Dodge SCXT 225 User manual

1
WARNING: To ensure the drive is not unexpectedly
started, turn off and lock-out or tag power source before
proceeding. Failure to observe these precautions could
result in bodily injury.
WARNING: All products over 25 kg (55 lbs) are noted on the
shipping package. Proper lifting practices are required for
these products.
WARNING: Because of the possible danger to person(s)
or property from accidents which may result from the
improper use of products, it is important that correct
procedures be followed. Products must be used in
accordance with the engineering information specified
in the catalog. Proper installation, maintenance and
operation procedures must be observed. The instructions
in the instruction manuals must be followed. Inspections
should be made as necessary to assure safe operation
under prevailing conditions. Proper guards and other
suitable safety devices or procedures as may be
desirable or as may be specified in safety codes should
be provided, and are neither provided by Dodge nor are
the responsibility of Dodge. This unit and its associated
equipment must be installed, adjusted and maintained by
qualified personnel who are familiar with the construction
and operation of all equipment in the system and the
potential hazards involved. When risk to persons or
property may be involved, a holding device must be an
integral part of the driven equipment beyond the speed
reducer output shaft.
Instruction Manual For Dodge®MIMA Wrapper
SCXT 225 Speed Reducer
These instructions must be read thoroughly before installation or operation. This instruction manual was accurate at the time of
printing. Please see dodgeindustrial.com for updated instruction manuals.
WARNING: Equipment being removed may be too heavy to
control manually. Support it by external means. Failure to
observe these precautions could result in bodily injury.
P
P
P
D
MIMA Mounting Position
Guidelines for Torque-Arm Reducer
Long-Term Storage
During periods of long storage, or when waiting for delivery or
installation of other equipment, special care should be taken
to protect a gear reducer to have it ready to be in the best
condition when placed in service.
By taking special precautions, problems such as seal leakage
and reducer failure due to the lack of lubrication, improper
lubrication quantity, or contamination can be avoided. The
following precautions will protect gear reducers during periods
of extended storage:
Preparation
1. Drain the oil from the unit. Add a vapor phase corrosion
inhibiting oil (VCI-105 oil by Daubert Chemical Co.) in
accordance with Table 4.
2. Seal the unit air tight.
3. Cover the shaft extension with a waxy rust preventative
compound that will keep oxygen away from the bare metal.
(Non-Rust X-110 by Daubert Chemical Co.)
4. The instruction manuals and lubrication tags are paper
and must be kept dry. Either remove these documents
and store them inside or cover the unit with a durable
waterproof cover which will keep moisture away.
5. Protect the reducer from dust, moisture, and other
contaminants by storing the unit in a dry area.
6. In a damp environment, the reducer should be packed
inside a moisture-proof container or an envelope of
polyethylene containing a desiccant material. If the reducer
is to be stored outdoors, cover the entire exterior with a
rust preventative.
When Placing the Reducer into Service
1. Clean the shaft extensions with petroleum solvents.
2. Fill the unit to the proper oil level using a recommended
lubricant. The VCI oil will not affect the new lubricant.
3. Follow the installation instructions provided in this manual.

2
Lubrication
SCXT225MIMA Reducer is shipped with approximately 2 quarts
of Mobil SHC 634 ISO 460 VG.
Table 1- Quantities of VCI #105 Oil
Dodge Part Number 415112-80-DB
Case Size Quarts or Liters
SCXT2 .2 QTS.
VCI #105 & #10 are interchangeable.
VCI #105 is more readily available.
Replacement Parts
Using an arbor press, equipment for heating and shrinking
bearings and gears on shafts, and the tools normally found in
a maintenance department, the MIMA SCXT225 speed reducer
can easily be disassembled and reassembled by careful
attention to the following instructions.
Cleanliness is very important to prevent the introduction of
dirt into the bearings and other parts of the reducer. The oil
seals are of the rubbing type and considerable care should be
exercised during disassembly or reassembly to avoid damage
to the surfaces on which the seals rub. Any sharp edges on the
input shaft or output hub should be covered with adhesive tape
or paper before performing any work on the unit. Nicks and
burrs on surfaces of the input shaft or output hub should be
removed.
Ordering Parts
When ordering parts, specify SCXT225 MIMA and part number,
part name, and quantity. Parts that must be pressed from
shafts or output hub should be removed before ordering parts.
This assures that those parts, if damaged during pressing
operation, will be replaced.
