Eskridge 312 User manual

THIS SERVICE MANUALIS EFFECTIVE:
S/N: 147497 TO CURRENT
DATE: 1/8/2014 TO CURRENT
VERSION: SM312S2-AA
!
WARNING: While working on this equipment, use safe lifting procedures,
wear adequate clothing and wear hearing, eye and respiratory protection.
NOTE: Individual customer specifications (mounting
case, output shaft, brake assembly, etc.) may vary from
exploded drawing and standard part numbers shown.
If applicable, refer to customer drawing for details.
MODEL 312 SPINDLE-SHAFT
PLANETARY GEAR DRIVE
SERVICE MANUAL

Eskridge, Inc. Olathe, Ks. 913-782-1238 www.eskridgeinc.com
Model 312 spindle-shaft service manual, SM312S2-AA
Page 1
30A
3
16B
14A
25A
25G
4
14B
7C
7E
7G
7D
7G
7B
7F
7A
12A
14B
16B
6
5C 5E
5D
5G
5B
5E
5F
5A
12B
16B
35C
35B
35A
20C
20D
1
30B
30C
20B
20A
16A
2
7E
16C
16D
16E
16F
CAT-SEAL
LIP-SEAL
COMPONENT
COMPONENTS

Eskridge, Inc. Olathe, Ks. 913-782-1238 www.eskridgeinc.com
Model 312 spindle-shaft service manual, SM312S2-AA
Page 2
X312S2-AA, Page 2 of 2 Effective date 1/8/2014 Effective serial # 147497
PLANET GEAR - SECONDARY
THRUST WASHER - CARRIER
BEARING CONE - OUTER
BEARING CUP - OUTER
BEARING CONE - INNER
BEARING CUP - INNER
ROLL PIN (3/16 X 1)
ROLL PIN (3/16 X 1 1/4)
LOCKWASHER - (5/8)
DESCRIPTION
12A
12B
5A
5B
6
4
5C
5E
5D
5G
5F
1
1
1
1
4
1
3
1
4
3
2
3
6
8
1
1
1
1
4
12
1
20
3
4
20
1
1
1
RING GEAR - PRIMARY
RING GEAR - SECONDARY
CARRIER - PRIMARY
CARRIER - SECONDARY
SUN GEAR - SECONDARY
PLANET GEAR - PRIMARY
PLANET SHAFT - SECONDARY
PLANET SHAFT - PRIMARY
SEAL (O-RING)
ROLLER - 2 ROWS, 18 EACH ROW
SPACER - SEC PLANET BEARING
HEX HEAD CAPSCREW (5/8-11 X 7) GR 8
SHAFT SEAL
PLUG - COVER
PIPE PLUG (1/2 NPT MAGNETIC) - BASE
SPACER - PRI PLANET BEARING
SHIM - SHAFT ADJUSTMENT
THRUST WASHER - INPUT GEAR
LOCK RING - LOAD-N-LOCK
25-004-1562
25-004-1612
25-004-1432
25-004-1442
25-004-1132
01-402-0020
13-004-1582
25-004-1462
25-004-1182
01-102-0240
01-103-0240
01-102-0250
01-103-0250
01-106-0010
25-004-1452
13-004-1592
25-004-1051
25-004-1192
01-150-1630
01-153-0020
01-153-0190
01-166-0040
01-207-0041
01-208-0030
01-405-0670
01-207-0020
25-004-1752
SPLIT RING- LOAD-N-LOCK
11
25-004-3206
25-004-3207
252F BASE - FLANGELESS (LIP SEAL)
252A BASE - ROUND (LIP SEAL)
CUSTOM BASE
31 25-004-1222
C - SAE 'C' (2 AND 4 BOLT)
25-005-2051
25-005-2061
25-004-1232
A - SAE ' A' COVER
B - SAE 'B' COVER
D - SAE 'D' COVER
21 25-004-4052L
S1 - OUTPUT SHAFT - SPINDLE
25-004-1692
25-004-1602
25-004-1632
25-004-1622
25-004-1712
25-004-1732
25-004-1762
INPUT GEAR - 14T-12/24 SPLINE
INPUT GEAR - 13T-8/16 SPLINE
THRUST WASHER - PRI. PLANET
THRUST WASHER - SEC. PLANET
RATIO
I
T
E
M
Q
T
Y
GREASE FITTING (OPTIONAL) 01-215-0040
PLUG 1/4 NPT
PART NUMBER
20.25:1
4.3125:1
4.6957:1
26.34:1
5.609:1
4.6957:1
29.58
6.3:1
4.6957:1
40.24:1
8.57:1
4.6957:1
*
QU
ANTITY
O
F
S
HIM
S
DETERMINED BY BEARIN
G
PREL
O
AD.
MODEL 312L
EFFECTIVE:
FROM: S/N 110310 03/16/13
TO: CURRENT
X312LS2-Aa ECN: - DATE: 9-25-20 MTK
25-004-3204
252F BASE - FLANGELESS W/CAT SEAL
EQUIPPED WITH
"LOAD-N-LOCK" SHAFT
RETENTION SYSTEM.
25-004-1642 25-004-1702 25-004-1412
25-004-1652
25-004-1792
25-004-1802
25-004-1722
25-004-1742
25-004-1772
25-004-1552
25-004-1812
25-004-1782
144
5CARRIER ASSY - SECONDARY 25-005-2161
7CARRIER ASSY - PRIMARY
7A
25-005-2201 25-005-2181 25-005-2211 25-005-2171
7B
7C
ROLLER - 12 ROLLERS/PLANET 01-106-0010
36
7D
7E
7F
7G
14
14A
THRUST WASHERS AND THRUST BRGS ----------------
14B
16 SEAL KIT (INCLUDES ITEMS 16A, 16B) 25-016-2011
(1)
16A
16B
---
20 OUTPUT SHAFT BEARINGS ---------------- ---
20A
20B
20C
20D
25
25A
25G
----------------
HARDWARE
---
30
30A
30B
----------------
PLUGS
---
30C
*
1
35
35A
35B
----------------
MISCELANEOUS
---
35C
1
1
----------------
1RUBBER DIRT BOOT (OPTIONAL) 01-406-0102
16C
1METAL FACE SEAL (CAT SEAL) 01-406-0103
16D
1SEAL (O-RING) INTO CAT-SEAL ADAPTER 01-402-1020
16E
1ADAPTER - CAT SEAL 25-004-1858
16F REQ'D FOR CAT SEAL
REQ'D FOR CAT SEAL
REQ'D FOR CAT SEAL
NOT USED WITH CAT SEAL
REQ'D FOR CAT SEAL
25-004-3208
252A BASE - ROUND - W/CAT SEAL REQ'D FOR CAT SEAL
SPINDLE OUTPUT

