Specifications

300 SERIES MAN HOLE DIGGER
FORM GOM12070702, VERSION 1.2
42
Observe all applicable safety precautions
for the solvent.
5) Remove the self-locking nut, PN 19160001 and flat
washer, PN 17160000.
6) Using the gear puller, remove the secondary gear,
PN 345-0350 from the driveshaft. Remove the
Woodruff key, PN 15, and the Nilos ring, PN
08125/08231B-AV.
7) Using the shop press and suitable blocking, support
the driveshaft housing area of the transmission case to
prevent deformation damage.
Press the driveshaft out
of the transmission. The oil seal should also press out
at this time. FIGURE 32.
FIGURE 32
Wear safety glasses and other appropriate
saf e ty e qu ip me nt w he n p re ss i ng th e
driveshaft assembly. Caution all onlookers
about the possibility of flying debris and
the potential for personal injury.
8) Remove the bearing cone, PN 08125, from the shaft.
Inspect the driveshaft for chipping or cracking around
the Woodruff key area. If any damage is evident,
replace the driveshaft.
9) Inspect the area where the oil seal rotates about the
driveshaft for scratches, chips or other imperfections
which can cause oil to leak past the oil seal. Unless the
inner sealing member of the replacement oil seal turns
on a concentric, smooth surface, it also will continue to
leak oil. If the depth of the groove cut into the final
driveshaft
is greater than .010 inch (0.25 mm), the
driveshaft must be replaced.
10) Inspect the replacement oil seal for cuts or other
imperfections around the sealing members. Pack the
cavity between the inner and outer sealing members
with a Barium or Lithium based lubricating grease.
LUBRIPLATE 105 is an approved lubricant. This
precautionary measure minimizes the possibility of a
dry oil seal rotating on a dry shaft during the first few
minutes of operation. FIGURE 33.
FIGURE 33
11) Slide the oil seal over the circular spacer of the
driveshaft with a circular, twisting motion. The crimped
side of the oil seal, marked "NATIONAL 471820 USA"
faces away and opposite the threaded end of the
driveshaft. Use caution not to cut or nick the sealing
lips when installing the oil seal.
12) Clean and inspect both bearing cones. Replace if
excessive wear is evident. Repack both bearings with
a suitable wheel bearing grease. Reinstall the lower
bearing cone on the driveshaft against the spacer.
13) Clean and inspect the transmission oil seal housing
for damage. If the housing shows signs of "galling"
damage or elongation, coat the outside diameter of the
oil seal with a bearing locking grade of anaerobic
adhesive/sealant to help retain it in position.
14) Position the transmission case on the shop press
with the driveshaft housing face up. Determine that the
transmission case is not being supported by the
alignment dowel pins. Use Service Tool PN 345-7010,
to press the oil seal/driveshaft assembly into the
transmission until the oil seal is firmly seated against