REPAIR INSTRUCTIONS

59.Install the rear case dowel bolts and nuts and tighten them to the specified torque.

60.Install the inner and outer (case-to-case) capscrews to secure the rear case to the main case. There are two inner capscrews located just inside the rear compound cover opening. Tighten the inner and outer case-to-case capscrews to the specified torque.

Setting Rear Countershaft Bearing Preload

61.Install the compound countershaft bearing covers. Determine the shim pack thickness for each rear countershaft bearing preload adjustment, using the procedure described in the example that follows.

62.Working at the rear of the countershafts, temporarily install the rear countershaft bearing covers, leaving the capscrews loose. Do not install shim packs or O-rings at this time. Measure the space between the bearing cover and transmission case, using two feeler gauge sets. Take at least two measurements and average the results.

A more accurate measurement can be obtained if the transmission is in a vertical position and each bearing cover is hand-held firmly against the countershaft rear bearings.

63.For each countershaft, remove the bearing cover and add enough shims to bring the space under the bearing cover to zero. Then remove enough shim thickness to obtain the required 0.002 to 0.006 inch preload.

Example: a.Begin the procedure using no shims or O-rings under the cover. b.Measure the space under the cover. For this example, the space is 0.100 inch. c.A 0.100-inch shim pack is needed to fill the measured space. d.Remove (subtract) 0.002 to 0.006 inch shims from the pack to obtain the specified preload. e.To obtain the required 0.002 to 0.006 inch preload, final shim pack thickness must be 0.094 to 0.098 inch for this example.

64.When all shim packs have been determined, install the rear compound countershaft bearing covers, shim packs, O-rings and cover capscrews. Then tighten the capscrews to the specified torque. Use new O-rings when installing the covers.

Preload is “negative end play” or “crush.” It cannot be measured directly. Determining shim thickness must be done carefully, as described, to obtain the correct preload on the bearings.

65.For the conventional output shaft transmissions: T313–T318(L)(LR), install a new gasket onto the rear mainshaft bearing cover. Note the location of the lubrication hole.

66.On the conventional output shaft transmissions: T313–T318(L)(LR), install the rear mainshaft bearing cover assembly to the rear case and secure with capscrews. Tighten the capscrews to the specified torque.