Eskridge, Inc. Olathe, Ks. 913-782-1238 www.eskridgeinc.
com
Model 312 spindle-shaft service manual, SM312S2
-AA
Page 4
Unit Teardown
1)
Scribe a 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
(
30A &/or 30B
)
and drain oil from unit. The
oil will drain out more quickly and completely if warm.
3) Remove the twenty
5/8-11
capscrews
(
25A
)
and
lockwashers
(
25G
)
.
4)
Remove the cover
(
3
)
, thrust washers
(
14A & 14B
)
, and in-
put gear
(
4
)
. Inspect o-ring
(
16B
)
; discard if damaged or
deformed.
5)
Lift the planet carrier assembly
(7)
out of the unit and lift the
primary ring gear
(12A)
off the unit. Inspect the o-ring
(16B)
.
discard if damaged or deformed.
6)
Lift the secondary ring gear
(12B)
off the unit. Inspect the
o-ring
(16B)
and discard if damaged or deformed.
7)
Lift the secondary carrier assembly
(5)
from the splines of the
output shaft
(2)
.
8) The unit is now disassembled into groups of parts.
The area(s) requiring repair should be identified by thorough
inspection of the individual components after they have been
cleaned and dried.
Carrier Assembly Teardown
Rotate planet gears (
7B pri/5B sec
) to check for abnormal
noise or roughness in bearings (
7D pri/5D sec
). If further in-
spection or replacement is required, proceed as follows.
1)
Drive roll pins
(
7F pri/5F sec
)
completely into the planet shafts
(
7C pri/5C sec
)
.
2)
Slide planet shafts
(
7C pri/5C sec
)
out of carrier
(
7A pri/5A
sec
)
.
3) Remove
planet
gears
(
7B pri/5B sec
)
, washers
(
7E pri/5E
sec
),
spacers
(7G pri/5F sec)
and bearings
(
7D pri/5D sec
)
from carrier
(
7A pri/5A sec
)
.
4)
Inspect the planet gear
(7B pri/5B sec),
bearing bore and plan-
et shaft
(7C pri/5C sec)
and bearing rollers
(7D pri/5D sec)
.
Check for spalling, bruising or other damage and replace com-
ponents as necessary.
Note: When using loose (uncaged indi-
vidual) rollers, all rollers in the planet gear must be replaced if
any are found to be defective (and likely the planet shaft and
planet gear as well).
5)
Remove roll pins
(7F pri/5F sec)
from planet shafts
(7C)
using
a 3/16 sec inch pin punch.
Carrier Reassembly
1)
Loose roller installation:
a)
Set planet washer
(7E pri/5E sec)
on work table with
planet gear
(7B pri/5B sec)
on top of it. Center planet
washer to planet gear as closely as possible
.
b)
Center planet shaft
(7C pri/5C sec)
in planet gear
(7B
pri/5B sec)
bearing bore
.
c) If used, pla
ce spacer washer
(7F pri/ 5F sec)
onto
planet shaft (refer to exploded view to confirm spacer
positions)
.
d)
Begin placing rollers
(7D pri/5D sec)
around shaft
(7C pri/5C sec)
. There should be clearance for last
roller to slide in. Be sure to install 12 (pri) or 2 rows of
18 (sec) rollers in each planet gear
(7B pri/5B sec)
on loose roller applications.
(If using multiple rows of rollers, repeat steps C and D
as necessary. Once complete, refer to exploded view
to
confirm that any spacer washers
(7F pri/ 5F sec)
are appropriately placed.)
e) Pla
ce a washer
(7E pri/5E sec)
over gear
(7B pri/5B
sec)
and onto shaft
(7C pri/5C sec
)
.
f)
Carefully slide assembly off of table, holding planet
washers
(7E pri/5E sec)
against planet gear
(7B
pri/5B sec)
.
g) Slide planet shaft
(
7C pri/5C sec)
out o
f the assem-
bly and slide assembly into carrier.
h) Align planet gear & bearing assembly inside
carrier and install planet shaft through entire
assembly. Use grease to hold the rollers if neces-
sary.
2) P
lanet shafts
(7C pri/5C sec)
should be installed with cham-
fered end of 3/16 roll pin hole towards outside diameter of
carrier
(7A pri/5A sec)
; this will ease alignment of holes
while inserting roll pins
(7F pri/5F sec
)
.
3) Drive
roll
pin
(
7F pri/5F sec)
into the carrier hole and into
planet shaft to retain parts. Repeat for remaining planet
gears.
Base Subassembly Teardown
1) Remove the lock ri
ng
(35C)
using a heel bar or puller; if
using a heel bar, be sure
not
to pry against the cage of
the inner output shaft bearing
(20C)
. Remove the split ring
segments
(35B)
and shims
(35A
)
.
Caution: Since the shaft is no longer positively re-
tained, care should be taken to avoid personal inju-
ry. Care should also be taken not to damage it while
pressing through base.
Note: Removing the shaft from the base assembly damages
the shaft seal, if equipped with lip-seal (16A) and the seal
will need to be replaced. If equipped with metal-face-type
seal (16D) (also known as Cat-seal), the seal components
may not be damaged by removal and may be re-usable.
2) Place
base
(1)
external side down, on a plate or table (with
a hole large enough for the spindle shaft to pass through
or set the base on sturdy steel or square-steel tubing.
Press output shaft
(2)
out bottom of base
(1)
by applying a
load to internal end of shaft
(2)
until it passes through inner
shaft bearing cone
(20C
)
.
3)
A gear puller may be used to remove the outer bearing
con
e
(20A)
from the shaft
(2)
. If reusing old bearing cone,
do not pull on or damage roller cage. Remove the shaft
seal
(16A)
and replace
. If equipped with metal-face-type
seal
(16D)
, inspect the rubber rings of the seal
(16D)
and
the metal face pieces of
(16D)
and clean or replace, as
necessary. Remove the option boot
(16C)
if equipped.
