PN-52886 (4/97)22
Remove input shaft (3) with bearing (8) from front
cover (6). Remove bearing (8) from input shaft (3).
Remove input bearing (9) by using a punch and
hammer from outside the housing.
Remove the input oil seal (20) by using a punch and
hammer from outside the housing.
Support housing in vise in horizontal position.
Remove snap ring (16) on vertical housing using two
screwdrivers.
Stand gearbox vertically to remove shield washer (7).
Support housing in vise in horizontal position.
Remove dual lip seal (19) by driving screwdriver in the
middle of oil seal and extract by prying on the housing
shoulder.
Remove the internal retaining ring (15) using snap
ring pliers.
Support housing in vise in vertical position.
Remove oil vent plug (25). Remove vertical shaft (4),
bearings (10) and bearing spacer (5) assembly by
using a punch and hammer to tap vertical shaft (4)
through the oil vent plug hole.
Remove snap ring (14) from vertical shaft (4) using
snap ring pliers.
Remove the bearings (10) and bearing spacer (5)
from the vertical shaft (4).
Inspect gears for broken teeth and wear. Some wear
is normal and will show on loaded side. Forged gear
surfaces are rough when new. Check that wear
pattern is smooth.
Inspect vertical and horizontal shafts for grooves,
nicks, or bumps in the areas where the seals seat.
Resurface any damage with emery cloth.
Inspect housing and caps for cracks or other damage.
Gearbox Assembly
(Figure 18)
Repair to this gearbox is limited to replacing bearings,
seals and gaskets. Replacing gears, shafts and a
housing is not cost effective. It is more economical to
purchase a complete gearbox if repairs other than
replacing bearings, seals or gaskets are required.
Clean housing, paying specific attention to areas
where gaskets will be installed.
Wash housing and all components thoroughly. Select
a clean area to do assembly. Replace all seals,
bearings, and gaskets. All parts must be clean and
lightly oiled before reassembling.
Insert input bearing (9) in the housing using a round
tube of correct diameter using a hand press.
Press gear (1) on input shaft (3) making sure
rectangular key (13) is aligned.
Press input shaft assembly (1, 3, 13) into input
bearing (9).
Secure O-ring (21) with grease in the housing.
Press front bearing (8) in the front cover (6).
Press front cover assembly (6, 8) on input shaft (3).
Install snap ring (17) into housing. Verify that snap
ring (17) is seated correctly by measuring its internal
diameter in two positions. Dimensions should be
4.70” or greater.
Check input shaft end float by moving the input shaft
(3) by hand. If end float is higher than 0.012,” insert
shim between input shaft (3) and rear bearing (8).
Repeat until end float is less than 0.012”. Check
rotational torque by hand. The torque should be less
than 2.2 lbs.-inch.
Install the following parts on the vertical shaft (4):
bearing (10) and snap ring (14). Check end float, if it
is greater than 0.012”, install shim (22a) between
bearing (10) and snap ring (14). Check that the
vertical shaft rotates freely. The torque should be less
than 2.2 lbs.-inch.
Press the vertical shaft assembly (4, 10, 14), spacer
(5), and bearing (10) into the housing (2). Install the
snap ring (15) and make sure it fits securely.
Check that the gear backlash is between 0.006” to
0.016”. You should not have to adjust the backlash.
Apply grease to lower seal lips (19) and insert in
vertical housing using tube of correct diameter, paying
attention not to damage the seal lip. Press in housing
so seal is recessed 0.275 to 0.314 inch. Insert
protective washer (7) by hand. Install snap ring (16)
and position it together with dual lip seal (19) by
pressing it into position.
Press input shaft oil seal (20) in, using tube of correct
diameter. Be careful not to damage seal lip.
Apply Permatex to horizontal shaft back bore and
insert cap (25).
Check gearbox housing for leaks by plugging all holes
except one. Apply 4 PSI compressed air and immerse
the gearbox in water to verify there are no leaks.
Remove gearbox from water and dry off with
compressed air. Add 0.85 quart (800 ml) SAE 80W or
90W EP oil and tighten all plugs.
(Rev. 2/9/99)
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