary. When replacement is necessary, use proper press setups and pullers so that usable parts are not damaged.
Lift and move the transmission with a hoist, using the two lifting brackets provided. 2. Remove the clutch release bearing assembly, shafts, yoke and clutch brake (if equipped). 3. Disconnect the air lines attached to the range shift cylinder, rear case shift cover (splitter) and range shift valve. Air lines are installed using a push/pull-type fitting and are best removed using tool kit 9032-1800trk which can be obtained through the MACK Parts System. Disconnect the air lines using the following procedure:
External inspection of the unit before cleaning and disassembly often reveals information about existing operating conditions. This may help when diagnosing problems.
a.
Select the appropriate size release tool from kit 9032-1800trk.
b.
Insert the tool over the air line and release the lines from the fittings by pushing in toward the fitting and at the same time, pulling on the hose.
61
During disassembly, remember the sequence in which components and individual parts are removed from the transmission. It is good practice to keep related parts together in groups when removed. Small parts such as shims and spacers can be wired to the larger pieces they go with. Groups of parts can be kept together in boxes.
Keep parts such as shim packs, bearing cones, bearing retainers (covers), bearing cups and gears with the original countershaft from which they are removed. Mark each countershaft and bearing cover before removal. Mark the upper left front and rear countershafts and bearing covers (viewed from rear) as number 1. Mark the upper right front and rear countershafts and bearing covers (viewed from rear) as number 2. Mark the lower front and rear countershafts and bearing covers as number 3. 1. Clean the transmission externally and mount it in an overhaul stand. Drain the lubricant and plug any air line openings to prevent dirt from entering.
Page 50
Figure 61 — Removing Air Lines 1. Air Line Removal Tool 9032-1800trk
2. Air Hose Fitting Release Ferrule
4. Label the air lines for proper reassembly.
