Model 28L Service Manual, SM28LM-AA Page 4
Eskridge, Inc. Olathe, Ks. 913-782-1238 www.eskridgeinc.
com
Unit Disassembly Procedure
All number references refer to the exploded drawing on Page 2.
1) Scribe a diagonal line across the outside of the unit from the
cover
(3)
to the base
(1)
before disassembly to aid in the
proper positioning of pieces during reassembly.
2) Remove drain plugs
(30)
and drain oil from unit. The oil will
drain faster and more completely if warm. Tilt the unit so that
the drain port in the base
(1)
points downward to drain as
much oil as possible.
3) Remove the six hex-head capscrews
(25A)
and lock washers
(25G)
.
4) Remove cover
(3)
, and inspect o-ring
(16C)
. Discard o-ring if
damaged or deformed.
5)
Remove the lock ring
(35C)
using a heel bar or puller. Be
careful not to pry against the bearing cage
(20A)
. Remove
split ring segments
(35B)
and shims
(35A)
.
Caution: Since the output shaft is no longer retained, care
should be taken to avoid personal injury. Care should also be
taken not to damage the shaft while pressing through base.
6) Base
(1)
should be set spindle side down, as shown, on a
plate or table. Press output shaft through the bottom of base
by applying a load to top end (internal end) of shaft until it
passes through inner shaft bearing cone
(20A)
. Shaft seal
(16A)
will also be pressed out and will likely be damaged.
7) A gear puller or bearing splitter may be used to remove the
outer bearing cone
(20A)
from the shaft
(2)
. If reusing old
bearing cone, do not pull on or damage roller cage. Remove
the shaft seal
(16A)
and v-ring seal
(16B)
for inspection or
replacement.
8) Inspect inner and outer bearing cups
(20B)
. If cups are dam-
aged, drive them out using a brass drift or remove with a pull-
er.
Unit Assembly Procedure
1) Clean all foreign material from oil plugs
(30)
.
2)
Place base
(1)
(output side up, opposite shown) on the table.
3)
Apply a layer of lithium or general purpose bearing grease to
the roller contact surface of outer bearing cup
(20B)
.
4) Lubricate inner lip of v-ring seal
(16B)
and fit onto the shaft
(2)
seal diameter and against the shoulder.
5) Lubricate inner lip of shaft seal
(16A)
and slide it onto the
shaft
(2)
until it fits snugly over the shaft seal diameter with
the open side of the seal toward the inside of the unit.
6) Press outer bearing cone
(20A)
(large end down as shown)
onto the shaft until it seats against the shoulder.
Note: Press bearing cone onto output shaft by pressing on
inner race only. DO NOT press on roller cage, as it may dam-
age bearing.
7) Place the shaft
(2)
with the bearing
(20A)
, shaft seal
(16A)
,
and v-ring seal
(16B)
into the base
(1)
.
8) Flip this assembly, resting it on the end of the output shaft
(2)
.
9) Place thin shims (1/8 to 3/16 inch thick) between shaft seal
(16A)
and face of spindle
(2)
. Being careful not to damage
v-ring seal
(16B)
, press lightly on base
(1)
until shaft seal is
flush with base. Remove shims.
10) Apply a layer of lithium or general purpose bearing grease
to the roller contact surface of the inner cup
(20B)
. Press the
inner bearing cone
(20A)
(large end up as shown) onto the
shaft
(2)
until it is seated against inner bearing cup
(20B)
.
11) Bearing preload may result in a rolling torque that varies be-
tween 35 to 65 in-lbs. The bearing preload should be tailored
to your application; a low-speed application may require a
high pre-load, high-speed applications usually benefit from
low pre-load. Adding shims
(35A)
will increase the pre-load
on the bearing set. Determine your pre-load requirement
and install shims to obtain this pre-load. Install the Load-N-
Lock segments
(35B)
over the shims and into the groove
in the output shaft. With the Load-N-Lock segments firmly
installed place lock ring
(35C)
over the segments.
12) Lubricate o-ring
(16C)
and install in the pilot of the
cover
(3)
. Noting the scribed line made during disassembly,
install the cover.
13) Install the six hex-head cap-screws
(25A)
with lockwashers
(25G)
.
Torque the cap-screws to 25 ft-lb dry or 18 ft-lb if
the fasteners are lubricated
.
14) Ensure the unit spins freely by using a splined shaft to drive
the shaft
(2)
.
15) Fill the unit with GL5 EP 80/90 gear oil to the proper level,
as specified, using the oil fill hole in the cover
(3)
.
The unit is now ready to use.
