| Tweet |
Custom Search
|
|
|
||
 TM 55-1905-217-34
(f) Loosen the drive flange retaining nut (17, fig. 3-81) in the same manner as outlined above, using wrench J 4384-01.
CAUTION
Do not attempt to loosen or tighten the driven gear or drive flange retaining nuts by
using a hammer with drift or chisel. Damage to the nuts will occur. Also, the proper
torque cannot be obtained when tightening the nuts in this manner.
(4) Remove drive shaft covers (26).
(5) Lift both power drive gears (28) with front bearings (2) and rear bearings (27) out forward face of
transfer gear housing. If bearing sticks in housing, use a wood block on outer race and drive from position.
(6) Remove the power driven gear locknut (8) and lock washer (5) from shaft; then, slide the driven gear
(23) straight forward from shaft. Remove spacer (13).
(7) Remove the drive flange retaining nut (17) and pull flange (19) from shaft.
(8) Remove the eight bolts and lock washers that secure the driven shaft bearing retainer (15) to the
transfer gear housing. Then, remove the bearing retainer and gasket.
(9) Support the transfer gear housing and driven shaft on wood blocks to maintain the shaft in a horizontal
position. With the transfer gear housing and driven shaft suitably supported, tap the forward end of the shaft with a plastic
hammer to free the shaft and bearing assembly. Then, remove the shaft and bearing assembly from the gear housing.
(10) Support shaft and bearing assembly in an arbor press, with forward face of bearing on split plates,
and press shaft from bearing.
(11) Use a press to remove bearings from drive gears (28).
d. Cleaning, Inspection and Repair.
(1) Wash all power transfer gear parts in solvent, (FED. SPEC. PD-680) and blow dry with compressed
air.
(2) Inspect bearing races, cups, and balls or rollers for indications of corrosion or pitting. Apply light
engine oil to bearings; then, while holding inner race from turning, revolve the outer race or cup slowly by hand to check for
free rolling of the balls or rollers on the races or cups. Rough spots in the bearings are sufficient cause for rejection.
(3) Examine teeth of drive and driven gears for wear, scoring or for a chipped or nicked condition. Gears
may show considerable wear and still be usable. If gears are worn excessively or chipped and nicked and cannot be
cleaned up, they must be replaced.
(4) Examine splines in gear hubs, drive flange and on shafts for wear and peening. If wear and peening is
excessive replace shafts, gears and drive flange.
(5) Examine threads on the drive and driven shaft for damage. If threads are severely damaged and
cannot be cleaned up, replace the shaft.
(6) Examine oil seals, and if lip of oil seal is nicked, rough, or charred so that a perfect seal will be
impossible, replace the oil seals.
(7) Remove all traces of old gaskets before installing the new gaskets.
e. Reassembly.
(1) Refer to figure 3-81 and reassemble the transfer gear in reverse order of disassembly.
(2) Use a press and split support plates to assemble bearings to gears and shaft. Use a thin coat of lubri-
plate on bearing race surfaces to facilitate assembly.
(3) Tighten driven gear locknut (8) to 250-300 ft-lb torque.
(4) Tighten drive flange retaining nut (17) to 450-750 ft-lb torque; then install cotter pins in diametrically
opposite pin holes.
f. Installation.
(1) Thread an eyebolt into tapped hole at each side of the transfer gear housing, then attach a chain hoist
and sling to the eyebolts.
(2) Affix a new gasket to the rear face of adapter plate.
(3) Lubricate the splines of both drive shafts, the driven shaft pilot bearing and the two drive gear bearings
with engine oil.
(4) With the blocking still in place beneath the two engine flywheel housings, same as when the transfer
gear assembly was removed, position the gear assembly directly in back of the adapter plate with the drive shafts in line
with the center of drive gears.
(5) Move the transfer gear assembly forward and pilot the drive shafts straight into the hubs of drive gears.
Continue to move the assembly forward and engage the splines of drive shafts with splines in hub of drive gears.
NOTE
If the splines on the drive shafts do not readily engage those in the gear hubs, press
forward on the gear assembly and, at the same time, turn the driven shaft drive flange
slightly to aline to the splines. If one drive shaft enters and the other does not, bar the
engine of the non-engaging gear over by hand until the shaft enters the splines in gear
hub.
(6) With the drive shafts entered into the hubs of drive gears, continue to push the assembly forward and
enter the driven shaft pilot bearing and the drive gear bearings straight into
3-114
|
||
|
||