Eskridge, Inc. Olathe, Ks. 913-782-1238 www.eskridgeinc.com
Model 312 spindle-shaft service manual, SM312S2-AA
Page 3
LUBRICATION & MAINTENANCE
Operating Position Oil Capacity
Double stage
Oil Level
Horizontal Shaft 3.38 qts / 3.2 l To horizontal centerline of
gear drive
Vertical Shaft (Pinion Up) 6.38 qts / 6.03 l To side port on gear drive
base
Vertical Shaft (Pinion Down) 6.38 qts / 6.03 l To midway on upper/
primary gear set
Using the chart below, determine an appropriate lubricant viscosity. Use only EP (extreme pressure) or API GL-5 designated lubricants.
Change the lubricant after the first 50 hours of operation and at 500 hour intervals thereafter. The gear drive should be partially disas-
sembled to inspect gears and bearings at 1000 hour intervals.
80W90 conventional
75W90 conventional
85W140 conventional
75W90 synthetic
80W140 synthetic
Note: Ambient temperature is the air temperature measured in the immediate vicintiy of the gearbox. A Gearbox exposed to the direct rays of
the sun or other radiant heat sources will operate at higher temperatures and therefore must be given special consideration. The max operating
temp must not be exceeded under any circumstances, regardless of ambient temperature.
If your unit was specified “shaft up” or with a “-Z” option, a grease zerk was provided in the base housing. For shaft-up operation, the
output bearing will not run in oil and must be grease lubricated. Use a lithium based or general purpose bearing grease sparingly every
50 operating hours or at regular maintenance intervals. Over-greasing the output bearing should be avoided as it tends to fill the housing
with grease and thicken the oil
Recommended ambient and operating temperatures for conventional and synthetic gear lubricants
-50 -25 0 25 50 75 100 125 150 175 200 225 250 F
-45 -32 -18 -4 10 24 38 52 66 79 93 107 121 C
Min Ambient/operating temp Max Operating temp
Max Ambient temp
ESKRIDGE MODEL 312 OIL CAPACITIES
ESKRIDGE PART NUMBER INTERPRETATION
Note: All non custom Eskridge Geardrives are issued a descriptive part number which includes information regard-
ing the Model, means of shaft retention, base style, shaft style, input mounting, input shaft size, overall ratio and
various available options. For a detailed breakdown of this information, please refer to Eskridge product specifica-
tion sheets found at: http://www.eskridgeinc.com/geardrives/gearprodspecs.html

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, place 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) Place 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 of 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) Planet 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 ring (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
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 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.