It is recommended that when a pinion or gear is replaced, its
mating gear or pinion be replaced also. This ensures that the
gear teeth will mesh properly. If the large gear on the output hub
must be replaced, it is suggested that an output hub assembly,
consisting of a gear assembled on an output hub, be ordered
to secure an output hub with undamaged surfaces on which
the oil seals rub. However, if the old output hub is to be used,
carefully press the gear and bearing cones off. Thoroughly
examine the area under the oil seals for scratches or any other
damage resulting from the pressing operation. To prevent oil
leakage at the oil seals, the rubbing area must be smooth.
Replacements for the old oil seals should be ordered, due to the
probability of these parts being damaged during disassembly.
If replacing a bearing, output hub or a shaft, it is advisable to
order a set of shims for adjustment of bearings on the shaft
assembly. If replacing a housing, a set of shims should be
ordered for each shaft assembly because the adjustment of
bearings on each shaft assembly is affected.
Disconnect any electrical power to the drive. Drain lubricant
from reducer. Uncouple drive shaft and screw. Remove nuts
from trough end studs. Support drive by means of hoist and
carefully pull unit away from trough end to slide drive shaft out
of screw.
Disassembly:
1. Position reducer on its side and remove bolts. Gently tap
the output hub and input shaft with a soft hammer (rawhide
not a lead hammer) to separate the housing halves. Open
housing evenly to prevent damage to the parts inside
2. Lift shaft, gear and bearing assemblies from housing.
3. Remove seals, seal carriers and bearing cups from
housing.
4. Clean all parts in solvent, inspect for damage and coat with
oil.
WARNING: Solvents can be toxic and/or flammable. Follow
manufacturer's safety procedures and directions. Failure
to observe these precautions could result in bodily injury.
Reassembly:
1. Output Hub Assembly: Heat gear to 325° to 350°F for
shrinking onto output hub. Heat bearing cones to 250° to
270°F for shrinking onto output hub.
2. Countershaft Assembly: Heat gear to 325° to 350°F and
bearing cones to 250° to 270°F for shrinking onto shaft.
3. Input Shaft Assembly: Shaft and pinion are integral. Heat
bearing cones to 250° to 270°F for shrinking onto shaft.
4. Drive the dowel pins back into position in the right hand
housing half.
5. Install countershaft and input bearing cover in right-hand
housing half. Place housing half on blocks to allow for
protruding end of output hub. Install bearing cups in right-
hand housing half making sure they are properly seated
(output only).
6. Mesh output hub gear and small countershaft gear together
and set in place in housing. Set input shaft assembly in
place in the housing. Make sure bearing rollers (cones) are
properly seated in their cups (output only).
7. Clean housing ange surfaces on both halves, making
sure not to nick or scratch ange face. Place a new bead
of gasket eliminator on ange face and spread evenly over
entire ange leaving no bare spots. If too much sealant is
used, it will run into the bearing, and too little sealant will
result in an ineffective seal. Place other housing half into
position and tap with a soft hammer (rawhide not lead
hammer) until housing bolts can be used or draw housing
halves together. Torque housing bolts to 550-600 in.-lb.
Place output hub seal carrier in position. Shim and torque
bolts per special instructions attached.
Apply RTV to all SCAL O.D.'s.
8. Extreme care should be used when installing seals to avoid
damage due to contact with any sharp edges on the input
shaft or output hub. Possibility of damage and consequent
oil leakage can be decreased by covering all sharp edges
with tape or paper prior to seal installation. Fill cavity
between seal-lips with grease. Seals should be pressed or
tapped with a soft hammer evenly into place in the carrier
applying pressure only on the outer edge of the seals. A
slight oil leakage at the seals may be evident during initial
running in but should disappear unless seals have been
damaged.
9. Fill with approximately 2 quarts of Mobil SHC 634 oil, ISO
460 VG.

3
Modified Assembly Procedure:
SCXT225 MIMA/ITW (Wrapper Units)
1. All assembly procedures for standard SCXT225 should be
followed except for the following changes in shimming of
output bearing.
2. New output bearing shimming procedures:
a. Place output bearing cup in left half of housing.