Eskridge, Inc. Olathe, Ks. 913-782-1238 www.eskridgeinc.com
Model 312 spindle-shaft service manual, SM312S2-AA
Page 5
4) If equipped with metal-face-type seal (16D), the adapter (16F)
with o-ring seal (16E) may be left on if this was not leaking.
If you suspect leaks of this component, remove the adapter
(16F) by using a thin chisel to begin moving it up from the seat-
ed position and remove as it clears the seal diameter boss of
the shaft (2). Remove and replace the o-ring (16E). Re-install
the adapter (16F) with lubricated o-ring (16E) in place.
6) Lubricate inner lip of new shaft seal (16A) (if equipped) and
slide it onto the shaft (2) until it fits snugly over the shaft seal
diameter with the open side toward the inside of the gear drive.
If equipped with metal-face-type seal (16D), insert each half
of the seal in its respective cavity with lapped metal face fac-
ing the proper direction (lapped metal faces are to be touching
each other for proper operation).
Note: Press bearing cone onto output shaft by pressing on in-
ner race only. DO NOT press on roller cage, as it will damage
bearing.
6) Inspect inner and outer bearing cups (20D & 20B). If cups are
damaged, drive them out using a brass drift and press new
cups into place using an acceptable press tool that will not
damage the cups (20B, 20D).
Base Reassembly
1) Clean all foreign material from any magnetic oil plug (30B) lo-
cated on base (1).
2) Place spindle-shaft (2) spline-end up on work table. Using a
press tool that presses only on the cone race, press outer bear-
ing cone (20A) onto shaft (2) until it seats against the shoulder.
3) Place base (1) exterior side up on work table.
4) Apply a layer of lithium or general purpose bearing grease to
the roller contact surface of outer bearing cup (20B). Install the
rubber dirt boot (16C) onto base if equipped.
5) Place the shaft (2) with lip-seal (16A) if equipped and bearing
cone (20A) on press work table (spline pointing up). Apply a
thin layer of purple Loctite (545) or equivalent on OD of lip-seal
(16A) if equipped.
6) Place the base (1) with the metal-face-type seal (16D) if
equipped over the shaft (2) with the bearing (20A) and seal
(16A) or (16D, 16E, 16F). Use 4-5 spacers between the spin-
dle flange and lip seal (16A) to force the seal into the bore of
the base (1). Press on the base (1) to install the lip seal (16A).
7) Apply lithium or general purpose bearing grease to roll-
er contact surface of the inner cup (20D) then press
inner bearing cone (20C) onto shaft (2) until it seats against
inner bearing cup (20D).
8)
The bearing preload should be adjusted to
achieve rolling torque in the range of between
100 to 400 in-lb. The bearing preload should be
tailored to your application; a low-speed application may
require a high pre-load, while high-speed applications
usually requires low pre-load. Adding shims (35A) will in-
crease the pre-load on the bearing set. Determine your
pre-load requirement and install shims (35A) to obtain
this pre-load.
Install the Load-N-Lock™ segments (35B) over the shims
(35A) and into the groove in the shaft (2). Finally, install the
lock ring (35C) over the segments (35B).
All subassembly service or repairs should be complete at
this time. Continue to Unit Assembly to complete unit build-
up.
Unit Reassembly
1) Install the secondary carrier (5) assembly onto the output
shaft (2); align the splines of the carrier (5A) with the out-
put shaft (2) splines and slide the carrier onto the shaft.
2) Lubricate o-ring (16B) and install on the external pilot of
the secondary ring gear (12B).
Caution: Hold ring gear(s) by outside diameter or use lifting
device to prevent injury.
3) Align gear teeth of secondary ring gear (12B) with the gear
teeth of the planet gears (5B) and then align bolt holes
(also use the scribe-mark made during disassembly).
4) Lubricate o-ring (16B) and install on the external pilot of
the primary ring gear (12A).
5) Install the sun gear (6) into the mesh of the secondary car-
rier assembly (5) and install the thrust washer (14B).
6) Align the planet gear (7B) teeth with the teeth of the prima-
ry ring gear (12A) and install the carrier, aligning the spline
teeth of the carrier with the splines of the sun gear (6).
7) Install the thrust washer (14B) onto the primary carrier as-
sembly (7).
8) Install the input gear (4).
6) Install the thrust washer (14A).Refer to exploded view for
details..
7) Noting the scribed line made during disassembly, (with lu-
bricated o-ring (16B) in place) align and install the cover
(3).
8) Install and torque the twenty 5/8-11 hex-head cap-
screws (25A) with lockwashers (25G). The torque for the
cap-screws: 220 ft-lb dry, 170 ft-lb if the fasteners are
lubricated.
9) Using a splined shaft to drive the input gear (4) ensure that
the unit spins freely.
10) Install all plugs (30A, 30B, 30C). Fill the unit to the prop-
er level, as specified, with recommended gear oil (refer to
chart, page 3) after unit is sealed with brake and/or motor.
The gearbox is now ready to use.