Ensure the bearing cup is correctly seated.
b. Position output hub seal carrier (without shims) and
install two carrier screws diametrically opposed.
c. Torque each screw to 50 in.-lb. Rotate the output hub to
roll in the bearings, then torque each screw to 100 in.-
lb. Rotate the output hub again to roll in the bearings.
d. Seat output bearings by tapping the seal carrier with
a hammer; turning the output hub again to further
roll in the bearings. Torque carrier bolts again to 100
in.-lb. Repeat this process of hammering, turning the
output hub, and torquing to 100 in.-lb. until bearings
are completely seated (3-4 seatings may be required).
e. With a feeler or taper gauge, measure the gap between
the housing and the carrier, clockwise from and next to
each screw.
f. To determine the required shim pack thickness,
subtract 0.010 in. from the average of the two gauge
readings (Pack Thickness = Gauge Average - 0.010 in.)
g. Remove the output hub seal carrier and install the
required shims (shim pack thickness should be
inspected with a 0-1” micrometer). Note: Total shim
thickness per carrier should not include more than
0.009” plastic shims. All other shims should be metal,
and each plastic shim should be inserted between two
metal shims.
h. Continue with normal assembly procedure from this
point. (Carrier bolt torque should be 360 in.-lb.)
Table 2 — Manufacturers' Part Numbers for Replacements
Input Shaft Bearings
Screw
Conveyor
Drive
Size
SCXT225
Input Shaft Bearing
Input Side
Input Shaft Bearing
Adapter Side
DODGE
Part Number
NSK
Part Number
DODGE
Part Number
NSK
Part Number
392078 BL206 392075 6305
Countershaft Bearings
Countershaft Bearing
Input Side
Countershaft Bearing
Adapter Side
DODGE
Part Number
NSK
Part Number
DODGE
Part Number
NSK
Part Number
392075 BL305 392075 BL305
Output Hub Bearing
DODGE Part Number New Departure Number
Cone Cup Cone Cup
390812 390816 JLM710949 JLM710910

Dodge Industrial, Inc.
1061 Holland Road
Simpsonville, SC 29681
[phone]
All Rights Reserved. Printed in USA.
MN1668 02/22
*1668-0222*
© DODGE INDUSTRIAL, INC.
AN RBC BEARINGS COMPANY
Parts for
MIMA SCXT225 Speed Reducers
Reference Name of Part Number
Required Part No.
1HOUSING 1D6653
1A Housing Gasket ①1242219
2Housing Bolt 7411724
3Washer 14 419199
4Hex Nut 7407285
5 Dowel Pin 2 420091
②Pipe Plug 5430031
②Magnetic Drain Plug 1430060
6 Countershaft Bearing Cover – Input Side 1 242212
7 Input Shaft Bearing Cover (Backstop Side) 1 354112
8 Input Shaft and Pinion 25:1 Ratio 1 242187
9 Input Shaft Key 1 443013
11 Input Shaft Bearing – Input Side ③1424019
12 Input Shaft Bearing – Adapter Side ③1424090
COUNTERSHAFT ASSEMBLY 25:1 Ratio ④1392093
13 ⑤Countershaft and Pinion 1242185
14 ⑤First Reduction Gear 25:1 Ratio 1 242005
15 ⑤Gear Key 1242218
16 Countershaft Bearing – Input Side ③⑥1424000
17 Countershaft Bearing – Adapter Side ③1424000
OUTPUT HUB ASSEMBLY ④1392105
18 ⑤Output Hub 1352112
19 ⑤Output Hub Gear 1242181
20 ⑤Output Hub Gear Key ⑦1443399
21 ⑤Snap Ring 1 421017
22 Output Hub Seal Carrier 1C15035
23 Carrier Screw 4411407
24 Carrier Screw 4A38868
25 Lockwasher 4419011
27 Output Hub Bearing – Cone ③2490812
28 Output Hub Bearing – Cup ③2390816
29 Output Hub Shim Pack 1 Set ⑧391059
30 Output Shaft Key
SEAL KIT ④1272712
10 ⑤Input Seal 1 242211
Rubber
26 ⑤Output Hub Seal 2352113
Steel
① Apply A73012 Pertmatex Form "A" Gasket 1B to both sides of housing flange with
gasket
② Not shown on drawing
③ For manufacturers' part number see Table 2.
④ Recommended spare parts. Includes parts listed immediately below. Housing
Assembly also includes two-piece housing
⑤ These parts make up the assemblies under which they are listed.
⑥
⑦
⑧ One set consist of one each of the shims listed immediately below
15
3
4
2
19
20
18
21
26
27
28
15
13
7
7
17
14
8
7
12
1A
242219
A73012
10
11
9
6
16
27
28
30
29
25
23
22
26